Bryant 549C manual Typical Wiring Schematic 542J, EconoMi$erIV Wiring 542J150,180

TYPICAL WIRING SCHEMATIC — 542J (cont)

LEGEND

C— Contactor, Compressor CAP — Capacitor

CB	— Circuit Breaker
CH	— Crankcase Heater
CLO	— Compressor Lockout
COMP	— Compressor Motor
DB	— Defrost Board
DFT	— Defrost Thermostat
FL	— Freeze Protection Limit Switch
FPT	— Freeze Protection Thermostat
FU	— Fuse
GND	— Ground
HC	— Heater Contactor (Electric Heater)
HPS	— High-Pressure Switch
HR	— Heater Relay
HTR	— Heater
IFC	— Indoor-Fan Contactor
IFCB	— Indoor Fan Circuit Breaker
IFM	— Indoor-Fan Motor
IP	— Internal Protection
LPS	— Low-Pressure/Loss-of-Charge Switch
LS	— Limit Switch
OFM	— Outdoor Fan Motor
OP	— Overload Protection
QT	— Quadruple Terminal

RVR	— Reversing Valve
RVS	— Reversing Valve Solenoid
TB	— Terminal Block

TRAN — Transformer

Field Splice

Terminal (Marked)

Marked Wire

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.

542J

a48-7992

LEGEND	Potentiometer Defaults Settings:
DCV — Demand Controlled Ventilation	Power Exhaust	Middle
	Minimum Pos.	Fully Closed
IAQ — Indoor Air Quality
	DCV Max.	Middle
LALS — Low Temperature Compressor
	DCV Set	Middle
Lockout Switch
	Enthalpy	C Setting
OAT — Outdoor-Air Temperature

POT — Potentiometer

NOTES:

1.620 ohm, 1 watt 5% resistor should be removed only when using differential enthalpy or dry bulb.

2.If a separate field-supplied 24 v transformer is used for the IAQ sensor power supply, it cannot have the secondary of the transformer grounded.

3.For field-installed remote minimum position POT, remove black wire jumper between P and P1 and set control minimum position POT to the minimum position.

EconoMi$erIV Wiring — 542J150,180

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