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8-3. DRY operation
1. Compressor
Control modes
Remarks
Control details
Refer to “INDOOR
UNIT CONTROL”
for ON/OFF
judgment method
1-1. Thermoregulating function
The outdoor unit receives information of set temp. and intake temp. from the
indoor unit through transmission and judges the compressor ON/OFF with
thermoregulating function from their temperature difference.
2. Fan
2-1. Normal control
Fan rotation times (rpm) will be controlled according to the outdoor outside temp. (TH7).
• Control method: Inverter control
• Rotation times: Fan step (N) = 0 and 2 to 10
• Comp. Start-up: Fan step is fixed to 9 for 30 seconds after the start-up of compressor.
2-2. Correction of fan step according to the outdoor cond./eva. temperature
Fan step will be corrected according to the outdoor cond./eva. temperature (TH6).
• Correction range of condensing temperature : 19
:
to 62
:
• Correction range of fan step: -1 to +3
2-3. Correction of fan step according to the heat sink temperature
Fan step will be corrected according to the heat sink temperature (TH8)
• Correction range of heat sink temperature: 68
:
to 78
:
• Correction range of fan step: 0 to +2
2-4. Others
Fan also stops when the compressor is being stopped. (Fan step = 0.)
However, fan step will be set to 10 while the compressor is being stopped due
to the abnormal heat sink temperature (Error code = U5). At this time, the
compressor is just waiting 3 minutes to restart.
1-2. Normal control
Same control as that of COOL operation.
1-3. Start-up control
Same control as that of COOL operation.
1-4. Indoor anti-freezing control
Not available
1-5. Outdoor frozen prevention control
Same control as that of COOL operation
1-6. Discharge temperature over-rise prevention control
Same control as that of COOL operation
1-7. Condensing temperature over-rise prevention control
Same control as that of COOL operation
1-8. Heat sink temperature over-rise prevention control
Same control as that of COOL operation.
1-9. Others
Same control as that of COOL operation.
3. LEV
Same control as that of COOL operation.
4. Four way valve
4-1. During normal operation
Always OFF during normal operation.
4-2. Operation mode change
When the mode changes from HEAT to COOL;
Operation mode
Four way valve
COOL
HEAT
ON
OFF
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