Bryant 581B Service Cleaning, II. Lubrication, IV. ECONOMI$ER IV Adjustment, Viii. Freeze-Stat

SERVICE

CAUTION: When servicing unit, shut off all elec- trical power to unit and install lockout tag to avoid shock hazard or injury from rotating parts.

I. CLEANING

Inspect unit interior at the beginning of heating and cooling season and as operating conditions require.

A.Evaporator Coil

1.Turn unit power off, tag disconnect. Remove evapora- tor coil access panel.

2.If economizer or two-position damper is installed, remove economizer by disconnecting Molex plug and removing mounting screws. Refer to accessory econo- mizer installation instructions or Optional EconoMi$er IV section on page 15 for additional information.

3.Slide filters out of unit.

4.Clean coil using a commercial coil cleaner or dish- washer detergent in a pressurized spray canister. Wash both sides of coil and flush with clean water. For best results, back-flush toward return-air section to remove foreign material. Flush condensate pan after completion.

5.Reinstall economizer and filters.

6.Reconnect wiring.

7.Replace access panels.

B.Condenser Coil

Inspect coil monthly. Clean condenser coil annually, and as required by location and outdoor air conditions.

One-Row Coil

Wash coil with commercial coil cleaner. It is not necessary to remove top panel.

2-Row Coils

Clean coil as follows:

1.Turn off unit power, tag disconnect.

2.Remove top panel screws on condenser end of unit.

3.Remove condenser coil corner post. See Fig. 44. To hold top panel open, place coil corner post between top panel and center post. See Fig. 45.

4.Remove screws securing coil to compressor plate and compressor access panel.

5.Remove fastener holding coil sections together at return end of condenser coil. Carefully separate the outer coil section 3 to 4 in. from the inner coil section. See Fig. 46.

6.Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and debris. Clean the outer surfaces with a stiff brush in the normal manner.

7.Secure inner and outer coil rows together with a field- supplied fastener.

8.Reposition the outer coil section and remove the coil corner post from between the top panel and center post. Reinstall the coil corner post and replace all screws.

C.Condensate Drain

Check and clean each year at start of cooling season. In win- ter, keep drain dry or 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 Screens

Clean screen with steam or hot water and a mild detergent. Do not use disposable filters in place of screen.

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 con- denser-fan or evaporator-fan motors is required.

III. CONDENSER-FAN ADJUSTMENT (Fig. 47)

Shut off unit power supply. Remove condenser-fan assembly (grille, motor, motor cover, and fan) and loosen fan hub setscrews. Adjust fan height as shown in Fig. 47. Tighten setscrews and replace condenser-fan assembly.

IV. ECONOMI$ER IV ADJUSTMENT

Refer to Optional EconoMi$er IV section on page 15.

V. 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.

VI. HIGH-PRESSURE SWITCH

The high-pressure switch contains a Schrader core depressor, and is located on the compressor hot gas line. This switch opens at 428 psig and closes at 320 psig. No adjustments are necessary.

VII. LOSS-OF-CHARGE SWITCH

The loss-of-charge switch contains a Schrader core depressor, and is located on the compressor liquid line. This switch opens at 7 psig and closes at 22 psig. No adjustments are necessary.

VIII. FREEZE-STAT

The freeze-stat is a bimetal temperature-sensing switch that is located on the “hair-pin” end of the evaporator coil. The switch protects the evaporator coil from freeze-up due to lack of airflow. The switch opens at 30 F and closes at 45 F. No adjustments are necessary.

IX. REFRIGERANT CHARGE

Amount of refrigerant charge is listed on unit nameplate (also refer to Table 1). Refer to HVAC Servicing Procedures literature available at your local distributor and the follow- ing procedures.

Unit panels must be in place when unit is operating during charging procedure. Unit must operate a minimum of 10 minutes before checking or adjusting refrigerant charge.

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.

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