Bryant 541A - Manual (Page 15)

II. CRANKCASE HEATER
The crankcase heater prevents refrigerant migration and com-
pressor oil dilution during shutdown when compressor is not
operating.
Close both compressor service valves when crankcase heater
is deenergized for more than 6 hours.
III. OUTDOOR UNIT FANS
Each fan is supported by a formed-wire mount bolted to the
fan deck and covered with a wire guard. The exposed end of
the motor shaft is covered with a rubber boot. In case a fan
motor must be repaired or replaced, be sure the rubber boot
is put back on when the fan is reinstalled and be sure the fan
guard is in place before starting the unit. Figure 14 shows
the proper position of the mounted fan.
IV. LUBRICATION
A. Fan Motors
Fan motors have permanently sealed bearings. No further lu-
brication is required.
B. Compressor
Compressor has its own oil supply. Loss of oil due to a leak in
the system should be the only reason for adding oil after the
system has been in operation. See Start-Up, Preliminary Oil
Charge.
V. CLEANING COILS
The coils can be cleaned with a vacuum cleaner, washed out
with low velocity water, blown out with compressed air, or
brushed (do not use wire brush). Fan motors are dripproof
but not waterproof. Do not use acid cleaners.
Clean coil annually or as required by location or outdoor air
conditions. Inspect coil monthly and clean as required. Fins
are not continuous through coil sections. Dirt and debris may
pass through first section, become trapped between the 2 rows
of fins (541A120) or 3 rows of fins (541A180), and restrict con-
denser airflow. Use a flashlight to determine if dirt or debris
has collected between coil sections.
Clean coils as follows:
1. Turn off unit power.
2. Remove screws holding rear corner posts and top cover
in place. Pivot top cover up 12 to 18 in. and support with
a board or other adequate rigid support. See Fig. 15.
3. Remove clips securing tube sheets together at the return-
bend end of the coil. Carefully spread the ends of
the coil rows apart by moving the outer sections. See
Fig. 16.
4. Using a water hose or other suitable equipment, flush
down between the sections of coil to remove dirt and
debris.
5. Clean the remaining surfaces in the normal manner.
6. Reposition outer coil sections. Reinstall clips which se-
cure tube sheets, and replace top cover and rear corner
posts.
7. Restore unit power.
Fig. 14 — Outdoor Unit Fan
Fig. 15 — Pivot and Support Top Cover
Fig. 16 — Coil Cleaning (541A120 Shown)
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