Troubleshooting ECM Blower Motors, Symptom

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)

Evidence of Moisture

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

% Motor failure of malfunction has occured and		%	Replace motor and perform Moisture Check
%	moisture is present	%	Perform Moisture Check
%	Evidence of moisture present inside air mover	%	Perform Moisture Check
DO		DON'T
%	Check out motor, controls, wiring and connections	%	Automatically assume the motor is bad
	thoroughly before replacing motor
%	Orient connectors down so water ca'nt get in;	% Locate connectors above 7 and 4 o'closk postions

install "drip loops"

%Use authorized motor and control model numbers % Replace one motor of control model number with another

for replacement		(unless an authorized replacement)
% Keep static pressure to a minimum:	%	Use high pressure drop filters. Some have 1/2" H O drop!
		2
– Recommend high efficiency, low static filters	%	Use restricted returns

–Recommend keeping filters clean

–Design duct work for minimum static, maximum comfort

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

Manual 2100-416

Page 22

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