EngA ENGINEERED AIR base Technical Manual page 11

base
FbA AI Feedback Air
CP AI Condensate probe
PV1, PV2 DO Pilot valve
SR1, SR2 DO Safety relay
FR1, FR2 DO Flame relay
EnH DI Enable heat
FbV DI Feedback valve
VN Valve neutral
HL DI High limit
BFS DI Blocked flue switch
CAS DI Combustion air switch
Common to output set
CMd COM
'd'
SDO DO Multipurpose output.
WPu DO Water Pump
FbD AI Damper Feedback
ASP AI Remote VFD Setpoint
RPM AI VFD feedback speed
Modulating heating
thermostat or control for
W+- AI
humidification on SH
version
AA1,2 AI Ambient air temperature
DA1,2 AI Discharge temperature
Modulating cooling
Y+- AI
thermostat
HiE DI High Speed Enable
EnC DI Enable cooling
OCC DI Occupied / Unoccupied
ENF DI Enable Fan
DES DI Damper End Switch
FbB DI Air Proving Switch
BYP DI VFD Bypass
MX1, MX2 AO Maxitrol Valve
IOM74
Compares the combustion air actuator
feedback signal to the demand signal.
Condensate probe sensor input.
Disables the pilot flame once the main
burner has been established.
Secondary safety lockout contacts
Flame relay enable contacts.
24V must be applied to allow heating
function.
Feedback signal from the safety shut off
valve (SSOV). Wired directly to valve.
Neutral feedback signal from the safety shut
off valve (SSOV) and High Limit.
Normally closed, opens on high temperature.
Normally closed, opens on blocked flue.
Optional proof of combustion air flow.
Common power relays 'd', above.
HE dual flame sensing switchover and
Combustion blower start output for DG.
Enable evaporative 'swamp' cooler water
pump.
Modulating damper actuator feedback.
VFD speed input demand signal.
VFD output speed feedback
Independent heating demand or SH humidity
signal.
10k Type 2 thermistor
10k Type 2 thermistor
Independent cooling demand signal.
Initiate high speed operation.
Enable / disable mechanical cooling.
Enable occupied mode when powered.
Occupied mode start
Mechanical damper end switch input
Supply blower air proving switch
VFD bypass input.
DC current output to the Maxitrol modulating
valve.
11
A
0-10 Vdc
Ohms (Ω)
24/120 Vac
24/120 Vac
24/120 Vac
24 Vac
24/120 Vac
24 Vac
24 Vac
24 Vac
24/120 Vac
24/120 Vac
0-10 Vdc
0-10 Vdc
0-10 Vdc
0-10 Vdc
Ohms (Ω)
Ohms (Ω)
0-10 Vdc
24 Vac
24 Vac
24 Vac
24 Vac
24 Vac
24 Vac
24 Vac
mAdc
November 2020 R105