133 / 156
Electrical Theory & Applications for HVACR
Chapter 6: Troubleshooting
Page 121
VOLTAGE ON LOAD SIDE
(BOTTOM) OF
MOTOR CONTACTOR
VOLTAGE ON LOAD SIDE
(TOP) OF
MOTOR CONTACTOR
NO
NO
YES
YES
MOTOR START
COMPONENTS
CAPACITORS
INTERNAL
OVERLOADS
MOTOR
WINDINGS
ON/OFF
SWITCH
MOTOR
CONTROL CIRCUIT
CHECK FUSES OR CIRCUIT
BREAKERS
HIGH
PRESSURE
SWITCH
LOW
PRESSURE
SWITCH
LIMIT
SWITCH
SOLID
STATE
MODULE
MOTOR TIME
DELAY OR
INTERLOCK
EXTERNAL
OVERLOADS
INTERNAL
OVERLOADS
MOTOR TROUBLESHOOTING FLOW CHART