Lennox Prodigy M2 Application Manual page 104

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A55
M2 board. Main RTU control board
A133
GP1 Board. General purpose add−on board DIP selects
3 functions
A169
MCB1 board. A Box motor control board.
AI
Analog input
AO
Analog output
BL
Blower
C2
2nd compressor add−on board (A59)
C1
1st stage cooling
C2
2nd stage cooling
C3
3rd stage cooling
C4
4th stage cooling
CAI
Combustion air inducer
CAVB
Constant air volume with bypass damper
COM
Electrical common
CL
Cooling
CP1
Compressor 1
CP2
Compressor 2
CP3
Compressor 3
CP4
Compressor 4
CSP
Cooling setpoint
DAC
Discharge (supply) air control
DACC
Discharge (supply) air control cooling
DACH
Discharge (supply) air control heating
DAP
Discharge (supply) air pressure
DAT
Discharge (supply) air temperature
DB
Deadband
DCV
Demand controlled ventilation
DI
Digital input
Diff
Differential
DIP
DIP switch
DO
Digital output
ECTO
Electronic configure to order (control parameters)
FAC
Fresh air cooling control
FAH
Fresh air heating control
FAT
Fresh air tempering control. See FAC & FAH
FC
Free cooling
G
Thermostat demand, blower
GLO
Global mode or input (economizer)
GP1
General purpose board GP1−1 (A133)
H1
1st stage heating
H2
2nd stage heating
H3
3rd stage heating
H4
4th stage heating
HP
High pressure
HSP
Heating setpoint
HT
Heating
IAQ
Indoor air quality. Often synonymous with CO
ppm
Abbreviations
IDE
Indoor enthalpy. Depends on temperature and humidity
w.c.
Inches of water column
LED
Light emitting diode. An indicator light, found either as in-
dividual elements or grouped together as segments to
form characters
LP
Low pressure
LT
Limit
M2
M2 Unit Controller − main controller board (A55). Firm-
ware version 7.00.00 or later.
MCB1
A Box motor control board (A169).
MGV
Modulating gas valve
MSAV
Multi Stage Air Volume
OAC
Outdoor air control
OAS
Outdoor air suitable for free cooling
OAT
Outdoor air temperature
OCP
Thermostat demand, occupied mode
ODE
Outdoor enthalpy. Depends on temperature and humid-
ity
PID
Proportional, integral and derivative based control loop
PPM
Parts per million (mostly used for CO
RAP
Return air pressure
RAT
Return air temperature
RH
Relative humidity
RS
Reset
RTU
Roof top unit
RT6
Discharge air temperature sensor
RT16
Return air temperature sensor
RT17
Outdoor air temperature sensor
SMK
Smoke detection mode (alarm)
SP
Setpoint
Stg
Stage
TB
Terminal block
UnOCP Unoccupied
W1
Thermostat demand, heat stage 1
W2
Thermostat demand, heat stage 2
W3
Thermostat demand, heat stage 3
W4
Thermostat demand, heat stage 4
VAC
Alternating current voltage
VAV
Variable air volume. Accomplished with a variable fre-
quency drive (VFD)
VDC
Direct current voltage
VFD
Var. frequency drive. An AC inverter used to vary motor
speed
VT
Ventilation
Y1
Thermostat demand, cooling stage one
Y2
Thermostat demand, cooling stage two
Y3
Thermostat demand, cooling stage three
Y4
Thermostat demand, cooling stage four
level in
2
ZAT
Zone air temperature
Page 104
measurements)
2

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