Installation Procedure
14
The air tightness test adopts nitrogen tank to give pressure according to the pipe connection mode as the following figure
shown.
The gas and liquid valve are all in close state. In order to prevent the nitrogen entering the circulation system of outdoor
unit, tighten the valve rod before giving pressure (both gas and liquid valve rods).
In 1) to 3) steps, if the pressure drops, check the leakage in each joint by listening, touching and using soap water etc.
to identify the leaking point. After confirming the leaking point, welding it again or tighten the nut tightly again.
Checking the leaking point
1) Pressurize for over 3 minutes at 0.3MPa (3.0 kg/cm
2
g).
2) Pressurize for over 3 minutes at 1.5MPa (15 kg/cm
2
g). A large
leakage will be found.
3) Pressurize for about 24 hours at 3.0MPa (30 kg/cm
2
g). A small
leakage will be found.
Installation Procedure
Air Tightness Test
When pressurizing for 24 hours, a variation of 1 C in the ambient temperature will cause a variation of 0.01MPa(0.1kg/cm
2
g)
in pressure. It shall be corrected during test.
Check if the pressure drops
If the pressure does not drop, then pass.
If the pressure drops, then please check the leaking point.
Cylinder pressure gauge
Cylinder of nitrogern
Line pressure gauge
Tubing bring brazed
Sweat joint
Large slip-on connector
Service hose
Additional Refrigerant Charge
Outdoor
Completely tightened
Completely tightened
Flare part
Outdoor units
Manhole
Discharging valve
stop valve totally closed
(Gas side)
Low pressure piezometer
High pressure piezometer
Meter separator
Dropping valve
stop valve totally closed
(Liquid side)
Nitrogen tank
VL VH
Indoor units
Indoor
Flare part
After finishing connection of refrigerant pipe, it shall perform air tightness test.
1.It is not neccesary to charge additionally when the piping length L+P 20m.
2.Please charge refrigerant additionally according to the following table when the piping length L+P 20m or need to
complete recharge .
Remark:
a.L is the main pipe length of liquid pipe;P is the sum length of branch liquid pipes.
b.The piping length L+P means the sum of the main pipe and branch pipes.
For MAXI system (Twin,Triple,Quadruple),piping length=L+P L.
For single split system,L+P=L,because P=0.
Specification of refrigerant charge for single split and maxi split.
Summary of Contents for YHUJYH(024-060)BAR(S)XA-X(Y)
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