4. Air Purging

Air and moisture remaining in the refrigerant system have undesirable effects as indicated below. Therefore, they must be purged completely.

pressure in the system rises

operating current rises

cooling efficiency drops

moisture in the air may freeze and block capillary tubing

water may lead to corrosion of parts in the refrigerant system

Air Purging with a Vacuum Pump (for Test Run)

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 and B. Use the same procedures for all tubes.

Service valve on narrow tube side

Service valve on wide tube side

With push-pin

English

 

Manifold gauge

 

(special for R410A)

B

Low-pressure

High-pressure valve

valve

 

Vacuum pump

A

 

 

adapter

Leave the Lo

Hi

(for preventing

 

valve open.

 

reverse flow)

 

 

(special for

 

Open

 

 

 

R410A)

 

 

 

Hex wrench

 

 

Vacuum

 

 

pump

(nominal size 4mm,

Charging hose

 

 

 

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.)

CAUTION

Before using the vacuum pump adapter, read the vacuum pump adapter manual, and use the adapter correctly.

<Structure of service valve on wide tube side>

Fig. 21

CAUTION

Be sure to use a manifold valve for air purging. If it is not available, use a stop valve for this purpose. The “Hi” knob of the manifold valve must always be kept closed.

When using a hex wrench to open the spindle, an extremely small amount of refrigerant may leak. This does not indicate a problem.

Use a hex wrench of a type to which force can be easily applied.

11

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Sanyo SAP-CMRV1426EH-F, SAP-CMRV1926EH service manual Air Purging with a Vacuum Pump for Test Run

SAP-CMRV1926EH, SAP-CMRV1426EH-F specifications

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