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SK2016 HW-V-AECM-001
D.4.
Control Logics For 2-Pipe System
D.4.1.
With Thermoelectric Valve Configuration
COOL MODE
a)
MTV2, AUX1 and 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, then cool operation is terminated and MTV1 and AUX2 are turned off. 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, it will
run at medium speed. If it is set at medium or high speed, 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
Without Electrical Heater
a)
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
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
200RPM.
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 requires120 seconds before it is fully closed.
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
200RPM.
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.
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.
