Carrier 50HJ015 - Service; Awarning; Before Performing Service or Maintenance Operations; Shock Could Cause Personal Injury

Table 7 - Accessory/FlOP Static Pressure Drop* (in. wg)
UNIT
50HJ
UNIT
VOLTAGE
208/230-3-60
015
460-3-60
575-3-60
208/230-3-60
024
460-3-60
575-3-60
CFM
4,000
5,000
6,000
7,200
4,000
5,000
6,000
7,200
4,000
5,000
6,000
7,200
0 05
0.07
0 09
ELECTRIC HEATERS
(kW)
(14-34) 0 06 (42) 0 07 (56)
14-34 0.08 42 0.10(56
(14-34) 0 12 (42) 0.15 (56)
El
05 (15,32) 0.06
(55)
0
07 15,32 0 08
(55)
0 09 (15,32)
012 55)
0.06 (37)
0 08 37)
0 12 37
0 15 37)
ECONOMIZER
0^3
0 05
0.07
0 09
0 03
0 05
0.07
0 09
0 03
0.05
0 07
0 09
6,000
0 09 (26/34) 0 12 (42/56) 0 15 56/75
0 07
7,200
0 11 26/34 0 16 42/56 0 20 56/75
0 09
9,000
0 15 26/34 0 19 42/56 0 24 56/75
0.11
10,000
0.17 26/34 0.21 (42/56) 0.26 (56/75)
0 12
6,000
7,200
9,000
10,000
0.09 (32) 0.12 (55) 0.15 (80)
0 11 32 0.15 (55 0 20 80
0 15 (32 0 19 55 0 24 (80
0.17(32) 0 21 (55) 0.26 (80)
6,000
_
7,200
—
9,000
—
10,000
—
0 07
0 09
0.11
0.12
0 07
0 09
0.11
0 12
FIOP — Factory-Installed Option NOTE: Heaters are rated at 208/240 v, 480 v, and 575 v
"The static pressure must be added to external static pressure The sum and
the evaporator entering air cfm should then be used in conjunction with the
Fan Performance table to determine blower rpm and watts
SERVICE
A WARNING
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 re¬
quire. Remove unit top panel and/or side panels for access
to unit interior.
EVAPORATOR COIL — Clean as required with a com¬
mercial 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
cooling season, or more often if operating conditions re¬
quire. 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 dis¬
posable filters in place of screens.
Lubrication
COMPRESSORS — Each compressor is charged with cor¬
rect amount of oil at the factory. Observe the oil level in
the sight glass at start-up. If unit oil level is below sight
glass, add oil until level is approximately l A sight glass.
FAN SHAFT BEARINGS — The bearings are of the pil¬
low block type and have grease fittings. The bearing oppo¬
site 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
LUBRICANT
Texaco
Reqal 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 BEAR¬
INGS — The condenser and evaporator-fan motors have
permanently-sealed bearings, so no field lubrication is
necessary.
Evaporator Fan, 50HJ015 Units
PERFORMANCE ADJUSTMENT — Fan motor pulleys on
the 50HJ015 units are factory set for speed shown in
Table I.
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. 19).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to deccrease speed.
Increasing fan speed increases load on motor. Do not
exceed maximum speed specified in Table 1.
5. Set movable flange at nearest key way of pulley hub and
tighten setscrew. (See Table 1 for speed change for each
full turn of pulley flange.)
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 mount¬
ing plate.
SERVICE AND REPLACEMENT (see Fig. 20)
NOTE: To remove belts only, follow Steps 1-7.
1. Remove filter and supply-air section panels.
2. Remove unit to cover.
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 evaporator coil.
7. Remove belt.
12