Bryant 581A operation manual Typical Wiring Schematic and Typical Component Arrangement

LEGEND

Fig. 38 — Typical Wiring Schematic and Fig. 39 — Typical Component Arrangement

AHA	—	Adjustable Heat Anticipator	IFC	—	Indoor (Evaporator) Fan Contactor
BKR W/AT	—	Breaks with Amp Turns	IFCB	—	Indoor (Evaporator) Fan Circuit
BR	—	Burner Relay			Breaker
C	—	Contactor, Compressor	IFM	—	Indoor (Evaporator) Fan Motor
CAP	—	Capacitor	IGC	—	Integrated Gas Unit Controller
CB	—	Circuit Breaker	L	—	Light
CC	—	Cooling Compensator	LED	—	Light-Emitting Diode
CH	—	Crankcase Heater	LOR	—	Lockout Relay
CLO	—	Compressor Lockout	LPS	—	Low-Pressure Switch
CLS	—	Compressor Lockout Switch	LS	—	Limit Switch
COMP	—	Compressor Motor	MAT	—	Mixed-Air Thermostat
CR	—	Control Relay	MGV	—	Main Gas Valve
CT	—	Current Transformer	NEC	—	National Electrical Code
DM	—	Damper Motor	OAT	—	Outdoor-Air Thermostat
DU	—	Dummy Terminal	OFC	—	Outdoor (Condenser) Fan Contactor
EQUIP	—	Equipment	OFM	—	Outdoor (Condenser) Fan Motor
FPT	—	Freeze Protection Thermostat	PL	—	Plug Assembly
FU	—	Fuse	QT	—	Quadruple Terminal
GND	—	Ground	R	—	Relay
GVR	—	Gas Valve Relay	RS	—	Rollout Switch
HPS	—	High-Pressure Switch	SN	—	Sensor
HS	—	Hall Effect Sensor	SW	—	Switch
HV	—	High Voltage	TB	—	Terminal Block
IDM	—	Induced-Draft Motor	TRAN	—	Transformer

NOTES:

1.Compressor and fan motors thermally protected; 3-phase motors protected against pri- mary 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.

5.On 208/230-v unit, TRAN1 is factory wired to ORN lead for 230-v power supply. If unit is to run on 208-v power supply, TRAN1 must be rewired. Disconnect the BLK wire on TRAN1 and connect wire to 208-v RED wire. Insulate 230-v ORN wire.

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 sig- nifies a single-pole, double-throw contact. An underlined number signifies a normally closed contact. A plain (no line) number signifies a normally open contact.

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Splice

Splice (Marked)

Splice (Field Supplied)

Factory Wiring Field Control Wiring Field Power Wiring Accessory or Optional Wiring

To Indicate Common Potential Only, Not To Represent Wiring

Fig. 38 — Typical Wiring Schematic (581A180, 208/230 V Shown)

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