The refrigerator controls the heating of the house. Scheme, description

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The refrigerator controls the heating of the house. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power regulators, thermometers, heat stabilizers

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To heat water in the batteries of the heating system, the author uses an automatic gas water heater AGV-80. To improve circulation from the water heater to the batteries, a circulation pump is installed in the return pipe, which equalizes the temperature of the water in the batteries with the heated water in the water heater in 5 ... 6 minutes, after which it can be turned off for 20 ... 25 minutes, and then turned on again for 5.6 minutes, etc. This mode of operation increases the durability of the pump motor, reduces electricity consumption and increases the efficiency of the heating system.

(click to enlarge)

As it turned out, the compressor in the existing refrigerator turns on at about the same frequency. Using this fact, a device was developed, the circuit of which is shown in the figure. As you can see, a resistor R1 is introduced into the power circuit of the refrigerator, on which, when the compressor is operating (the current it consumes is approximately 0,5 A), an alternating voltage drop of about 2 V is created. This voltage is applied to the primary winding of a low-power step-up transformer T1. An alternating voltage of about 12 V induced on its secondary winding is rectified by a diode bridge VD1. The pulsating voltage from it is supplied to the control electrode of the trinistor VS1 and opens it, thereby closing the power supply circuit of the pump motor. Thus, every time the compressor of the refrigerator is turned on, the pump is also turned on, which runs all the time that the compressor is turned on.

An increase in the clarity of turning the pump on and off was achieved by using positive feedback, which consists in the fact that the current it consumes passes through the same resistor R1. In other words, when the pump is turned on, the voltage drop across this resistor increases, and, consequently, the voltage supplied to the control electrode of the trinistor, which increases the reliability of keeping it in the open state. When the compressor is turned off, when the current through the resistor R1 decreases several times, the voltage drop across it becomes insufficient to create a voltage transformer on the secondary winding that can keep the trinistor open, and it closes, turning off the pump. The indicator for turning on the pump is the HL1 LED, which goes out when the trinistor is opened. Resistor R2 limits the current through it when the pump is off at a level of approximately 1 mA.

In series with the trinistor, a DC ammeter PA1 with a measurement limit of 0,6 A is connected to the pump power circuit. Since the pump used has a three-position power switch, depending on its position, the ammeter shows a current of 0,1; 0,15 or 0,2 A, which allows you to judge the actual power of the pump at the moment and, if necessary, optimize it in relation to the temperature of the water in the water heater.

If it is necessary for the pump to work constantly, for example, when severe cold sets in, the two-pole switch SA1 is moved to a position in which its contacts short-circuit the resistor R1 and the diagonal of the diode bridge VD2-VD5.

Transformer T1 - output from a transistor radio (depending on its brand, the transformation ratio can be in the range from about 4 to 7). As winding I, its secondary winding is used, and windings II are used as primary (the tap from its midpoint is left free). Trimmer resistor R1 - wire PEV-R with a power dissipation of at least 3 W, constant R2 and R3 - any type of power indicated in the diagram. Dual switch SA1 - bipolar toggle switch TP1-2 or similar. We can replace the AL307BM LED with any other, preferably with increased brightness. Establishing the device comes down to selecting such a minimum resistance of the resistor R1, at which the device reliably turns on the pump when the mains voltage in the area is minimal.

The described device has been working flawlessly for the author for the second year.

Author: V. Davydov

See other articles Section Power regulators, thermometers, heat stabilizers.

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