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17 Finishing the outdoor unit installation
ON
OFF
1
2
3
4
DS1
DIP switch 1
16.6
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
≥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.
17
Finishing the outdoor unit
installation
17.1
To insulate the refrigerant piping
After finishing the charging procedure, the piping must be insulated.
Take into account the following points:
▪ Make sure to insulate the connection piping and refrigerant branch
kits entirely.
▪ Be sure to insulate the liquid and gas piping (for all units).
▪ Use heat resistant polyethylene foam which can withstand a
temperature of 70°C for liquid piping and polyethylene foam which
can withstand a temperature of 120°C for gas piping.
▪ Reinforce the insulation on the refrigerant piping according to the
installation environment.
Ambient
Humidity
temperature
≤30°C
75% to 80% RH
>30°C
≥80% RH
Between outdoor and indoor unit
1 Insulate and fix the refrigerant piping and cables as follows:
e
b
a
d
c
a
Liquid pipe
b
Gas pipe
c
Finishing tape
d
Interconnection cable (F1/F2)
e
Insulation
2 Install the service cover.
Installation and operation manual
34
Then
Minimum thickness
15 mm
20 mm
Inside the outdoor unit
To insulate the refrigerant piping, proceed as follows:
a
b
d
c
1 Insulate the liquid and gas piping.
2 Wind heat insulation around the curves, and then cover it with
vinyl tape (c, see above).
3 Make sure the field piping does not touch any compressor
components.
4 Seal the insulation ends (sealant etc.) (b, see above).
5 Wrap the field piping with vinyl tape (d, see above) to protect it
against sharp edges
6 If the outdoor unit is installed above the indoor unit, cover the
stop valves with sealing material to prevent condensed water
on the stop valves from moving to the indoor unit.
NOTICE
Any exposed piping might cause condensation.
7 Reattach the service cover and the piping intake plate.
8 Seal all gaps to prevent snow and small animals from entering
the system.
a
a
Seal
NOTICE
Do not block the air vents. This could affect air circulation
inside the unit.
WARNING
Provide adequate measures to prevent that the unit can be
used as a shelter by small animals. Small animals that
make contact with electrical parts can cause malfunctions,
smoke or fire.
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600329-1E – 2023.02
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