A
base
IOM67
8
February 2021 R0
CD-XM EXPANSION MODULE
A Triac driver slave connected via Modbus
communication to the
base
, this module controls
the combustion motor speed on DJ indirect fired
heaters. A 3 wire feedback signal is returned to
the module to confirm the blower speed.
PRESSURE PORTS
Marked as H (high side) and L (low side) for use on
direct fired appliances.
Pressure ports may not be included on appliances
that do not require them.
m
CAUTION:
Do not blow onto the pressure ports. Excessive
pressure and moisture will damage it. The ports are
fragile and should not be tampered with.
TERMINAL DESIGNATIONS
Terminals
indicated
change on the humidifier
version.
H N
Power Supply
GND
Ground
LmA,B
Local Modbus
ECO
AI
EC Motor Common
PWM
AI
EC Motor Running Speed
ECM
AO
EC Motor Demand
MHW AO
Modulating Heating
MCW
AO
Modulating Cooling
MEc
AO
Modulating economizer
MPP
AO
Profile Plate Actuator
AL
DO
Alarm
SA
DO
Supply air
DM
DO
Damper actuator enable
CMa
DO
Relay ‘a’ Common
CMb
DO
Relay ‘b’ Common
STG1 DO
Cooling Stage 1
STG2 DO
Cooling Stage 2
STG3 DO
Cooling Stage 3
STG4 DO
Cooling Stage 4
STG5 DO
Cooling Stage 5
HiS
DO
High Speed Exhaust Fan Start
Exl
DO
Low Speed Exhaust Fan Start
CMc
DO
Relay ‘c’ Common
MBV
AO
Modulating Ball Valve
MCA
AO
Modulating Air Actuator
FbG
AI
Modulating Gas Valve Feedback
FbA
AI
Modulating Air Feedback
CP
AI
Condensate Probe
PV1,2 DO
Pilot Valve
SR1,2 DO
Safety Relay
FR1,2 DO
Flame Relay
FbV
DI
Feedback Gas Valve
VN
DI
Feedback Gas Valve Neutral
HL
DI
High Limit
EnH
DI
Enable Heat
BFS
DI
Blocked Flue Switch
CAS
DI
Combustion Air Switch
CMd
DO
Relay ‘d’ Common
SDO
DO
(HE) Dual Flame Rod
SDO
DO
(DG) Combustion Blower Start
WPu
DO
Water Pump
FbD
AI
Feedback Economizer Damper
ASP
AI
Remote VFD setpoint
