Sanyo PNR-XS2432 Basic Function of the Service Valves, Action, Valve 2-Way Valve 3-Way, Pump Down

9-3. Basic Function of the Service Valves

The basic function of the service valves are given in Table 7 below.

Action	Narrow Tube Service	Wide Tube Service
	Valve (2-Way)	Valve (3-Way)
		O-ring	Valve cap
			Stem
Shipping
	1826_M_I		1827_M_I
Operating and
test running the
air conditioner
	1828_M_I		1829_M_I
Measuring		∗
pressure
and gas charging
	1830_M_I		1831_M_I
Air purging with a		∗
vacuum pump

1832_M_I

1833_M_I

∗ The service port on the wide tube service	Service valve
valve uses a Schrader core valve to access	Hose with push-pin
the refrigerant system. Therefore, be sure to
use a hose connector which has a push-pin
inside. (Fig. 9-3)
	PUSH

1834_M_I

Fig. 9-3

9-4. 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 operation.

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

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

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