Sub Cool Control; Deice Control - Panasonic S-22KA1E5S Service Manual

13.4 Sub Cool Control

Sub Cool Control only will operate during cooling mode with below conditions are fulfilled :
- Cooling Operation.
- Outdoor air temp > - 5°C.
- Outdoor high pressure sensor temp value > 27°C.
- Total Operating Indoor capacity > 1.6HP.
Due to Super heat is happened, Sub Cool Expansion Valve more opening if below condition happened :-
(Bypass Pipe Temp – Low Pressure Sensor Temp Value) – Target
Due to Present of Sub Cool, Sub Cool Expansion Valve less opening if below condition happened :-
(Hi Pressure Sensor Temp Value – SC Pipe Temp) – Target
Sub Cool Expansion Valve is full close when above conditions not fulfilled.

13.5 Deice Control

•
This control will operate for 1 cycle after accumulation time for heating (Compressor ON) under low outdoor
ambient environment as stated in table below:
Outdoor Air Temperature (°C)
-3 & above
-3 to -10
Below -10
•
During deice control, for indoor units in ON condition:
Indoor fan OFF
o
Power LED blinking
o
Expansion valve fully opened
o
•
During deice control, for indoor units in OFF condition:
Expansion valve fully opened
o
•
Deice control start condition:
T rigg e r
C ond itio n
O N
Defrost
O F F
Compressor
30 H z
O N
4 Way Valve
O F F
Outdoor Fan
Outdoor Expansion Valve
Sub Cool
Expansion Valve
Gas Bypass Valve
Liquid Bypass Valve
Indoor Expansion Valve
Indoor Fan
1k
DEF_Th
3 k
Heat exchanger temperature (°C)
80 H z
O F F
480 p u lse (fu ll open )
O N
O N
N o rm a l
480 p u lse (fu ll open )
S to p
-5 to -7
-7 or below
-10 to -12
-12 or below
-15 to -22
-22 or below
C on tro l
R e se t
60 H z
50 H z
30 H z
60 sec
176
Acc. Time (minutes)
75
45
100
55
115
85