Charging Of Refrigerant - Haier AU55NFIAIA Service Manual

c. Vacuumize 2~3 hours according to the length of the pipe. When vacuuming, confirm the
gas side and liquid side of the 2-way valve and 3-way valve shall be in full close state.
d. When it is not lower than 200Pa after 2 hours or more vacuuming, vacuums for another 1
hour. If after more than 3 hours vacuuming it is still not lower than 200Pa, the leak part
shall be found.
e. When it is lower than 200Pa after more than 2 hours vacuuming, close both the valve VL
and VH of the diverter, then close the vacuum pump. Place it there to observe if the
vacuity changes. If it changes, it indicates leakage exists, so the leak part shall be found.
f. After finishing the above vacuuming work, replace the vacuum pump with refrigerant
tank and turn to the refrigerant charging procedure.

5.10 Charging of refrigerant

1. Calculation of additional charging amount of refrigerant
After finishing vacuuming work, replace the vacuum pump with refrigerant tank and turn to
the refrigerant additional charging procedure.
Calculation of additional charging amount of refrigerant
Before the air conditioner leaving factory, the refrigerant-charging amount does not include
the refrigerant in the site pipe part. Calculate the refrigerant amount for the site pipe first, then
do the additional refrigerant charging work.
Refrigerant charging amount when air conditioner leaves factoryR22: 2x1.6Kg; R407C:2x2.0Kg.
Calculation method:
According to the liquid pipe dimension of site pipe and actual length to calculate the
additional refrigerant-charging amount.
Calculation formula:
Site refrigerant charging amount=Length of liquid pipe x additional refrigerant charging
amount/m
For example: additional charging amount
R (kg) = (L1x0.030kg/m)+(L2x0.065kg/m)
L1: Total length of liquid pipe diameter 6.35mm;
L2: Total length of liquid pipe diameter 9.52mm.
2. Charging of refrigerant
Close all valves of outdoor unit, and charge refrigerant from air discharge valve of
When can not charge the specified amount, firstly, open all the valves, both liquid side and
gas side, of outdoor unit, then switch the valve of gas side to close state a little. Under this
condition, do cooling operation and charge refrigerant from the discharge valve of gas side. At
this time, adjust the valve of the refrigerant tank to make the refrigerant in Gas State when it
is absorbed by system.
When refrigerant leakage making refrigerant lack in system occurs, the intrinsic refrigerant of
the system shall be recovered and recharge it according to specified amount.
3. Opening of the refrigerant pipe
Open all the valves of outdoor unit
Commercial Air Conditioner
- 36 -
Model: AU55NFIAIA
gas side.