Johnson Controls 22 SEER Leak Test And Evacuation, Air Purging With Vaccum Pump, UIM-B-0113

898841-UIM-B-0113

Action	Shut-off	Suction/Vapor
	2-way Valve	2-way Service Valve
	CLOSED
Evacuating with a
vacuum pump

FULLY

OPEN

Outdoor unit running

FULLY

OPEN

Checking pressure and adding refrigerant

SUCTION/VAPOR

HOSE WITH 2-WAY SERVICE VALVE SCHRADER VALVE

PUSH

REQUIRES FIELD PROVIDED 5/16” FEMALE

FLARE TO 1/4” MALE FLAREADAPTER.

VALVE CAP	OPEN POSITION
FLARE CAP
	CLOSED POSITION
	SCHRADER CORE
TO LINE SET	SERVICE
	PORT
	SERVICE
	PORT CAP
TO OUTDOOR UNIT
FLARE CAP
	ALLEN WRENCH (5MM)
	OPEN POSITION

TO LINE SET CLOSED POISTION

TO OUTDOOR UNIT

FIGURE 38: Service Valve Operation

LEAK TEST AND EVACUATION

Air and moisture remaining in the refrigerant system will have undesir- able effects as indicated below:

1.Pressure in the system rises.

2.Operating current rises.

3.Cooling or heating efficiency drops.

4.Moisture in the refrigerant circuit may freeze and block capillary tubing (30 kBtu size only).

5.Water may lead to corrosion of parts in the refrigeration system.

The line set between the indoor and outdoor units must be leak tested and evacuated to remove any non-condensable and moisture from the system.

AIR PURGING WITH VACCUM PUMP

COMPOUND

PRESSURE

GAUGE

-101kPa (-76cmHg)

HANDLE LOW

CHARGE HOSE

CONNECTING

PIPE

PACKED VALVE

AT LIQUID SIDE

PRESSURE GAUGE

MANIFOLD VALVE

HANDLE HIGH (KEEP FULL CLOSED)

CHARGE HOSE

VACUUM PUMP

ADAPTER FOR

COUNTER-FLOW

PREVENTION

VACUUM

PUMP

Be sure to use a vacuum pump with counter-flow prevention function to make oil inside the pump does not flow back into the system pipes when the pump stops.

1.Run the vacuum pump.

2.Connect the charge hose from the manifold valve to the service port of the gas side packed valve.

3.Connect the charge hose to the port of the vacuum pump.

4.Open fully the low pressure side handle of the gauge manifold valve.

5.Operate the vacuum pump to begin evacuating.

6.The operation time for evacuation varies with the lineset length and capacity of the pump. Allow the pumpto operate until the system has been evacuated downto 300 microns. Allow the pump to con- tinue running foran additional 15 minutes.

7.Turn off the pump and leave the connection secured to the suction/ vapor 2-way service port. After five minutes, if the system fails to hold 500 microns or less, check all connections for tight fit and repeat the evacuation procedure.

8.Close the low pressure valve handle of gauge manifold.

9.Open fully the valve stem of the packed valves (both gas and liquid sides).

10.Remove the charging hose from the service port.

11.Securely tighten the caps on the packed valves.

PACKED VALVE AT GAS SIDE

SERVICE PORT

SCHRADER CORE

FIGURE 39: Gauge Set Connections for Test Leaks, Evacuation Charging

ADDING REFRIGERANT FOR LONGER LINE SET

1.Open the low side manifold gauge valve and weigh in liquid refriger- ant. Use Table 6 to calculate the correct weigh-in charge.

2.Close manifold gauge valves.

LEAK TEST

Use the following procedure to test for system leaks:

1.Connect the manifold gauge set and dry nitrogen gas cylinder to the suction/vapor service port. See Figure 30.

2.Open valve on nitrogen cylinder.

3.Pressurize the system to no more than 150 PSIG with dry nitrogen.

4.Check for leaks using soapy water.

5.After the system is found to be free of leaks:

•Close valve on nitrogen cylinder

•Relieve the nitrogen pressure by: loosening the charge hose con- nector at the nitrogen cylinder.

•When the system pressure is reduced to normal, disconnect the hose from the cylinder.

Johnson Controls Unitary Products 17