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Starts
Finish
30 seconds
LEV opening
before change
LEV opening at refrigerant recovery
(Indoor unit LEV opening 500 pulse)
(10) Refrigerant recovery control
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.
• 30 minutes has passed after finishing refrigerant recovery.
• The level detector detects AL = 0 for 3 minutes continuously, or when the discharge SH 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.
• 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 recovery
operation.
(11) Control of outdoor unit fan and outdoor unit heat exchanger capacity
1) Control system
Depending on capacity required, control outdoor fan flow rate with phase control, for maintaining evaporation tem-
perature (0˚C (32°F) when TH6
>
=
20˚C (68°F) , lower than 0˚C (32°F) when TH6<20˚C (68°F) ) in cooling operations,
and high pressure 18kg/cm
2
G (256psi) 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.
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