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SK2018 PCG(H)-V/P-AECM-001
D.4.
Control Logic For 2-Pipe System
D.4.1.
With Valve Configuration
COOL MODE
a)
MTV2, AUX1 and electric heater are always off.
b)
If Tr ≥ Ts + 1.8ºF (or + 7.2ºF if economy contact is activated), then cool operation is activated and MTV1 and
AUX2 are turned on. Indoor fan runs at set speed.
c)
If Tr < Ts, cool operation is terminated and MTV1 and AUX2 are turned off. Then indoor fan runs at set speed.
d)
The range of Ts is 60.8 - 86ºF
e)
Indoor fan speed can be adjusted to low, medium, high and auto.
f)
When turned on, MTV1 requires 30 seconds before it is fully open.
g)
When turned off, MTV1 requires 120 seconds before it is fully closed.
h)
When the unit is turned off, the indoor fan will shut down after 5 seconds.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a)
If Ti1 ≤ 35.6ºF for 2 minutes, then MTV1 and AUX2 are turned off. 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 ≥ 41ºF for 2 minutes, then MTV1 and AUX2 are turned on. Indoor fan runs at set speed.
FAN MODE
a)
Indoor fan runs at the set speed while heater, MTV1, MTV2, AUX1 and AUX2 are turned off.
b)
Indoor fan speed can be adjusted to low, medium and high.
HEAT MODE
Heat mode without electrical heater
a)
MTV2, AUX2 and electric heater are always off.
b)
If Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is activated), then heat operation is activated and MTV1 and
AUX1 are turned on. Indoor fan runs at the set speed.
c)
If Tr > Ts, then heat operation is terminated and MTV1 and AUX1 are 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.
f)
When turned on, MTV1 requires 30 seconds before it is fully open.
g)
When turned off, MTV1 requires 120 seconds before it is fully closed.
Heat mode with electrical heater as booster
a)
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 MTV1 and
AUX1 are turned on. Indoor fan runs at the set speed.
c)
If Tr > Ts, then heat operation is terminated and MTV1 and AUX1 are 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 for low, medium, high and auto.
g)
When turned on, MTV1 requires 30 seconds before it is fully open.
h)
When turned off, MTV1 requires 120 seconds before it is fully closed.
Heat mode with electrical heater as primary heat source
a)
MTV1, MTV2, and AUX2 are always off
b)
If Ti2 ≤ 86ºF (or Ti2 is damaged or disconnected), AND if Tr ≤ Ts - 1.8ºF (or - 7.2ºF if economy contact is
activated), then heat operation is activated and the electrical heater and AUX1 are turned on. Indoor fan runs
at set speed.
c)
If Tr > Ts, then heat operation is terminated and the electrical heater and AUX 1 are turned off. Indoor fan
runs at Modbus 310000 setting.
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