(4) Emergency mode operation from the outdoor unit PCB for a compressor failure (only for RAS-(20-54)FSXN)
Place contact
1 or contact 2 of DSW5 to the ON position to stop the compressor. Once positioned, all the compressors of
the failed outdoor unit will not be operated.
(DSW5)
DSW5 Compressor
1 Inverter Compressor
2 Constant Speed Compressor 1
Set control PCB1 in the failed outdoor unit.
<Outdoor Unit PCB1>
Compressor
Compressor
Compressor
Even if one unit is failed, the others can operate continuously.
Failed Outdoor Unit
N O T E
Heat pump system (2 pipes):
Completely close the stop valves (gas/liquid) in the failed outdoor unit.
• Operating condition:
< Operating capacity of the indoor units >
The compressor is forced to stop for its protection under the following conditions:
Total capacity of Thermo ON indoor unit: < 50% capacity of the outdoor unit.
Total capacity of Thermo ON outdoor unit < 10 HP.
The lack of
Thermo ON in the indoor unit can cause a failure of the constant speed compressor because it gets turned on
and stops repeatedly.
N O T E
• Measure the insulation resistance of the Inverter compressor.
Do not activate the emergency operation when the insulation resistance is 0 Ω.
Another compressor may suffer damage due to the possibility that refrigerant oil may be oxidized.
• The total operating capacity of the indoor units should be 10 HP and greater.
Less than 10 HP: forced stoppage.
• In emergency operation, the compressor frequency can not normally be controlled.
Consequently, alarm codes “07”, “43”, “44”, “45” or “47” can be displayed on the LCD.
• The emergency operation cannot provide sufficient cooling and heating capacity.
8 Troubleshooting
157
SMGB0065 rev. 1 - 12/2010
8
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