Carrier 38ED User Manual download pdf (Page 10)

COMPRESSOR INTERNAL TEMPERATURE

AND/OR CURRENT SENSITIVE OVER

LOADS reset automatically when motor internal

temperatures drop to a safe level (overload may

require up to 30 minutes to reset). When internal

overload is suspected of being open, check by using

an ohmmeter or continuity tester. If necessary, refer

to Carrier Standard Service Techniques Manual,

Chapter 2, Electrical, for complete instructions.

INHERENT FAN MOTOR PROTECTION pro

tects motor from abnormal current and temperature.

SOLID-STATE TIME GUARD II CIRCUIT,

protects unit compressor by preventing short

cycling. Time Guard II circuit provides a 5 ± 2-

minute delay before restarting compressor after

shutdown for any reason. On normal start-up, the 5-

minute delay occurs before thermostat closes. After

thermostat closes, the Time Guard II circuit then

provides a 3-second delay to prevent contactor

chattering.

CRANKCASE HEATER — The purpose of the

heater is to keep the crankcase warm during the

off cycle and thus prevent dilution of the oil with

refrigerant. This assures good lubrication and pre

vents loss of oil from crankcase during start-up.

CRANKCASE HEATER RELAY deactivates

heater when compressor is operating for maximum

energy efficiency.

Compatible Fitting Repair

MECHANICAL CONNECTION — Frontseat unit

service valves. Relieve refrigerant pressure from

tubing. Back off locknut from Compatible Fitting

onto tube. Cut fitting between threads and O-ring

as shown in Fig. 9. Remove tubing section remain

ing in threaded portion of fitting. Discard locknut.

Clean, flux and insert new tube end into remaining

portion of Compatible Fitting. Wrap valve base in

wet rag. Heat and apply low-temperature (430 F)

solder.

Fig. 9 — Repair of Mechanical Connection

SWEAT CONNECTION — Frontseat unit service

valve. Relieve refrigerant pressure from tubing.

Clean and flux area around leak. Repair using low-

temperature (430 F) solder.

Evacuate or purge evaporator coil and tubing

system. Add refrigerant charge. See Refrigerant

Charging instructions described previously.

Condenser Fan Adjustment — Required fan

position is shown in Fig. 10. Adjust fan by loosening

setscrew(s) and moving fan blade up or down.

Condenser Fan Motor Removal

1. Shut off power to unit. Failure to do so may

result in electric shock or injury from rotating fan

blade.

2. Remove top cover by loosening screws and lift

ing straight up.

3. Disconnect fan motor leads from control leads.

See Fig. 8.

4. Remove Carrier medallion by turning 4 Tinner-

man fasteners 1/4 turn each.

5. Remove screws holding fan motor/discharge

grille in place and lift assembly from unit.

6. Remove 4 nuts holding fan motor to discharge

grille. Remove motor and leads.

7. Reassembly is reverse of above procedure. Make

sure fan is positioned correctly as in Fig. 10.

Fig. 10 — Condenser Fan Position

MAINTENANCE

Lubrication

COMPRESSOR contains factory oil charge. Re

place oil when lost. See Table 8 for oil recharge and

refer to Carrier Standard Service Techniques

Manual, Chapter 1, page 1-21, for oil recharging

procedure. Use Carrier PP33-1, Texaco WFI-32 or

Suniso 3GS oil.

FAN MOTOR BEARINGS are prelubricated for 3

years heavy duty or 5 years normal duty. When

lubrication is necessary, send motor to authorized

motor repair shop.

Coil Repair — A flare-union coupling repair kit is

available, with instructions, from Carrier Service

parts.

Coil Cleaning to be done at the beginning of

each cooling season or more often if required.

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Carrier 38ED User Manual Page 10

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