CenCon
49
CD-XM
TRIAC combustion motor speed drive. The 120V and CB terminals as separated to accept heavy insulation wire
from the combustion blower motor. The CD-XM will be mounted in the electrical panel on ‘standard’
equipment. The CD-XM must always be mounted such that the speed sensor wire does not need to be
extended, therefore it may be mounted inside the burner cabinet in equipment that has the burner control
panel mounted farther away. If so, keep at least 6” (150mm) aware from the ignition control.
BASIC OPERATION
The Chopper Drive module will control the combustion motor speed on DJ indirect fired burners in conjunction
with the J-XM heating module. A 3 wire feedback signal from the Engineered Air DJ hall-effect speed sensor is
used to prove the actual blower speed.
Terminal Type
Name
Description
Value
H N
Power Supply
24Vac Grounded Neutral
24 Vac
GND
Ground
Connect to chassis.
LmA B
Modbus
Internal Network
OS
AI
Tach
Engineered Air DJ speed sensor Red wire.
0-10 Vdc
YS
AI
Tachometer -
Engineered Air DJ speed sensor Yellow wire.
0-10 Vdc
GS
AI
Tachometer
reference
Engineered Air DJ speed sensor Green wire.
0-10 Vdc
CB
AO
TRIAC output
Output to combustion blower motor.
120 Vac
120
120V line in
120V Hot input
120 Vac
SR1,2
DO
Safety relay
Normally open output contacts
24/120 Vac
