Panasonic cs-pa7dkd Service Manual page 26

CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
Deice Control
Deice operation is to protect the outdoor unit from freezing.
Normal Deice Operation
Deicing starts 30 minutes after heating mode operation or 60 minutes after the latest deicing operation. If temperature of
outdoor piping, tested by TRS, falls to -3
Overload Deicing Operation
During heating operation, if the accumulative stopping time of outdoor fan reaches 60 minutes,
deicing operation will start 1 minute after compressor starts.
Deicing operation ends under conditions below
(a) After 12 minutes.
(b) Temperature of outdoor unit rises to 4 .
(c) As the illustration showed bellow and due to Time Delay (Td), deicing won't ends immediately.
Deicing Operation Time(T) Deicing Operation Time(T)
3min 3min
7 min T 9min 7 min T 9min
Once deicing operation starts, it won't end until 60 seconds later.
When deicing operation ends, compressor will stop for 30 seconds, and 4-way valve remains at cooling mode operation
for 10 seconds.
Time Graph for Normal Deicing Operation
a b c d e f g h i
42
34
30
60'
Basic Time
20S 20S
Compressor
Indoor Fan
Outdoor Fan
Operation LED
4-way valve
<Operation status> <Operation status>
a-c Deicing confirmation
c-g Deicing operation(time reset)
h-j,u-w Warm Booting
o-r Deicing(TRS )
(TRS OFF) or below for continuously 50 seconds, deicing operation starts.
3 min 3 min
T 7min T 7min
T 9min T 9min
j k l m n o p q r s t u v w x y z
max60'
max12'
10S 20S 20S 20S
Slo Lo
Time
Td(s) Td(s)
0 0
60 60
120 120
180 180
max60'
max12'
Td 10S 20S
Slo Lo
26
or
Blink
Operation
Stop