Bryant Flue Gas Passageways, Combustion-Air Blower, Liquid Propane Supply Line Pressure Ranges

580J

Table 7 – Liquid Propane Supply Line Pressure Ranges

UNIT MODEL	UNIT SIZE	MIN	MAX
580J	All	11.0 in. wg	13.0 in. wg
		(2740 Pa)	(3240 Pa)

Manifold pressure for LP fuel use must be adjusted to specified range. (See Table 8.) Follow instructions in the accessory kit to make initial readjustment.

Table 8 – Liquid Propane Manifold Pressure Ranges

UNIT MODEL	UNIT SIZE	HIGH FIRE	LOW FIRE
580J	All	10.0 in. wg	5.0 in. wg
		(2490 Pa)	(1245 Pa)

Supply Pressure Switch

The LP conversion kit includes a supply low pressure switch. The switch contacts (from terminal C to terminal NO) will open the gas valve power whenever the supply line pressure drops below the setpoint. (See Fig. 32 and 33.) If the low pressure remains open for 15 minutes during a call for heat, the IGC circuit will initiate a Ignition Fault (5 flashes) lockout. Reset of the low pressure switch is automatic on rise in supply line pressure. Reset of the IGC requires a recycle of unit power after the low pressure switch has closed.

580JD08 only C08238

C08239

All 580J*D except DD08

Fig. 32 - LP Low Pressure Switch (Installed)

IGC	LP LPS
BRN	C	NO	BRN
J2-11			C
IGC			MGV
J2-12	GRA
TSTAT
W2	PNK

C08285

Fig. 33 - LP Supply Line Low Pressure Switch Wiring

This switch also prevents operation when the propane tank level is low which can result in gas with a high concentration of impurities, additives, and residues that have settled to the bottom of the tank. Operation under these conditions can cause harm to the heat exchanger system. Contact your fuel supplier if this condition is suspected.

Flue Gas Passageways

To inspect the flue collector box and upper areas of the heat exchanger:

1.Remove the combustion blower wheel and motor as- sembly according to directions in Combustion-Air Blower section. (See Fig. 34.)

2.Remove the flue cover to inspect the heat exchanger.

3.Clean all surfaces as required using a wire brush.

Combustion-Air Blower

Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the first heating season, inspect blower wheel bi-monthly to determine proper cleaning frequency.

To access burner section, slide the sliding burner partition out of the unit.

To inspect blower wheel, shine a flashlight into draft hood opening. If cleaning is required, remove motor and wheel as follows:

1.Slide burner access panel out.

2.Remove the 7 screws that attach induced-draft motor housing to vestibule plate. (See Fig. 34.)

3.The blower wheel can be cleaned at this point. If ad- ditional cleaning is required, continue with Steps 4 and 5.

4.To remove blower from the motor shaft, remove 2 setscrews.

5.To remove motor, remove the 4 screws that hold the motor to mounting plate. Remove the motor cooling fan by removing one setscrew. Then remove nuts that hold motor to mounting plate.

6.To reinstall, reverse the procedure outlined above.

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