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Installation Procedure
Step 11 Performing gas leakage test
Use nitrogen gas at a pressure range between 0.2 and 4.1
MPa when testing the gas leakage. If you apply pressure
at over 4.1 MPa, the refrigerant pipes may be damaged.
Outdoor unit
1 Connect the charging hose of low pressure side of
manifold gauge to the packed valve having a service
port as shown at the figure.
NOTE
∙ The designs and shape are subject to change
according to the model.
2 Open the valve of the low pressure side (A) of the
manifold gauge anticlockwise.
3 Connect the manifold gauge to the nitrogen gas.
4 Apply nitrogen gas.
5 Check the change of pressure with a pressure
regulator.
6 Check the gas leakage at the connection part or
brazed part by using soap water.
7 Open the manifold gauge to discharge nitrogen.
42
English
Manifold gauge
High pressure side
Low pressure side
1
Nitrogen gas
Gas
Liquid
Vacuum
2
pump
Step 12 Evacuating the air
1 Connect the manifold gauge to a vacuum pump.
2 Purge the air from the system using the vacuum
pump for about 30 minutes.
∙ Make sure that pressure gauge shows -0.1006 Mpa
after about 30 minutes.
∙ Use a vacuum pump that is at least 140 l/min in
capacity.
∙ Make sure that vacuuming timing is longer when
the piping gets longer.
∙ Pressure will not drop even after 5 minutes of
vacuuming when there is moisture within the pipe.
In this case, apply nitrogen gas again, and then
purge the air again.
Step 13 Charging the refrigerant
1 Measure the quantity of refrigerant depending on the
length of the liquid side pipe.
NOTE
∙ When the pipe length exceeds the standard pipe
length of 5 m, charge refrigerant according to the
increased length. Do not charge refrigerant by
assuming the quantity through the pressure gauge.
When the pipe length is shorter than the standard,
you do not need to charge refrigerant.
Model name
AF36MV1MAEEXTC
AF48MV1MAEEXTC
Refrigerant amount
Standard
Additional
(less 5m)
(over 5m)
g
g/m
1500
20
2900
30
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