Haier HDU-24H03/H, HDU-42H03/H Refrigerant piping, Installation Manual For Outdoor Unit

INSTALLATION MANUAL FOR OUTDOOR UNIT

4. Refrigerant piping			Flare connection	Check joint
			Gas pipe	Service valve
(1)	Outline piping		Indoor	Outdoor
			unit	unit
(2)	Piping size		Liquid
			pipe	Flare connection
	Model	HDU-42H03/H	HDU-24H03/H
			HDU-28H03/H
	Gas piping	19.05(3/4")x1.0mm	15.88(5/8")x1.0mm	0.5
	Liquid piping	9.52(3/8")x0.8mm	9.52(3/8")x0.8mm
				90 +
	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 (HDU-24H03/H ,HDU-28H03/H). less than 50m (for HDU-42H03/H).

Vertical height difference: Less than 15m (for HDU-24H03/H ,HDU-28H03/H). less than 30m (for HDU-42H03/H).

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.

Gas pipe

Liquid pipe 15.88mm(5/8") 9.52mm(3/8")

Flare nut

90

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.

Open

Hexagon wrench (attachment)

23