Sanyo SAP-CMRV1426EH-F English, Fig, Before using the vacuum pump, adapter, read the vacuum pump

English

4. Air Purging
Air and moisture remaining in the refrigerant system
have undesirable effects as indicated below.
Therefore, they must be purged completely.	Service
● pressure in the system rises	valve on
● operating current rises	narrow
	tube side
● cooling efficiency drops	Service
	valve on
● moisture in the air may freeze and block capillary	wide tube
tubing	side
● water may lead to corrosion of parts in the
refrigerant system
■ Air Purging with a Vacuum Pump
(for Test Run)	With push-pin

●In order to protect the earth’s environment, be sure to use a vacuum pump to perform the air purge.

(Never perform an air purge by using the refrigerant gas cylinder or other external gas, or by using the gas inside the outdoor unit.)

Perform the air purge for tubes A, B, C and D. Use the same procedures for all tubes.

D	Manifold gauge
C	(special for R410A)
	Low-pressure	High-pressure valve
B
	valve		Vacuum pump
A			adapter
	Leave the Lo	Hi	(for preventing
	valve open.		reverse flow)
			(special for
	Open
			R410A)
Hex wrench			Vacuum
(nominal size 4mm,	Charging hose		pump
not provided)
	(special for R410A)

Fig. 20

CAUTION

In order to prevent charging errors with the air conditioner that uses R410A, the screw diameter at the service valve charging port has been changed. When recharging or performing other servicing, use the special charging hose and manifold gauge.

(1)Check that each tube (both narrow and wide tubes) between the indoor and outdoor units have been properly connected and all wiring for the test run has been completed. Note that both narrow and wide tube service valves on the outdoor unit are kept closed at this stage.

(2)Using an adjustable wrench or box wrench, remove the valve caps from the service valve on both narrow and wide tubes.

(3)Connect a vacuum pump and a manifold valve (with pressure gauges) to the service port on the wide tube service valve. (Fig. 20).

Stopper

Spindle

Screw diameter: 1/2

UNF 20 threads

Valve core

Cap nut tightening torque: 7 – 11 N·m (70 – 110 kgf·cm)

(Tighten by hand, then use a wrench to turn approximately 30 .)

Cap tightening torque: 20 – 25 N·m

(200 – 250 kgf·cm) (Tighten by hand, then use a wrench to turn.)

	Before using the vacuum pump	<Structure of service valve on wide tube side>
CAUTION
	adapter, read the vacuum pump	Fig. 21
	adapter manual, and use the
	adapter correctly.
	Be sure to use a manifold valve
CAUTION		● When using a hex wrench to open the spindle, an
	for air purging. If it is not
		extremely small amount of refrigerant may leak.
	available, use a stop valve for
		This does not indicate a problem.
	this purpose.The “Hi” knob of
	the manifold valve must always	● Use a hex wrench of a type to which force can be
	be kept closed.	easily applied.

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