SERVICE
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Tnm off accessory
heater power switch if applicable. Electrical shock could
cause pelNonal 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
interiol:
EVAPORATOR COIL -- Clean as required with a commer-
cial coil cleanel:
CONDENSER COIL--Clean condenser coil annually and
as required by location and outdoor-air conditions. Inspect coil
monthly -- clean as require&
CONDENSATE DRAIN- Check and clean each year at
start of cooling season. In wintel: keep drains and trap &T.
FILTERS -- Clean or replace at start of each heating and cool-
ing season, or more often if operating conditions require. Refer
to Table 1 for type and size.
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,
and 3GS oil may be used if the addition of oil is required. See
compressor nameplate for origimd oil charge. A complete re-
ch_uge should be four ounces less than the origimd 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 compressol: the extra oil will add rotor diag
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 compressol: The compressor should then be mn
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 015 units, bearings are
permanently lubricated. No field lubrication is required. For
size 017 units, the bearings are of the pillow block type and
have grease fittings. The bearing opposite the motor end has an
extended tube line so it can be lubricated from the motor side.
Lubricate the bearings twice annu_dly.
Typical lubricants _ue given 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.
CONDENSER AND EVAPORATOR-FAN MOTOR
BEARINGS -- The condenser-fan and evaporator-fan motors
have permanently sealed beguings, so no field lubrication is
necessguy.
Evaporator Fan Performance Adjustment
(Fig. 43-45) -- Fan motor pulleys are factory set for speed
shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. a Size 015 Only: Loosen belt by loosening fan motor
mounting plate nuts.
b. Size 017 Only: Loosen nuts on the 2 carriage bolts
in the motor mounting base. Install jacking bolt
and plate under motor base (bolt and plate are
shipped in installer's packet). See Fig, 45. Using
bolt and plate, raise motor to top of slide and
remove belt. Secure motor in this position by tight-
ening the nuts on the carriage bolts.
3. Ix_osen movable-pulley flange setscrew (see Fig. 43).
4. Screw movable flange tow_ud fixed flange to increase
speed and away from fixed flange to decrease speed. In-
creasing fan speed increases load on motol: Do not ex-
ceed mtcximum speed specified in Table 1.
See Table 14 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Table 1 for speed change for each
lhll turn of pulley flange.)
6. Replace and tighten belts. See Belt Tension Adjustment
section on page 36.
To align fan and motor pulleys:
1. Ix_osen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make anguku" alignment by loosening motor from
mounting plate.
Evaporator Fan Service and Replacement
50HJ015 UNITS (See Fig. 44)
NOTE: To remove belts only, follow Steps 1-6.
1. Remove filter and supply-air section panels.
2. Remove unit top panel.
3. Ix_osen cguriage nuts A and B holding motor mount as-
sembly to fan scroll side plates.
4. Ix_osen screw C.
5. Rotate motor mount assembly (with motor attached) as
far as possible away from evaporator coil.
6. Remove belt.
PULLEY
PULLEY
BE PARALLEL
WITH BELT
ENSURE PROPER
CLEARANCE BETWEEN
8ELT(_ AND FAN
MOTOR AND FAN
SHAFTS MUST BE
PARALLEL
MOVABLE
FLANGES
SETSCREWS
FIXED FLANGES
SINGLE-GROOVE
Fig. 43 -- Evaporator-Fan Pulley Alignment
and Adjustment
35
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