Electrical Control Function (Air Handler)
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Electrical Control System
2.3 Heating Mode
2.3.1 In heating mode, the four-way valve is on
2.3.2 The compressor and the four-way valve are controlled by the wired controller. As long as the four-way
valve signal B and compressor signal Y is low level, the system goes into heating mode. Now on the wired
controller, mode switch is in “Heat” and fan switch is in “ON” or “AUTO” position.
2.3.3 The control sketch is as following picture:
Mechanical or Electronic Switch K
FAN
ON
AUTO
Mechanical or Electronic Switch
(When the temperature reaches the setting, switch K is open)
2.3.4 Anti-cold wind protection (Optional)
This function can be active by set the jumper JR1 on the indoor PCB
When T2
≤
TE4, indoor fan will stop; when T2
≥
TE3, indoor fan will re-start. In this protection, compressor
and outdoor fan still work.
2.3.5 Indoor coil high-temperature protection
The temperatures in bracket is the setting temperature when JR1 is connected (the anti-cold wind function is
℃
indoor fan on
TE3
TE4
Indoor fan off
℃
Compressor off
TE8
TE9
TE7
Outdoor fan off
TE10
Compressor and
Outdoor fan on
R
Y
G
B
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