JP2923739B2 - Hot water circulation type heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water circulation type heating apparatus provided with a water heater for heating by circulation of hot water and having an expansion tank in a circulation path of hot water.

[0002]

2. Description of the Related Art In a conventional apparatus of this type, an expansion tank is open to the atmosphere, and hot water always evaporates from the expansion tank. When the hot water runs out, not only the heating operation becomes impossible, but also parts such as a heat exchanger using a burner as a heat source deteriorate and noise occurs due to idle operation of the circulation pump. Therefore, it is necessary to supply water when the water level becomes low. Therefore, conventionally, the water level in the expansion tank is detected at least in two stages, a low water level and a high water level, and if the water level falls to the low water level while the power is supplied to the device, tap water is supplied until the water level becomes the high water level. Like that. In addition, in order to prevent the pump from running idle during the antifreeze operation in which the water in the circulation path is circulated by the pump operation when the heating operation or the like is not performed, the water is always automatically supplied when the water level falls below the low water level during energization. It is configured.

[0003]

When a building such as an apartment building is newly constructed and a hot water circulation type heating device is newly installed, only a tip of a water pipe connected to the hot water circulation type heating device is exposed during construction. The hot water circulation type heating device is connected to the end of the water pipe which is exposed when the interior and other construction are almost completed. By the way, debris such as sand may enter into the exposed opening of the water pipe during construction, and when the hot water circulation type heating device is turned on and automatically supplied with water into the expansion tank, the debris will be removed. The refuse enters the circulation path of the hot water and circulates in the circulation path together with the hot water. However, if dust is caught in the middle of the circulation path, other debris will also be caught in that portion, causing clogging of the hot water circulation path.

[0004] In view of the above problems, an object of the present invention is to provide a hot water circulation type heating apparatus in which no dust enters the hot water circulation path.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention according to claim 1 is a hot water circulation type heating apparatus provided with a heating water heater for heating by hot water circulation, wherein An expansion tank is interposed, and the water level in the expansion tank is detected at least in two steps, a low water level and a high water level, and when the water level falls to the low water level, the water is supplied from the water supply into the expansion tank until the water level becomes high. In the water supply system, a faucet that is connected to the water supply path to the expansion tank and that can release tap water at least when water is not supplied to the expansion tank is provided, and the water level in the expansion tank is set to a low water level at the start of energization of the hot water circulation type heating device. When the temperature is lower, water supply inhibiting means for inhibiting water supply to the expansion tank until an operation start instruction of the water heater is provided is provided.

According to a second aspect of the present invention, in the first aspect of the present invention, the hot water circulating-type heating device includes a water heater for supplying hot water separately from the water heater for heating. It is a tap for tapping water connected to a water heater for hot water supply.

[0007]

[Action] Immediately after the hot water circulation type heating device is newly installed, the expansion tank is empty and the water level is lower than the low water level. On the other hand, during the energization of the heating device, the water level in the expansion tank provided in the circulation path of the hot water is always located between the low water level and the high water level. When it is determined that the water level in the expansion tank at the start of energization is lower than the low water level, it is determined that there is a possibility that garbage may remain in the water pipe immediately after installing the hot water circulation type heating device, Prohibit automatic water supply to the expansion tank. Then, if the faucet is opened, the refuse is discharged together with the tap water and refuse can be removed. After the garbage was removed, or when the hot water circulation type heating system was not used for a long time, the water level needed to be supplied when the water level dropped below the low water level. In such a case, the prohibition of water supply was lifted, and water was supplied to the expansion tank. In some cases, a heating device is provided with a hot water heater to provide a hot water supply function. In such a case, the faucet for tapping the hot water is opened to remove dust from the faucet through the hot water heater. be able to.

[0008]

FIG. 1 shows an outline of a system for performing a hot air heating operation capable of switching between strong and weak and a reheating of a bath using a gas hot water heater 1. In the case of the hot air heating operation, high-temperature hot water (hereinafter, referred to as primary hot water) is supplied from the gas water heater 1 to the air conditioner A via the outward path f1, and the room air is heated with the high-temperature hot water to generate indoor air as hot air. To blow. The air conditioner is provided with a fan for blowing air and a heat exchanger (radiator) located in the air passage of the fan and through which the primary hot water flows. Even so, a proportional control valve Av for increasing or decreasing the circulation amount of the primary hot water is provided so that the amount of heat given to the blown air from the radiator is kept constant. The heating capacity can be set in two levels, high and low,
When set to the high side, strong heating is performed, and when set to the low side, weak heating is performed. In this embodiment, a heat exchanger (cooler) cooled by a refrigerant is provided upstream of the radiator,
In summer, it can be used as a cooler, and can also be used as a dehumidifier by using a radiator and a cooler simultaneously. When used as a dehumidifier, the radiator is operated under the same conditions as for weak heating. Then, the condensate that passes through the radiator and gives heat to the air blown from the fan to lower the temperature is returned to the return path b.
1 is returned to the gas hot water heater 1 via the heater 1. The recirculated condensate is heated again by the gas water heater 1 and sent out as primary hot water from the outward path f1, while a part of the condensate before being heated is branched to the outward path f2 as secondary hot water and further separated by the separator. At S, the route is branched into a forward route f3 and a forward route f4. Each outbound f
Both 3 and f4 are supplied to the hot water mats Fa and Fb to perform floor heating, and then return to the gas water heater 1 as condensed water through the return path b1. In addition, when reheating the bath, the primary hot water for the air conditioner A and the hot water mat F
a separate path from the secondary hot water circulation path for aFb is provided,
The hot water in the bathtub B is sucked in through the return path b2, and the air conditioner A
The hot water sucked from the bath tub is heated by using a part of the primary hot water sent to the bath through a liquid-liquid type heat exchanger described later, and the heated hot water is returned into the bath tub through the forward path f5. In addition, D is a room temperature sensor which is a room temperature detecting means, and a hot water mat Fa · Fb.
Is used to detect the temperature in the room where is provided.

Referring to FIG. 2, a gas water heater / heater 1 has a hot water supply heat exchanger Ha using a burner (not shown) as a heat source and a heating water heater. Is provided separately from a heat exchanger 11 for heating using a burner 10 as a heat source, and water is supplied to the heat exchanger Ha from a water pipe W via a relatively large-diameter water supply pipe HP. The heated hot water is supplied via the faucet HK. On the other hand, during the heating operation, the hot water circulated by the pump 2 is heated by the burner 10 through the heat exchanger 11 to become primary hot water,
Is supplied to the forward path f1. The condensed water returned through the return path b1 enters the expansion tank 3 once, and is then sucked by the pump 2. By the way, the condensate discharged from the pump 2 is returned to the heat exchanger 11 through the pipe 13, but a part of the condensate is diverted to the pipe 14 as the secondary hot water and passed through the forward path f 2 to the separator Reach S. The temperature of the primary hot water is detected by a temperature sensor 5H provided in the pipe 12 and the temperature of the secondary hot water is detected by a temperature sensor 5L provided in the pipe 14. In the separator S, the forward path f3
Thermal opening / closing valves Va and Vb are provided corresponding to f4, and the inlets of the outward routes f3 and f4 can be individually opened and closed to cut off the supply of the secondary hot water to the hot water mats Fa and Fb. . By the way, the on-off valves Va and Vb each include a wax pellet and a heater for heating the wax pellet inside,
The wax enclosed by the slidable piston in the wax pellet is heated by a heater and expanded by heating the piston, and the piston is slid, and the valve rod is pushed by a rod of the wax pellet integrated with the piston to open the valve. Also,
Condensate coming out of the warm water mats Fa and Fb returns to the expansion tank 3 through the return path b1. By the way, the forward path f1 and the return path b1 are communicated by a bypass BP. When the proportional control valve Av in the air conditioner A is closed to stop the operation of the air conditioner A and operate the floor heating alone, The primary hot water flows directly into the expansion tank 3 through the bypass BP, and a part of the primary hot water flows into the hot water mats Fa and Fb as secondary hot water so that the sole heating of the floor heating can be performed. The expansion tank 3 is provided with an electrode 31 for detecting a high water level and an electrode 32 for detecting a low water level. When the amount of water in the expansion tank decreases and the water surface moves away from the lower end of the electrode 32, Tap water is supplied through the water supply pipe 33 until the control device 5 opens the electromagnetic normally-closed on-off valve 33 a and the water surface contacts the tip of the electrode 31. Even if the water surface in the expansion tank 3 exceeds the lower end position of the electrode 31, excess water or hot water is discharged through the drain pipe 34.

A portion of the primary hot water is piped from the middle of the pipe 12 so as to branch to the liquid-liquid heat exchanger 4. A thermodynamic on-off valve Vc is provided. The on-off valve Vc is opened only when the hot water in the bathtub B is additionally heated. Hot water in the bathtub B is circulated to the heat exchanger 4 by the pump 40. When adding hot water or filling the hot water, hot water is supplied from a hot water heater H via a pipe 41, The heat is supplied into the bathtub B through the heat exchanger 4 and the forward path f5 and the backward path b2. Incidentally, 4
Reference numeral 2 denotes a normally-closed on-off valve, which is opened when hot water from the hot water heater H is supplied into the bathtub B via the pipe 41, and the hot water passing through the on-off valve 42 is non-return. It is supplied into the bathtub B through the valve 43 and the flow meter 44. Reference numeral 45 denotes a water flow switch, which detects that hot water from the return path b2 due to the operation of the pump 40 is actually flowing into the heat exchanger 4, and always operates the pump 40 only when there is hot water in the bathtub B. This prevents the pump 40 from being damaged or noise caused by idling.

If the operation is not performed for a long time after stopping the heating operation or the like, the hot water in the expansion tank 3 evaporates via the water distribution pipe 34 and the water level becomes lower than the low water level when the operation is started again. There are cases. In such a case, it is conceivable to automatically supply water at the same time as the start of energization as in the past, but if it is set to perform automatic water supply at the same time as the start of energization, the building is constructed and gas hot water is supplied. Heater 1
Water will be automatically supplied even when the power is turned on for the first time after the power outlet has been newly installed. However, when power is supplied for the first time after installation, the water pipe W
There is a case in which dust such as sand that has entered during construction is left inside, and when water is automatically supplied, the dust enters the expansion tank 3. Therefore, if the water level in the expansion tank 3 at the start of energization is lower than the low water level, water is not automatically supplied even when the energization is started, and the warm air heating operation, the floor heating operation, and the reheating of the remote controller 51 are performed. It is necessary to supply water only after a start operation of the heating water heater such as a start operation of the operation is performed. When the heating operation is performed on the remote controller 51 as described above, the faucet HK is opened to remove the garbage even if the system has already been operated at least once, or the first operation after installation. Is completed, and there is no problem even if the expansion tank 3 is supplied with water.

The above operations are summarized assuming that the water level in the expansion tank 3 is L, the high water level is LH, and the low water level is LL. Referring to FIG. 3, when the energization is started (S1), first, It is determined whether the water level L in the expansion tank 3 is lower than the low water level LL (S2). If the water level L is lower than the low water level LL, the state is maintained until the operation of the heating water heater is instructed. (S3), and when the operation instruction is given, water is supplied until the water level L becomes the high water level LH (S4 · S
5).

Although the faucet HK is opened and the refuse in the water pipe W flows out of the water supply pipe HP through the heat exchanger Ha, the refuse is not clogged because the hot water supply path is set to a relatively large diameter. . In the above embodiment, the faucet HK is provided for tapping out of the water heater H. However, the faucet may be provided directly on the water pipe HP without providing the water heater H.

[0014]

As is apparent from the above description, the present invention prevents water from being automatically supplied even when the water level in the expansion tank at the start of energization is lower than the low water level, and the water heater for heating is used. Since the water supply is performed only after the operation start operation, the expansion tank can be supplied with water after removing dust from the water pipes during construction of the building, etc. No garbage enters the circulation path of the city.

[Brief description of the drawings]

FIG. 1 is a diagram showing a connection state between a hot water supply / room heater and peripheral devices.

FIG. 2 is a diagram showing a pipe state in a hot water supply / room heater;

FIG. 3 is a flowchart showing control contents.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas hot water heater 2 Pump 3 Expansion tank 4 (Liquid-liquid type) heat exchanger 5 Controller 31 Electrode 32 Electrode 33a Open / close valve 51 Remote control 5H (Primary hot water side) Temperature sensor 5L (Secondary hot water side) Temperature sensor A Air conditioner B Bath tub D Room temperature sensor Fa Hot water mat Fb Hot water mat S Separator Va On / off valve Vb On / off valve

Claims (2)

(57) [Claims] 1. A hot water circulation type heating device provided with a heating water heater for heating by hot water circulation, wherein an expansion tank is provided in a circulation path of the hot water, and a water level in the expansion tank is reduced to at least a low level. When the water level is detected at the upper and lower two stages of the water level and the high water level, and when the water level falls to the low water level, water is supplied from the tap water to the expansion tank until the water level becomes high, and at least the expansion tank is connected to the water supply path to the expansion tank. In addition to providing a faucet capable of discharging tap water during non-water supply, if the water level in the expansion tank is lower than the low water level at the start of energization of the hot water circulation type heating device, the expansion tank is operated until the operation start of the water heater is instructed. A hot-water circulation type heating device provided with a water-supply prohibiting means for prohibiting water supply to the water. 2. The hot water circulation type heating device includes a water heater for hot water supply separately from the water heater for heating, and the faucet is a faucet for tapping water connected to the water heater for hot water supply. The hot water circulation type heating device according to claim 1, wherein: