External Underfloor Heating Control; Active Cooling Function - nilan Compact P2 Installation Instructions Manual

External underfloor heating control

To avoid the heat pump producing heat when there is no need for it, it is advisable to connect the underfloor heating control on the
telestats to AIR.
A screw terminal is mounted on the connections panel for controlling heating/cooling. The loop, which is in HEAT and COM, is removed
and the signal from the floor heating control is connected here. Closed contact set: heating requiret! Open contact set: no heating re-
quired!
The circulation pump for floor heating can also beneficially be connected to the external heating control.

Active cooling function

The AIR unit has a reversible cold circuit, which means that it can be used to actively cool the home, using either the floor heating sys-
tem or fan coils.
CAUTION
If it is wished to operate with cooling, it is important to use glycol in the brine circuit to avoid icing in the heat pump.
Active cooling using the floor heating
There is an external temperature sensor connected to digital input D3. When the switch is activated, the AIR unit goes into cooling
mode and cools the home down to a pre-set value. When the switch is deactivated, the AIR unit returns to normal operation.
The external temperature sensor often has an infra-red sensor, which measures the temperature of the floor and stops the cooling
function before condensation forms on the floor.
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