Bryant 549B - Manual (Page 37)

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C. Condensate Drain
Check and clean each year at the start of the cooling season.
In winter, protect against freeze-up.
D. Filters
Clean or replace at the start of each heating and cooling
season, or more often if operating conditions require it.
Replacement filters must be the same dimensions as original
filters.
E. Outdoor-Air Inlet Screen
Clean the screen with stream or hot water and a mild deter-
gent. Do not use disposable filters in place of screens.
II. LUBRICATION
A. Compressors
Each compressor is charged with the correct amount of oil at
the factory.
B. Fan-Motor Bearings
Fan-motor bearings are permanently lubricated. No lubrica-
tion of outdoor or indoor-fan motors is required.
III. OUTDOOR-FAN ADJUSTMENT (Fig. 37)
1. Shut off the unit power supply, and install lockout tag
on disconnect.
2. Remove the outdoor-fan assembly (grille, motor,
motor cover, and fan) and loosen the fan hub
setscrews.
3. Adjust the fan height as shown in Fig. 37.
4. Tighten the setscrews and replace the outdoor-fan
assembly.
IV. BLOWER BELT ADJUSTMENT
Inspect the blower belt for wear, proper belt tension, and
pulley alignment as conditions require or at the beginning of
each heating and air conditioning season.
Refer to Step 7 — Adjust Indoor-Fan Speed on page 19 for
adjustment and alignment procedure.
V. ECONOMI$ER IV ADJUSTMENT
Refer to Optional EconoMi$er IV section on page 12.
VI. HIGH-PRESSURE SWITCH
Located on the compressor hot gas line is a high-pressure
switch with a Schrader core depressor. This switch opens at
428 psig and closes at 320 psig. No adjustment is necessary.
Refer to Table 1.
VII. LOSS OF CHARGE SWITCH
Located on the outdoor liquid line is a low-pressure switch
which functions as a loss-of-charge switch. This switch con-
tains a Schrader core depressor. This switch opens at 7 psig
and closes at 22 psig. No adjustment is necessary. Refer to
Table 1.
VIII. FREEZESTAT
Located on the “hair pin” end of the indoor coil is a bimetal
temperature sensing switch. This switch protects the indoor
coil from freeze-up due to lack of airflow. The switch opens at
30 F and closes at 45 F. No adjustment is necessary. Refer to
Table 1.
IX. REFRIGERANT CHARGE
The amount of refrigerant charge is listed on the unit name-
plate (also refer to Table 1).
Unit panels must be in place when the unit is operating dur-
ing charging procedure. The unit must operate for a mini-
mum of 10 minutes before checking or adjusting the charge.
A. No Charge
Use standard evacuating techniques. After evacuating the
system to 500 microns, weigh in the specified amount of
refrigerant (refer to Table 1).
B. Low Charge Cooling
Use Cooling Charging Charts, Fig. 38-40. Vary refrigerant
until the conditions of the appropriate chart are met. Note
that charging charts are different from the type normally
used. The charts are based on charging the units to the cor-
rect superheat for the various operating conditions. An accu-
rate pressure gage and temperature sensing device are
required. Connect the pressure gage to the service port on
the suction line. Mount the temperature sensing device on
the suction line and insulate it so that outdoor ambient tem-
perature does not affect the reading. Indoor-air cfm must be
within the normal operating range of the unit.
Fig. 37 — Outdoor Fan Adjustment
UNIT VOLTAGE ‘‘A’’ in.
208/230 V 2.75
460 V 3.50
Fig. 36 — Separating Coil Sections