Carrier 60 Service Manual download pdf (Page 36)

T -295

4-3

1. Filter-Drier I nlet

Service Valve

2. Thermostatic

Expansion Valve

3. Manifold Gauge

Set

4. Thermistor Vacuum

Gauge

5. Vacuum Pump

6. Refrigerant Cylinder

7. Reclaimer

8. Filter-Drier

9. Liquid Solenoid

Valve

10. Filter-Drier Outlet

Service Valve

Figure 4-4. Low Side Pump Down Connections

i. Re--connect suction pressure transducer and remove

low pressure switch jumper. If required, clear any

alarms that have been generated during this proce-

dure.

j. Open service valves and check refrigerant level. Re-

fer to paragraph 4.8.1.

4.5.2 Refrigerant Removal From An Inoperative

Compressor .

To remove the refrigerant from a compressor that is not

operational, do the following:

a. Attach a manifold gauge set as shown in Figure 4-5

andisolatethecompressorbyfrontseating thesuction

and discharge valves.

b. Recoverrefrigerantwith a refrigerantreclaimer. Ifthe

discharge service valve port is not accessible, it will

be necessary to recover refrigerant through the suc-

tion service valve port only.

c. Service or replace components as required and leak

check the compressor.

d. Using refrigerant hoses designed for vacuum service,

connect a vacuum pump to center connection of man-

ifold gauge set. Evacuate system to 500 microns.

Close offpump valve, isolatevacuum gauge andstop

pump. Wait 5 minutes to verify that vacuum holds.

e. Once vacuum is maintained, recharge low side to 20

to 30 psig (1.36 to 2.04 bar) by admitting vapor from

the refrigerant cylinder. Disconnect manifold gauge

set and backseat compressor service valves.

f. Check refrigerant level. Refer to paragraph 4.8.1. It

may be necessary to clear any alarms that have been

generated.

1. Discharge Service

Valve and Port

2. Suction Service

Valve and Port

3. Manifold Gauge

Set

4. Vacuum Pump

5. Reclaimer

6. Refrigerant Cylinder

7. Thermistor Vacuum

Gauge

Figure 4-5. Compressor Service Connections

4.5.3 Pump Down An Operable Compressor For

Repair

To servicean operablecompressor, pump therefrigerant

into the condenser coil and receiver as follows:

a. Install manifold gauge set. Refer to Figure 4-5.

b. Frontseat the compressor suction service valve by

turning clockwise.

c. Place a jumper on the low pressure switch. Start the

unit and run in cooling until 10 ”/hg (25.4 cm/hg) of

vacuum is reached. Shut the system down.

d. Frontseat the compressor discharge service valve and

wait 5 minutes to verify vacuum is maintained. If the

pressure rises above vacuum, open the compressor

dischargeservicevalveandrepeatsteps candd until a

vacuum is maintained.

e. Service or replace components as required and leak

check the compressor.

f. Using refrigerant hoses designed for vacuum service,

connect a vacuum pump to center connection of man-

ifold gauge set. Evacuate system to 500 microns.

Close offpump valve, isolatevacuum gauge andstop

pump. Wait 5 minutes to verify that vacuum holds.

g. Oncevacuum is maintained, re--connect low pressure

switch, disconnect manifoldgauge setand open com-

pressor service valves.

h. Check refrigerant level. Refer to paragraph 4.8.1. It

may be necessary to clear any alarms that have been

generated.

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Carrier 60 Service Manual Page 36

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