Service - Carrier 50HJQ016 Installation, Start-Up And Service Instructions Manual

DEFROST
THERMOSTAT
NOTE: Defrost thermostat is located at the bottom tee of circuit
no. 1 and the top tee of circuit no. 2.
Fig. 31 — Defrost Thermostat Location

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 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.
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. Observe the level in the
sight glass immediately after shutdown while the oil is still
warm. If the oil level is observed when the oil is cold, the level
observed may be a mixture of oil and refrigerant which is not a
true indication of the oil level. If oil level observed is not be-
tween the low limit and high limit levels as indicated in Fig. 32,
add oil until it is in the correct range.
FAN SHAFT BEARINGS — For size 014 units, bearings are
permanently lubricated. No field lubrication is required. For
size 016 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 annually.
Typical lubricants are given below:
MANUFACTURER
Texaco
Mobil
Sunoco
Texaco
*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, 50HJQ014 Units
PERFORMANCE ADJUSTMENT — Fan motor pulleys on
the 50HJQ014 units are factory set for speed shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting plate nuts.
3. Loosen movable-pulley flange setscrew (see Fig. 33).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed. In-
creasing fan speed increases load on motor. Do not ex-
ceed maximum speed specified in Table 1.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew.
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from
mounting plate.
SERVICE AND REPLACEMENT (see Fig. 34)
NOTE: To remove belts only, follow Steps 1-7.
1. Remove filter and supply-air section panels.
2. Remove unit top panel.
3. Remove coil guard.
4. Loosen screws A and B on both sides of motor mount
assembly.
5. Loosen screw C.
6. Rotate motor mount assembly (with motor attached) as
far as possible away from indoor coil.
7. Remove belt.
8. Rotate motor mount assembly back past original position
toward indoor coil.
9. Remove motor mounting nuts D and E (both sides).
10. Lift motor up through top of unit.
11. Reverse Steps 1-10 to install new motor.
12. Check and adjust belt tension as necessary.
Indoor Fan, 50HJQ016 Units
PERFORMANCE ADJUSTMENT — Fan motor pulleys are
factory set for speed shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen nuts on the 2 carriage bolts in the mounting base.
Install jacking bolt and plate under motor base (bolt and
plate are shipped in installer's packet). Using bolt and
plate, raise motor to top of slide and remove belt. Secure
motor in this position by tightening the nuts on the car-
riage bolts.
3. Loosen movable-pulley flange setscrew (See Fig. 33).
21
LUBRICANT
Regal AFB-2*
Mobilplex EP No. 1
Prestige 42
Multifak 2