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

∃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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Bard P1224A1 Troubleshooting ECM Blower Motors, ∃ Run Mositure Check, Evidence of Moisture

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