EngA ENGINEERED AIR base - CD-XM; Basic Operation

base A
30
IOM74 November 2020 R105
CD-XM
TRIAC combustion motor speed drive. The 120V and CB terminals are 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) away from the ignition control.
The CD-XM has (2) lights. The Green light is indication of power, and the blinking yellow light is to show
communication to the base is connected.
BASIC OPERATION
The Chopper Drive module will control the combustion motor speed on DJ and SH indirect fired appliances. 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
Tachometer +
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