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7
INDOOR UNIT CONTROL
7-1. COOL operation
Control modes
1-1. Thermoregulating function (Function to prevent restarting for 3 minutes)
1. Compressor
• Room temperature ] desired temperature +1:···Compressor ON
• Room temperature [ desired temperature ···Compressor OFF
Crankcase heater: OFF when compressor operates
Crankcase heater switches ON when 220-240V AC current is applied between
connectors CH 1 and 2 on the outdoor control board.
1-2. Anti-freezing control
Detected condition : When the liquid pipe temperature (TH2 ) or Condenser/
Released condition : The timer which prevents reactivating is set for 3 minutes,
1-3. Frozen protection
Detected condition : 1 When the indoor pipe temperature (TH2 ) or Condenser/
Detected condition : 2 In case the indoor unit continues to be under the anti-freezing
Released condition : When the operation stops by the remote controller operation.
By the remote controller setting (switch of 4 speeds or 2 speeds)
2. Fan
When determining the abnormality of the pipe temp. low speed fan is fixed.
w2 Compare liquid pipe temperature to Condenser/ Evaporator temperature, and the lower one is applied to anti-freezing control.
• Liquid pipe temperature [ Condenser/ Evaporator temperature····· Liquid pipe
• Liquid pipe temperature > Condenser/ Evaporator temperature····· Condenser/ Evaporator pipe
w3 The function of remote controller can change the temperature to start anti-freezing control.
Control details
ON when compressor stopped (including when thermostat is OFF)
Evaporator temperature (TH5 ) (w3) is 2: or less (w4) in 16
minutes from compressors start up, anti-freezing control
starts and the compressor will be suspended.
and anti- freezing control is cancelled when any one of the
following conditions is satisfied.
1 Liquid pipe temperature (TH2) and Condenser / Evaporator
temperature (TH5) turn 10: or above.
2 The condition of the compressor stop has become
complete by thermoregulating, etc.
3 The operation modes became mode other than COOL.
4 The operation stopped.
Evaporator temperature (TH5 ) continues -15: for 3 minutes
since 3 minutes has passed after the compressor start, the
compressor stops and then the mode changes to prevent
restarting for 6 minutes. After restarting of 6 minutes, when
the indoor pipe temp. (TH2) or Condenser / Evaporator
temperature (TH5) continues -15 or less for three minutes again
by the time 16 minutes have passed, the frozen protection
operates. (P6)
control for 9 minutes or more, the unit will be in a state of the
suspensive abnormality. Restart the compressor after releasing
the anti-freezing control. The suspensive abnormality will be
cancelled if the compressor keeps operating for 20 minutes.
However, the suspensive abnormality will turn into the
abnormality if the anti-freezing control works again for 9
minutes during that period. On the other hand, the suspensive
abnormality will be cancelled if the anti-freezing control
works for less than 9 minutes
Fan speed notch
Type
[Low] [Medium2] [Medium1] [High]
4 speeds type
2 speeds type
[Low]
39
[High]
Remarks
w1 The thermoregulating
function is provided in the
outdoor unit.
The indoor unit transmits
the indoor room
temperature and set
temperature data to
outdoor unit, then the
outdoor unit controls
thermoregulation.
Refer to w2.
Refer to w3.
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