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Schematics

4) HVAC

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

Heat This relay is closed to control the heating.

Cool This relay is closed to control the cooling.

Fan This relay is closed either during cooling and heating control processes

Aux This relay is closed to control the auxiliary unit

In heating mode and Automatic

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

When the ambient temperature is lower more than three (3) degree from the set point, the « Heat » and

« Aux » relays are closed.

In cooling mode and Automatic

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

Connection schematic HVAC

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Secant Cardio IIe Especificaciones Pagina 44