Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 56

8-3. DRY operation
Control modes
1-1. Thermoregulating function
1. Compressor
1-2. Normal control
1-3. Start-up control
1-4. Indoor anti-freezing control
1-5. Outdoor frozen prevention control
1-6. Discharge temperature over-rise prevention control
1-7. Condensing temperature over-rise prevention control
1-8. Heat sink temperature over-rise prevention control
1-9. Others
2-1. Normal control
2. Fan
2-2. Correction of fan step according to the outdoor cond./eva. temperature
2-3. Correction of fan step according to the heat sink temperature
2-4. Others
Same control as that of COOL operation.
3. LEV
4-1. During normal operation
4. Four way valve
4-2. Operation mode change
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.
Same control as that of COOL operation.
Same control as that of COOL operation.
Not available
Same control as that of COOL operation
Same control as that of COOL operation
Same control as that of COOL operation
Same control as that of COOL operation.
Same control as that of COOL operation.
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.
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
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
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.
Always OFF during normal operation.
When the mode changes from HEAT to COOL;
COOL
Operation mode
HEAT
ON
Four way valve
OFF
Control details
56
Remarks
Refer to "INDOOR
UNIT CONTROL"
for ON/OFF
judgment method