LEGEND FOR FIG. 18-30
Fig. 31 — Main Base Board (MBB)
ACCSY — Accessory
ACC’Y — Accessory
AN — Analog
APS — Air Pressure Switch
BR — Blower Relay
C — Compressor Contactor
CB — Compressor Circuit Breaker
CCB — Control Circuit Breaker
CCH — Crankcase Heater
CCN — Carrier Comfort Network
®
CCT — Cooling Coil Thermistor
CEM — Controls Expansion Module
CMR — Compressor Modulation Relay
COMP — Compressor
CR — Control Relay
CSB — Current Sensor Board
CXB — Compressor Expansion Board
DGS — Discharge Gas Sensor
DI — Digital Input
DPT — Discharge Pressure Transducer
D/S — Downshot (Vertical)
DTT — Discharge Temperature Thermistor
DUS — Digital Unloader Solenoid
ECB — Economizer Control Board
ECON — Economizer
EQUIP — Equipment
ERV — Energy Recovery Ventilation
EXB — Economizer Control Board
EXH — Exhaust
EXV — Electronic Expansion Valve
FIOP — Factory-Installed Options
FU —Fuse
GND — Ground
GVR — Gas Valve Relay
HC — Heater Contactor
HIR — Heat Induction Relay
HMV — Humidi-MiZer Valve
HPS — High-Pressure Switch
HS — Hall Effect Sensor
HV — High Voltage
HVS — Humidi-MiZer Valve Solenoid
I — Ignitor
IAQ — Indoor Air Quality
IDM — Induced Draft Motor
IFC — Indoor Fan Contactor
IFCB — Indoor Fan Circuit Breaker
IFM — Indoor Fan Motor
IFO — IGC Fan Output
IGC — Integrated Gas Controller
LEN — Local Equipment Network
LLS — Liquid Line Solenoid
LLT — Liquid Line Transducer
LON — Local Operating Network
LS — Limit Switch
MBB — Main Base Board
MGV — Main Gas Valve
MLV — Minimum Load Valve
MM — Motormaster
®
MMF — MotorMaster V Fuses
MMR — MotorMaster V Relay
MMV — MotorMaster V Control
MP — Modular Motor Protector
MSP — Motor Starter Protector
NEC — National Electrical Code
OA — Outdoor Air
OAQ — Outdoor Air Quality
OAT — Outdoor-Air Thermostat
OD — Outdoor
OFC — Outdoor Fan Contactor
OFM — Outdoor Fan Motor
OL — Overload
OPT —Option
PE — Power Exhaust
PEC — Power Exhaust Contactor
PECB — Power Exhaust Circuit Breaker
PEM — Power Exhaust Motor
PLP — Phase Loss Protection
PMO — Phase Monitor Option
PMR — Phase Monitor Relay
PP — Communications
PS — Pressure Switch
PTC —
Positive Temperature Coefficient
Power Reference
RAT — Return Air Thermistor
RCB — Rooftop Control Board
RET — Return
RF — Return Fan
RS — Rollout Switch
RXB — Rooftop Control Board
SAT — Supply Air Thermistor
SCB — Staged Gas Control Board
SCR — Silicon Controlled Rectifier
SEN — Sensor
SPT — Suction Pressure Transducer
S/S — Side Shot
STDU — Standard Tier Display Unit
TB — Terminal Block
TRAN — Transformer
UPC — Unitary Protocol Converter
VAV — Variable Air Volume
VFD — Variable Frequency Drive
Terminal Block
Terminal (Unmarked)
Terminal (Marked)
Splice
Factory Wiring
Field Wiring
To indicate common potential
only, not to represent wiring.
To indicate factory-installed
option or accessory.
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