Crown CSHB60-90XE Operation Manual page 12

All installations and services must be performed by qualified service personnel.
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.
DOES BLOWER SPIN FREELY?
IS THERE 115V
SUPPLIED TO MOTOR?
DISCONNECT 16 PIN
HARNESS FROM
MOTOR. IS THERE 12VDC
ACROSS PIN12 & PIN1
AND PIN12 & PIN3
AT THE HARNESS PLUG?
TURN THERMOSTAT MANUAL FAN
SWITCH ON (IF AVAILABLE) OR JUMPER
BETWEEN R & G ON INTEGRATED CONTROL.
IS THERE VOLTAGE GREATER THAN
12VDC BETWEEN PIN15 & PIN1?
CHECK CONNECTION ON HARNESS AND MOTOR,
RECONNECT HARNESS TO MOTOR, IF
CONNECTIONS ARE GOOD AND MOTOR STILL
DOES NOT RUN REPLACE MOTOR.
NO
YES
NO
YES
NO
DISCONNECT 16PIN
HARNESS FROM
INTEGRATED CONTROL.
IS THERE 12VDC ACROSS
PIN 6 & PIN 1
YES
AT THE CONROL?
CHECK HARNESS
CONNECTIONS
YES
CONFIRM IF EITHER BLOWER
WHEEL IS RUBBING AGAINST
HOUSING OR MOTOR SHAFT
IS SPINNING FREELY, REPAIR
OR REPLACE AS NECESSARY.
CHECK 115V SUPPLY,
CONNECTION FUSES,
SERVICE SWITCH AND
IS THERE 24VAC
ACROSS R &
NO
B/C ON THE
INTEGRATED
CONTROL?
YES
NO
YES
AND WIRE.
CHECK CONNECTIONS AND WIRES
NO
AT INTEGRATED CONTROL, IF OK
REPLACE INTEGRATED CONTROL.
10
DOOR SWITCH.
CHECK 24VAC
TO INTEGRATED CONTROL. SUPPLY
REPLACE
INTEGRATED
CONTROL.