Bard P1124A3 Troubleshooting ECM Blower Motors, ∃ Run Mositure Check, Evidence of Moisture

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TROUBLESHOOTING ECM BLOWER MOTORS

CAUTION

Disconnect power from unit before removing or replacing connectors, or servicing motor. Wait at least 5 minutes after disconnection power before opening motor.

SYMPTOM

Motor rocks slightly when starting.

Motor won't start

∃No movement

∃Motor rocks, but wo'nt start

Motor oscillates up and down while being tested off of blower

∃Noisy blower of cabinet

∃"Hunts" or "puffs" at high CFM (speed)

CAUSE / PROCEDURE

∃This is normal start-up for ICM

∃Check power at motor

∃Check low voltage (24 VAC R to C) at motor

∃Check low voltage connections (G, Y, W, R, C) at motor

∃Check for unseated pins in connectors on motor harness

∃Test with a temporary jumper between R - G

∃Check motor for tight shaft

∃Run Mositure Check

∃Check for loose or compliant motor mount

∃Make sure blower wheel is tight on shaft

∃It is normal for motor to oscillate with no load on shaft.

∃Check for loose blower housing, panels, etc.

∃High static creating high blower speed?

–Check for air whistling through seams in ducts, cabinets or panels.

–Check for cabinet / duct deformation

∃Does removing panel or filter reduce "puffing"?

–Reduce restiction

–Reduce maximum airflow

Evidence of Moisture

∃Motor failure of malfunction has occured and moisture is present

∃Evidence of moisture present inside air mover

DO

∃Check out motor, controls, wiring and connections thoroughly before replacing motor

∃Orient connectors down so water ca'nt get in; install "drip loops"

∃Use authorized motor and control model numbers for replacement

∃Keep static pressure to a minimum:

–Recommend high efficiency, low static filters

–Recommend keeping filters clean

–Design duct work for minimum static, maximum comfort

–Look for and recommend duct work improvement,where necessary, in replacement.

∃Replace motor and perform Moisture Check

∃Perform Moisture Check

DON'T

∃Automatically assume the motor is bad

∃Locate connectors above 7 and 4 o'closk postions

∃Replace one motor of control model number with another (unless an authorized replacement)

∃Use high pressure drop filters. Some have 1/2" H2O drop!

∃Use restricted returns

Manual 2100-353 Page 23

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Contents Installation Instructions Single Package AIR Conditioners Contents For More INFORMATION, Contact These Publishers Getting Other Information and PublicationsGeneral Instructions Field Installed Heater Packages OptionalShipping Damage GeneralHz Circuit a Electrical SpecificationsCompressor Circuit a Fan Motor and Condenser414 Fan Motor and Condenser This column Heater Package Volts Model PhaseIs left blank IntentionallyHtr. KW Circuit B Capacity @ 240 Volts @ 208 Volts Optional Field Installed Electric Heater TableHtr. Amps Fuses Circuits Ampacity Protection SizeDimensions of Units Typical Installations InstallationLocation Slab Mounting AT Ground Level Airflow and Service Access ClearancesElevated Mounting Platforms Roof TOP ApplicationMIS-1177C Unit Model Roof Hood Dimension Dimension for X in FIGRoof Curb Details Field Fabricated CurbingAIR Filters Condensate Drain TrapFilter Requirements & Sizes Condensate Drain TrapWiring 24V LOW Voltage Control Circuit Wiring Main PowerTransformer Taps ThermostatsLOW Voltage Wiring Start UP and Operation LOW Pressure SWITCH, BYPASS, and Lockout Sequence AdjustmentsAlarm Output Adjustable DELAY-ON-MAKE and DELAY-ON-BREAK TimerService Hints Service and TroubleshootingPressure Service Ports FAN Blade SettingsSuction and Discharge Tube Brazing Brazing DiagramIndoor Blower Perfomance ESP P1124A3 P1130A2 P1136A2 P1142A3 P1148A2 P1060A1Return Air Pressure 100 105 110 115 Model Pressure TablePressure Table Motor rocks slightly when starting Motor wont start Troubleshooting ECM Blower Motors∃ Run Mositure Check Evidence of MoistureExcessive noise Motor starts but runs erratically∃ Perform Moisture Check Page Page Page Page Page Page Page

P1124A3, P1224A2 specifications

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