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When Tamb.-Tsupplementary Tset-1 , the unit starts heating operation. In this case, the 4-way valve, compressor and ODU fan
motor run simultaneously; the IDU fan motor will run after a while to prevent blowing cold air.
When Tamb.-Tsupplementary Tset+1 , the compressor and ODU fan motor stop; the 4-way valve remains energized; the IDU fan
motor blows residual heat for a while in set speed.
When Tset-1
Tamb.-Tsupplementary Tset +1 , the unit will maintain its previous running status.
the heating icon is on for a while and then extinguish.
During operation, if the controller detects that Ttube
T
+4
preset
T
+2
preset
T
.
amb
m
i
. n
Compressor
Outdoor unit
Intdoor unit
Set fan speed
min.
Reversing
valve
,
55
Stop
Origi
Start
min.
m
i
. n
min.
Set fan speed
During defrosting,
returns to
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