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Bryant 548D Typical Belt-DriveMotor, Mounting for Size, Indoor-FanPulley Adjustment

Models: 548D

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Fig. 37 — Typical Belt-Drive Motor

5.Set movable flange at nearest keyway of pulley hub and tighten setscrew. (See Table 1 for speed change for each full turn of pulley flange).

To align fan and motor pulleys:

1.Loosen fan pulley setscrews.

2.Slide fan pulley along fan shaft.

3.Make angular alignment by loosening motor from mounting plate.

To adjust belt tension:

1.Loosen fan motor mounting plate nuts.

2.Units 090,102 — Slide motor mounting plate away from fan scroll for proper belt tension (1/2-in. deflection with 5 to 10 lbs of force) and tighten mounting nuts with 10 lbs torque (see Fig. 36).

Unit 120 — Slide motor mounting plate downward to tighten belt tension (1/2-in. deflection with 5 to 10 lbs of force). Secure motor mounting plate nuts with 10 lbs of torque. See Fig. 37.

3.Adjust bolt and nut on mounting plate to secure motor in fixed position.

Realign fan and motor pulleys:

1.Loosen fan pulley setscrews.

2.Slide fan pulley along fan shaft.

3.Make angular alignment by loosening motor from mounting plate.

Fig. 37 — Typical Belt-Drive Motor

Mounting for Size 120

MOTOR MOUNTING

PLATE NUTS

Fig. 38 — Indoor-Fan Pulley Adjustment

Fig. 36 — Typical Belt-Drive Motor Mounting for Sizes 090 and 102

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Bryant 548D installation instructions Typical Belt-DriveMotor, Mounting for Size, Indoor-FanPulley Adjustment

Contents

CONTENTS III. Step 3 - Install Condensate Drain LineSAFETY CONSIDERATIONS INSTALLATIONFig. 1 - Roof Curb Details Fig. 3 - Condensate Drain Connection Fig. 2 - Unit Leveling TolerancesII. STEP 2 - FIELD FABRICATE DUCTWORK IV. STEP 4 - RIG AND PLACE UNITFig. 5 - Rigging Details Fig. 6 - Base Unit Dimensions Table 1 - Physical Data V. STEP 5 - MAKE ELECTRICAL CONNECTIONS A. Field Power SupplyFig. 7 - Power Wiring Connections Page Page LEGEND AND NOTES FOR TABLES 2A AND 2B B. Field Control Wiring D. Heat Anticipator SettingsVI. STEP 6 - ADJUST FACTORY-INSTALLEDOPTIONS A. Disconnect SwitchFig. 11 - Panel Locations Table 3 - Heat Anticipator SettingsFig. 10 — Defrost Board Fig. 14 - Durablade Economizer Installation Economizer InstallationFig. 12 - Outdoor-AirHood Details Fig. 15 - Horizontal Discharge DurabladeMinimum Position Setting Position Damper SettingFig. 17 - Durablade Economizer Damper Fig. 18 - Durablade Economizer MinimumDamper Characteristics C. Optional EconoMi$er Fig. 23 - Typical Access Panel LocationsFig. 21 - Durablade Economizer Barometric Relief Fig. 22 - EconoMi$er Component LocationsFig. 28 - Rear EconoMi$er Flange Installation Fig. 24 - Exhaust Air Hood AssemblyFig. 29 - EconoMi$er Installed Fig. 25 - Outdoor Air Hood AssemblyFig. 30 - EconoMi$er Wiring Fig. 31 - EconoMi$er Sensor WiringFig. 32 - Wiring Diagram for Power Exhaust System Fig. 33 - Supply Air Sensor Mounting LocationTable 5 - Default Potentiometer Settings Fig. 34 - EconoMi$er Control AdjustmentPotentiometers Factory Settings VII. STEP 7 - ADJUST INDOOR-FANSPEEDMounting for Size Fig. 38 - Indoor-FanPulley AdjustmentFig. 37 - Typical Belt-DriveMotor Table 7 - Fan Rpm at Motor Pulley Settings Table 6 - indoor-FanMotor PerformancePage Page Page Page Page Page V. INTERNAL WIRING VI. REFRIGERANT SERVICE PORTSPRE-START-UP START-UP I. UNIT PREPARATIONIX. ADJUST GAS INPUT XII. SAFETY RELIEFX. COOLING To Shut Off UnitSERVICE I. CLEANINGD. Cooling, Units With EconoMi$er F. DefrostFig. 39 - Cleaning Outdoor Coil B. Outdoor CoilsC.Condensate Drain D. FiltersIII.OUTDOOR FAN ADJUSTMENT Fig Fig. 42 - Outdoor Fan AdjustmentIV. ECONOMIZER ADJUSTMENT A. Checking and Adjustment Refrigerant ChargeFig. 44 - Cooling Charging Chart 548D102 Fig. 45 — Cooling Charging Chart; 548D120TROUBLESHOOTING Table 14 - Heating and Cooling TroubleshootingTable 15 - Durablade Economizer Troubleshooting Table 16 - EconoMi$er Troubleshooting Fig. 46 - Typical Wiring Diagram Fig. 46 - Typical Wiring Diagram cont Page START-UPCHECKLIST Remove and Store in Job File TEMPERATURESI. PRELIMINARY INFORMATION III.START-UP