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CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
10.1. Evacuation of Installation
When installing an air conditioner, be sure to evacuate the air inside the indoor unit and pipes in the following procedure.
Required tools:
Hexagonal wrench, adjustable wrench, torque wrench,
wrench to hold the joints, gas leak detector, charging set
and vacuum pump.
(Indoor unit)
Vacuum Pump
Service port cap
Be sure, using a torque wrench to tighten the service port cap(after using the service port),so that it prevents the gas leakage
from the refrigeration cycle.
Procedure:
1 Connect a charging hose with a push pin to the Low
.
side of a charging set and the service port of the 3-way
valve.
Be sure to connect the end of the charging hose with the
push pin to the service port.
2.Connect the centre hose of the charging set to a
vacuum pump.
3.Turn on the power switch of the vacuum pump and
make sure that the needle in the gauge moves from 0
cmHg (0 Mpa) to -76 cmHg (-0.1 Mpa). Then evacuate
the air for approximately 10 minutes.
4.Close the valve of the Low side of the charging set
and turn off the vacuum pump. Make sure that the
needle in the gauge does not move after approximately
5 minutes.
BE SURE TO TAKE THIS PROCEDURE IN ORDER TO
AVOID GAS REFRIGERANT LEAKAGE.
5.Disconnect the charging hose from the vacuum pump
and from the service port of the 3-way valve.
(Liquid side)
(Gas side)
Open
Low
High
The air in the indoor unit and in the piping must be purged.
If air remains in the refrigeration piping, it will affect the
compressor , reduce cooling capacity, and could lead to a
malfunction.
2-way
valve
3-way
valve
Closed
6.Tighten the service port caps of both the 3-way valve
and the 2-way valve at a torque of18 N.m with a torque
wrench.
7.Remove the valve caps of both the 3-way and the 2-way
valves.
Position both of the valves to
wrench (4 mm).
8.Mount valve caps onto both of the 3-way valve and the
2-way valve.
Be sure to check for gas leakage.
If gauge needle does not move from 0 cmHg(0 Mpa) to -76cmHg
(-0.1MPa) in step (3) above, take the following measures:
If the leaks stop when the piping connections are tightened
further, continue working from step (3).
If the leaks do not stop when the connections are retightened,
repair the location of the leak.
50
(Outdoor unit)
Open
Open
"open"
using a hexagonal
Caution
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