Haier HDU-24H03/H Instruction Manual page 24

INSTALLATION MANUAL FOR OUTDOOR UNIT
4. Refrigerant piping
(1) Outline piping
(2) Piping size
HDU-42H03/H
Model
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 (
less than 50m (for
Vertical height difference: Less than 15m (for
less than 30m (for
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
HDU-24H03/H , HDU-28H03/H
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
HDU-42H03/H
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
HDU-24H03/H
HDU-28H03/H
15.88(5/8")x1.0mm
9.52(3/8")x0.8mm
HDU-24H03/H , HDU-28H03/H
).
HDU-42H03/H
).
HDU-42H03/H
.
.
Check joint
Gas pipe
Indoor
unit
Liquid
pipe
Flare connection
).
HDU-24H03/H , HDU-28H03/H
23
Service valve
Outdoor
unit
).
Gas pipe
Liquid pipe 15.88mm(5/8")
9.52mm(3/8")
90
Open
Hexagon wrench
(attachment)
Flare nut