Service
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137
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'10 • HM-T-149
Operation control function by the outdoor unit controller
5) Minimum required frequency adjustment under outdoor air temperature (Tho-A) condition
According to the outdoor air temperature, minimum required frequency is offset by as per below table.
Model FDCW71VNX FDCW100VNX FDCW140VNX
Cooling mode
A1 0
A2 +15
Heating mode
A3 0 0 0
A4 0 +10 +5
A5 +10 +20 +15
A6 +20 +30 +25
6) When any of the controls from 1) - 5) above may duplicate, whichever the smallest value among duplicated controls is
taken as the maximum required frequency, and whichever the biggest value is taken as the minimum required frequency.
Compressor start control
1) Compressor starts upon receipt of the thermostat ON signal from the indoor unit
2) However, at initial start-up after turning the power circuit breaker on, the compressor may enter the standby state for
maximum 30 minutes in order to prevent from dry-up of oil in the compressor.
Compressor soft start control
1) Compressor protection start I
[Control condition] Normally, the compressor operation frequency is raised in following start pattern.
[Control contents]
a) Start the compressor at
55
rps as target frequency.
For FDCW100VNX, when the outdoor air temperature (Tho-A) is 35°C or higher during cooling or inlet water
temperature (Twin) is 48°C or higher and outdoor air temperature is 0°C or higher during heating, it starts at
C
rps.
b) For FDCW71VNX and FDCW140VNX, compressor speed acceleration nishes when the pressure difference
becomes bigger than 0.34MPa in heating or when the low pressure reaches 0.8MPa in cooling.
c) At 30 seconds after starting compressor, the target frequency changes to
A
rps and compressor is kept operation at
A
rps as xed frequency for
B
minutes.
Model Operation Mode A rps B min C rps
FDCW71VNX
Cooling 20 4 −
Heating 40 4 −
FDCW100VNX
Cooling 55 4 30
Heating 55 2 30
FDCW140VNX
Cooling 20 4 −
Heating 40 4 −
2) Compressor protection start II
[Control condition] The initial start-up of compressor after turning the power supply ON
[Control contents] According to the operation mode and the outdoor air temperature (Tho-A), the outdoor unit starts the
compressor with the following control.
a) It starts the compressor at 55rps as target frequency.
For FDCW100VNX, when the outdoor air temperature (Tho-A) is higher than 35°C in cooling or Twin is 48°C or
higher in heating, it starts at
C
rps.
b) For FDCW71VNX and FDCW140VNX, compressor acceleration finishes, when pressure difference becomes
bigger than 0.34MPa in heating or the low pressure becomes 0.8MPa in cooling
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