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PG2021 Global HAHU-VP-ECM-005
activated, Indoor fan runs at set speed. EH is turned on. DA3 output is from minimum setting(300016setting) - 10Vdc based
on Delta T3 /T4 and setting;
b) If Tr > Ts+1 ºC then heat operation is terminated, Electrical heater is OFF. Indoor fan is turn OFF after 120S.
c) The range of Ts is 16-30 ºC or fixed according to Parameter 4 setting.
d) Indoor fan speed can be adjusted for low, medium, high and auto.
OVER-HEAT PROTECTION OF INDOOR COIL IN HEAT MODE
a)
If Ti1 ≥ 75 ºC, then MTV1, DA2, MTV2 and EH are turned off, indoor fan runs at high speed, even in standby mode.
b)
If Ti1 < 70 ºC, then unit will maintain its original state.
If Ti1 temperature sensor is damaged, the protection mode will be override.
DEHUMIDIFICATION MODE
a)
Ts=24ºC;
b)
If Tr ≥ 25ºC for 30S, then MTV1 will be ON for 3 minutes, and then OFF for 4 minutes. DA2 is turned on 3times of
minimum opening. Fan is running at auto speed.
c)
If 16ºC≤ Tr < 25ºC, then MTV1 will be ON for 3 minutes, and then OFF for 6 minutes. DA2 is turned on 2 times of
minimum opening. Fan is running at auto speed.
d)
If Tr < 16ºC, then MTV1 will be turned ON for 4 minutes and then OFF for 10 minutes. DA2 is turned on minimum
opening. Fan is running at auto speed.
AUTOMODE
Fan is turned on at medium speed. Check Tr and Ts in 30S;
if Ts>Tr+3ºC for 30S, the unit is turned on in heat mode;
if Tr-3 ºC<Ts<Tr+3 ºC for 30S, the unit is turned on in fan mode;
If Ts<Tr-3 ºC, , the unit is turned on in cool mode;
If the unit working mode is confirmed, it cannot change. After unit is turned OFF for 2 hours, then working mode is reset
again.
4-pipe with modulating valve for EC-S8 (300046=1)
COOL MODE
1) If Tr ≥ Ts +1 ºC, then cool operation is activated, MTV1 is turned on. Indoor fan runs at set speed.
DA2 is open at 10Vdc for 2 min. Then check Ti1,
MS300080=0,
When Ti1<=8ºC, DA2 output is based on water temperature difference (Ti1/Ti2) and Modbus parameter 300027 setting PID
calculation. The output is minimum output (Modbus300015 setting)-10VDc;
When 8<Ti1<=10ºC, DA2 output is based on water temperature difference (Ti1/Ti2) and Modbus parameter 300027 setting
minus 1 PID calculation. The output is minimum output (Modbus300015 setting)-10VDc;
When 10<Ti1<=12ºC, DA2 output is based on water temperature difference (Ti1/Ti2) and Modbus parameter 300027 setting
minus 2 PID calculation. The output is minimum output (Modbus300015 setting)-10VDc;
When 12<Ti1<=15ºC, DA2 output is based on water temperature difference (Ti1/Ti2) and Modbus parameter 300027 setting
minus 3 PID calculation. The output is minimum output (Modbus300015 setting)-10VDc;
When 15<Ti1<=28ºC (Modbus 300017 setting), DA2 output is kept at 10Vdc;
When Ti1>28ºC(Modbus 300017 setting), DA2 output is at minimum (Modbus300016 setting); and report pre-heat alarm;
MS300080=1
DA2 output is based on cooling water flow reading and setting PID calculation. The output is minimum output
(Modbus300015 setting)-10VDc;
MS300080=2
DA2 output is based on cooling pressure difference setting (MS300084) and 4-20mA input2 reading (MS400007) PID
calculation. The output is minimum output (Modbus300015 setting)-10VDc;
2) If Tr < Ts-1ºC, then cool operation is terminated and MTV1 and AUX1 are turned off. DA2 is 0VDC. Indoor fan runs at set
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz
