NL8802457A - DIAGNOSTIC DEVICE FOR A HOT WATER RESERVOIR. - Google Patents

Abstract

An integrated diagnostic module is connected as an integrated part of a hot water heating unit. The module has a circuit board with an electrically isolated power supply and sensing leads connected to sensors in the operating system and coupled to components of the hot water heating unit. The diagnostic module has a visual display and descriptive panel 37 secured to the circuit board as a part of one wall of the housing. The display panel has a vertical row of LEDs 78-87 in a operating display section 42 and a vertical row of LEDs 90-95 in a malfunction display section 43 to the opposite sides of a heater illustration 77. The panel carries indicia to form a descriptive display of the operational status and of the state of the components. Each system state and component is provided with a suitable sensor having a switch connected in the circuit, and connecting the LED of an opto-isolator which includes a transistor turned on by the LED. Each transistor is connected with one of the LEDs units, and selected transistors are connected in an interrelated logic whereby two different conditions control one of more LEDs. The operating section includes a "standby" LED 80 and a "heat" LED 81. A pump display includes a "pump-on" LED 82 and a "cool-down" LED 83. An ignitor LED 84 and a series of three or more burner LEDs 85-87 provide information as to the state of the burner. The malfunction section includes a water flow LED 92, a temperature LED 93, a low gas pressure LED 94 and a restricted gas flow LED 95. Flue LEDs 90, 91 can be provided to monitor a blocked flue or excessive CO in the flue gases. <IMAGE>

Description

*

88307 / vA

Short designation: Diagnostic device for a hot water reservoir.

Background to the invention

The invention relates to a diagnostic device for a hot water reservoir and in particular to an integrated module unit which can be mounted on the hot water reservoir and contains an operating part, with which the normal operation of the hot water reservoir is monitored and described, as well as a fault part, with which a malfunction of one or more parts of the hot water reservoir is detected with an integrated description of the various parameters on an illuminated descriptive panel.

10 Industrial hot water tanks can operate under different load conditions and generally require periodic monitoring of proper operation. The hot water reservoir can be a separate storage unit with an internal heating unit. Gas-fired heaters are desirable because of the rapid heating of the water during a heating cycle. The hot water reservoir also supplies hot water as required or is connected to a pump with one or more separate storage units, with which the water is fed through the heating coil into the heating unit 20 and the storage unit. Upon termination of a heating cycle in a heating system with separate storage tanks or in a need system, the pump unit continues to pump the water to establish a heat balance in the hot water system, which is identified with a cooling period.

Different controls are normally present in a system. The controls include various energy devices, thermostats for monitoring and controlling the temperature level of the water, ignition devices for operating the heating unit, a throttle control, which sets a high or low heating condition, as well as a pump control for circulation and cooling cycles. Various faults can occur during system operation, all of which directly affect the desired or necessary operation of the unit. In order to efficiently heat the water in the system including the storage system, an adequate water flow must be established and maintained. Furthermore, the circulation and heating coil unit in heaters with coils must be protected against too high a temperature. The burner must be supplied with the correct amount of gas. A limited gas flow to the burner results in the heating unit operating inefficiently and incorrectly. The burner 10 can be fired in a number of stages for a different heat supply to the water during the heating cycle. These and similar functions and operating devices are currently controlled manually and monitored by an operator. Observation devices mounted on a part with an output reading unit are provided for monitoring some factors and components. A thermostat may, for example, have a reading screen on the outside, a flow meter can be arranged in the circulation pipe with a dial for the flow rate, with which the flow can be read. Recently, the free flow of flue gases from the heating unit has taken on some significance. When the flue gases contain too much carbon monoxide, there is further danger to living things and it may be desirable, if not necessary, to monitor the condition and condition of the flue gases. Certain individual elements can therefore provide an output from which other functions and / or disturbances can be derived.

Although such systems have been satisfactorily developed and applied in industry, the requirement that an operator monitor and continuously or periodically check the various systems and components is relatively expensive, but the monitoring is essentially the operator's depending on the person and the results are therefore directly related to the care and proper attention of the maintenance and operating personnel.

Obviously, this is an additional source of failures or unobserved errors.

Summary of the invention.

, 8602457 -3-

The invention is particularly directed to an integrated diaognostic module, which forms an integrated part of a hot water reservoir unit. According to the invention, the integrated diagnostic module is an electrical monitoring system with an electrically insulated connection to the operating system and parts of the hot water reservoir and the module comprises a number of means which are linked to and monitor the various functions and parts of the heating system to provide a continuous indication on 1D, a descriptive display of the state of the system and failure of the specially monitored components. The condition and malfunction information is displayed on a suitable display, which is directly connected to the heating unit, so that the operating and maintenance personnel on site obtain information regarding a malfunction of a part and the operating condition of the heating unit at the time when the failure occurs.

The reading screen is provided with separate parts for displaying information regarding the condition or about a fault, respectively. This provides an immediate and continuous display of the system status, which is continuously available to the operating and maintenance personnel.

More particularly, according to the invention and in a suitable embodiment, the various operating and control components are preferably arranged in a concentrated area or part of the hot water reservoir tank in accordance with a generally known construction. The operating and control components are generally connected to a 115 volt AC power source, as is commonly used in the United States, and which powers and drives the system. An outer jacket is placed over the control components to insulate and protect them during periods of necessary attention and maintenance.

According to the invention, a diagnostic module is provided with a visual reading screen and descriptive panel or unit.

The panel of the screen is provided in the operating portion of a bundle of elements for displaying the functions, and in the other or stuttering portion with a bundle of elements for displaying the condition of components. The elements of the screen are preferably low voltage lamps, such as LEDs, crystal screens or other similar indicators. The 5 screen elements are mounted on a circuit board as part of the screen unit and are visible through a separate screen panel. The panel is appropriately labeled to provide a descriptive representation of the operation and condition of several individual essential 1D or major components. An isolated electrical sensing and screen driving unit is provided, preferably as a separate electronic package or unit, with circuit inputs coupled to the electrical output of the sensing units and suitable outputs being connected to the various visual screen elements via logic circuitry while an energy input is connected via a stepped lowered isolation unit to the incoming main energy source, for example the 150 volt source. The isolated circuit includes means for electrically isolating 2D and reducing the voltage from the main voltage of 115 volts to a low voltage with a suitable low voltage AC source for operating the monitoring system and a suitable low voltage DC source for the display units with electrical insulation from the supply under high voltage. The electronic unit includes a plurality of drive side sensors with low voltage alternating current input, which is connected to the control and operating circuitry to provide an isolated low voltage signal. The output of each sensor is 3D-switched in such a way that the individual elements of the display are operated, which are connected either directly or by a combined logic circuit to certain other components. Each sensor is connected to the circuit of the shield elements via an electrical insulator to separate the monitoring module from the heater control circuit to ensure that the control circuit operates without being affected by the module circuit .

8802457 -5-

The isolated diagnostic module is therefore very well suited for providing a remote image, monitoring a number of heaters, operating alarm circuits and the like.

The panel and the integrated electronic unit is preferably arranged in the control box or jacket of the heating unit. The screen unit preferably includes a cabinet circuit and lamp plate and an outer cover panel that closes the cabinet. A simple plug-in connector element connects an electronic package on the circuit board to various low voltage power and signal lines. The display unit has only low voltage inputs and can also be located adjacent to the heater and connected via a low voltage connection cable to the power units for controlling the heater. The screen unit is connected to the control jacket, which has an opening in the wall at the front, leaving the panel exposed. The display units may be connected to a remote display panel and / or editing system with a suitable cable, continuously displaying the state of the system and components. Various factors, such as operating cycles, operating time and the like information and control factors can also be analyzed as a result of system monitoring.

In a suitable construction, each monitored system and / or component is provided with a suitable sensor element with a switch or other energy level control element incorporated in the control circuit and operable so that a change in the circuit 30 arises. The sensor is connected to an optoisolator switching unit containing a light source connected in series with the sensor. The opto-isolator includes a semiconductor switching element which is optically coupled to the light source to provide a binary or on / off signal in the low voltage display circuit. Each switching element of the optoisolator is connected in series with one of the light units, and certain switching elements are included in an interconnected logic circuit, two different conditions controlling one or more lamp units. In a suitable construction, each opto-isolator switch is a semiconductor switching element connected directly in series with a suitable current-limiting mode with the associated lamp, which is preferably an LED (light-emitting diode), which has a DC voltage of six volts is connected. The switch is connected in series or in parallel with the lamp, depending on the logic control circuit.

When heat is required, a thermo-10 operates a switching unit to energize the light unit for this opto-isolator, which then turns on the semiconductor switch to turn off a "standby" light and turn on a "heating" light. to switch. At the same time, switches are operated to turn on a heat balance or "pump-15 on" light and turn on various burner condition lights. This change from "standby" in a "heating" cycle as a result of energizing the differing respective LED units is thereby visualized. In addition, separate circuits and LEDs are provided for monitoring the water flow due to the operation of the pump unit. Just like a branch for the upper limit of the spiral, the temperature of the spiral is monitored and when the temperature rises above a certain level, the corresponding lamp comes on. Certain commercial hot water reservoirs contain 25 excess heating units, where a larger hot water supply is essential. Such superfluous units are monitored with separate branches. Similar branch circuits are provided for monitoring low gas pressure and limited gas flow in each burner. A series of lamps coupled to the burner monitors and indicates the state of the gas ignition control unit, while a two-stage burner monitors and indicates a low-level burner input and a high-level burner input. In addition, further branch circuits 35 may be provided for a blocked or blocked flue gas condition and a condition with an excess of CO in the flue gases in each unit.

A suitable embodiment of the invention consists of a standard or universal screen connection circuit and display module with different control switches for selectively supplying energy to the different screen circuits via the separate opto-isolators. The 5 LED screen board contains branch circuits for all heaters in a given line as well as a series of expansion branch circuits. The board is also designed with the appropriate structure for various commercially available components. Opto-isolators are available, which respond to both half cycles of an AC power source. However, other opto-isolators respond to only half a cycle. The latter devices must be provided with a protective diode and the like. Such a change can be made in the base board. The universal module is therefore designed such that the module can be fitted to any of the different hot water reservoirs of the manufacturer's range of hot water reservoirs. The circuit of the module is then connected to the sensors for the special hot water reservoir with a separate screen cover for the screen-20 panel.

The invention provides an improved system and device for monitoring a commercial hot water reservoir system. The display module provides a complete picture of the state of operation of the device as well as the state of the operating components in the event of a malfunction of the device.

Brief description of the drawing.

The accompanying drawing shows the mode which is currently considered by the invention to be the best mode for practicing the invention and is described below.

Fig. 1 is a view of a commercial hot water reservoir with a descriptive display panel according to an embodiment of the invention, FIG. 2 is a partial view of the hot water reservoir, showing a portion of an outer cover 8802457

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-8- is counted away and certain construction details are shown, Fig. 2a is an enlarged sectional view of the construction and mounting of a display panel,

Fig. 3 is an enlarged plan view of the descriptive display panel shown in FIG. 1,

Fig. 4 shows a wiring diagram of an operating circuit with certain control elements for energizing the descriptive display panel shown in FIG. 3, and

Fig. 5 shows a schematic circuit diagram of the monitoring control and driving circuit for the cable gating panel unit shown in FIGS. 1 to 4.

Description of the shown embodiment.

Referring particularly to Figure 1, the present invention has been shown with a typical hot water heating system with a hot water reservoir 1 connected to a separate storage unit 2. A pump 3 pumps water between the reservoir 1 and the storage unit 2 to establish a common temperature of the water in the system. The hot water reservoir 1 is a typical device and comprises a vertically placed cylindrical construction with an inner hot water coil 4 within an outer decorative cover 5. A burner unit 6 is located under the coil 7 and is connected via an throttle control construction 7 to an incoming gas pipe 8. An inlet pipe 9 supplies cold water from a source of use and the like. The hot water race reservoir 1 contains a heating coil 4 through which the cold water flows and is heated by hot gases 2 of the burner unit B. A central flue gas duct 11 runs from the hot water reservoir 1 upwards and ends 30 in a flue connection 12 according to the usual practice. An elongated rectangular cover box 13 is attached to a side wall panel, which is mounted on the tank of the reservoir and extends over a substantial portion of the hot water reservoir near a gas burner control valve assembly 35 7. Different controls TB are mounted in the box 13 and with the different actuators connected to the unit. The rectangular box 13 is a generally U-8802457 4-shaped element with an edge flange 14 for attachment to the jacket. The cabinet can be easily removed, so that the different components are exposed. Generally, the controls include various means for monitoring and controlling the operation of the system. Typically, a thermostat or other temperature control unit 17 is attached to the coil 4 in the box 13 near the top of the coil 4. The thermostat unit 17 is generally a dual sensor unit, one of which is set at an upper temperature limit and the other at a lower limit to establish a temperature range and monitor the temperature of the water. Suitable control switches are operated by the sensors 17 as well as other component sensors, which are described in the embodiment shown, and with which the burner valve construction 17 can be controlled. The sensor 17 as well as the other sensors are known devices and a special unit is not shown or described.

Temperature control selectors 17 and 17a are provided to set the desired water temperature limits. The control typically sets a temperature range, for example 160 ° to 180 ° F. The limits are normally set at the factory to a specified number of degrees above the maximum water temperature to avoid 25 hours of hot water reservoirs with dangerously high water temperatures .

A high temperature limiting switch 18 is mounted on the coil to turn off the burner when the temperature of the coil is too high.

In accordance with conventional practice, switch 18 preferably includes a manual adjustment knob for resetting the switch, which is only necessary when the temperature has fallen below the minimum setting of the system.

According to the drawing, two sensors 20 and 21 are arranged in the discharge end of the flue gas channel T1. One sensor 20 forms a flow sensor and monitors the flow of the exhaust gases 28 when the burner is in operation. A fall in the exhaust gas flow below a certain level indicates that a blockage occurs in the flue gas channel. This could cause an ineffective and even dangerous circumstance. The second sensor is a carbon monoxide (CO) sensor, 5 which is also mounted in the upper end of the channel 11 to monitor the exhaust gas content and in particular the carbon monoxide content in the exhaust gases 22. Too much carbon monoxide can be used for humans and other living creatures cause a dangerous condition. The CO level is therefore monitored 10.

A gas pressure sensor 23 is attached to a pressure connection to a main gas valve 24 of the structure 7 in the gas line 8 and establishes an output for the display system when the pressure drops below an acceptable minimum level 15.

A gas flow sensor 25 is connected to the outlet side of the valve structure 7 to ensure a minimum gas pressure for the burner 8 when the hot water reservoir is in a heating cycle. The fault may be a faulty 2G or clogged valve, an inoperative control element, or a faulty closing of a manual main gas valve 24.

A water flow sensor 28 is connected to the outgoing pipe 27 of the hot water reservoir 1 and produces an output signal when the water flow drops below a selected level.

These are typical functions and components that can be monitored in the embodiment shown.

The various control valves and actuator switches 3D for operating the hot water reservoir are controlled by a low voltage operating circuit. In the present invention, the operating circuit includes a plurality of switching and control units, which are connected to the various sensors and thereby operated to monitor the operating state and operating conditions of.

the hot water reservoir and also for monitoring various critical components. The monitoring signals are passed to a driving circuit of a descriptive display unit 35, which is mounted in the case 13, to provide a descriptive output of normal operation as well as the failure of a critical component. The descriptive output is presented as two separate series 5 lamps 3G in a display panel 37. The display unit 35 is located in the control shroud 13, with the panel 37 exposed through an outer opening for a visual observation of the information related to the condition of the hot water reservoir 1. In general, the unit 35 comprises a separate electronic circuit board 38, which is arranged behind the panel 37. A plug connector 39 connects the plate 40 to an incoming power and signal cable 41 for selectively energizing the low voltage display lamps 36. The low power and signal cable supplies power to the display unit 35 and the connection of the display unit. display circuit with the various sensors in the system to establish the respective input signals for the display drive circuit. Generally, the display panel 37 includes an operating section 42, where the display lamps 36 describe the operating state of the hot water reservoir, such as a standby mode, a heating mode, and a cooling mode. Panel 37 also includes a fault section 43 with a separate series of lamps 36 for causing a fault in selected critical components or functions.

Referring in particular to Figure 2a, the display unit 35 includes a narrow, rectangular, saucer-shaped cabinet 44. The base portion of a generally U-shaped console 45 is attached to the bottom or rear wall of the cabinet. The legs of the U-shaped console are L-shaped with mounting flanges that rest against the hot water reservoir and are releasably attached thereto to support the cabinet remotely within the outer wall of the cabinet or lid 23. The plate 40 with the lamp circuit fits into a recessed or offset lip of the box 44, the lamps 36 protruding from the outer surface. The cover panel 8802457-12 12 is fastened over the plate 40 with screws 46 in the corners connecting the panel and the circuit board to the box 44. The outer casing has an opening aligned with the panel, with an edge sealing element 47 fitted around the edge of the opening of the cabinet and protruding inwardly and abutting the panel 37 for a clear view of the provide the slightly recessed panel. A control structure, such as a main transformer unit, a cooling control unit and the like, are provided on the front of the casing 5. Suitable low voltage cables 4§ to the cable 41 for interconnection with the plug-in connecting element 39 and thereby with the electronic circuit board 40 of the display unit 35. The connections of the circuits are shown in the schematic circuit diagram shown in FIGS. 5 has been shown, described and explained. The mounting of the display unit 35 as an integral part of the hot water reservoir provides a particularly convenient and effective descriptive display for the operating and maintenance personnel. If for some reason the integrated mounting in the hot water reservoir is considered undesirable due to temperature conditions and the like, the display unit can be easily located in an area in the immediate vicinity with a suitable low voltage connection cable 41 to the display unit.

The operating circuit for the hot water reservoir is generally a known standard circuit and is briefly described for displaying the background and basis for interconnection of the various functions associated with the display and the indications of the state, as generally provided by the descriptive display unit 35 and the descriptive reading screen or panel 37.

Referring to the drawing and in particular to Fig. 4, the operating circuit is a typical control for a hot water reservoir, which as shown with a conventional 115 volt power supply line 50 8802457 -13-; connected in series with a single-stroke, double-pole switch 51 for simultaneously making and breaking the connection to the main power source. The main power lines 50 are directly connected to a control transformer relays 52 and 5 to a thermal balance or cooling control unit 53.

The unit 53 is mounted on the control plate at the front of the hot water reservoir within the jacket 13, as shown in Fig. 2. A master thermostat requirement switch 55 is connected as an input controller to transformer relay 52. The thermostat may be located in the storage unit or other end-use location that operates switch 55. When the thermostat switch 55 closes, the transformer relay 52 is energized and supplies the output energy for the heat balance or cooling unit 53 and for a controlling control transformer 56. The output of the heat balance unit 53 supplies energy to the pump 3 simultaneously with the need for heat to circulate the water.

Just before the burner 6 is ignited, the pump 3 is driven so that the water circulates and is heated.

The heat balancing unit 53 includes a lock through the direct connection 57 of the power line to keep the pump 3 operating after the thermostat switch 55 opens and a further need for heat is eliminated to accomplish and maintain the cooling cycle. Units 52 and 53 may be of some known or desired construction, and since such systems and devices are known, they are not described otherwise, except for the indication that the switch is connected to an input of the monitoring circuit and this input, as described below.

When the pump 3 starts to circulate the water, a latch flow switch 58 is closed. The current switch 58 is connected between the output of the transformer relay 35 52 and the alternating current transformer 56.

When the switch 58 is closed, energy is supplied to the burner operation and control circuit BQ to ignite the heating burner 6.

The winding transformer 56 converts the 115 volt power supply into a 24 volt alternating current power supply suitable for operating the various controls and solenoid valves of the heater control circuit.

In the embodiment of the invention shown, the output of the low voltage transformer 56 is connected to the burner control system through the high / low temperature level thermostat unit 17, which consists of a switch 62 for the high level and a switch 63 for the low level .

The high level switch 62 is connected between one side of the secondary winding of the lowering transformer 56 and the main power connection to an ignition module 64 of the heating control. The high level switch 62 is normally closed to operate the heater in response to a need for water and reacts to the maximum temperature level of the water to shut down the burner 6. The connection of the high level switch 62 to the control is in series with a plurality of sensor latch switches 65, each of which can open and effectively turn off the heater. The switches 65 each form part of a sensor described above and coupled such that a critical or desired control or operating component is monitored, as described below.

The low temperature level switch 63 is connected between the level switch 62 and a high burner gas flow rate solenoid valve 66. Switch 63 is also normally closed and responds to a minimum temperature level to control a two-stage burner. In the representation of the system, the electromagnetic valves are shown schematically, the coil winding being included in the circuit, which is referred to as the valve unit.

In particular, when the high level switch is closed, the current is supplied under 24 volts to the ignition module 64, providing energy * 8002457 -15- to engage the pilot burner assembly 67, while also providing output energy for an electromagnetic control valve 68 is supplied. The ignition module 64 includes an internal power connection for actuating a pilot burner igniter 70, the pilot gas valve 58, and a low gas flow main valve 69. The pilot burner ignitor 70 also senses the presence of the flame. The igniter 70 is a high voltage spark ignition unit which operates to illuminate the control structure 67. The control gas valve 68 10 connects the control burner 69 to the gas supply pipe 8 and the main gas flow valve 69 connects the main burner to the gas supply pipe 8 to supply a relatively small amount of gas. The actuation of the module 64 therefore provides for the generation of the spark 15 to generate the control flame 71 and to ignite the burner. Ignition 70 detects the control flame and allows opening of the throttle valves by energizing the electromagnetic valves 66 and 69.

The low combustion switch unit 63 is connected between the high burn switch 62 and one side of the main electromagnetic valve 66 for a strong gas flow. The discharge side of the valves 66, 68 and 69 are jointly connected to an output terminal of the ignition module 64.

The high / low sense switches 62 and 66 therefore selectively energize the main burner in a low combustion phase or a high combustion phase. Both valves are opened to operate the burner 6 in a maximum heating mode, which is brought about at 3Q the temperature below the minimum heating level. When the temperature of the water rises above the minimum heating level, the switch 63 opens, the coil 66 is de-energized and the relevant valve is closed. The heater continues to operate with the low gas supply provided by the electromagnetic valve 69. When the temperature of the water rises to the upper limit, the switch 62 opens and the heater is turned off.

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Fig. 3 shows a suitable arrangement and construction of the visual descriptive display panel 37.

The front face of the panel 37 contains a schematic and simplified illustration 77 of a hot water reservoir.

5 Illustration 77 is generally centered in the panel. The lamps 36, which monitor the operation of the system, are located in the portion 42 on one side of the illustration 77 of the heating unit. The lamps 36, with which the function of the components is monitored, are located in the separate part 43 on the opposite side of the illustration 77 of the heating unit shown.

The lamps 36 are vertically disposed in the two parts 42 and 43 and are aligned with the lamps disposed at the rear of the openings in the panel 37 on the display plate 40 and suitably via one line-placed openings 78 are exposed. The apertures and lamps are logically spaced and grouped with appropriate directions, as shown, located in the immediate vicinity of the lamp. In the embodiment shown, the operating portion 42 includes an energy lamp 79, which is shown as an upper display element and illuminates when energy is supplied to the heater control.

The condition of the thermostat unit 55 for the heat requirement is shown directly below the energy lamp. The representation of this need includes two vertically disposed lamps and includes a first lamp 80, which indicates a standby condition, and a second lamp 81, which indicates a heat demand.

The lamps 36 of the operating system are chosen so that they light up in the same common color, for example green, with the exception of the standby lamp 80, which is different and for example lights up yellow.

Two lamps, which are spaced downward from the heat demand display and relate to the pump operation mode, contain a first lamp 82, which illuminates when the pump 3 is switched on. , and a second lamp 83, which illuminates when the pump is operating in the cooling mode. This, of course, provides a direct indication of the state of the flow system.

The burner igniter 70 is provided with a separate indicator lamp 84, which illuminates when the igniter is in operation.

Finally, in the operating display section 42, a throttle monitor group with three lamps is provided. The first lamp 85 monitors the pilot valve 68, the second lamp 86 monitors the low inlet valve 69, and the third lamp 87 monitors the high inlet valve 66. The combination of the throttle valves 86 and 87 and the pilot lamp 85 provides a continuous indication of the state of the burner 6 with regard to the supply of heat to the hot water reservoir.

The fault display section 43 is located on the right side of the schematically shown hot water reservoir 77 and contains the series of lamps 86, which are arranged in the vertical direction and which indicate a fault of certain control and operating components. Again, appropriate markings are provided to indicate the special malfunction. The lamps 36 in the fault display section have a single color, for example red. The lamps are normally turned off and are energized to indicate a malfunction of the affected component or function.

In the fault display section, a connecting line 88 is drawn between the respective lamp 36 and the special element or component of the hot water reservoir, which is monitored for a fault.

In the illustrated embodiment of the invention, the failure display portion 43 includes a first lamp 90, which provides an indication of the state of the flue gases. When an adverse blockage of the flue gases occurs, the lamp 90 lights up. A second lamp 91 indicates the state of the excess carbon monoxide (CO) which may be present in the flue gases and when it is present the associated lamp is turned on.

A flow lamp 92 is coupled in the circulation line to indicate whether a sufficient flow of water passes through the system for proper operation of the system) if not, the lamp is turned on.

A coil high temperature lamp 93 is provided to indicate coil overheating.

Two lamps 94 and 95 are present, which respectively indicate a low gas pressure and a blocked gas flow.

By simply considering the display panel, the operator can easily determine the state and normal operation of the system as well as the source of a malfunction that could occur.

The electronics for the diagnostic module contains a low voltage connection with the associated sensors and drive circuits for operating LED lamps or other display and / or warning devices.

Fig. 5 schematically shows the plate for driving the display panel in a circuit with lines crossing each other. The drive circuit for the display panel is a low voltage direct current circuit. A lowering transformer 100 is connected to the incoming main supply lines 50. A dual phase rectifier 101 connects the secondary winding of transformer 100 to two DC output lines 102-103 to drive the circuitry of the display lamps. The transformer rectifier circuit provides a B volt direct current between lines 102 and 103. The output is not filtered, since the LED lamps 36 with the unfiltered direct voltage and direct current provide a clear display. The transformer 100 is mounted within the jacket 13 on the hot water reservoir and the low voltage lines from the transformer form part of the cable to the display module connector 39. A single-pole, double-stroke switch 104 has, as shown, a first pair of contacts 105 connecting certain components to return line 103 as described below. The second set of contacts 106 of the switch 104 provides a common circuit connection for manually testing the various lamps 36 to ensure the operation of these lamps. When the lamps are turned off, the switching units 104 can be operated briefly to check the condition of all the lamps 5 for a necessary replacement and the like.

In the illustrated embodiment of the invention, a plurality of parallel circuits are connected between leads 102 and 103, each of which monitors the different states, as set forth, on the display panel. In Figures 4 and 5, the corresponding monitoring lines are indicated in a corresponding manner.

The energy lamp 79 is connected in series with a current-limiting resistor 107 directly between lines 102 and 103. When power is supplied to the operation circuit 15, as shown in FIG. 4, the power must also occur at the DC drive lines 102 and 103, with the lamp 79 lit accordingly. If the lamp 79 is not lit, this is an indication that energy is not being fed to the diagnostic module or controls for the hot water reservoir, and the system then requires immediate attention to ensure proper operation. Since the lamp 79 is directly connected across the leads, a lamp that does not light should be checked to ensure that the lamp 79 has not burned out. The other lamps 36 are incorporated in the circuit via a special control switch, as described below. The operation of the switch 104 indicates whether or not the other lamps 36 are working or whether another part of the circuit has malfunctioned. As shown, the one contact 30 of switch 106 of switch 104 is directly connected to lead 102. The opposite side of the contacts 106 is connected in series with a blocking diode 109 to the associated lamps 36. When the switch is closed, the energy is connected directly from the power line 102 to the lamp to provide a direct pilot drive.

The first three intersecting circuit branches after • 8802457

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* -20- the energy LED 79 includes a thermostat heating branch 110 and a thermostat standby branch 111. The branch 110 controls the "heating" lamp 81, while the branch 110 controls the "standby" lamp 80. The lamp 80, which is the standby lamp, should burn normally 5 times. The branch 111 is therefore connected directly over the power lines 102 and 103 with the lamp 80 in series with a drop resistor 112. When applying energy to the system, the lamp 80 should light to obtain the desired yellow illumination. The lamp is de-energized via an opto-isolator 113, which is connected to the output of the transformer relay 52 of the operating and control circuit. The opto-isolator 113 is a well-known standard element, for example a model PS25Q6-4, which is manufactured and sold by the Japanese company NEC. The high amplification factor amplifier unit from NEC, indicated above, is sold as an integrated module unit. , which contains four opto-insulators, which have their own separate inputs and outputs. For illustrative purposes only, the units correspondingly indicated in FIG. 5 by the dotted line around the groups of opto-isolators.

Each opto-isolator module has a high gain switching unit containing two LEDs 114 which are connected in inverse parallel. Diodes 114 are determined to operate from a suitable voltage, such as supplied by drop resistors, as shown in Figure 5, which are connected to a 24 or 110 volt power source.

The LEDs provide optical coupling to a fast-acting, optically responsive semiconductor switching device, which is a high gain NPN 30 transistor. The high gain factor construction is desired to provide a switch with high conductivity and minimal voltage drop. The switch can be operated to parallel and turn off a low voltage display LED, which has a voltage drop of about 0.8 to 35 volts, and the like, as described below. In addition to the dual LED amplification devices, single LED are

L8802457 -21- Opto-isolators available »which are widely used. In such devices, a single LED is provided to illuminate a switching transistor. The LED, which is a diode, conducts the AC current input for only half a cycle. In general, a reverse-switched protection diode is connected across the input of such an insulator. In accordance with the ideas of the present invention, the display circuit board 40 is preferably specially formed with suitable openings in the board for mounting and connecting such a protection diode across the input leads with a low gain opto-insulator. As described above, the dual LED opta-isolator units are preferred to provide more efficient energization for efficiently and reliably energizing or controlling the various LEDs of the display unit.

The opto-isolator 113 is generally a semiconductor relay and includes two LEDs 114, which are connected to the control control circuit and, in particular, the transformer-2D lais 52 via a signal line for the selective energization, when power is supplied to the transformer relay as described below. DS LEDs 114 are optically connected to an optical semiconductor transistor 116. The transistor is an NPI! transistor, the base of which is exposed to the light rays 117 of LEDs when the LEDs 114 are energized. The transistor collector 118 is connected directly to the junction of the drop resistor 112 and the lamp 80. The emitter 119 of transistor 116 is connected to return line 120 and return line 103 through normally closed contacts 105 of switch 104. When the LEDs 114 are energized, the transistor 116 is quickly turned on and the lead 120 is connected to the anode side of the lamp 80. The cathode side of the lamp 80 is directly connected to the return line 103. The opposite sides of the lamp 80 are therefore connected to the common return potential and the lamp is not energized.

c $ 802457 c -22-

Each opto-isolator shown is identical to the LEDs and a switching transistor. Each associated element of each opto-isolator can therefore be indicated for the simplicity and clarity of the explanation with associated numbers 5, which are indicated at the opto-isolator 113.

The thermostat line 110 "heating" is included in the circuit through an opto-isolator 121. The collector of the opto-isolator switch 121 is directly connected to the line 102, while the emitter 119a is arranged in series with a drop resistor 122 in the circuit with the lamp 81, the cathode of which is directly connected to the return line 103. When the opto-isolator 121 is energized, the associated transistor is turned on and the circuit is completed from lead 102 through lamp 81 to lead 103. The lamp 81 then lights up, which indicates a heat demand on the display panel as a result of the lamp 81 lighting up.

The input side of the opto-isolator 121 is connected to the control circuit via a coupling resistor 123 in a connection signal line 124, which is numbered correspondingly in Figures 4 and 5. The line 124 is connected to the main output of the transformer relay 52 and the cooling module 53 and flow switch 58 to the control transformer 58. Line 124 is connected to a 115 full line in the controller. The drop resistance 123 limits the current through the LEDs of the opto-isolator. When the thermostat 55 closes, energy is supplied to these components, as discussed above, while simultaneously operating one. low voltage signal is transferred to the display circuit. Thereby, energy is supplied to the opto-isolators 121 and 113.

In the embodiment shown, the pump "cooling" lamp 83 is operated by the cooling unit 53 and is also mutually locked with the display of the condition of the thermostat. In particular, the cooling lamp 83 is connected via a branch 125 in the circuit included. The lamp 83 is normally off. The transistor 126a of the opto-isolator 126 is connected between the return line 120 and the anode side of the LED lamp 83.

.8802457 -23- *

When the opto-isolator is energized, the transistor is turned on to energize the lamp 83, indicating that the pump is operating in the cooling mode. The opto-isolator 126 is connected in series between the opto-isolator 113 and the resistor network to the return side of the 110 volt power source. Thus, the three opto-insulators 113, 121 and 126 are energized from the 115 volt source upon appropriate actuation of the thermostat switch 55 via the drop resistor 123 and the resistor network. When all three opto-insulators 113, 121 and 126 are energized, the associated lamp 80 is de-energized while the lamps 81 and 83 are energized. This provides an indication of the heat demand and the lockout and establishment of the pump cooling cycle.

The pump 3 has a pump-on lamp 82 which is connected in a branch 127 and is connected in series with an opto-isolator 128 between the lines 102 and 103. Therefore, the lamp 82 is normally off and is energized only when the opto-isolator 128 is energized. The opto-isolator 128 is separately connected to the control circuit and in particular 2D to the input signal power line from the pump cooling unit 53, as shown, through the connecting line 129j which also includes a voltage drop resistance equal to the resistor 123. When power is supplied to the pump, a 110 volt signal is transferred through the resistor network 129a to the lamp side of the opto-isolator 128. This illuminates the associated transistor 128a and turns the lamp 82 on.

In the circuit described so far, in the normal operating section 42 of the diagnostic module, the lamp 79 is on, the standby lamp 80 is off, the heat demand-3Q lamp 81 is on, the pump is "on" lamp 82, which indicates the energy demand for the heating and operation of the pump.

As noted above, the pump must be energized through the cooling unit to establish flow and operate flow switch 35 58 to provide energy for the AC voltage transformer 56.

When the above lamps are lit as indicated, the igniter and pilot lamp should be appropriately energized at the same time or very soon. An ignition lead 130 is provided when the ignition lamp 84 is included in the circuit via an electro-opto-isolator 131 for monitoring the power to the pilot burner valve. In the control lamp 85 and the branch line 132, the lamp 82 is generally connected to the anode side of the lamp 84. The opto-isolator 131 is connected via a signal line 133 to be energized when power is supplied to the control valve 68. The collector of the transistor of the opto-isolator 131 is connected to the lead 102, the emitter is connected to the junction 134, which the branch circuits 130 and 132 have in common, while the cathode side of the LED lamp 85 directly with the return lead 103 is connected. Therefore, the lamp 85 is energized when the opto-isolator 131 is energized. This also connects the anode side of the ignition LED 84 to the energy side. The cathode side of the ignition LED 84 is connected to the return line 120. Therefore, when the opto-isolator 131 is energized, the LED 84 is also energized as a result of the return path 120. At the initial actuation of the ignition. module 64, both lamps 84 and 85 are turned on through the optosiolator 131 with slightly different return circuits, indicating the ignition condition. When the energization of the burner is established, the ignition lamp 84 is turned off as follows.

The transistor 136a of an opto-isolator 136 is directly connected in parallel with the ignition LED 84. When the opto-isolator 136 is energized by a signal from the operating circuit, the transistor 136a and 30 conduct the lamp 84 for a short time, thereby terminating the lighting of the ignition unit.

The opto-isolator 136 is connected via a signal line 137 to the main valve output terminal of the control and ignition module 64. This output terminal is connected to the low main burner valve 69. The opto-isolator 136 is connected in series with an opto-isolator 138, which is connected in the low main burner valve branch 139 of the display driving circuit. The opposite side of the opto-isolator 138 is coupled to the AC return line 133a to complete the actuation of units 136 and 138 upon completion of ignition. The collector of the transistor 513a of the opto-isolator 138 is connected to the lead 102, while the emitter is connected in series with the branch 139 to connect in series with the LED 86 to the return side 103 of the power source. When the opto-isolator 138 is energized, the LED 86 is switched on. When a suitable signal is received via the line 137, both opto-isolators 136 and 138 are energized. The opto-isolator 136 turns off the ignition lamp 84 and at the same time turns on the low main burner valve lamp 86.

After the burner 6 is ignited, the ignition lamp 84 is turned off and the pilot lamp 85 and the low main burner valve lamp 86 remain on.

At the initial actuation and when the water temperature is below the minimum level set by the switch 63, the low switch 83 of the high / low control thermostat 61 is closed and the valve 66 is energized. The lamp 87 is then energized via a branch circuit 140 of the display circuit shown in Fig. 5, as follows: the LEDs of an opto-isolator 141 are connected via a signal line 142 to the operating circuit 25 and in particular to the line. from switch 63 to valve 66. When the switch 63 is closed, the optosiolator 141 is energized. The collector of the switching transistor 141a of the opto-isolator 141 is connected to a common node 143 between the emitter in the branch circuit 139. When the opto-isolator 138 and the opto-isolator 141 are energized, the collector of the transistor 141a is connected in series with the switching transistor 138a to the main power line 102. The collector of the transistor 141a is connected to the emitter circuit, which is connected in series in the branch line 141 to the return line 103, thereby energizing the LED 87. In this state all three lamps 85, 86 and 87 are energized, indicating the associated state of the throttle with the pilot lamp on and the igniter off.

This provides a full representation of normal operation on a continuous basis. As noted above, the hot water reservoir first operates to heat the water from a temperature below a minimum level. The water is heated gradually, with both the low and the high valve 66 resp. 69 are open to allow maximum heat input to the heating system. When the 1 ° temperature approaches the low temperature or the temperature of the minimum level and reaches and exceeds this temperature, the switch 63 opens the high / low control unit 61. The valve 66 is de-energized. At the same time, the energy is removed from the signal line 42 and the opto-isolator 141 becomes currentless. The transistor switch 141a as well as the lamp 87 are turned off. The operator then knows that the low heat input device is operating due to the fact that only the pilot lamp 85 and the low input lamp 86 are lit. As the temperature rises further, it reaches the maximum temperature level at which time the switch 62 opens, de-energizing both the pilot light 85 and the low input valve lamp 86. Thermostat 55 remains closed due to a demand from the separate thermostat valve. The pump mode lamps automatically indicate the continuation of the cool down cycle.

Therefore, thermostat 55 will open, de-opto isolators 121, 113 and 126 de-energized. The bypass of the thermostat heating branch opens due to the de-energizing of the opto-isolator 121. The de-energizing of the opto-isolators 113 and 126 also terminates conduction through the switching transistors of these opto-isolators. As described above, these switches are parallel to the lamps 80 resp. 83. switched. As a result, the diversion or short circuit across these lamps is eliminated and the lamps are turned on. The standby lamp 8D as well as the turn-off lamp 83 will be switched on. The "pump on" LED is still energized due to the continued energization of the opto-isolator 128. The cool down period is indicated for the operating and maintenance personnel.

The branch circuits for monitoring the lamps 90 through 95 of the fault section are similarly incorporated into the circuit of the low voltage DC supply lines 102 and 103, the separate inputs to the associated opto-isolators with the series of switches 65 of the operating control circuit. When the devices are operating properly, each LED is not energized. In the event of a fault, the respective opto-isolator is operated in an associated branch circuit of the control drive unit to turn on the associated LED.

Referring to FIG. 5, the LED 92 is included in the branch circuit 145 to detect insufficient water flow through the system. The lamp or branch 145 is included in the circuit via the pump in the branch line 127. The anode side of the lamp 92 is connected via the current limiting resistor to the emitter of the pump-on opto-isolator 128. When the pump is operating, the associated switching transistor 128a is conductive and power is supplied not only to the pump LED 82 but also to the anode side of LED 92. The cathode side of the LED 92 is connected to the common return line 120. The LED 92 is energized by this. An opto-isolator 147 with a switching transistor 147a is connected in series with the LED 92 and, when energized, short-circuits the lamp circuit with ground, thereby effectively turning off the lamp 92. The input of the opto-isolator 147 is connected by a signal line 148 to the secondary winding of the transformer 56. The flow switch 58 closes at a sufficient current and energy is now fed to the opto-isolator 147. The transistor is energized and turns LED 92 off.

The other systems are similarly interconnected in branch circuits.

The high limit of the spiral LED 93 is included in a branch circuit 151. The collector of the switching transistor 152a is connected to the power line 102, while the emitter is connected to the branch circuit 151 and the cathode side of the LED 93 to the return line 103. When the opto-isolator 152 is energized, the transistor 152a becomes conductive and the LED 93 is energized. The coil high temperature sensor 18 is connected to the coil and controls a high coil limit switch 154, which is connected in series with the bundle switches 65 to complete one side of the AC voltage circuit 10 to the ignition module. The opto-isolator 152 is connected in parallel with the switch 154. A signal line 155 connects one side of the opto-isolator to one side of the switch 154. A second signal line 156 connects the other side of the opto-isolator to the other side of the switch 154. When the switch 154 is closed , the lamp circuit of the opto-isolator 152 is briefly closed. When the switch 154 opens due to too high a coil temperature, a current flows through the line 155 and the lamp side of the opto-isolator and returns through the line 156.

By energizing the opto-isolator, the switching transistor 152a is energized, thereby supplying energy to the LED 93 for the high temperature limitation of the coil.

The low gas pressure unit 94 is included in a branch circuit 157. The branch circuit 157 is connected through the switching transistor sistor 158a of an opto-isolator 158 over the DC power supply lines 102 and 103. The opto-isolator 158 is connected to the control circuit in parallel with a low gas pressure switch 159, one side of which is connected to the signal line 156 and the other side to the signal line 160. The switch 159 is connected to the sensor 23 in the gas pipe to the valve construction 7. When the gas pressure drops below a certain minimum level, the switch 159 opens. The switch normally short-circuits the opto-isolator 158. By opening the switch 159, the short circuit is canceled and alternating current energy now passes through the LEDs of the opto-isolator 158, energizing the associated switching transistor 158a and energizing the tap «8802457 τ -29- 157 lined to turn on the LED 94. Turning on the LED 94 immediately gives the operator a signal that the gas pressure is low. The blocked flue lamp 90 is similarly received in a branch 5B1 containing an opto-isolator 1B2 which similarly supplies energy to the lamp 90. Opto-isolator 162 is included in bundle switches 65 in parallel with a blocked flue switch 163. The other sides of the switch 163 are connected to the signal line 160 and one signal line 166. The lines 160 and 166 are connected to the other sides of the input of the opto-isolator 162 and the circuit operates in the same manner as the previous circuits to indicate a blocked flue state.

The LED 91 for the excess CO is similarly incorporated in a branch circuit 167 and connected to an opto-isolator 168. A CO sensing switch 170 is included in the series of switches 65 and is connected to the opto-isolator 168 via the signal lines 166 and a signal line 169.

The Barred Gas Flow LED 95 is similarly included in a branch circuit 171 via the low main burner branch circuit 139 with a short-circuit opto-isolator unit 172. A limited gas flow switch 173 is connected to the connection between the control transformer 25 56 and the switching unit 61 and is connected to the unit 172 by a signal line 174. Switch 173 is kept closed by normal gas pressure. A limited gas flow opens the switch 173. The monkey switch 173 keeps the opto-isolator 172 off and the LED 95 is turned on by the low head 30 burner tap 139. When the power is established, the switch 173 closes the opto-isolator 172 isolator 172 energizes and transistor 172a turns LED 95 off. The disclosed system provides continuous monitoring of different selected components with the different LEDs 90 to 95, 35 which are selectively energized according to a condition of the different components. Malfunction of one of the components produces a corresponding illumination of the c 8802457 * -30- LED of the descriptive screen.

At the same time, the. main control circuit to the ignition module opened, which results in an immediate shutdown of the control unit and in particular of the hot water reservoir 1. The display section 42 describes the shutdown of the heating unit, with the heat LED 81 turned on and a standby LED 80 turned off, indicating that there is a heat demand while the other lamps are energized to turn off the heat. 10 to indicate the switched state of the heating device.

One or more failure lamps 90 to 95 are energized to indicate the location of the failure and the reason for the heating unit to shut down.

The shown embodiment of the invention provides a continuous monitoring of the condition of the hot water reservoir without in any way affecting the operating system of the hot water reservoir. The optoisolators or any other similar operating devices offer the option of monitoring the control of the hot water reservoir with complete electrical isolation of the monitoring devices from the control circuit of the hot water reservoir. The optos isolators with the series of resistors form high input impedance devices to ensure the normal operation of a hot water tank control circuit with the monitoring circuit as shown and described. As a result, the monitoring is complete without in any way affecting the normal operation of the hot water reservoir control circuit.

The insulated power supply display circuit 30 to the light emitting diodes or other lamp units acts as semiconductor relays and as logic devices to provide the correct related control in the sequence of the indicators, in particular in the normal sequence and switching on the operation and 35 switching the heating unit on and off. The system continuously maintains and produces a descriptive visual representation of the various functions of the control of the hot water reservoir and the condition of its components currently operating. In particular, the monitoring indicates not only the switch-off point in the sequence, but the fault component or components, which enables efficient and rapid maintenance of the control of the hot water reservoir and its operating system.

The isolation of the monitoring circuit from the operating control and the incoming alternating current power lines results in a diagnostic module which is not only very useful as an integrated descriptive display system of the hot water reservoir, but can also be connected to other systems. For example, the integrated diagnostic module can be easily connected to a remote display, monitoring a number of hot water reservoirs, alarm circuits and the like to provide optimal system control in a large industrial complex.

A separate cover display panel 37 is mounted on the circuit board 40 with a structure that provides universal use with a series of hot water reservoirs. For example, in a commercial production line of applicant, three different commercial gas fired base hot water reservoirs are produced. Each hot water reservoir contains the gas burner with a suitable throttle construction and means for controlling the temperature of the water and the like. Different hot water reservoirs, however, have a number of different types of selection structures. For example, certain hot water reservoirs have redundant valves that are actuated to turn off 30. These different system types require different types of business monitoring. Multiple burners have separate control valves with the burner operating in a single stage or a dual stage. In contrast to an ignition system, other simpler models use a permanent pilot. With such a system, it is only necessary to monitor whether or not the throttle is energized or de-energized. To conserve energy, certain gas-fired units have a flue valve to open and close the flue in accordance with the burner being turned on and off.

In general, hot water reservoirs of the latter type do not provide a pump circulation. The position of the valve in the flue can then be indicated instead of the pump mode unit. In general, the circuit board for the display panel and the display panel are designed such that the maximum number of vertically disposed lamps 10 is present and controlled. The cover panel 37 is provided with suitable openings and markings which are in line with the lamps which are present for the special module or the special hot water reservoir. The circuit board 4G can be constructed as a basic construction, which provides the convenient mounting and connection of the maximum number of lamps. The number of lamps installed is, of course, directly related to the special heating unit. The circuit board is preferably equipped with at least one additional opto-isolator unit for four units 2Ό, so that four additional branch circuits are present.

The module can easily be configured and mounted as an integrated part of the hot water reservoir, as shown. The electronic circuits and their manufacture are based on readily available and recognized circuit technology. The components can generally operate in the vicinity of most commercial hot water reservoirs - Certain commercial hot water reservoirs operate at temperatures that adversely affect the life of the lamp units 3D of the descriptive display module. The electrically insulated and low voltage direct current display system offers the possibility of a suitable mounting of the display unit 35 near the actual hot water reservoir with a reliable low voltage connection cable.

The present invention therefore provides a significant improvement in the monitoring for on-site analysis of a hot water reservoir and the associated system.

8802457

Claims (16)

1. Hot water heating system with an AC powered control system and a number of different controls and controls associated with the operation of a heating unit for heating the water, which system is provided with a diagnostic module for establishing providing a descriptive display of the state of the hot water heating system, comprising means for monitoring the operating state of the heating unit, separate means for separately monitoring the separate state of the number of controls and operating components, a descriptive display with an operating display section having a number of separate display elements, which display elements relate to the different operating mode of the water heating unit and provide a number of different displays for each operating mode, the descriptive display panel having a malfunction display portion having a plurality of display means for each of the monitored or certain critical components, and circuit means comprising the component display means with each of the components for monitoring the state of the components and driving the display means the combination of the descriptive operating display section and the descriptive fault display section indicating the state of the heating unit and the components including displaying the state of the heating unit on shutdown and the fault component. System according to claim 1, characterized in that the diagnostic module is mounted on the heating unit. 3. System as claimed in claim 1, characterized in that the heating unit comprises a control construction which is mounted on a common carrier, the module being mounted on this carrier. System as claimed in claim 1, characterized in that the module comprises a support box, which is provided with an open surface, a circuit board, which is mounted on the box with the display means, which is provided in there is agreement with the display means, and a descriptive panel is mounted on the plate. 5. System according to claim 1, characterized in that the hot water heating unit comprises a gas burner with a gas control operating element, a valve construction with a control valve member and a main burner valve member, the operating display part comprising an auxiliary part for the gas valve construction with a a plurality of adjacent display means including an burner control output means and a gas burner valve display means for separately establishing the state of the valve means. 6. System as claimed in claim 2, characterized in that the control burner contains electric ignition means and the operating display part contains an ignition display means, with which the state of the ignition means is indicated. System according to claim 1, characterized in that the main burner is a multi-stage burner and the valve structure includes a number of different valve means for changing the gas supply to the burner, the operating display part comprising a number of separate display means for each valve of the number of valves for monitoring and displaying the condition of the valves and thereby of the gas supply to the burner. 8. System as claimed in claim 1, characterized in that a circulation pump is operated to flow water through a heat exchanger coupled to the burner, a pump control is provided, with which the pump responds to a need for heat and at a specific time after the heating unit has been switched off, the operating display part has first display means which can be operated in response to the operation of the pump, and second display means which are operated in response to the operation of the pump for the predetermined time could be. System according to claim 1, characterized in that c 8802457 -35-? the fault display section includes separate branch circuits containing separate branch circuits for each of said components, each branch circuit including a display means and means for operating the display means according to the condition of the monitored component to indicate a fault identify. 1G. System according to claim 7, characterized in that the last-mentioned means act simultaneously with the operation of the fault display means to decouple the heating unit from the operating section, wherein at the time of the fault the identification or description of the state of the heating means is established and maintained. 11. Water heater, comprising a heating unit with a burner and a water tank coupled to the burner for heating the water passed through the pump of the tank, thereby establishing a flow through the tank, thermostat means for creating a heat demand, means for operating the burner and the pump, sensor means connected to the burner and sensing the operation of the burner, sensor means connected to the pump and the observe operation of the pump, sensor means for detecting the condition of the thermostat means, an operating and control circuit connected to the thermostat means, a display module with a support box and an outer display panel, which is a wall of the box display circuit means contained in the cabinet with a low voltage DC power supply cable and a low voltage sensor cable with 30 sensors. indicia connected to the sensor means, the panel being provided with a plurality of lamps indicating the operating state of the heating unit and containing first display means indicating the condition of the thermostat means, second display means indicating the input to the burner indicate third display means, which indicate the start-up cycle of the heating unit, while the panel is provided with a number of display means, which comprise first display means, which monitor the operation of the gas pressure means, and second display means, monitor the presence of water in the tank, and third display means, which establish the operating level of the heating means. Hot water heating device according to claim 11, characterized in that the display module contains separate display branches for each display medium, each display line comprising an opto-isolator connecting the display line to the low-voltage direct current supply, with each opto-insulator. insulator input lamp means with input connection elements and a switching transistor, the sensor leads comprising a coupling resistor connecting the input connection elements to the sensor means for operating the transistor, the transistor being connected such that the energization of the lamps in the branch pipes. 3. Hot water heating device according to claim 12, with 115 volt input means and wherein the means for operating the burner and the pump comprises a "cool down" timer, which is switched such that the pump responds to a heat demand. is put into operation and the operation is maintained for a certain period of time after the burner has been switched off, wherein an ignition module for igniting the burner is present, the timer is connected to a 110 volt input means, the ignition module has a lowering transformer, which is connected to the 110 volt input means and creates a 24 volt alternating current operating voltage for the ignition module, the leads including transistors to reduce the voltage to the lamps. 14. Device as claimed in claim 13, characterized in that the connection of the input means to the alternating current operating means is selected and implemented in such a way that the lamps are operated in accordance with the condition of the monitored means, the lamps in the case of a malfunction and the switching means operate simultaneously with operating the malfunction branch line to disconnect the heating unit from the operating section, thereby identifying or describing the state of the heating means at the time of the failure. failure is established and maintained. 15. Device as claimed in claim 11, characterized in that the burner is a gas-fired burner with a control element-operated gas burner, which comprises a valve construction with a control valve means and a main burner valve means, the operating part comprising an auxiliary part for the gas valve construction with a plurality of neighboring lamps, including a pilot burner lamp and a burner valve gas lamp for separately and separately establishing the state of the valve means. 16. Device as claimed in claim 15, characterized in that the control burner comprises a high-voltage ignition means and a lamb sensor means, the operating display part containing an ignition display lamp, which indicates the state of the ignition means. 17. Device according to claim 16, characterized in that the main burner is a multi-stage burner and the valve structure comprises a number of different valves for adjusting or changing the gas supply to the burner, the operating display part of which comprises a number of separate display lamps. pin for each valve of the plurality of valves for monitoring and displaying the condition of the valves and thereby of the gas supply to the burner. 18. Water heater, comprising a heating tank with a central vertically oriented flue, a gas burner mounted on the bottom end of the tank and producing a gas flame coupled to the tank for heating the water, flowing through the tank, a gas valve assembly connected to the gas burner and containing a pilot burner for producing a pilot flame near the burner, the gas valve assembly having a first gas valve connecting the burner to the connects the burner inlet line to a gas supply line and establishes a relatively large flow rate gas stream, the throttle assembly including a second main gas valve connecting the supply line v 6801457 -38- to the gas input line parallel to the first gas valve and a second gas supply to the gas burner up to wherein the pilot valve and the first and second throttle valves each include a separate electrical actuator which are provided with first and second switching means, wherein the first switching means comprise a low temperature switch, which can be operated to demand heat at a certain minimum temperature, and the second switching means are operated at a second higher temperature level, an operating 10 circuit for operating the throttle valve assembly in accordance with the setting of the switches and pilot burner, a high voltage demand circuit with a demand thermostat to actuate the heater and with a transformer relay and a pump control relay, pump control relay has a first input, which is connected to an output of the transformer relay, and a second input, which is directly connected to the power line, the pump control relay providing energy to the pump unit in response to the energy from the transformer relay and operated tempering agents are provided, that the pump continues to operate via the direct power connection for a certain period of time after the energy has been removed from the transformer relay to establish a cooling cycle, the primary winding of the reduction transformer of the control circuit connected to the output of the transformer relay for energizing the control circuit following the output of the transformer relay, a flow switch connected in series in a connection line between the transformer relay and the down-transformer 30 to turn off the heating unit due to abnormal flow conditions, a descriptive display unit having a operating display section and a component fault display section, the operating display section having a plurality of lamps indicating the operating state of the heating unit and including a first display indicating the heating or standby state, a second display means indicating the heating condition including <8802457 -39- of the heat input state of the burner, the operating portion comprising an intermediate display means identifying the start-up cycle of the heating unit, the fault display including a first display element indicating the monitors heating means including the state of the input to the heating means, and a second display means, which establishes the temperature of the heating means, and a third display means, which indicates a minimum water flow. 19. Water heating system, comprising a water heating unit with a circulating coil for heating water on demand for heat and at least one separate hot water storage unit, which is connected in a closed recirculation loop to the water heating device, the water heating device being a gas-fired burner with a valve construction comprising a control valve for supplying gas to a control burner with electromagnetic valve, a high solenoid valve for supplying gas to the burner and a low solenoid valve 20 for supplying gas to the burner, the water heating device flue which extends upward from the heating device and which exhausts flue gases from the water heating device, comprising a thermostat control with a first low temperature switch and a high temperature switch, which form a heating region to keep the water substantially in this area, a flow responsive switching means which is connected in the recirculation system or loop for monitoring the flow rate through this system, a low pressure gas sensor, which is switched between the valve assembly and the burner and the pressure can be continuously monitored and operated, when the pressure falls below a certain pressure level, means coupled to the gas pipe and monitoring the flow through the gas pipe and operating a switching means when the flow falls below a certain level means connected to the spiral means for monitoring the temperature of the spiral and operating a switching means when the temperature of the spiral rises above a certain temperature level, flow means the flue is connected to monitor the flow rate of the flue gases, which means are provided with a switching means which are operated when the flow rate falls below a certain level, gas monitoring means coupled to the flue monitor the CO2 content of the flue gases and are provided with switching means which are operated when the CO2 gas content rises above a certain level, a display unit, which includes a display panel with adjacent vertically oriented display sections including a first display section, which identifies the operating state and sequence of the water heater, the second section being provided with indicia indicating the particular, Identify watched components of the water heater, the control display section having a first e-energy lamp, two thermostat lamps, comprising a standby lamp and a heat demand lamp, the control section having two pump mode lamps, the two containing a pump-on lamp and a cooling lamp, the operating part has an ignition lamp, the operating section is provided with three lamps related to the valve structure, comprising a control lamp, a high combustion lamp and a low combustion lamp, a low voltage direct current drive circuit for the lamps, comprising an isolation transformer rectifier unit connected to the alternating current source and establish a low voltage DC power supply for the lamps of the operating section, each lamp being connected to the DC power supply lines by a branch circuit with an electric opto-isolator, which includes a signal input lamp and an optically coupled semiconductor switch, the input means of the opto-isolator to be selectively coupled to the control circuit to monitor the condition of the thermostat means, the pump-35 lamp is coupled such that the energy supply to the pump is monitored directly from the thermostat means, the cool-down lamp with the cool-down unit v 8802457 -41 - * monitoring of the pump during the cooling cycle, the opto-isolator means of the ignition lamp is coupled to the ignition module with the input energy to monitor the operation of the ignition means, the control valve and the low combustion, electromagnetic lamp means have a common opto-isolator circuit, the input of which is connected to the output of the ignition module, the input of the opto-insulator of the high combustion lamp with the connection of the thermostat to the high-combustion electromagnetic The valve fault monitoring portion for the drive circuit includes separate branch circuits for controlling the fault lamps, which circuits include separate branch circuits for each lamp, each of the last branch circuits including an opto-isolator, which the AC operating circuit is connected and has an input which is connected to d The AC operating circuit is connected and has a semiconductor switching transistor which is switched to control the energization of the lamps, the connection from the input to the AC operating means being selected and made so that the lamps are the state of the monitored means is operated, the lamp being energized in the event of a staring, the switching means acting simultaneously with the operation of the fault line means 25 to disconnect the heating means relative to the operating section and at the time of the failure to establish and maintain the identification or description of the condition of the heating means. .8802457