Bryant DURAPAC 579F - Manual (Page 30)

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7. Ensure cleaner thoroughly penetrates deep into
finned areas.
8. Interior and exterior finned areas must be thoroughly
cleaned.
9. Finned surfaces should remain wet with cleaning
solution for 10 minutes.
10. Ensure surfaces are not allowed to dry before rinsing.
Reapplying cleaner as needed to ensure 10-minute
saturation is achieved.
11. Thoroughly rinse all surfaces with low velocity clean
water using downward rinsing motion of water spray
nozzle. Protect fins from damage from the spray
nozzle.
E. Condensate Drain
Check and clean each year at start of cooling season. In
winter, keep drains and traps dry. During periods of low
outdoor temperatures, add anti-freeze to the condensate trap
to prevent freezing. Follow all precautions on anti-freeze
labeling.
F. Filters
Clean or replace at start of each heating and cooling season,
or more often if operating conditions require. Refer to Table 1
for type and size.
NOTE: The 579F300 unit requires industrial grade throw-
away filters capable of withstanding face velocities up to
625 fpm. Ensure that replacement filters for the 579F300
units are rated for 625 fpm.
G. Outdoor-Air Inlet Screens
Clean screens with steam or hot water and a mild detergent.
Do not use throwaway filters in place of screens.
II. LUBRICATION
A. 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 name-
plate for original oil charge. A complete recharge should be
four ounces less than the original oil charge. When a com-
pressor 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.
B. Fan Shaft Bearings
For size 180 units, bearings are permanently lubricated. No
field lubrication is required. For size 216-300 units, lubricate
bearings at least every 6 months with suitable bearing grease.
Extended grease line is provided for far side fan bearing
(opposite drive side). Typical lubricants are given below:
*Preferred lubricant because it contains rust and oxidation inhibitors.
C. Condenser and Evaporator-Fan Motor Bearings
The condenser-fan and evaporator-fan motors have
permanently sealed bearings, so no field lubrication is
necessary.
III. EVAPORATOR FAN PERFORMANCE ADJUSTMENT
(Fig. 38-40)
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 180 Only: Loosen belt by loosening carriage
nuts holding motor mount assembly to fan scroll
side plates (A and B).
b. Size 216-300 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). Using bolt and
plate, raise motor to top of slide and remove belt.
Secure motor in this position by tightening the
nuts on the carriage bolts.
3. Loosen movable-pulley flange setscrew (see Fig. 38).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed.
Increasing fan speed increases load on motor. Do not
exceed maximum speed specified in Table 1.
5. See Table 19 for air quantity limits.
6. Set movable flange at nearest keyway of pulley hub
and tighten setscrew. (See Table 1 for speed change
for each full turn of pulley flange.)
7. Replace and tighten belts. See Belt Tension Adjust-
ment section on page 31.
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.
MANUFACTURER LUBRICANT
Texaco Regal AFB-2*
Mobil Mobilplex EP No. 1
Sunoco Prestige 42
Texaco Multifak 2
Fig. 38 — Evaporator-Fan Pulley and Adjustment