Haier AB18CS1ERA - Page 326

324
Super Match
After nishing connection of refrigerant pipe, it shall perform air tightness test.
■ The air tightness test adopts nitrogen tank to give pressure according to the pipe connection mode as the
following gure 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).
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.
■ Check if the pressure drops
If the pressure does not drop, then pass.
If the pressure drops, then please check the leaking
point.
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.
■ Checking the leaking point
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 conrming the leaking point, welding it again or tighten the nut tightly again.
Specication of refrigerant charge for single split and maxi split.
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.