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3 Wire

Motor-to-Control Harness

3 Pin Connector

Motor

Connector

Beyond basic visual checks and voltage / resistance checks;

the Emerson ECM motor may be tested with an Emerson

UltraCheck-EZ™ diagnostic tool (Part UTT-01). This tool

will test the motor windings and also the communicating

module of the motor.

USING THE EMERSON

ULTRACHECK-EZ™ DIAGNOSTIC TOOL

Fi 4

Orange Power Button

Green LED

Emerson

Ultracheck-EZ™ Diagnostic Tool

• Turn off power to the furnace being serviced and verify

with a volt meter

• Disconnect the 4 wire communication cable from the

motor control unit (end bell)

• Connect the 4 wire connector of the diagnostic tool

to the end bell communicating connector

• Attach one of the alligator clips of the diagnostic tool

to the 24 volt hot terminal of the furnace transformer

and the other alligator clip to the 24 volt common

(ground) terminal. The alligator clips are not polarity

sensitive

• Turn ON furnace power.

SERVICE & OPERATION

• The orange button of the diagnostic tool sends a sig-

nal to the UltraTech

motor to rotate when pressed.

There may be a five second delay between the time

the button is pressed and the motor begins to rotate.

If the orange button does not illuminate when pressed,

the tool is not connected to a 24 volt supply or it is

defective. The GREEN LED is an indicating signal that

communication is taking place. If the green LED does

not blink, the end bell should be replaced.

Daikin DC97MC User Manual

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