Haier HSU-12HM03 Operation Manual page 37

5.Purgeing Method
Push the air out indoor unit and
piping as following:
(1) Remove the valve cap on 2-way valve in outdoor unit.
(2) Loosen by 1/2 turn the flare nut of gas pipe,which is
connected to 3-way valve.
(3) Loosen 2-way valve by 90° using hexagon wrench,
and after approx.10 sec tighten it up. Gas comes out
through flare nut on wide pipe.if no gas is discharged,
tighten flare nut with specified torque.
(4) Open 2-way and 3-way valves using specified torue.
(5) Check the leakage with soap water or detector.
(6) Tighten the caps on the valves with specified torque.
Value rod
Value cap
When connecting pipe exceed 5 meters,16g refrigerant shall be added per exceeding meter.
Charge according excess refrigerant by air purging.
Piping length
Additional amount
Note:
When extending piping,air inside piping shall be removed by using external refrigerant gas,
then discharge excess refrigerant by air purging.
Brand new outdoor unit is charged 50g more refrigerant than regulated weight.
Only for first installattion, this extra 50g can be used to purge air in the pipes.
During this procedure,50g refrigerant will be discharge in piping.
1
(this must be strictly controlled within 90° and 6sec.)
Outdoor Unit
Tightening torque N.m
7-9
20-25
No need
5m 7m
32g
10m
80g