30
PG2021 Global HAHU-VP-ECM-005
If unit is working at cool mode or Fan mode, if Ts-Tr>3.0ºC, MTV2 , MTV1 and DA2 are OFF more than 3 minutes, working
mode will be changed to heating mode;
2-pipe with 6-way valve unit for EC-S8 (300046=2)
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 0Vdc 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 4-0VDc;
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 4-0VDc;
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 4-0VDc;
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 4-0VDc;
When 15<Ti1<=28ºC (Modbus 300017 setting), DA2 output is kept at 0Vdc;
When Ti1>28ºC(Modbus 300017 setting), DA2 output is 4Vdc; 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 The output is
4-0VDc;
MS300080=2
DA2 output is based on cooling pressure difference setting (MS300084) and 4-20mA input2 reading (MS400007) PID
calculation. The output is 4-0VDc.
2) If Tr < Ts-1 ºC, then cool operation is terminated and MTV1 is turned off. DA2 is 5VDC. Indoor fan runs at set speed.
3) The range of Ts is 16 - 30 ºC .
4) Indoor fan speed can be adjusted for low, medium, high and auto.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a)
If Ti1 ≤ 2 ºC for 2 minutes, then MTV1 is turned off.DA2=5VDC; If indoor fan is set for low speed, then it will run at
medium speed. If it is set at medium or high speed, then it will keep running at the same speed.
b)
If Ti1 ≥ 5ºC for 2 minutes, then MTV1 is turned on. DA2 is calculated by Delta T; Indoor fan runs at set speed.
FAN MODE
a.
Indoor fan runs at the set speed while heater, MTV1, MTV2 are turned off.
b.
Indoor fan speed can be adjusted to low, medium and high.
HEAT MODE
Heat mode without electrical heater (300047=0)
b)
If Tr ≤ Ts - 1 ºC, then heat operation is activated and MTV2 is turned on. DA2 is open at 10Vdc for 2 min. Then check Ti1.
MS300080=0,
If Ti1<=28ºC (300017 setting), fan is turned on at low speed; DA2 is on at 10VDC;
If 28ºC (300017 setting)<Ti1<28
（
3000017 setting
）
+4ºC, fan and DA2 are kept original state;
If Ti1 ≥ 28
（
3000017 setting
）
+4ºC, fan runs at set speed. DA2 output is from 6 - 10Vdc based on Delta Ti1/Ti2 and setting; if
Ti sensor is damaged, Fan runs at set speed.
MS300080=1
DA2 output is based on heating water flow reading and setting PID calculation. The output is from 6-10VDc;
MS300080=2
DA2 output is based on heating pressure difference setting (MS300085) and 4-20mA input2 reading (MS400007) PID
calculation. The output is from 6-10VDc;
b) If Tr > Ts+1 ºC, then heat operation is terminated and MTV1 is turned off. DA2 is 5VDC. Indoor fan is turned OFF.
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz
