Ballu KFR-28GW/BP Series, Service Manual

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7.CONTROL MODE
(6) Control of electronic expansion valve
Primary valve openness control, overheat control, exhaust control and capacity control.
(7) Defrost run
A.
The defrost run is carried out by reversing the heating cycle.
B. Conditions for entering the defrost run:
The heating run has last for at least 30 minutes;
Other conditions (to be added in)
C. Defrosting procedures:
Both compressor and outdoor fan motor stop.
50 seconds later, the 4-way valve is shut down.
Another 5 seconds later, the compressor gets started.
When the defrost conditions are met, or the compressor has been running for over 6 minutes, the
compressor stops and the defrosting ends.
(8) Overload protection for indoor heat exchanger
Tindoor coil pipe 65 , the compressor stops;
The indoor heat exchanger temperature 56 , the outdoor airflow rate is switched
Over to the low airflow rate, and the compressor frequency drops;
56 the indoor heat exchanger temperature 53 , the compressor frequency
Is prohibited from ascending.
5. Air-freshening mode
Under the air-freshening run, the indoor fan motor runs according to the airflow rate setting on the remote
controller.
a. Model KFR-28GW/BPx2/2801 GW/BPx2
Low: 900 rpm Medium: 1,100 rpm High: 1,200 rpm High efficiency: 1,300 rpm
b. KFR-2601 GW/BPx2
Low: 1,350 rpm Medium : 1,500 rpm High: 1,600 rpm High efficiency: 1,700 rpm
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Automatic
T
temperature set ting
-
T
room temperature
Airflow
Rate
T
temperature set ting
-
T
room temperature
Airflow
Rate
1
Low
1
Low
2
Medium
2
Low
3
Medium
3
Medium
4
Medium
4
Medium
D
ir
ec
ti
o
n
o
f
T
em
p
er
at
u
re
D
if
fe
re
n
ce
5
High
D
ir
ec
ti
o
n
o
f
T
em
p
er
at
u
re
D
if
fe
re
n
ce
D
if
fe
re
n
ce
5
Medium
6
High
6
High
°Ñ
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