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TYPICAL WIRING SCHEMATIC (579F240-300, 460-v shown) (cont)
LEGEND FOR TYPICAL WIRING SCHEMATICS
AHA — Adjustable Heat Anticipator
BKR W/AT — Breaks with Amp Turns
BR — Burner Relay
C—Contactor, Compressor
CAP — Capacitor
CB — Circuit Breaker
CC — Cooling Compensator
CH — Crankcase Heater
CLO — Compressor Lockout
COMP — Compressor Motor
CR — Control Relay
CT — Current Transformer
DM — Damper Motor
DU — Dummy Terminal
EC — Enthalpy Control
ER — Economizer Relay
EQUIP — Equipment
EPS — Emergency Power Supply
(9 v Battery)
FPT — Freeze Protection Thermostat
FU — Fuse
GND — Ground
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
IFCB — Indoor (Evaporator)
Fan Circuit Breaker
IFM — Indoor (Evaporator)
Fan Motor
IGC — Integrated Gas Unit Controller
IP — Internal Protector
L—Light
LLSV — Liquid Line Solenoid Valve
LOR — Lockout Relay
LPS — Low-Pressure Switch
LS — Limit Switch
MAT — Mixed-Air Thermostat
MGV — Main Gas Valve
MTR — Motor
OAT — Outdoor-Air Thermostat
OFC — Outdoor (Condenser)
Fan Contactor
OFM — Outdoor (Condenser)
Fan Motor
PL — Plug Assembly
PRI — Primary
QT — Quadruple Terminal
R—Relay
RS — Rollout Switch
SR — Solenoid Relay
SEN,SN — Sensor
SW — Switch
TB — Terminal Block
TC — Thermostat Cooling
TDR — Time-Delay Relay
TH — Thermostat Heating
TRAN — Transformer
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Factory Wiring
Field Wiring
To Indicate Common
Potential Only, Not
To Represent Wiring
NOTES FOR 579F240-300 UNITS:
1. Compressor and fan motors thermally protected; 3-phase motors
protected against primary single-phasing conditions.
2. If any of the original wire furnished must be replaced, it must be
replaced with type 90 C wire or its equivalent.
3. Jumpers are omitted when unit is equipped with economizer.
4. IFCB must trip amps is equal to or less than 140% full load amps,
and CB1 and CB2 (156%).
5. On TRAN1 use BLK lead for 460-v power supply.
6. The CLO locks out the compressor to prevent short cycling on
compressor overload and safety devices. Before replacing CLO,
check these devices.
7. Number(s) indicates the line location of used contacts. A bracket
over (2) numbers signifies a single-pole, double-throw contact.
An underlined number signifies a normally closed contact. Aplain
(no line) number signifies a normally open contact.
8. TDR switches 1 and 2 to be set to ON for a 3-second delay.
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