18
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Electrical installation
Installer and user reference guide
120
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
e
Power supply terminal block
f
Connect each power wire: RED to L1, WHT to L2, BLK to L3 and BLU to N
g
Earth wire (GRN/YLW)
h
Tie wrap
i
Cup washer
j
When connecting the earth wire, it is recommended to perform curling.
Multiple outdoor units
To connect the power supply for multiple outdoor units to each other, ring tongues
have to be used. No bare cable can be used.
In that case, the ring washer that is installed by default should be removed.
Attach both cables to the power supply terminal as indicated below:
L1 L2 L2 N
18.7 To check the insulation resistance of the compressor
NOTICE
If, after installation, refrigerant accumulates in the compressor, the insulation
resistance over the poles can drop, but if it is at least 1 MΩ, then the unit will not
break down.
▪
Use a 500 V mega-tester when measuring insulation.
▪
Do NOT use a mega-tester for low voltage circuits.
1
Measure the insulation resistance over the poles.
If
Then
≥1 MΩ
Insulation resistance is OK. This procedure is
finished.
<1 MΩ
Insulation resistance is not OK. Go to the next step.
2
Turn ON the power and leave it on for 6 hours.
Result:
The compressor will heat up and evaporate any refrigerant in the
compressor.
3
Measure the insulation resistance again.
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