LEGEND FOR FIG. 47 — TYPICAL WIRING SCHEMATIC AND COMPONENT ARRANGEMENT
IMPORTANT: Refer to unit wiring label for actual unit wiring
information.
AHA — Adjustable Heat Anticipator
C—Contactor, Compressor
CAP — Capacitor
CC — Cooling Compensator
CH — Crankcase Heater
COMP — Compressor Motor
D—Diode
EC — Enthalpy Control
ECON — Economizer
EPS — Emergency Power Supply
(Nine Volt Battery)
EQUIP — Equipment
ER — Economizer Relay
FPT — Freeze Up Protection Thermostat
GND — Ground
HPS — High-Pressure Switch
HS — Hall-Effect Sensor
I—Ignitor
IDM — Induced-Draft Motor
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
OAT — Outdoor-Air Thermostat
OFM — Outdoor (Condenser) Fan Motor
P—Plug
PL — Plug Assembly
QT — Quadruple Terminal
R—Relay
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.
RS — Rollout Switch
SAT — Supply Air Thermostat
SEN — Sensor
SW1 — Switch Fully Open
SW2 — Switch Fully Closed
SW3 — Switch Min. Vent Position
SW4 — Switch Max. Vent Position
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.
4. Set heat anticipator at .14 amp. For units with 2 stages of heating,
set stage two anticipator at .14 amp.
5. Use copper conductors only.
6. TRAN is wired for 230-v unit. If unit is to be run with 208-v power
supply, disconnect BLK wire from 230-v tap (ORN) and connect to
208-v tap (RED). Insulate end of 230-v tap.
39
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