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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.

 

 

 

16

Page 121 Page 123
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Image 122
Sanyo SAP-CMRV1426EH-F Moisture in the air may freeze and block capillary, Tubing, Before using the vacuum pump
Page 121 Page 123

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