Air Tightness Test; Additional Refrigerant Charge - Haier 1U24GS4ERA Manuel D'installation

Installation Procedure
After finishing 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 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).
Indoor
Completely tightened
Completely tightened
Indoor units
1) Pressurize for over 3 minutes at 0.3MPa (3.0 kg/cm
2) Pressurize for over 3 minutes at 1.5MPa (15 kg/cm
leakage will be found.
3) Pressurize for about 24 hours at 3.0MPa (30 kg/cm
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
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 confirming the leaking point, welding it again or tighten the nut tightly again.
Installation Procedure
Specification 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.
Low pressure piezometer
stop valve totally closed
(Gas side)
Outdoor
Flare part
Discharging valve
Flare part
stop valve totally closed
(Liquid side)
2
g).
2
g). A large
2
g). A small
High pressure piezometer
VL VH
Meter separator
Dropping valve
Manhole
Outdoor units
Line pressure gauge
Tubing bring brazed
Sweat joint
Large slip-on connector
Service hose
14

Air Tightness Test

Nitrogen tank
Cylinder pressure gauge

Additional Refrigerant Charge

Cylinder of nitrogern
2
g)