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When installed the power source to the unit has been cut for an extended period,
the insulation resistance may drop below 1 M" due to the accumulation of refrigerant
within the compressor. This is not a malfunction. Perform the following procedures.
1. Remove the wires from the compressor and measure the insulation resistance of
the compressor.
2. If the insulation resistance is below 1 M", the compressor may be faulty or simply
the accumulation of refrigerant in the compressor makes the resistance drop.
3. After connecting the wires to the compressor, the compressor starts to warm up
once power is supplied. After supplying power for the times indicated below, re-
move the wires from the compressor and measure the insulation resistance again.
SW1
A Circuit diagram example
(low noise mode)
B On-site arrangement
C External input adapter
(PAC-SC36NA-E)
Set the refrigerant address using the Dip switch of the outdoor unit.
SW7 Function Setting
Refrigerant
SW7 Setting
address
ON
00
OFF
3 4 5 6 7
ON
01
OFF
3 4 5 6 7
ON
02
OFF
3 4 5 6 7
W50VHA(2)
Sound Level (Measured under rated operating frequency.)
SPL
Heating dB(A)
Cooling dB(A)
PWL
Heating dB(A)
"
CNDM
D Outdoor unit control board
E Max. 10 m
F Red
G Brown
H Orange
Refrigerant
SW7 Setting
address
ON
03
OFF
3 4 5 6 7
ON
04
OFF
3 4 5 6 7
ON
05
OFF
3 4 5 6 7
W85VHA(2)
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48
45
48
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• The insulation resistance drops due to the accumulation of refrigerant in the
compressor. The resistance will rise above 1 M" after the compressor is warmed
up for 4 hours.
(The necessary time to warm up the compressor varies according to atmos-
pheric conditions and refrigerant accumulation.)
• If the refrigerant accumulates within the compressor, the compressor must be
warmed up at least 12 hours before starting the operation to prevent breakdown.
4. If the insulation resistance rises above 1 M", the compressor is not faulty.
- Starting operation immediately after turning on the main power switch can result
in severe damage to internal parts. Keep the power switch turned on during the
operating period.
The low noise mode will be activated when a commercially available timer or the
contact input of an ON/OFF switch is added to the CNDM connector (option) on the
control board of the outdoor unit.
1 Complete the circuit as shown when using the external input adapter
(PAC-SC36NA-E). (Option)
2 SW1 ON: Low noise mode
SW1 OFF: Normal operation
W112VHA
HW112YHA(2)
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53
53
53
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HW140Y/VHA(2)
53
53
67
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