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All installations and services must be performed by qualified service personnel.
13
CONFIRM IF EITHER BLOWER
WHEEL IS RUBBING AGAINST
HOUSING OR MOTOR SHAFT
IS SPINNING FREELY, REPAIR
OR REPLACE AS NECESSARY.
DOES BLOWER SPIN FREELY?
IS THERE 115V
SUPPLIED TO MOTOR?
CHECK 115V SUPPLY,
CONNECTION FUSES,
SERVICE SWITCH AND
DOOR SWITCH.
CHECK HARNESS
CONNECTIONS
AND WIRE.
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
THIS GUIDE SHOULD BE USED IN THE CASE OF A STOPPED OR MANFUNCTIONED ECM
BLOWER MOTOR. THE FOLLOWING SHOULD HELP ESTABLISH THE TYPE OF
MALFUNCTION OR DEVIATION FROM THE NORMAL BLOWER OPERATION.
TO USE THIS DIAGRAM, YOU JUST NEED TO FOLLOW THE INSTRUCTIONS IN THE BOXES.
CHECK 24V SUPPLY
TO INTEGRATED CONTROL.
IS THERE 24V
ACROSS R &
B/C ON THE
INTEGRATED
CONTROL?
REPLACE
INTEGRATED
CONTROL.
TURN THERMOSTAT MANUAL FAN
SWITCH ON (IF AVAILABLE) OR JUMPER
BETWEEN R & G ON INTEGRATED CONTROL.
IS THERE VOLTAGE GREATER THAN
12V BETWEEN PIN15 & PIN1?
CHECK CONNECTIONS AND WIRES
AT INTEGRATED CONTROL, IF OK
REPLACE INTEGRATED CONTROL.
DISCONNECT 16 PIN
HARNESS FROM
16x4 BOX. IS THERE 24V
ACROSS PIN12 & PIN1
AND PIN12 & PIN3
AT THE HARNESS PLUG?
CHECK CONNECTION ON HARNESS AND MOTOR,
RECONNECT HARNESS TO MOTOR, IF
CONNECTIONS ARE GOOD AND MOTOR STILL
DOES NOT RUN REPLACE MOTOR.
REPLACE 16x4 BOX
NO
NO
YES
DISCONNECT 16PIN
HARNESS FROM
INTEGRATED CONTROL.
IS THERE 24V ACROSS
PIN12 & PIN1 AND
PIN12 & PIN3
AT THE CONTROL?
DISCONNECT 4 PIN COMMUNICATION
HARNESS FROM MOTOR.
IS THERE 30-35 VDC ACROSS PIN 1 & 4?
ULTRATECH
NOTE: In an emergency, a PSC motor can be installed in place of the ECM motor for a temporary repair only.
The PSC motor will run continuously at one speed only. The PSC motor can be connected directly to the CIRC-H
and the CIRC-N terminals on the W/R integrated control. For more information contact Thermo Products Technical
Service at 1-800-348-5130.