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Fig. 44 — Typical Wiring Schematic
LEGEND
AHA — Adjustable Heat Anticipator
C—Contactor, Compressor
CAP — Capacitor
CC — Cooling Compensator
COMP — Compressor Motor
D—Diode
EC — Enthalpy Control
ECON — Economizer
EPS — Emergency Power Supply
(Nine Volt Battery)
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
LPS — Low Pressure Switch
LSM — Limit Switch (Manual Reset)
MTR — Motor
OAT — Outdoor Air Thermostat
OFM — Outdoor Fan Motor
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
TDR — Time-Delay Relay
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 phas-
ing conditions.
3. Thermostat:
HH07AT170, 172, 174 & P272-2783
Subbase:
HH93AZ176, 178 & 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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