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Schematics

2) Heat pump RH

This type of temperature control system uses the relays labels « Heat », « Cool », « Fan ».and « Aux ».

Heat This relay is closed to control the compressor of the heating pump.

Cool This relay controls the reversing valve. It is closed during the heating

process and open during the cooling process.

Fan This relay is closed during the heating and cooling processes

Aux This relay is closed to control an auxiliary heating system (if necessary).

In heating mode and Automatic

If the ambient temperature is lower than the set point, the relay « Heat » is closed.

If the ambient temperature is lower for more than one (1) degree from the set point, the relay « Heat »

and « Aux » are closed.

In cooling mode and Automatic

If the ambient temperature is higher than the set point, the relay « Cool » is closed.

In Auxiliary mode

In this mode, the heat pump is not more used, only the auxiliary heating system is working.

If the ambient temperature is lower than the set point, the relay « Aux » is closed.

3) Heat pump RC

This type of system is identical to type #2. The only difference being for the use of the « Cool » relay. In

opposition to system #2, the « Cool » relay is closed during the cooling process and open during the

heating process.

Connection schematic heat pump

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Secant Cardio IIe Spezifikationen Seite 43