Sanyo SAP-CRV123EH User Manual download pdf (Page 50)

12-6. In Case Refrigerant is Leaking

(1) Detecting Leaks

● Use the detector for R410A to locate refrigerant leak

points.

(2) Recovering refrigerant

● Never release the gas to the atmosphere; recover

residual refrigerant using the refrigerant recovery unit

for R410A, instead.

● Do not reuse the recovered refrigerant because its

composition will have been altered.

(3) Welding leaking points

● Confirm again that no residual refrigerant exists in the

unit before starting welding.

● Weld securely using flux and wax for R410A.

● Prevent oxide film from forming inside the tubes utiliz-

ing substitution with nitrogen (N2) in the refrigerant

circuit of the unit. Leave ends of tubes open during

welding.

(4) Checking for sealing

● Use nitrogen gas for the pressurized gas, and never

use a refrigerant other than R410A. Also do not use

oxygen or any flammable gas.

(5) Evacuation

●

Use a solenoid valve-installed vacuum pump

that even if power is cut off in the middle of evacuation

of air due to a power interruption, the valve will prevent

the pump oil from flowing back.

● The equipment may be damaged if moisture remains

in the tubing, thus carry out the evacuation thoroughly.

● When using a vacuum pump with exhaust air volume

more than 25L/min. and ultimate vacuum pressure rate

of 0.05Torr:

Standard time for evacuation

(6) Recharging

● Recharge unit in the same manner explained on the

previous page “(5) Recharging.”

CAUTION

Never attempt to charge additional refrigerant when refrigerant has been leaking

from the unit. Follow the procedure described below to locate points of leaks and

carry out repairs, then recharge the refrigerant.

(2) Recover refrigerant

(3) Weld leaking points

(4) Check for sealing

(5) Evacuation

(6) Recharge

(1) Detect leaks

Length of tubing Less than 10 m More than 10 m

Time More than 10 minutes More than 15 minutes

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 76 77

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Sanyo SAP-CRV123EH User Manual Page 50

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