Haier AB092FCBIA Сервис мануал онлайн [34/126] 619441

Commercial Air Conditioner Model: AU242FHBIA,

AU482FIBIA, AU48NFIBJA

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 factory

R407C:4200g.

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 gas side.

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.

5.10 Charging of refrigerant

tank and turn to the refrigerant charging procedure.

f. After finishing the above vacuuming work, replace the vacuum pump with refrigerant

vacuity changes. If it changes, it indicates leakage exists, so the leak part shall be found.

and VH of the diverter, then close the vacuum pump. Place it there to observe if the

e. When it is lower than 200Pa after more than 2 hours vacuuming, close both the valve VL

shall be found.

hour. If after more than 3 hours vacuuming it is still not lower than 200Pa, the leak part

d. When it is not lower than 200Pa after 2 hours or more vacuuming, vacuums for another 1

gas side and liquid side of the 2-way valve and 3-way valve shall be in full close state.

c. Vacuumize 2~3 hours according to the length of the pipe. When vacuuming, confirm the

3. Opening of the refrigerant pipe

Open all the valves of outdoor unit

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