Carrier 60 Service Manual download pdf (Page 39)

T -295

4-6

1. Cylinder Valve and Gauge

2. Pressure Regulator

3. Nitrogen Cylinder

4. Pressure Gauge (0 to 400 psig = 0 to 27.22 bar)

5. Bleed-Off Valve

6. 1/4 inch Connection

Figure 4-7. Checking High Pressure Switch

c. Connect an ohmmeter across switch terminals.

d. Set nitrogen pressure regulator higher t han switch

cutout setting. (refer to paragraph 1.3.)

e. Close cylinder valve and open bleed--off valve. Open

cylinder valve and slowly close bleed--off valve. The

switch should open, (no continuity) with in required

cut out tolerance.

f. Close cylinder valveand release pressure through the

bleed-off valve. As pressure drops, switch should

close, (continuity) within required cut in tolerance.

g. Replace or re --install switch (as required) and recon-

nect wiring.

4.11 FILTER-DRIER

1234 5 623

1. Filter-Drier Inlet

Service Valve

2. Valve Service Port

3. Flare Nut

4. Filter-Drier

5 Liquid Line

Solenoid Valve

6. Filter-Drier Outlet

Service Valve

Figure 4-8. Filter--Drier Removal

4.1 1.1 To Check Filter--Drier

The filter--drier (see Figure 4-8) must be changed if the

receiver mounted moisture indicator shows high

moisture content or the drier is partially restricted.

Check for a restriction by feeling t he inlet and outlet

linesof the filter--drier. Ifthe outletsidefeel s coolerthan

the inlet side, then the filter--drier should be changed

4.1 1.2 To Replace Filter--Drier

a. Perform a low side pump down. Refer to paragraph

4.5.1.

b. Turn the driver ’s A/C switch to “OFF” position.

c. Frontseat the filter--drier outlet service valve and

place a new filter-drier near the unit for immediate

installation.

WARNING

THE FILTER-DRIER MAY CONTAIN

LIQUID REFRIGERANT. SLOWLY

LOOSENTHE FLARE NUTS ANDAVOID

CONTACT WITH EXPOSED SKIN OR

EYES.

d. Using two open end wrenches, slowly crack open the

flare nuts on each side of the filter-drier. Remove the

filte r - dr ier.

e. Remove seal caps from the new filter-drier. Apply a

light coat of compressor oil to the flares.

f. Assemble the new filter-drier to lines ensuri ng that

the arrow on the body of the filter-drier points in t he

direction of the refrigerant flow (refrigerant flows

from the receiver to the evaporator). Finger tighten

flare nuts.

g. Tighten filter-drier flare nuts using two open end

wrenches.

h. Evacuate the filter--drier and lines by connecting a

vacuum pump as shown in Figure 4-4. Evacuate to

500 microns.

i. Backseat (fully close) both service valve ports and re-

place valve caps.

j. Test filter-drier for leaks.

k. Check refrigerant level.

4.12 CONDENSER COIL REPLACEMENT

a. Placethe driver’s A/C switch in theOFF positionand

tag to prevent unintentional starting.

b. Remove the refrigerant charge. Refer to paragraph

4.5.4.

c. Remove the connection access covers to gain access

to the mounting screws. Remove the m ounting

screws in the connection compartment and at the rear

of the unit next to the receiver supports.

d. Removethefilter--drier mounting screws andremove

the filter--drier. Disconnect the discharge hose.

e. Begin to lift the coil assembly at the left rear. Lift to

clear the service valve then push to the right to clear

the precharge valve. C ontinue to lift towards thefront

to clear the sight glasses and remove from t he unit.

f. To install the coil assembly, reverse the removal pro-

cedure.

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Carrier 60 Service Manual Page 39

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