Service - Carrier 50TJ016-028 Installation, Start-Up And Service Instructions Manual

UNIT UNIT RATED
50TJ VOLTAGE
016
024
028
LEGEND
Bhp — Brake Horsepower
BkW — Fan Input Watts x Motor Efficiency
NOTE: The CRRFCURB013A00 high-static regain adapter acces-
sory may be used to provide horizontal supply/return.
Fig. 36 — Horizontal Supply/Return Fan Performance with CRRFCURB013A00 High-Static Regain Adapter

SERVICE

Before performing service or maintenance operations on
unit, turn off main power switch to unit. Turn off accessory
heater power switch if applicable. Electrical shock could
cause personal injury.
Cleaning —
Inspect unit interior at beginning of each
heating and cooling season and as operating conditions require.
Remove unit top panel and/or side panels for access to unit
interior.
EVAPORATOR COIL — Clean as required with a commer-
cial coil cleaner.
CONDENSER COIL — Clean condenser coil annually and
as required by location and outdoor-air conditions. Inspect coil
monthly — clean as required.
CONDENSATE DRAIN — Check and clean each year at
start of cooling season.
FILTERS — Clean or replace at start of each heating and cool-
ing season, or more often if operating conditions require. Refer
to Tables 1A and 1B for type and size.
NOTE: The 50TJ028 unit requires industrial grade throwaway
filters capable of withstanding face velocities up to 3.2 m/s
Table 19 — Evaporator-Fan Motor Performance
MAXIMUM
ACCEPTABLE
CONTINUOUS
BHP*
220 3.45
400 4.25
220 10.30
400 10.30
220 11.50
400 13.30
MAXIMUM
ACCEPTABLE ACCEPTABLE
CONTINUOUS OPERATING
BkW*
2.57
3.17
7.68
7.68
8.60
9.92
*Extensive motor and electrical testing on these units ensures that
the full horsepower and kilowatt ranges of the motors can be uti-
lized with confidence. Using your fan motors up to the horsepower
or kilowatt ratings shown in this table will not result in nuisance trip-
ping or premature motor failure. Unit warranty will not be affected.
NOTE: The CRRFCURB013A00 horizontal supply and return adapter
accessory improves 50TJ fan performance by increasing external static
pressure by amount shown above.
(625 fpm). Ensure that replacement filters for the 50TJ028
units are rated for 3.2 m/s (625 fpm).
OUTDOOR-AIR INLET SCREENS — Clean screens with
steam or hot water and a mild detergent. Do not use throwaway
filters in place of screens.
Lubrication
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory. Conventional white oil
(Sontext 200LT) is used. White oil is compatible with 3GS oil,
3GS oil may be used if the addition of oil is required. See com-
pressor nameplate for original oil charge. A complete recharge
should be four ounces (89 mL) less than the original oil charge.
When a compressor is exchanged in the field it is possible that
a major portion of the oil from the replaced compressor may
still be in the system. While this will not affect the reliability of
the replacement compressor, the extra oil will add rotor drag
and increase power usage. To remove this excess oil, an access
valve may be added to the lower portion of the suction line at
the inlet of the compressor. The compressor should then be run
for 10 minutes, shut down, and the access valve opened until
no oil flows. This should be repeated twice to make sure the
proper oil level has been achieved.
FAN SHAFT BEARINGS — For size 016 units, bearings are
permanently lubricated. No field lubrication is required. For
size 024 and 028 units, the bearings are of the pillow block type
and have grease fittings. The bearing opposite the motor end
26
MAXIMUM
MAXIMUM
AMP DRAW
WATTS
3,065 9.4
3,775 4.8
8,640 26.0
8,640 13.0
9,600 36.0
11,000 14.6