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Piping installation
Installer reference guide
42
3AMXF-A9, 3AMXF-A9, 3AMXM-N9
R32 Split series
4P600463-1F – 2022.05
7.3.3 To check for leaks
NOTICE
Do NOT exceed the unit's maximum working pressure (see "PS High" on the unit
name plate).
NOTICE
ALWAYS use a recommended bubble test solution from your wholesaler.
NEVER use soap water:
▪
Soap water may cause cracking of components, such as flare nuts or stop valve
caps.
▪
Soap water may contain salt, which absorbs moisture that will freeze when the
piping gets cold.
▪
Soap water contains ammonia which may lead to corrosion of flared joints
(between the brass flare nut and the copper flare).
1
Charge the system with nitrogen gas up to a gauge pressure of at least
200 kPa (2 bar). It is recommended to pressurize to 3000 kPa (30 bar) in order
to detect small leaks.
2
Check for leaks by applying the bubble test solution to all connections.
3
Discharge all nitrogen gas.
7.3.4 To perform vacuum drying
DANGER: RISK OF EXPLOSION
Do NOT open the stop valves before the vacuum drying is finished.
Connect the vacuum pump and manifold as follows:
a
h
b
f
h
i
e
c
d
e
g
j
a
Pressure meter
b
Gauge manifold
c
Low-pressure valeve (Lo)
d
High-pressure valve (Hi)
e
Charging hoses
f
Vacuum pump
g
Service port
h
Valve lids
i
Gas stop valve
j
Liquid stop valve
1
Vacuum the system until the pressure on the manifold indicates −0.1 MPa
(−1 bar).
2
Leave as is for 4-5 minutes and check the pressure:
If the pressure…
Then…
Does not change
There is no moisture in the system.
This procedure is finished.
