Haier AD242AMNAA Instruction Manual page 24

INSTALLATION MANUAL FOR OUTDOOR UNIT
4. Refrigerant piping
(1) Outline piping
(2) Piping size
Model 36,42 series
Gas piping
19.05(3/4")x1.0mm
Liquid piping 9.52(3/8")x0.8mm
Install the removed flared nuts to the pipes to be connected,
then flare the pipes.
(3) Limitations for one way piping length and vertical height difference.
One way piping length: less than 30m (for 24,28 series).
less than 50m (for 36,42 series).
Vertical height difference: Less than 15m (for 24,28 series).
less than 30m (for 36,42 series).
Precautions for refrigerant piping
Do not twist or crush piping.
Be sure that no dust is mixed in piping.
Bend piping with as wide angle as possible.
Keep insulating both gas and liquid piping.
Check flare-connected area for gas leakage.
(4) Air purge
.
a. For 24,28 series
Purge air out of indoor unit and piping as shown in the Fig.
(1) Remove the valve cap on 2-way valve in outdoor unit.
(2) Loosen by 1-1.5 turn the flare nut of gas pipe, which is connected
to 3-way valve.
(3) Loosen the valve rod of 2-way valve by 90 degrees (use a hexagon
wrench) for about 15 seconds, air will be pushed out from flare nut
on gas pipe.
(4) Open 2-way and 3-way valves using specified torque.
(5) Tighten the caps on the valves with specified torque.
(6) Conduct gas leakage using gas leakage detector or soap water.
Note:
When additional refrigerant piping is necessary, first purge air out of connecting pipe by external gas,
then drive out the excessive refrigerant by purging method.
Brand new unit is charged 80g more refrigerant than spec. This is only for first installation to purgeair in
the indoor unit and connecting pipe.
b. For 36,42 series.
Carry out the air purge of the indoor unit and refrigerant piping by vacuuming.
Procedures:
1) Tighten all the flare nuts of the piping on the side of indoor and outdoor units so that there is no leakage.
2) Carry out vacuuming from the service valve charge port with the service valves (both liquid and gas side)
of the outdoor unit fully closed.
3) After vacuuming, remove the cap nut for the valve stem, and tighten the cap nuts (cap nuts for valve stem
and charge port) with service valve (both liquid and gas) fully opened.
(5) Method of opening and closing service valve of outdoor unit
1) Remove the hexagonal cap nut.
2) Operate the valve using a hexagonal wrench to open by left turn
and to close by right turn.
3) Tighten the hexagonal cap nut after the piping works.
Flare connection
Indoor
unit
24,28 series
15.88(5/8")x1.0mm
9.52(3/8")x0.8mm
23
Check joint
Service valve
Gas pipe
Outdoor
unit
Liquid
pipe
Flare connection
Liquid pipe
9.52mm(3/8")
Gas pipe
15.88mm(5/8")
Flare nut
90
Open
Hexagon wrench
(attachment)