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LEGEND FOR TYPICAL WIRING SCHEMATIC
NOTES FOR TYPICAL WIRING SCHEMATIC
1. If any of the original wire furnished must be replaced, it must be replaced with
Type 90 C wire or its equivalent.
2. Three-phase motors are protected under primary single-phasing conditions.
3. Thermostat:
HH07AT170, 172, 174, and P272-2783.
Subbase:
HH93AZ176, 178, and P272-1882, 1883.
4. Set heat anticipator for first stage at .14 amp, second stage at 0.20 amp, except
for 008 and 009 low heat. Set both first and second stage at 0.14 amp.
5. Use copper conductors only.
IMPORTANT: Refer to unit wiring label for actual unit wiring.
AHA
— Adjustable Heat Anticipator
C
— Contactor, Compressor
CAP
— Capacitor
CB
— Circuit Breaker
CC
— Cooling Compensator
CLO
— Compressor Lockout
COMP
— Compressor Motor
CONN
— Connection
D
— Diode
EC
— Enthalpy Control
ECON
— Economizer
EPS
— Emergency Power Supply (9-Volt Battery)
EQUIP GND — Equipment Ground
ER
— Economizer Relay
FPT
— Freeze-Protection Thermostat
FS
— Flame Sensor
FSS
— Filter-Status Switch
FU
— Fuse
GV
— Gas Valve
GVR
— Gas Valve Relay
HPS
— High-Pressure Switch
HS
— Hall-Effect Sensor
HV
— High Voltage
I
— Ignitor
IDM
— Induced-Draft Motor
IFC
— Indoor (Evaporator) Fan Contactor
IFM
— Indoor (Evaporator) Fan Motor
IGC
— Integrated Gas Unit Controller
LPS
— Low-Pressure/Loss-of-Charge Switch
LS
— Limit Switch
MGV
— Main Gas Valve
MTR
— Motor
NC
— Normally Closed
NO
— Normally Open
OAT
— Outdoor-Air Thermostat
OFC
— Outdoor (Condenser) Fan Contactor
OFM
— Outdoor (Condenser) Fan Motor
P
— Plug
PL
— Plug Assembly
QT
— Quadruple Terminal
R
— Relay
RS
— Rollout Switch
SAT
— Supply-Air Thermostat
SEN
— Sensor
SW1
— Switch Fully Open
SW2
— Switch Fully Closed
SW3
— Switch Minimum Vent Position
SW4
— Switch Maximum Vent Position
TC
— Thermostat-Cooling
TH
— Thermostat-Heating
TRAN — Transformer
Field Splice
Terminal (Marked)
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.