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C. Condensate Drain
Check and clean each year at start of cooling season. In win-
ter, protect against freeze-up.
D. Filters
Clean or replace at start of each heating and cooling season,
or more often if operating conditions require it. Replacement
filters must be same dimensions as original filters.
E. Outdoor-Air Inlet Screen
Clean screen 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 correct amount of oil from
the factory.
B. Fan Motor Bearings
Fan motor bearings are permanently lubricated. No further
lubrication of condenser-fan or evaporator-fan motors is
required.
III. CONDENSER-FAN ADJUSTMENT (FIG. 46)
1. Shut off unit power supply and install lockout tag.
2. Remove condenser-fan assembly (grille, motor, motor
cover, and fan) and loosen fan hub setscrews.
3. Adjust fan height as shown in Fig. 46.
4. Tighten setscrews and replace condenser-fan assembly.
IV. BELT/PULLEY ADJUSTMENT
Inspect once each season or sooner if conditions warrant,
verifying that belt tension and pulley alignment are correct.
Replace belt if required.
V. ECONOMI$ER IV ADJUSTMENT
Refer to Optional EconoMi$er IV section on page 13.
VI. REFRIGERANT CHARGE
Amount of refrigerant charge is listed on unit nameplate
(also refer to Table 1). Refer to Bryant Standard Service
Techniques Manual, Chapter 1, Refrigerants section.
Unit panels must be in place when unit is operating during
charging procedure.
A. No Charge
Locate and repair any refrigerant leak. Use standard evacu-
ating techniques. After evacuating system, weigh in the
specified amount of refrigerant (refer to Table 1).
B. Low Charge Cooling
Use Cooling Charging Charts, Fig. 47-50. Vary refrigerant until
the conditions of the appropriate chart are met. Note that charg-
ing charts are different from the type normally used. Charts are
based on charging the units to the correct superheat for the var-
ious operating conditions. Accurate pressure gage and tempera-
ture 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 temperature does not affect the reading. Indoor-air cfm
must be within the normal operating range of the unit.
C. Perfect Humidity™ System Charging
The system charge for units with the Perfect Humidity option is
greater than that of the standard unit alone. The charge for
units with this option is indicated on the unit nameplate draw-
ing. Also refer to Fig. 51-53. To charge systems using the Perfect
Humidity dehumidification system, fully evacuate, recover and
recharge the system to the nameplate specified charge level.
To check or adjust refrigerant charge on systems using the
Perfect Humidity Dehumidification system, charge per
Fig. 51-53.
NOTE: When using the charging charts, it is important that
only the subcooling/reheat dehumidification coil liquid line
solenoid valve be energized. The subcooling/reheat dehumid-
ification coil liquid line solenoid valve MUST be energized to
use the charging charts and the outdoor motor speed control-
ler jumpered to run the fan at full speed.
The charts reference a liquid pressure (psig) and tempera-
ture at a point between the condenser coil and the
subcooling/reheat dehumidification coil. A tap is provided on
the unit to measure liquid pressure entering the subcooling/
reheat dehumidification coil.
IMPORTANT: The subcooling mode charging charts
(Fig. 51-53) are to be used ONLY with units having the
optional Perfect Humidity dehumidification system. DO NOT
use standard charts (Fig. 47-50) for units with Perfect Humid-
ity option, and DO NOT use Fig. 51-53 for standard units.
D. To Use Cooling Charging Charts, Standard Units
Take the outdoor ambient temperature and read the suction
pressure gage. Refer to appropriate chart to determine what
the suction temperature should be. If suction temperature is
high, add refrigerant. If suction temperature is low, carefully
recover some of the charge. Recheck the suction pressure as
charge is adjusted.
EXAMPLE (Fig. 47):
Circuit 1
Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F
Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 psig
Suction Temperature should be . . . . . . . . . . . . . . . . . . 46 F
(Suction Temperature may vary ±5° F.)
Fig. 45 — Separating Coil Sections
Fig. 46 — Condenser-Fan Adjustment
UNIT VOLTAGE FAN HEIGHT “A” (in.)
208/230 v 2.75
460 v and 575 v 3.50