Carrier 60 Service Manual download pdf (Page 37)

T -295

4-4

1. Suction Service

Valve and Port

2. Discharge Line

Service Port

3 Check Valve

4. Manifold Gauge

Set

5. Vacuum Pump

6. Reclaimer

7. Refrigerant Cylinder

8. Thermistor Vacuum

Gauge

Figure 4-6. System Charge Removal Connections

4.5.4. Removing Entire System Charge

To remove the entire refrigerant charge, do t he

following:

a. Connect a manifold gauge set t o t he system as shown

in Fi gure 4-6.

b. Connect a reclaimer to the center manifold gauge set

connection.

c. Recover refrigerant in accordance with reclaimer

manufacturers instructions.

4.6 REFRIGERANT LEAK CHECK

A refrigerant leak check should always be performed

after the system has been opened to replace or repair a

component.

To check for leaks in the refrigeration system, perform

the following procedure:

NOTE

It must be emphasized that only the correct re-

frigerant should be used to pressurize the sys-

tem. Use of any other refrigerant will contami-

nate the system, and require additional

evacuation.

a. Ensure the liquid line service and solenoid valves are

open.

b. If system is without refrigerant, charge system with

refrigerant vapor to build up pressure between 20 to

30psig(1.36to2.04bar).

c. Add sufficient nitrogen to raise system pressure to

150 to 200 psig (10.21 to 13.61 bar).

d. Check for leaks. The recommended procedure for

finding leaks in a system is with an electronic leak de-

tector. Testing joints with soapsuds is satisfactory

only for locating large leaks.

e. Remove test gas and replace filter--drier.

f. Evacuate and dehydrate the system. (Refer to para-

graph 4.7.)

g. Charge the unit. (Refer to paragraph 4.8. )

h. Ensure that a Logic Board self-test has been per-

formed and that there are no errors or alarms indi-

cated. (Refer to paragraph 2.1.3.)

4.7 EVACUATION AND DEHYDRATION

4.7.1 General

The presence of moisture in a refrigeration system can

have many undesirable effects. The most common are

copper plating, acid sludge formation, “freezing-up” of

meteri ng devices by free water, and formation of acids,

resulting in metal corrosion.

4.7.2 Preparation

NOTE

Using a compound gauge for determination of

vacuum level is not recommended because of

its inherent inaccuracy.

a. Evacuate and dehydrate only after pressure leak test.

(Refer to paragraph 4.6)

b. Essential tools to properly evacuate and dehydrate

anysystem i ncludea good vacuum pumpwith amini-

mum of 5 cfm (8.5 m

/hr) volume displacement,

(CTD P/N 07-00176-01), and a good vacuum indica-

tor (available t hrough Robinair Manufacturing,

Montpelier, Ohio, Part Number 14010).

c. Keep the ambient temperature above 60F (15.6C)

to speed evaporation of moisture. If ambienttempera-

ture is lower than 60F (15.6C), ice may formbefore

moisture removal is complete.

4.7.3 Procedure for Evacuation and Dehydrating

System

a. Remove refrigerant using a refrigerant recovery sys-

tem. Refer t o paragraph 4.5.4

b. The recommended method is connecting lines (3/8”

OD copper tubing or refrigerant hoses designed for

vacuum service) as shown in Figure 4-6.

c. Make sure vacuum pump valve is open.

d. Start vacuum pump. Slowly open valves halfway and

then open vacuum gauge valve.

e. Evacuate unit until vacuum gaugeindicates 1500 mi-

crons Hg vacuum. Close gauge valve, vacuum pump

valve, and stop vacuum pump.

f. Break the vacuum with clean dry refrigerant. Use re-

frigerant that the unit calls for. Raise system pressure

to approximately 2 psig (0.14 bar).

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Carrier 60 Service Manual Page 37

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