Bryant 331JAV, 330JAV instruction manual IV. Electrical Controls and Wiring

FIELD 24-V WIRING

FIELD 115-, 208/230-, 460-V WIRING

FACTORY 24-V WIRING

FACTORY 115-V WIRING

1-STAGE THERMOSTAT TERMINALS

FIVE WIRE

W Y R G C

FIELD-SUPPLIED

FUSED DISCONNECT

		TWO-WIRE			208/230- OR
		HEATING-
		ONLY			460-V
					THREE
BLK	BLK		W2		PHASE
				GND	GND
WHT	WHT		COM
			W/W1		208/230-V
	GND	GND			SINGLE
115-V FUSED		JUNCTION	Y/Y2		PHASE
DISCONNECT		BOX	R	GND	GND
	SWITCH	CONTROL		CONDENSING
(WHEN REQUIRED)		BOX	G
				UNIT
			24-V
		TERMINAL
			BLOCK	NOTES: 1. Connect Y-terminal as shown for proper operation.
		FURNACE
				2. Some thermostats require a "C" terminal connection as shown.
				3. If any of the original wire, as supplied, must be replaced,
				use same type or equivalent wire.

A99071

Fig. 9—Heating and Cooling Application Wiring Diagram

for Single-Stage Thermostats and Single-Speed Condensing Units

NOTE: A releasing agent such as PAM cooking spray or equiva- lent (must not contain corn or canola oil, aromatic or halogenated hydrocarbons or inadequate seal may occur) and RTV sealant (G.E. 162, 6702, or Dow-Corning 738) are needed before starting installation. DO NOT substitute any other type of RTV sealant. G.E. 162 (P771-9003) is available through RCD in 3-oz tubes.

13. Reinstall relief box and inducer assembly.

NOTE: If inducer assembly gasket is damaged, use RTV sealant to seal inducer assembly to collector box.

14.Reconnect wires to the following components:

a.Draft safeguard switch.

b.Inducer motor.

c.Pressure switches.

d.Limit overtemperature switch(es).

e.Gas valve.

f.Hot surface ignitor.

g.Flame-sensing electrode.

h.Flame rollout switch(es), if applicable.

15.Reinstall internal vent pipe and enclosure on downflow furnaces only by reversing items 4a through 4c.

NOTE: A releasing agent such as PAM cooking spray or equivalent (must not contain corn or canola oil, aromatic or halogenated hydrocarbons or inadequate seal may occur) and RTV sealant (G.E. 162, 6702, or Dow-Corning 738) are needed before starting installation. DO NOT substitute any other type of RTV sealant. G.E. 162 (P771-9003) is available through RCD in 3-oz tubes.

16.Reinstall vent connector to furnace flue collar. After fully assembling vent connector to furnace flue collar, securely fasten vent connector to flue collar with 2 field-supplied, corrosion-resistant, sheet metal screws located 180 degrees apart and midway up the collar.

17.Replace blower access door only.

18.Turn power and gas to ON.

—6—

19.Set thermostat and check furnace for proper operation.

20.Verify blower airflow and speed changes between heating and cooling.

21.Check for gas leaks.

22.Replace control door.

WARNING: Never use a match or other open flame to check for gas leaks. Use a soap-and-water solution. A failure to follow this warning could result in fire, personal injury, or death.

IV. ELECTRICAL CONTROLS AND WIRING

NOTE: There may be more than 1 electrical supply to unit.

The electrical ground and polarity for 115-v wiring must be maintained properly. Refer to Fig. 9 and 10 for field wiring information and to Fig. 11 for unit wiring information. If the polarity is NOT correct, the furnace control will display rapid flashing on the status LED and prevent heat operation. The control system also requires an earth ground for proper operation of the microprocessor.

With power disconnected to unit, check all electrical connections for tightness. Tighten all screws on electrical connections. If any smoky or burned connections are noticed, disassemble the connec- tion, clean all parts and stripped wire, and reassemble properly and securely. Electrical controls are difficult to check without proper instrumentation; therefore, reconnect electrical power to unit and observe unit through 1 complete operating cycle.

The 24-v circuit contains an automotive-type, 3-amp fuse located on the main control. Any 24-v electrical shorts during installation, service, or maintenance could cause this fuse to blow. If fuse replacement is required, use ONLY a 3-amp fuse. The control will display code 24 when fuse needs replacement.

The control in this furnace is equipped with an LED status light to aid in installation, servicing, and troubleshooting. It can be viewed through the sight glass or window on blower access door. The control indicates status with the LED on continuously, rapid