Panasonic CS-A73KE Service Manual page 22

CS-A73KE
Operation Details
3) Heating Mode Operation
Heating in operation according to Remote Control setting.
Time Delay Safety Control
• When the compressor is stopped by Power Switch or Remote Control, it restarts after 3
minutes when the Power Switch or Remote Control is turned ON.
• When the setting temperature is reached during heating operation, the compressor stops and it will not start for
4 minutes.
Indoor Fan stops for 1 minute after 3 minutes compressor stops. Then, it will operate with Lo – fan speed for 40
seconds then change to SLo fan speed.
Overload Protection Control
• If the temperature of the indoor heat exchanger rises to 51°C, Outdoor Fan stops.
The Outdoor Fan restarts when the indoor heat exchanger temperature falls to 49°C.
• If the indoor heat exchanger becomes 65°C or more, the compressor will stop and restart automatically.
(Time Delay Safety Control – 4 minutes waiting)
Indoor heat exchanger
temperature
Compressor Reverse Rotation
Protection Control
• If the compressor is operating continuously for 5 minutes or longer and temperature difference between intake air
and indoor heat exchanger is 5°C or less for 2 minutes, compressor will stop and restart automatically.
(Time Delay Safety Control is valid).
• Compressor starts for 5 minutes
• ∆ T
5°C for 2 minutes
∆ T = Indoor heat exchanger temperature – intake air temperature
This is to protect reverse rotation of the compressor when there is a instantaneous power failure.
4-way Valve Control
• 4-way valve always ON during Heating operation.(Except Deicing operation)
• When the unit is switched to "OFF" during Heating operation, 4-way valve stays at Heating position for 5 minutes.
Outdoor Fan Motor Control
• When compressor stop (reaches room temperature), outdoor fan will operate for 30 seconds.
(30 seconds Forced Operation).
Hot Start Control
When Heating operation starts, Indoor Fan will not start until the indoor heat exchanger reaches 30°C as diagram
shown.
Indoor heat
exchanger
(°C)
Hot Start is completed when indoor heat exchanger reaches 39°C.
°C
65
1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2
–
Lo
1 2 3 4 5 6 7 8 9 0 1 2
34 1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2 SLo
1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2
30
1 2 3 4 5 6 7 8 9 0 1 2
Indoor Fan
1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2
OFF
1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2
Compressor
OFF
Compressor
OFF
– 21 –
Compressor
restarts
(4 minutes waiting)
Compressor
restarts
(4 minutes waiting)