Bryant 551B II. Lubrication, III. CONDENSER-FAN Adjustment FIG, IV. BELT/PULLEY Adjustment

Fig. 45 — Separating Coil Sections

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.

UNIT VOLTAGE	FAN HEIGHT “A” (in.)
208/230 v	2.75
460 v and 575 v	3.50

Fig. 46 — Condenser-Fan Adjustment

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.)

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