Carrier 50LJ - Manual (Page 26)

V I E W A - A
BURNER SECTION
Fig. 22 - Gas Section Detaii,
48LJE (High Heat)
Fig. 23 — Combustion Blower Removal
LEGEND
FB — Fuse Block
FU - Fuse
HC - Heater Contactor ELECTRIC HEAT BOX
ECONOMIZER DAMPER MOTOR — On units so equipped,
the economizer motor is located on a bracket in the return-
air section. Access to it is through the panel labeled FIL­
TER SECTION on the far end of the unit (when facing
condenser coil).
POWER EXHAUST MOTOR — Remove the power ex­
haust hood to gain access to motor.
RETURN-AIR FILTERS — Access to these filters is through
the panel marked FILTER SECTION.
CONDENSER FANS AND FAN MOTORS - Remove the
wire fan guard on top of the unit to gain access to the con­
denser fans and motors.
Cleaning — inspect unit at the beginning of each heat­
ing and cooling season and during each season as operating
conditions may require.
Clean condenser coil with a vacuum cleaner, fresh
water, compressed air, or a bristle brush (not wire). Coil
cleaning should be a part of the planned maintenance pro­
gram. Clean evaporator coil with a stiff bristle brush (not
wire), vacuum cleaner, or compressed air.
Check and clean condensate drain annually at the start of
the cooling season. In winter, keep drain and traps dry and
protect against freeze-up.
Replace return-air filters at the start of each heating and
cooling season and as often as necessary during each
season, depending on operating conditions. See Tables la
and lb for filter types, quantities, and sizes.
Remove economizer outdoor-air filters from the hoods
by removing the filter retainers. Clean filters with steam or
hot water and mild detergent. Reinstall in hoods after clean­
ing. Never replace cleanable filters with disposable filters.
Lubrication
COMPRESSORS — Each compressor is correctly charged
at the factory.
FAN SHAFT BEARINGS — Lubricate fan shaft bearings
at least once a year with suitable bearing grease. Typical
lubricants are given below:
MANUFACTURER LUBRICANT
Texaco Regal AFB-2*
Sunoco Prestige 42
Texaco Multifak 2
Mobil Mobilplex EP No. 1
Fig. 24 — Typical Electric Heat Control Box
Component Arrangement
’Preferred lubricant because it contains rust and oxidation
inhibitors.
FAN MOTOR BEARINGS — The condenser-fan motors
and the evaporator-fan motor(s) have sealed bearings, so no
field lubrication is required.
DOOR HINGES — The control box door hinges should be
lubricated at least once a year.
Adjustments
EVAPORATOR-FAN MOTOR PLATE — Adjust using a
'Vie-in. wrench on the bolts shown in Fig. 25 and 26. Turn
the bolts counterclockwise to move the motor mounting plate
toward the fan and loosen the belts; turn clockwise to move
the plate away from the wheel and tighten the belts. Make
the same number of turns to each bolt.
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