Refrigerant Recovery Control; Control Of Outdoor Unit Fan And Outdoor Unit Heat Exchanger Capacity - Mitsubishi Electric PUHY-200YMF-C Service Handbook

(10) Refrigerant recovery control (PU(H)Y-(P)200·250YMF-C)
Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit
under cooling mode and that with heating thermostat being turned off.
1) Start of refrigerant recovery
1 Refrigerant recovery is started when the two items below are fully satisfied.
• 15 minutes has passed after finishing refrigerant recovery.
• The discharge temparature is high.
2) Refrigerant recovery operation
• Refrigerant is recovered by opening LEV of the objective indoor units (indoor units under stop. fan, and cooling
modes, and that with heating thermostat being turned off) for 30 seconds.
LEV opening at refrigerant recovery
(Indoor unit LEV opening 500 pulse)
• The regular capacity control of the outdoor unit and the regular LEV control of the indoor unit are not applied
during refrigerant recovery operation, but are fixed with the value before the recovery operation. These controls will
be conducted one minute after finishing the recovery operation.
• Defrosting operation is prohibited during the recovery operation, and it will be conducted after finishing the recov-
ery operation.

(11) Control of outdoor unit fan and outdoor unit heat exchanger capacity

1 PU(H)Y-200·250YMF-C
1) Control system
Depending on capacity required, control outdoor fan flow rate with phase control, for maintaining evaporation
temperature (0˚C when Pd
operations, and high pressure 18kg/cm
2) Control
• Outdoor unit fan stops when compressor stops.
• Fan is in full operation for 5 seconds after starting.
• Outdoor unit fan stops during defrosting operations.
2 PUHY-P200·250YMF-B, PURY-(P)200·250YMF-C
1) Control system
Depending on capacity required, control outdoor fan flow rate with phase control, for maintaining evaporation
temperature (0˚C) in cooling operations, and high pressure saturated temperature (49˚C) in heating operations.
2) Control
• Outdoor unit fan stops when compressor stops.
• Fan is in full operation for 5 seconds after starting.
• Outdoor unit fan stops during defrosting operations.
LEV opening
before change
Starts
15kg/cm 2 G (1.47MPa), lower than 0˚C when Pd < 15kg/cm
2 G (1.76MPa) in heating operations.
30 seconds
Finish
–62–
2 G (1.47MPa) in cooling