Service
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145
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'13 • HM-T-193
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) It starts the compressor at 55 rps as target frequency.
b) 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
FDCW71VNX
Cooling 20 4
Heating 40 4
FDCW100VNX
Cooling 20 4
Heating 55 2
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 55
rps as target frequency.
b)
Compressor acceleration nishes,
when pressure difference becomes bigger than 0.34MPa in heating or the low
pressure becomes 0.8MPa in cooling.
c) At 30 seconds after starting compressor, the target frequency changes to
A
rps and the compressor is kept operation
at
A
rps as xed frequency for
B
minutes.
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