Manuals / Bryant / Household Appliance / Air Conditioner

Bryant 27, Evaporator-FanPulley Alignment, and Adjustment, 551A180,240 Evaporator-Fan

Models: 551A

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Fig. 30 — Evaporator-Fan Pulley Alignment

3. Loosen nuts on the two carriage bolts in the motor mounting base.

4. Using jacking bolt under motor base, raise motor to top of slide and remove belt. Secure motor in this position by tightening the nuts on the carriage bolts.

5. Remove the belt drive.

6. Remove jacking bolt and tapped jacking bolt plate.

7. Remove the 2 screws that secure the motor mounting plate to the motor support channel.

8. Remove the 3 screws from the end of the motor sup- port channel that interfere with the motor slide path.

9. Slide out the motor and motor mounting plate.

10. Disconnect wiring connections and remove the 4 mounting bolts.

11. Remove the motor.

12. To install the new motor, reverse Steps 1-11.

Fig. 30 — Evaporator-Fan Pulley Alignment

and Adjustment

Fig. 31 — 551A155 Evaporator-Fan

Motor Section

NOTE: A 31/2-in. bolt and threaded plate are included in the installer’s packet. They should be added to the motor support channel below the motor mounting plate to aid in raising the motor. The plate part number is 50DP503842. The adjustment bolt is 3/8- 16 x 21/2 LG.

Fig. 32 — 551A180,240 Evaporator-Fan

Motor Section

V. BELT TENSION ADJUSTMENT

To adjust belt tension:

1.Loosen fan motor bolts.

2.Adjust belt tension:

a.Size 155 Units: Move motor mounting plate up or down for proper belt tension (1/2 in. deflection with one finger).

b.Size 180, 240 Units: Turn motor jacking bolt to move motor mounting plate up or down for proper belt tension (3/8 in. deflection at midspan with one finger [9 lb force]).

3.Tighten nuts.

4.Adjust bolts and nut on mounting plate to secure motor in fixed position.

—27—

Image 27

Bryant operation manual 27, Evaporator-FanPulley Alignment, and Adjustment, 551A155 Evaporator-Fan Motor Section

Contents

X. Step 10 — Install Humidistat for Optional CONTENTS— Install Outdoor-AirHood — Install All AccessoriesFig. 1 — Roof Curb Details Fig. 3 — Rigging Details Adapter Roof CurbFig. 4 — Base Unit Dimensions, 551A155 and Fig. 5 — Base Unit Dimensions, 551A240 Table 1 — Physical Data Fig. 6 — Air Distribution — Thru-the-Bottom III. STEP 3 — FIELD FABRICATE DUCTWORKIV. STEP 4 — MAKE UNIT DUCT CONNECTIONS V. STEP 5 — TRAP CONDENSATE DRAINFig. 10 — Condensate Drain Piping Details B. Field Control WiringFig. 11 — Field Power Wiring Connections Fig. 12 — Field Control Thermostat WiringTable 2 — Electrical Data Table 3 — Electric Resistance Heater Data —10——11— Fig. 13 — Optional Non-FusedDisconnect WiringVII. STEP 7 — MAKE OUTDOOR-AIRINLET ADJUSTMENTS Fig. 15 — EconoMi$er Damper Assembly — End ViewA.Outdoor Air Enthalpy Sensor Installation Table 4 — Heat Anticipator SettingsAdjustment Potentiometers VIII. STEP 8 — INSTALL OUTDOOR-AIRHOODAir Hood Cross-SectionalView E. CO2 Control Setup—13— Fig. 19 — Seal Strip LocationFig. 23 — Typical EconoMi$er Wiring G. Dry Bulb Changeover Set UpTable 5 — EconoMi$er Switchover Control Strategy Table 7 — Default Potentiometer Settings—15— H. Ventilation Air Minimum Position Set UpIX. STEP 9 — INSTALL ALL ACCESSORIES Fig. 24 — Typical EconoMi$er Sensor WiringFig. 25 — Wind Baffle Details —16—Fig. 26 — Motormaster I and Motormaster Humidistat Wiring Schematic 460V Unit Shown—17— Package Control Box—18— III. REFRIGERANT SERVICE PORTSV. INTERNAL WIRING XI. ACCESSORY ECONOMI$ER ADJUSTMENTD. Freeze Protection Thermostats —19——20— —21— —22— Table 11 — Fan Performance — 551A180—23— Table 12 — Fan Performance — 551A240Table 13 — Accessory/FIOP Static Pressure in. wg Fig. 29 — Perfect Humidity Operation Diagram—24— Table 14 — Perfect Humidity Dehumidification Table 15 — Fan RPM at Motor Pulley SettingsTable 16 — Evaporator Fan Motor Specifications —25—IV. EVAPORATOR FAN SERVICE AND REPLACEMENT SERVICEI. CLEANING III.EVAPORATOR FAN PERFORMANCE ADJUSTMENT Fig.Fig. 30 — Evaporator-FanPulley Alignment and AdjustmentMotor Section V. BELT TENSION ADJUSTMENT —27—VII. ECONOMI$ER ADJUSTMENT A. LED Indication VI. CONDENSER-FANADJUSTMENTFig. 33 — Condenser-FanAdjustment 551A155,180 Fig. 34 — Condenser-FanAdjustment 551A240D. High- and Low-PressureSwitches VIII. POWER FAILUREC. To Use The Cooling Charging Chart Fig. 35 — Cooling Charging ChartE. Freeze Protection Thermostat FPT XIV. REPLACEMENT PARTSXVI. OPTIONAL HINGED ACCESS DOORS —30——31— —32— TROUBLESHOOTING Table 18 — Cooling Service Analysis—33— Table 19 — EconoMi$er Troubleshooting Page ELECTRICAL TEMPERATURESI. PRE-START-UP II. START-UP