Carrier 50LJ User Manual download pdf (Page 25)

NOTE: Disassembly of the top cover may be required un

der special service circumstances. It is very important that

the orientation and position of the top cover be marked on

the unit prior to disassembly. This will allow proper place

ment of the top cover onto the unit and prevent rain water

from leaking into the unit.

IMPORTANT: After servicing is completed, make sure

door and panels are closed and latched properly, and

that all latches are tight and all screws are replaced

and tight. Failure to do this can result in water leak

age into the evaporator section of the unit.

COMPRESSORS — Access to the compressors is through

the access panel on the right side of the unit (when facing

the condenser coil). This panel also provides access to the

crankcase heaters and the high- and low-pressure switches.

Compressor no. 1 is compressor closest to the condenser

coil.

EVAPORATOR-FAN MOTORS, PULLEYS, AND BELTS

— Access to these components is through the panel labeled

FAN SECTION on the left side of the unit (when facing

condenser coil).

FILTER DRIERS — Access to the filter driers is through

the panel on the right on the evaporator end of the unit (end

opposite the condenser coil).

UNIT CONTROL BOX — Access to this component is

through the panel marked ELECTRICAL SECTION on the

left side of the unit (when facing condenser coil). See

Fig. 14 for control box component locations.

GAS HEAT SECTION — Access to the gas heat section is

through the panel labeled HEAT SECTION on the left side

of the unit (when facing condenser coil). See Fig. 21

and 22.

All gas system components are in the gas section, except

the limit switch(es). Find the limit switch(es) in the upper

right side of the compressor section, behind the suction bell

of the right compressor. Limit switch(es) is covered by a

rainshield and held in place by 2 screws.

MAIN AND PILOT BURNERS — At the beginning of each

heating season, inspect for deterioration due to corrosion or

other causes. Observe the pilot and main burner flames through

the viewport (contained in the condenser section), and ad

just if necessary. See Automatic Pilot Adjustment section

on page 28 or Main Burner Adjustment section on page 28.

FLUE GAS PASSAGEWAYS — The flue collector box

and heat exchanger cells may be inspected by removing the

combustion-air blower(s), flue box cover, and main burner

assembly. See Fig. 21 and 22 for proper removal sequence.

If cleaning is required, remove heat exchanger baffles through

the flue box and clean all parts with a wire brush. When

replacing heat exchanger baffles, be sure to replace screw

through clamp on baffle retaining rod into the vestibule plate.

COMBUSTION-AIR BLOWER — Clean periodically to

assure proper airflow and heating efficiency. Inspect blower

wheel every fall and periodically during the heating season.

For first heating season, inspect blower wheel bimonthly to

determine proper cleaning frequency. Inspect wheel by shin

ing a flashlight into the opening. If cleaning is required,

remove blower assembly from unit and then disassemble as

shown in Fig. 23.

ELECTRIC HEAT CONTROL BOX (Fig. 24)

5QLJ Units — On these units, access to the electric heat

control box is through the panel marked FAN SECTION on

the back end of the unit. (End opposite condenser coil.) Be

sure to use the correct panel, as there are 3 panels labeled

FAN SECTION.

50LW Units — On these units, access to the electric heat

control box is through the panel marked HEAT SECTION.

HEATER BOX

50LJ Units — Access to the heater box on these units is

through the last panel on the left side of the unit (when

facing condenser coil). Panel is marked FAN SECTION.

Box is mounted directly under evaporator fan.

50LW Units — Access to the heater box on these units is

through the panel marked HEAT SECTION.

NOTE: Only the heater element connectors are located in

the heater box. The heater elements themselves are in the

airstream.

BURNER SECTION

Fig. 21 — Gas Section Detail,

48LJD (Low Heat)

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 37 38

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Carrier 50LJ User Manual Page 25

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