37
LEGEND
AHA — Adjustable Heat Anticipator
AWG — American Wire Gage
C—Contactor, Compressor
CAP — Capacitor
CB — Circuit Breaker
CC — Cooling Compensator
COMP — Compressor Motor
D — Diode
EC — Enthalpy Control
ECON — Economizer
EPS — Emergency Power Supply
EQUIP — Equipment
ER — Economizer Relay
FPT — Freeze-Up Protection Thermostat
FU — Fuse
GND — Ground
HC — Heater Contactor (Strip Heat)
HPS — High-Pressure Switch
IFC — Indoor-Fan Contactor
IFM — Indoor-Fan Motor
IFMOVL — Indoor-Fan Motor Overload
IFR — Indoor-Fan Relay
LPS — Low-Pressure Switch
LSM — Limit Switch (Manual Reset)
MTR — Motor
OAT — Outdoor-Air Thermostat
OFC — Outdoor-Fan Contactor
OFM — Outdoor-Fan Motor
P—Plug
PL — Plug Assembly
QT—Quadruple Terminal
R—Relay
SAT — Supply-Air Thermostat
SEN — Sensor
SW1—Switch Fully Open
SW2 — Switch Fully Closed
SW3 — Switch Min Vent Position
SW4—Switch Max Vent Position
TB — Terminal Block
TC — Thermostat-Cooling
TH — Thermostat-Heating
TRAN — Transformer
Field Splice
Marked Wire
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.
NOTES
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 at 1 amp.
5. Use copper conductors only.
6. Use copper, copper-clad aluminum or aluminum conductors.
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