Bryant 541A Installation, Start-Up And Service Instructions Manual page 15

II. CRANKCASE HEATER
The crankcase heater prevents refrigerant migration and
compressor 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.
V. LUBRICATION
A. Fan Motors
Fan motors have permanently sealed bearings. No further
lubrication 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
This section describes how to clean and maintain standard
coils and E-coated aluminum-fin/copper-fin coils.
A. Standard Coils
The standard coils can be cleaned with a vacuum cleaner,
washed out with low velocity water, blown out with com-
pressed air, or brushed (do not use wire brush). Fan motors
are dripproof but not waterproof. Do not use acid cleaners;
use only pH neutral 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 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 sup-
port 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
secure 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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