Carrier 50HQ User Manual download pdf (Page 12)

4. Disconnect compressor wiring at compressor

terminal box.

5. Using a tubing cutter, cut suction and dis

charge lines at convenient place near com

pressor for easy reassembly to new compressor

with copper slip couplings.

CAUTION: Excessive movement of copper

lines at compressor may cause a break

where lines connect to coil.

6. Remove compressor holddown bolts and lift

compressor out.

7. Carefully unbraze suction and discharge line

piping stubs from compressor. If oil vapor in

piping stubs ignites, use quenching cloth.

8. Braze piping stubs (removed in step 7) on new

compressor.

9. Clean system.

10. Install new compressor in unit. Braze suction

and discharge lines to compressor piping stubs

(at points where cut, step 5) using field-

supplied copper couplings. Ensure compressor

holddown bolts are in place. Connect wiring.

11. Evacuate and recharge unit.

CAUTION; Before performing recommended

maintenance, be sure main power switch to unit

is turned off.

Lubrication

COMPRESSOR contains factory oil charge. Re

place oil when lost. See Table 6 for oil recharge. If

necessary, refer to Carrier Standard Service Tech

niques Manual, Chapter 1, pages 1-21, for oil

recharging procedure. Use Carrier PP33-1, Texaco

Capella B or Suniso 3G oil.

FAN MOTOR BEARINGS are prelubricated for 3

years heavy-duty or 5 years normal-duty service.

Cleaning Coil and Condensate Pan — Clean

and inspect coil, condensate pan and drain before

each cooling season.

1. Remove coil section access panels and slide air

filter out of filter flanges.

2. Disconnect condensate drain line at pan drain

connection.

3. Use vacuum cleaner nozzle to clean the face of

coil.

4. Clean condensate drain trap with a bottle brush.

Clean condensate pan.

5. Hold pail under condensate pan drain connec

tion and flush pan out with clean water. Ensure

water flows freely thru condensate drain. Do

not overflow pan.

6. Reconnect condensate drain line.

7. Install access panel and air filter.

Indoor Fan Wheel should be centered in housing.

To adjust fan, loosen setscrew holding fan to

motor shaft. Adjust fan and retighten setscrew.

50VQ INDOOR BLOWER ASSEMBLY

REMOVAL

1. Remove fan section access panel.

2. Remove power wires from Molex plug.

3. Place a spacer beneath blower housing for

support.

4. Remove blower assembly mounting bracket.

(Rear flange on top of blower housing and

screws now hold blower assembly in place.)

5. Support blower housing at bottom and remove

spacer. Tilt blower assembly downward and lift

out of unit.

50HQ INDOOR BLOWER ASSEMBLY

REMOVAL

1. Remove top cover (Fig. 2).

2. Remove power wires from Molex connector

(Fig. 7).

3. Remove blower assembly mounting screws from

base unit (Fig. 2).

4. Lift blower assembly out of unit.

Indoor Fan and Motor Removal

1. Remove blower assembly from unit.

2. Remove Molex plug from bracket on fan

housing.

3. Loosen setscrew holding fan to motor shaft.

4. Loosen motor mounting band and remove

motor.

5. Remove fan cutoff plate from blower housing

outlet.

6. Remove fan wheel from blower housing outlet.

Clean Indoor Fan Wheel — When coil is cleaned,

remove caked-on dirt from fan wheel and housing

with brush; remove grease with mild solvent. When

replacing blower assembly, make sure fan wheel is

centered in housing.

Return Air Filter — Replace filter media 4 times a

year. For other types of filters, refer to filter manu

facturer’s instructions as required.

CAUTION; Nev«r operate unit W3tltcwi.t a filter

as coil wilt plug and damage to fan motor may

result.

Heat Exchanger — If excessive discharge pressure

is experienced with normal water flow, the heat

exchanger tubes may be fouled and require cleaning.

Contact a local water treatment firm for details on

chemical cleaning.

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Carrier 50HQ User Manual Page 12

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