T R O U B L E S H O O T I N G T R E E S
MN-36008 (Rev. 8) 01/16 • COMBITHERM CT EXPRESS • D-16
Two Speed Motor - No High Speed Motor Operation
(without motor protection switch)
is there L1 power supplied
to terminal 21 of K-52
contactor?
Is there L1 power at terminal
22 of K-52 contactor?
Yes
No
L1 supplied to terminal 21
from RBH/X3/300
Yes
Is K-52 coil energized
and engaged?
Repair wiring between K-52 and
motor blue wire
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
L1/14 from TB 16, L2/13 from N7
high limit through motor high limit
L2/12 from TB 14/2
Replace motor relay
Repair wiring between motor
relay and motor
Ohm out motor and replace if
necessary
Is there L1 power at the blue
wire of the motor?
Is motor relay coil
energized?
Is L2 power at terminal 12
of motor relay?
Is L2 power at terminal 8 of
motor relay?
Is there voltage across blue/
white wires at motor?
Is motor running?
High speed motor operation
is working
Replace faulty K-52
contactor
No
Yes
Unit is in low speed
operation
Summary of Contents for CT EXPRESS 4 10ESi
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