Specifications

5
LEGEND
AHA —
Adjustable Heat Anticipator
AWG —
American Wire Gage
BR —
Blower Relay
C—
Contactor, Compressor
CAP —
Capacitor
CB —
Circuit Breaker
CC —
Cooling Compensator
CH —
Crankcase Heater
CLO —
Compressor Lockout
CO
2
—
Carbon Dioxide
COC —
Cool Changeover Relay
COH —
Heat Changeover Relay
COM —
Common
COMMS —
Communications
COMP —
Compressor Motor
CR —
Control Relay
CTD —
Compressor Time Delay
D—
Diode
DAT —
Discharge Air Thermistor
DB —
Defrost Board
DFT —
Defrost Thermostat
DM —
Damper Motor
DR —
Defrost Relay
DX —
Direct Expansion
EC —
Enthalpy Control
ECON —
Economizer
EFC —
Exhaust Fan Contactor
EPS —
Emergency Power Supply
EQUIP —
Equipment
ER —
Economizer Relay
FC —
Fan Contactor
FPT —
Freeze Protection Thermostat
FU —
Fuse
GND —
Ground
GVR —
Gas Valve Relay
HC —
Heater Contactor (Electric Heater)
HM —
Humidity Relay
HPS —
High-Pressure Switch
HR —
Heater Relay
HTR —
Heater
HV TRAN —
High-Voltage Transformer
I—
Ignitor
IAQ —
Indoor Air Quality
IFC —
Indoor-Fan Contactor
IFM —
Indoor-Fan Motor
IFMOVL —
Indoor-Fan Motor Overload Switch
IFR —
Indoor-Fan Relay
IGC —
Integrated Gas Controller
LED —
Light Emitting Diode
LPS —
Low-Pressure/Loss-of-Charge Switch
LSM —
Limit Switch (Manual Reset)
LTLO —
Low Temp Cooling Lockout
MCA —
Minimum Circuit Amps
MGV —
Main Gas Valve
MTR —
Motor
NC —
Normally Closed
NEC —
National Electrical Code
NO —
Normally Open
OAT —
Outdoor-Air Thermostat
OATC —
Outdoor Air Thermostat (Cool)
OATH —
Outdoor Air Thermostat (Heat)
OCR —
Occupied Relay
OFC —
Outdoor-Fan Contactor
OFM —
Outdoor-Fan Motor
OLR —
Overload Relay
P, P L —
Plug
QT —
Quadruple Terminal
R—
Relay
RVS —
Reversing Valve Solenoid
SAT —
Supply-Air Thermostat
SW —
Switch
SW1 —
Switch, Fully Open
SW2 —
Switch, Fully Closed
SW3 —
Switch Minimum Vent Position
SW4 —
Switch Maximum Vent Position
TB —
Terminal Block
TC —
Thermostat, Cooling
TDR —
Time-Delay Relay
TH —
Thermostat, Heating
TRAN —
Transformer
VVT® —
Variable Volume/Variable Temperature
Field Splice
Terminal (Marked)
Marked Wire
Terminal (Unmarked)
Terminal Block
Splice
Splice Marked
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To indicate common potential only.
Not to represent wiring.