EngA ENGINEERED AIR base - Terminal Descriptions; Heating Cooling Version

base A
10
IOM74 November 2020 R105
TERMINAL DESCRIPTIONS
HEATING COOLING VERSION
Terminal changes when using SH(X) humidifier version are indicated.
Terminal
Type
Name
Description
Value
H N
Power Supply
24 Vac
GND
Ground
Connect to chassis.
LmA
B
Modbus
Internal
n
etwork
.
ECO
AO
ECM Motor Output
ECM motor output controls signal
.
0
-
10 Vdc
PWM
ECM Motor Feedback
ECM motor speed feedback signal
.
PWM
ECM
ECM Common
ECM output signal common
.
0
-
10 Vdc
MHW
AO
Modulating heating
Hot water coil valve actuator.
0V=off.
0
-
10 Vdc
MCW
AO
Modulating cooling
Chilled water coil valve actuator. 0V=off.
0
-
10 Vdc
MEc
AO
Modulating economizer
Economizer / Mixbox actuator. 0V=closed.
0
-
10 Vdc
MSp
AO
VFD command
speed
VFD control signal.
0
-
10 Vdc
MPP
AO
Profile pressure
Modulating profile pressure damper actuator
output.
0-10 Vdc
AL
DO
Alarm
Alarm contact for annunciation.
24 Vac
SA
DO
Supply air
Blower enable contact.
24 Vac
DM
DO
Damper actuator enable
Two position actuator control.
24 Vac
CMa COM
Common to output set
‘a’
Common power relays ‘a’, above. 24/120 Vac
CMb COM
Common to output set
‘b’
Common power relays ‘b’, below. 24/120 Vac
STG1 DO Cooling stage #1
Output
stage #1 cooling, powered from
common ‘b’.
24/120 Vac
STG2 DO Cooling stage #2
Output stage
#2 cooling, powered from
common ‘b’.
24/120 Vac
STG3 DO Cooling stage #3
Output stage
#3 cooling, powered from
common ‘b’.
24/120 Vac
STG4 DO Cooling stage #4
Output stage
#4 cooling, powered from
common ‘b’.
24/120 Vac
STG5 DO Cooling stage #5
Output stage
#5 cooling, powered from
common ‘b’.
24/120 Vac
HiS
DO
High Speed
High speed fan start contact
.
24/120 Vac
Exl
DO
Exhaust fan low
Single or low
speed exhaust fan start
contact.
24/120 Vac
CMc COM
Common to output set
‘c’
Common power relays ‘c’, below. 24/120 Vac
MBV
AO
Modulating ball valve
Modulating gas valve actuator output.
0
-
10 Vdc
MCA AO
Modulating combustion
air
Modulating combustion air actuator output. 0-10 Vdc
FbG AI Feedback Gas
Compares the ball valve actuator feedback
signal to the demand signal.
0-10 Vdc