Flue gas passageways, Combustion--air blower – Bryant 580J*04--12 User Manual

Page 24

Table 6 – Liquid Propane Supply Line Pressure Ranges

580J SIZE

GAS

HEAT OPT

HEAT

LEVEL

MIN

MAX

All

A, C

All

11.0 in. wg

(2740 Pa)

13.0 in. wg

(3240 Pa)

All

Manifold pressure for LP fuel use must be adjusted to

specified range. Follow instructions in the accessory kit to

make initial readjustment.

Table 7 – Liquid Propane Manifold Pressure Ranges

GAS HEAT

OPT

HEAT LEVEL

HIGH FIRE

LOW FIRE

A, C

All

10.0 in. wg

(2490 Pa)

5.0 in. wg

(1245 Pa){

All

NA: Not Available
{

3 Phase models only

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. 29 and Fig. 30. 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.

C08238

Fig. 29 -- LP Low Pressure Switch (Installed)

PNK

TSTAT

GRA

BRN

IGC

J2-12

IGC

J2-11

BRN

MGV

LP LPS

C08285

Fig. 30 -- 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. 31.

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. 31.)

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.

580J