Page 54 of 83
SK2018 PCG(H)-V/P-AECM-001
D.4.2.
Without Valve Configuration
COOL MODE
a)
Electric heater, AUX1, MTV1 and MTV2 are always off.
b)
If Tr ≥ Ts + 1.8ºF (or + 7.2ºF if economy contact is activated), then cool operation is activated and AUX2 is turned
on. Indoor fan runs at set speed.
c)
If Tr < Ts, then cool operation is terminated and AUX2 is turned off. Indoor fan is turned off.
d)
The range of Ts is 60.8 - 86ºF
e)
Indoor fan speed can be adjusted to low, medium, high and auto.
Note: When the unit is turned off, the indoor fan shut down after 5 seconds.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a)
If Ti1 ≤ 35.6ºF for 2 minutes, then AUX2 is turned off. If low speed is selected via user interface, then indoor fan
runs at medium speed. If medium or high speed is selected via user interface, then indoor fan runs at set speed.
b)
If Ti1 ≥ 41ºF for 2 minutes, then AUX2 is turned on. Indoor fan runs at set speed.
FAN MODE
a)
Indoor fan runs at the set speed while heater, AUX1, AUX2, MTV1 and MTV2 are turned off.
b)
Indoor fan speed can be adjusted to low, medium and high.
HEAT MODE
Heat mode without electrical heater
a)
MTV1, MTV2, AUX2 and heater are always off.
b)
If Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is activated), then heat operation is activated and AUX1 is turned
on. Indoor fan runs at the set speed.
c)
If Tr > Ts, then heat operation is terminated and AUX1 is turned off. Indoor fan runs at Modbus 310000 setting.
d)
The range of Ts is 60.8 - 86ºF.
e)
Indoor fan speed can be adjusted to low, medium, high and auto.
Heat mode with electrical heater as booster
a)
MTV1, MTV2 and AUX2 are always off.
b)
If Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is activated), then heat operation is activated and AUX1 is turned
on. Indoor fan runs at the set speed.
c)
If Tr > Ts, then heat operation is terminated and AUX1 is turned off. Indoor fan runs at Modbus 310000 setting.
d)
If Ti1 < 104ºF, then the electrical heater is turned on. If 104ºF ≤ Ti1 < 113ºF, then the electrical heater maintains
its original state. If Ti1 ≥ 113ºF, then the electrical heater is turned off.
e)
The range of Ts is 60.8 - 86ºF.
f)
Indoor fan speed can be adjusted to low, medium, high and auto.
Heat mode with electrical heater as primary heat source
a)
MTV1, MTV2 and AUX2 are off.
b)
If Ti1 < 96.8ºF [or 82.4ºF is selected by DIPB-S2 position SW4], then AUX1 is on while indoor fan remains off.
c)
If Ti1 ≥ 100.4ºF [or 86ºF is selected by DIPB-S2 position SW4], then AUX1 is on while indoor fan runs at set
speed.
d)
If the indoor coil temperature sensor is damaged, then the pre-heat time is set for 2 minutes. Indoor fan runs
at set speed.
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