To Check For Leaks; To Perform Vacuum Drying - Daikin RXQ35AMV1B Installer's Reference Manual

7 | Piping installation

7.3.3 To check for leaks

7.3.4 To perform vacuum drying

Installer reference guide
40
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.
DANGER: RISK OF EXPLOSION
Do NOT start the unit if it is vacuumed.
Connect the vacuum pump and manifold as follows:
a c
b
d e
f
f
g
a Low pressure gauge
b Gauge manifold
c High pressure gauge
d Low-pressure valve (Lo)
e High-pressure valve (Hi)
f Charging hoses
g Vacuum pump
h Valve caps
i Service port
j Gas stop valve
k Liquid stop valve
1 Vacuum the system until the pressure on the manifold indicates −0.1 MPa
(−1 bar).
h
k
i j
h
RXQ-A_ARXQ-A
R32 split series
4P513661-11P – 2021.11