Air purging, When using the Vacuum Pump

Low pressure valve

Valve body Valve stem

Heat Controller, Inc.	VMH 30/36 SERIES	Installation, Operation & Maintenance

OUTDOOR SECTION

5AIR PURGING

1.Air purging

Air and moisture in the refrigerant system have undesirable effects. Therefore, the indoor unit and tubing between the indoor and outdoor unit must be leak tested and evacuated to remove any noncondensables and moisture from the system.

Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units have been properly connected and all wiring for the test run has been completed.

Pipe length and refrigerant amount:

Units are pre-charged for 16.5 ft. (5m) total line set length, additional charge is needed for longer line sets lengths. Charge adjustments are not required for line sets less than 16.5 ft (5m)

Capacity	Pipe Size		Standard	Max	Total Line Length (ft)		Additional
Btu/h	Gas (in)	Liquid (in)	Length (ft)	Elevation (ft)	Min.	Max.	Refrigerant oz/ft
30-36k	5/8 (16mm)	3/8(9.52mm)	*16.5 (5m)	32 (9.75m)	10 (3m)	82 (25m)	.4 (40g/m)

*Unit charge located on rating plate includes enough refrigerant for 16.5 feet of line set.

*Charge adjustment is not required on line set lengths less than 16.5 feet. Ensure any R-410A refrigerant is added to the unit in liquid form.

CAUTION

Open the valve stem until it hits against the stop. Do not try to open it further. Securely tighten the valve stem cap with a spanner or wrench.

See tightening torque table on page 8 to properly tighten and torque the valve stem cap.

Outdoor	Refrigerant		Indoor

unit	A Gas side		unit
			C
	Liquid side		D
	B	Half union
Packed valve

Flare nut

Stop

Cap

2. When using the Vacuum Pump

NOTE: Refer to the manifold valve manufacturer’s instructions before use.
1.	Completely tighten the flare nuts, A, B, C, D, (see figure	Manifold valve
	on page 10) connect the manifold valve charge hose to a	Manifold valve
	on page 10) connect the manifold valve charge hose to a	Compound meter	Pressure gauge
	charge port of the low pressure valve on the gas side.	Compound meter	Pressure gauge
	charge port of the low pressure valve on the gas side.	-29.92 inHg
2.	Connect the charge hose connection to the vacuum	-29.92 inHg
	pump.	*(-76cmHg)
3.	Fully open the Lo handle of the manifold valve.	Lo Handle	Hi Handle
4.	Operate the vacuum pump to evacuate. After starting	Lo Handle	Hi Handle
4.	Operate the vacuum pump to evacuate. After starting	Charge hose
	evacuation, slightly loose the flare nut of the low pressure	Charge hose	Charge hose
	valve on the gas side and check that the air is		Vacuum pump
	entering. (Operation noise of the vacuum pump changes

and a compound meter indicates 0 instead of minus)

5.After the evacuation is complete, fully close the lo handle of the manifold valve and stop the operation of the

vacuum pump.

Evacuate for 15 minutes and more and check

that the compound meter indicates -29.92inHg(-76cmHg).

6.Turn the stem of the low pressure valve B about 45O counter- clockwise for 6~7 seconds after the gas units out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a little higher than the atmosphere pressure.

7.Remove the charge hose from the Low pressure charge hose.

8.Fully open the packed valve stems B and A.

9.Securely tighten the cap of the packed valve.

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