Basic Functions of the Service Valves

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
Action	Valve (2-Way)	Valve (3-Way)
	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
CAUTION
	Close

When opening or clos-		PUSH
ing the service valve		PUSH
ing the service valve	Open
stem, use the hex	Open
stem, use the hex	Hex	NOTE
wrench. Be sure to fully	wrench	NOTE
wrench. Be sure to fully
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.

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