SERVICE
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Turn off ac-
cessory heater power switch if applicable. Electrical shock
could cause personal injury.
ServiceAccess — All unit components can be reached
through clearly labelled hinged access doors. These doors
are not equipped with tiebacks, so if heavy duty servicing is
needed, either remove them or prop them open to prevent
accidental closure.
Each door is held closed with 3 latches. The latches are
secured to the unit with a single
1
⁄
4
-in.-20x
1
⁄
2
-in. long bolt.
See Fig. 37.
To open, loosen the latch bolt using a
7
⁄
16
-in. wrench. Pivot
the latch so it is not in contact with the door. Open the door.
To shut, reverse the above procedure.
NOTE: Disassembly of the top cover may be required under
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 replace-
ment of the top cover onto the unit and prevent rainwater
from leaking into the unit.
IMPORTANT:After servicing is completed, make sure
door is closed and relatched properly, and that the latches
are tight. Failure to do so can result in water leakage
into the evaporator section of the unit.
Cleaning — Inspect unit interior at beginning of each heat-
ing and cooling season and as operating conditions require.
Remove unit top panel and/or side panels for access to unit
interior.
INDOOR COIL — Clean as required with a commercial coil
cleaner.
OUTDOOR COIL — Clean outdoor 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. In winter, keep drains and traps dry.
FILTERS — Clean or replace at start of each heating and
cooling season, or more often if operating conditions re-
quire. Refer to Table 1 for type and size.
NOTE: The unit requires industrial grade throwaway filters
capable of withstanding face velocities up to 625 fpm.
OUTDOOR-AIR INLET SCREENS — Clean screens with
steam or hot water and a mild detergent. Do not use throw-
away filters in place of screens.
Lubrication
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory. The correct oil charge is
shown in Table 1. If oil is visible in the compressor sight
glass, check unit for operating readiness as described in Start-Up
section, then start the unit. Observe oil level and add oil, if
required, to bring oil level in compressor crankcase up to
between
1
⁄
4
and
1
⁄
3
of sight glass during steady operation.
If oil charge is above
1
⁄
3
sight glass, do not remove any oil
until the compressor crankcase heater has been energized for
at least 24 hours with compressor off.
When additional oil or a complete charge is required, use
only Carrier-approved compressor oil:
Petroleum Specialties, Inc. .................Cryol 150
Texaco, Inc. .........................Capella WF-32
Witco Chemical Corp. ...................Suniso 3GS
IMPORTANT: Do not use reclaimed oil or oil that has
been exposed to the atmosphere. Refer to Carrier Stand-
ard Service Techniques Manual, Chapter 1, Refriger-
ants section, for procedures to add or remove oil.
FAN SHAFT BEARINGS — Lubricate the bearings at least
twice annually with suitable bearing grease. Do not over grease.
Typical lubricants are show below:
MANUFACTURER LUBRICANT
Texaco Regal AFB-2*
Mobil Mobilplex EP No. 1
Sunoco Prestige 42
Texaco Multifak 2
*Preferred lubricant because it contains rust and oxidation inhibitors.
OUTDOOR AND INDOOR-FAN MOTOR BEARINGS —
The outdoor and indoor-fan motors have permanently-
sealed bearings, so no field lubrication is necessary.
Indoor Fan Performance Adjustment (Fig. 38)
—
Fan motor pulleys are factory set for speed shown in
Table 1 (factory speed setting).
To change fan speeds, change pulleys.
To align fan and motor pulleys:
1. Shut off unit power supply.
2. Loosen fan shaft pulley bushing.
3. Slide fan pulley along fan shaft.
4. Make angular alignment by loosening motor from mount-
ing plate.
5. Retighten pulley.
IMPORTANT: Check to ensure that the unit drive
matches the duct static pressure in Table 11.
Indoor Fan Service and Replacement
1. Turn off unit power.
2. Remove supply-air section panels.
3. Remove belt and blower pulley.
4. Loosen set screws in blower wheels.
5. Remove locking collars from bearings.
Fig. 37 — Door Latch
29
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