EngA ENGINEERED AIR base - Page 11

base A
11
IOM74 November 2020 R105
FbA AI Feedback Air
Compares the combustion air actuator
feedback signal to the demand signal.
0-10 Vdc
CP
AI
Condensate probe
Condensate probe sensor input.
Ohms (Ω)
PV1, PV2 DO Pilot valve
Disables the pilot flame once the main
burner has been established.
24/120 Vac
SR1, SR2
DO
Safety relay
Secondary safety lockout contacts
24/120 Vac
FR1, FR2
DO
Flame relay
Flame relay enable contacts.
24/120 Vac
EnH DI Enable heat
24V must be applied to allow heating
function.
24 Vac
FbV DI Feedback valve
Feedback signal from the safety shut off
valve (SSOV). Wired directly to valve.
24/120 Vac
VN Valve neutral
Neutral feedback signal from the safety shut
off valve (SSOV) and High Limit.
HL
DI
High limit
Normally closed, opens on high temperature.
24 Vac
BFS
DI
Blocked flue switch
Normally closed, opens on blocked flue.
24 Vac
CAS
DI
Combustion air switch
Optional proof of combustion air flow.
24 Vac
CMd COM
Common to output set
‘d’
Common power relays ‘d’, above. 24/120 Vac
SDO DO Multipurpose output.
HE dual flame sensing switchover and
Combustion blower start output for DG.
WPu DO Water Pump
Enable evaporative ‘swamp’ cooler water
pump.
24/120 Vac
FbD
AI
Damper Feedback
Modulating damper actuator feedback.
0
-
10 Vdc
ASP
AI
Remote VFD Setpoint
VFD speed input demand signal.
0
-
10 Vdc
RPM
AI
VFD feedback speed
VFD output
speed feedback
0
-
10
Vdc
W+- AI
Modulating heating
thermostat or control for
humidification on SH
version
Independent heating demand or SH humidity
signal.
0-10 Vdc
A
A1,2
AI
Ambient
air temperature
10k Type 2 thermistor
Ohms (Ω)
DA1,2
AI
Discharge temperature
10k Type 2 thermistor
Ohms (Ω)
Y+- AI
Modulating cooling
thermostat
Independent cooling demand signal. 0-10 Vdc
HiE
DI
High Speed Enable
Initiate high speed operation.
24 Vac
EnC
DI
Enable cooling
Enable / disable
mechanical cooling.
24 Vac
OCC
DI
Occupied / Unoccupied
Enable occupied mode when powered.
24 Vac
EN
F
DI
Enable Fan
Occupied mode start
24 Vac
DES
DI
Damper End Switch
Mechanical damper end switch input
24 Vac
FbB
DI
Air Proving Switch
Supply
blower air proving switch
24 Vac
BYP
DI
VFD Bypass
VFD bypass input.
24 Vac
MX1, MX2 AO Maxitrol Valve
DC current output to the Maxitrol modulating
valve.
mAdc