II. LUBRICATION

A. Compressors

Each compressor is charged with correct amount of oil at the factory.

B. Fan-Motor Bearings

Fan-motor bearings are of the permanently lubricated type. No further lubrication is required. No lubrication of condenser-fan or evaporator-fan motors is required.

III. EVAPORATOR FAN BELT INSPECTION

Check condition of evaporator belt or tension during heating and cooling inspections or as conditions require. Replace belt or adjust as necessary. Refer to Step 7 — Adjust Evaporator- Fan Speed on page 31 for proper adjustment procedures and belt tension.

IV. CONDENSER-FAN ADJUSTMENT (Fig. 40)

1.Shut off unit power supply, lockout and tag the disconnect.

2.Remove condenser-fan assembly (grille, motor, motor cover, and fan) and loosen fan hub setscrews.

3.Adjust fan height as shown in Fig. 40.

4.Tighten setscrews.

5.Replace condenser-fan assembly.

V. MANUAL OUTDOOR-AIR DAMPER

If outdoor-air damper blade adjustment is required, see Manual Outdoor-Air Damper section on page 22.

VI. ECONOMIZER ADJUSTMENT

Refer to Optional EconoMi$er IV section on page 23.

VII. REFRIGERANT CHARGE

A. Checking and Adjusting Refrigerant Charge

The refrigerant system is fully charged with R-22 refriger- ant, tested, and factory-sealed. Unit must operate in Cooling mode a minimum of 10 minutes before checking charge.

NOTE: Adjustment of the refrigerant charge is not required unless the unit is suspected of not having the proper R-22 charge.

A superheat charging chart is attached to the outside of the service access panel. The chart includes the required suction line temperature at given suction line pressures and outdoor ambient temperatures.

An accurate superheat, thermocouple-type or thermistor- type thermometer, and a gage manifold are required when using the superheat charging method for evaluating the unit charge. Do not use mercury or small dial-type thermometers because they are not adequate for this type of measurement.

CAUTION: When evaluating the refrigerant charge, an indicated adjustment to the specified fac- tory charge must always be very minimal. If a substan- tial adjustment is indicated, an abnormal condition exists somewhere in the cooling system, such as insuf- ficient airflow across either coil or both coils.

Proceed as follows:

1.Remove caps from low-pressure and high-pressure service fittings.

2.Using hoses with valve core depressors, attach low- pressure and high-pressure gage hoses to low- pressure and high-pressure service fittings, respectively.

3.Start unit in Cooling Mode and let unit run until sys- tem pressures stabilize.

4.Measure and record the following:

a.Outdoor ambient-air temperature (F db).

b.Evaporator inlet-air temperature (F wb).

c.Suction-tube temperature (F) at low-side service fitting.

d.Suction (low-side) pressure (psig).

5.Using “Cooling Charging Charts” compare outdoor- air temperature (F db) with the suction line pressure (psig) to determine desired system operating suction line temperature. See Fig. 41-48.

6.Compare actual suction-tube temperature with

desired suction-tube temperature. Using a tolerance of ± 3° F, add refrigerant if actual temperature is more than 3° F higher than proper suction-tube tem-

perature, or remove refrigerant if actual temperature is more than 3° F lower than required suction-tube temperature.

558F

FAN HEIGHT

‘‘A’’, in.

 

208/230 V

2.75

460 and 575 V

3.50

Fig. 40 — Condenser Fan Adjustment

57

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Bryant 558F II. Lubrication, III. Evaporator FAN Belt Inspection, Manual OUTDOOR-AIR Damper, VI. Economizer Adjustment

558F specifications

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