Basic Functions of the Service Valves

The basic functions of the service valves are given in Table 8 below.

Table 8

Action

Narrow Tube Service

Wide Tube Service

Valve (2-Way)

Valve (3-Way)

 

 

CLOSED

O-ring

Valve cap

 

 

 

Stem

Shipping

Fully OPEN

Operating and test running

the air conditioner

 

Fully OPEN

 

Measuring pressure

*

 

and gas charging

 

 

 

CLOSED

 

 

*

The service port on the wide tube ser-

Air purging with

*

vice valve uses a Schrader core valve

a vacuum pump

 

to access the refrigerant system.

 

 

Therefore, be sure to use a hose con-

 

 

nector which has a push-pin inside.

 

 

(Fig. 60a)

Service valve

CAUTION

Hose with push-pin

 

 

Close

When opening or clos-

 

PUSH

ing the service valve

 

Open

 

stem, use the hex

 

Hex

NOTE

wrench. Be sure to fully

wrench

 

 

seat the wrench before

Fig. 60b

External diameter of service port

turning the valve.

 

R410A: 5/16"

 

 

Fig. 60a

Pump Down

Pump down means collecting all refrigerant gas in the system back into the outdoor unit without losing any of the gas. Pump down is used when the unit is to be moved or before servicing the refrigerant circuit.

Pump Down Procedure

Be sure to carry out pump down with the unit in cooling mode.

(1)Connect the Lo side charging hose of the manifold valve to the service port on the wide tube service valve.

(2)Using a hex wrench, turn the narrow tube service valve clockwise all the way to close the service valve. (Be sure to confirm that the wide tube service valve is fully open.)

(3)Press the operation button and start cooling oper- ation.

(4)When the low pressure gauge reading falls to 14.2 to 7.1 psi (1 to 0.5 kg/cm2), fully close the wide tube valve stem. Then quickly stop the unit.

(5)Disconnect all gauges and hoses, and replace the valve caps as they were before.

29

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Panasonic CU-KE30NKU, CU-KE36NKU, CS-KE36NKU, CS-KE30NKU service manual Basic Functions of the Service Valves, Pump Down
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