CS226885B1 - Automatic pump operation control circuitry - Google Patents

Description

(54) Connection for automatic pump control

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a circuit for automatic control of pump operation, in particular for low-pressure central heating boilers.

In the case of low-pressure central heating boilers, the water level in the boiler is monitored by a transistor relay, which opens and closes the valve and with an electric drive. When the water in the boiler drops, the relay transmits an impulse to open the solenoid valve and after the boiler is filled with water, the relay transmits an impulse to close the solenoid valve. Water supply to the boiler is ensured by a pump that is still running, even if the solenoid valve opens only two to three times per hour, for a maximum of two minutes to replenish the boiler depending on the heating mode. The connection is made so that the switch is connected via a fuse directly to the contactor, which controls the operation of the pump motor.

The disadvantage of the prior art is, in particular, that the pump is still running, which is energy intensive and adversely affects the life of the pump.

<

These disadvantages are eliminated by the connection of automatic pump control, especially for low-pressure central heating boilers. It consists in that a control selection switch is connected to the control phase, the first contact of which is connected to the input contact of the first relay whose output contact is connected both to the second contact of the control selection switch and to the central contact of the pump selection switch ,

226 885

226 885 whose first contact is connected to a contactor for controlling the operation of the first pump motor and the second contact is connected to another contactor for controlling the operation of the second pump motor, the coil of the first relay being connected to the solenoid valve and to the transistor relay.

In particular, the progress achieved by the invention is that the pump only runs during its active operation, ie when pumping water into the boiler, which is beneficial both in terms of energy savings and in terms of increasing pump life.

An exemplary embodiment of the invention is shown in the accompanying drawing, where there is a wiring for automatic control of pump operation for two boilers with the option of automatic and manual control and the choice of operation of one of the two pumps.

The selector switch Ag is connected by its central contact via fuse P 2.1 to the control phase R. This switch Ag has two further contacts, the first contact 12 for the automatic control connection and the second contact 13 for the manual control connection. The first contact 12 is connected to the input contact 6 of the relay K1, whose output 6 is connected to a node B, which is connected both to the second contact 13 of the selector switch Ag and to the central contact 21 of the selector switch A. This switch A1 also has two contacts, a first contact 22 for actuating the switching contactor Sg of the first pump motor and a second contact 23 for actuating the switching contactor Sg of the second pump motor Mg. The first contact 22 of the pump selection switch A1 is connected to the coil of the next contactor Sg and the second contact 23 is connected to the coil of the next contactor S4, the outputs of both contactors Sg, Sj being connected to the neutral conductor N.

In case the pumps Mj, Mg are intended for several boilers, eg two, a second relay Kg is connected between the first contact 12 of the switch Ag and between the node B in parallel with the first relay K1. In the event of a third boiler, a third relay K1 is connected in a similar manner.

The coil of the first relay K ^ is connected via its terminal 1 to the electrovalve EV and from there to the neutral conductor N and to the transistor relay TR, which is on the boiler and connected to the control phase R. The coil of the second relay Kg is connected another terminal Sv / to another electrovalve EV * and another transistor relay TR *. connected to control phase R.

When the transistor relay TR, which monitors the level in the first boiler, is switched on, the electrovalve EV and at the same time the relay K1. Control phase R through fuse P 2.1 and through center contact 11 to first contact 12 of selector switch Ag and through closed contact of first relay K ^, energizes contactor Sg, which commands the motor of the first pump. , turns off the TR transistor relay for the EV solenoid. which closes the water supply and at the same time switches off the closed first relay K1. In the event of a fault, manual control of the switch Ag can be switched on by switching the middle contact 11 to the second contact 13 and in the case of a failure of the first pump the switch A? For selecting the pump is switched to the second contact 23. switching on any relay TR will switch next

226 885 contactor Sj for second pump motor control Mg ·

Claims (2)

SUBJECT OF THE INVENTION Wiring for automatic control of pump operation, in particular for low-pressure central heating boilers, characterized in that a control selection switch (Ag) is connected to the control phase (R), the first contact (12) of which is connected to the input contact (5) a first relay (K · ^), whose output contact (6) is connected both to the second contact (13) of the switch (Ag) for control selection and to the middle contact (21) of the switch (Aj) for pump selection, 22) is connected to a contactor (Sg) for controlling the operation of the motor of the first pump (M ^) and whose second contact (23) is connected to another contactor (Sj) for controlling the operation of the motor of the second pump (Mg); · ^) Is connected with its input (1) to the electrovalve (EV) and to the transistor relay (TR). 2. The automatic pump control circuit according to claim 1, characterized in that a second relay (Kg) is connected in parallel with the first relay (K ^) between the control selection switch (Ag) and the pump selection switch (Aj). and another relay according to the number of boilers.