32
PG2021 Global HAHU-VP-ECM-005
If the float switch (N/C) is opened before the unit is turned on and if running at COOL mode, then MTV1 is turned off. The
drain pump will be turned on and indoor fan will keep running. After float switch is closed, MTV1 is turned on.
If the unit is turned on in COOL mode and the float switch is opened continuously ≥ 5 seconds, then the drain pump will be
turned on and MTV1 will remain off. After the float switch is closed, the drain pump will run for an additional 5 minutes. If the
float switch is opened for 10 minutes continuously, then MTV1 will remain off and the indoor fan runs at set speed and the
system will report an error signal.
If the unit is off and the float switch is opened, then the drain pump will be turned on. After the float switch is closed, the
drain pump will run for an additional 5 minutes. If the float switch is opened for 10 minutes continuously, then the system will
report an error signal.
EH PROTECTION SWITCH
1.
If EH protection switch is closed for 30s and Fan is ON, then EH is ON.
2.
When EH is ON, EH protection is open for 1s, or Fan is OFF, EH will be turned OFF at once and report alarm.
3.
When EH protection switch is closed for 180s, EH will be turned ON again.
4.
If EH protection switch is opened 3 times in 1 hour, EH will not be turned ON again except main power reset.
LOW TEMPERATURE PROTECTION OF INDOOR COIL IN WINTER
This is frost protection when the unit is off to prevent water from freezing in the coil.
If a 2-pipe system is in Standby Mode, when Tr
≦
2 ºC for 2 minutes, MTV1 is turned on. AUX2 is on. DA2 is 5VDC. If Ti1 < 5ºC
for 2 minutes, EH (if installed) is switched on. Indoor fan is turned on at low speed. If Tr
≧
5ºC for 2 minutes, MTV2 is turned
off. AUX2 is off. DA2 is 0VDC. EH (if installed) is turned off. Indoor fan is switched off.
If a 4-pipe system (or 2-pipe unit with 6-way valve) is in Standby Mode, when Tr
≦
2 ºC for 2 minutes, MTV2 is turned on.
AUX2 is on. DA3 is 5VDC (DA2 is 8VDC if using 6-way valve). If Ti1 < 5ºC for 2 minutes EH (if installed) is switched on. Indoor
fan is turned on at low speed. If Tr
≧
5ºC for 2 minutes, MTV2 is turned off. AUX2 is off. DA3 is 0VDC (DA2 is 5VDC if using 6-
way valve). EH (if installed) is turned off. Indoor fan is switched off.
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz
