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PG2021 CHV2-VP-ECM-V2
With Electrical Heater as booster
（
Modbus300047=1
）
When unit is turned on in heating mode.
When Tr ≤ Ts - 1 ºC (Modbus 300033 setting), MTV1 and AUX2 is turned on. Fan is turned on at setting speed. DA2 is at
10 VDC for 2 minutes, then check Ti1:
If Ti1 < 28ºC (Modbus 300017 setting), EH is turned on. DA2 is at 10 VDC.
If 28ºC<Ti1< 28
（
Modbus 300017 setting
）
+4ºC, EH is kept at original state. DA2 is at original state.
If Ti1 ≥ 28
（
Modbus 300017 setting
）
+4ºC, EH is turned off. DA2 output is based on water temperature difference
(Ti1/Ti2) and Modbus parameter 300028 setting PID calculation. The output is minimum output (Modbus300015 setting)
~10 VDC.
If Ti1 sensor is damaged, fan runs at setting speed.
When Tr > Ts + 1ºC (Modbus 300033 setting), MTV1 and AUX2 is turned off. EH is turned off. DA2 is at 0 VDC. fan is
turned on at low speed.
When unit is turned off,
MTV1 and AUX2 is turned off. DA2 is at 0 VDC. Fan is turned off delaying 2 minutes.
With Electrical Heater as booster
（
Modbus300047=2
）
When unit is turned on in heating mode.
When Ti2 ≤ 35ºC (or Ti2 is broken) and Tr ≤ Ts - 1 ºC (Modbus 300033 setting), Fan is turned on at setting speed, EH
is turned on.
When Tr > Ts ºC, EH is turned off. fan is turned on at low speed.
When unit is turned off,
EH is turned off. 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 on at 3 times of (Modbus
300016 setting). 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 on at double of
(Modbus 300016 setting). 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 on at (Modbus 300016
setting). Fan is turned on at low speed.
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 working mode is confirmed, the unit will not change the working mode. After the unit is turned off and
restart it in 2 hours, working mode will be confirmed again.
PRO INPUT FUNCTION
When 100004=0
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: [email protected] Web: www.cookeindustries.co.nz
