Polar Air SWC-04-ECM, Installation, Operating & Service Manual

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PG2021_SWC-V-ECM_02

If Ti1 sensor is damaged, fan runs at setting speed.

When Tr > Ts+ 1ºC (Modbus 300033 setting), MTV2 and AUX2 is turned off. EH is turned off. DA2 is at 5VDC. fan is turned
on at low speed.

When unit is turned off, MTV2 and AUX2 is turned off. DA2 is at 5 VDC. Fan is turned off delaying 2 minutes.
OVER-HEAT PROTECTION OF INDOOR COIL

If Ti1 ≥ 75ºC, then MTV1, AUX2, DA2 and EH are turned off. Indoor fan remains on and runs at high speed.

If Ti1 < 70ºC, then unit keep original state.

If the indoor coil temperature sensor is damaged or not connected, then the protection mode will be overridden and the
unit will work according to the pre-heat and post-heat program.
DEHUMIDIFICATION MODE
When unit is turned on in dehumidification mode:

AUX1 is turned on. Ts is 24 ºC.

If Tr ≥ 25ºC for 30S, then MTV1 will be ON for 3 minutes, and then OFF for 4 minutes. DA2 is 2VDC. Fan is turned on at
low speed.

If 16ºC ≤ Tr < 25ºC for 30S, then MTV1 will be ON for 3 minutes, and then OFF for 6 minutes. DA2 is 2.5VDC. Fan is turned
on at low speed.

If Tr < 16ºC for 30S, then MTV1 will be ON for 3 minutes, and then OFF for 10 minutes. DA2 is 3.5VDC.

At the end of the above dehumidification cycle, the system will decide the next dehumidification control option.
AUTO MODE
When unit is turned on in Auto mode, fan is turned on at setting speed for 30S, then check Tr and Ts:

If Ts>=Tr+3 ºC, the unit runs in heating mode.

If Tr-3 ºC<Ts<Tr+3 ºC, the unit runs in fan mode.

If Ts<Tr-3 ºC, the unit runs in cooling mode.

If unit works in heating or fan mode, when Tr-Ts>3.0ºC, MTV2, MTV1 and DA2 is off for more than 10minutes. EH is off
for more than 10 minutes, the unit will work in cooling mode.

If unit works in cooling or fan mode, when Ts-Tr>3.0ºC, MTV2, MTV1 and DA2 is off for more than 10minutes. The unit
will work in heating mode.
PRO INPUT FUNCTION
The unit is on:

PRO input is closed for 60S, the unit is turned off.

PRO input is open for 60S, the unit is turned on.
Cooke Industries - Phone: +64 9 579 2185 Email: sales@cookeindustries.co.nz Web: www.cookeindustries.co.nz