Terminal Descriptions; Heating Cooling Version - EngA ENGINEERED AIR base Technical Manual

base

TERMINAL DESCRIPTIONS

HEATING COOLING VERSION

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