Panasonic CS-F24DD2E5 / CS-F28DD2E5 / CS-F34DD2E5 / CS-F43DD2E5 / CS-F50DD2E5 / CU-L24DBE5 / CU-L28DBE5 / CU-L34DBE5 / CU-L43DBE5 / CU-L50DBE8 Service Manual ▷ View online
9.7. Outdoor fan remaining heat removal control
• When compressor stop, outdoor fan operate for 1 minute to remove the remaining heat.
9.8. Crank case heater control
• Crank case heater power is on to prevent the refrigerant solving into compressor oil inside of the compressor shell at cold
condition.
• When below conditions are satisfied, crank case heater power on.
− Compressor stop
− Outdoor temperature
− Outdoor temperature
15°C
− Compressor discharge temperature
15°C
9.9. Valve error
• When install the air conditioner unit and try to start forced operation (cooling mode) after completion the installation, in case of
3 way valve close, valve error displayed at the wired remote controller to protect the compressor.
• This error can be detected to satisfy below condition, when power is on at first time and within 7 minutes from compressor start.
(However, it is judged that power on is the first time until compressor start operating continuously for 7 minutes)
− Indoor heat exchanger temperature when compressor start - 3K < current indoor heat exchanger temperature for 5 minutes
− Indoor suction temperature - 3K < current heat exchanger temperature for 5 minutes.
− Indoor suction temperature - 3K < current heat exchanger temperature for 5 minutes.
9.10. Pump down operation
• When pushing the [PUMP DOWN] button on the outdoor PCB for 1 second, pump down operation start. Detail of pump down
operation is shown at below table.
• During pump down operation, push the [PUMP DOWN] button once again for 1 second, pump down operation stop.
• After 600[Sec] past, pump down operation stop.
• After 600[Sec] past, pump down operation stop.
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10.1. Pipe length
10 INSTALLATION INSTRUCTION
10.1.1. Correction of capacities
Correction of capacities according to the connecting pipe length.
The data of rated capacities (marked on the name plate) are based on 7.5 metres connecting pipe and horizontal
installation.
The data of rated capacities (marked on the name plate) are based on 7.5 metres connecting pipe and horizontal
installation.
Piping Size / Length & Elevation
Model No.
Piping size
Piping
length
length
(A)
Piping
elevation
(B)
Piping
elevation
(C)
Piping
Chargeless
Add
Refrigerant
Liquid /
High
Valve
Gas /
Low
Valve
Max (m)
Max (m)
Max (m)
Max (m)
(g/m)
R
CS-F24DD2E5
HIDE
4
CS-F28DD2E5
AWAY
1
(Me)
CS-F34DD2E5
9.52
3-ways
15.88
3-ways
50
30
20
30
50
TYPE
0
CS-F43DD2E5
A
CS-F50DD2E5
Note :
Piping elevation B = outdoor unit installed at top
Piping elevation C = outdoor unit installed at bottom
• Calculation 1
In case of CU-L28, 34DBE5
When pipe length exceed 30m calculated by formula 1, adding refrigerant amount should be calculated by formula 2. If
calculation result is less than 30m, it is not necessary to add refrigerant.
calculation result is less than 30m, it is not necessary to add refrigerant.
Pipe length = main pipe + (branch pipe La + branch pipe Lb)/2.78...formula 1
Add refrigerant = (main pipe + (branch pipe La + branch pipe Lb)/2.78-30) * 50...formula 2
• Calculation 2
In case of CU-L43, 50DBE8
When pipe length exceed 30m calculated by formula 3, adding refrigerant amount should be calculated by formula 4. If
calculation result is less than 30m, it is not necessary to add refrigerant.
calculation result is less than 30m, it is not necessary to add refrigerant.
Pipe length = main pipe + branch pipe La + branch pipe Lb...formula 3
Add refrigerant = (main pipe + branch pipe La + branch pipe Lb-30) * 50...formula 4
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