Bryant 362AAN instruction manual → III. Heat Exchanger and Flue Pipe, Ð7Ð

The procedure for nozzle installation and/or replacement is out- lined in oil burner instruction manual which came with furnace. For ease of maintenance, the oiling procedure for burner motor, as outlined in burner manual, should be performed at this time.

After replacement of nozzle, burner should be adjusted in accor- dance with Combustion Check section of this instruction.

→III. HEAT EXCHANGER AND FLUE PIPE

Ordinarily, it is not necessary to clean heat exchanger or flue pipe every year, but it is necessary to have your service technician check unit before each heating season to determine whether cleaning or replacement of parts is required.

A.Cleaning Secondary Heat Exchanger Tubes and Flue Pipe Only

If cleaning of only the secondary heat exchanger tubes and flue pipe is necessary, the following steps should be performed:

1. Turn off all oil and electrical supplies upstream of furnace.

CAUTION: If furnace has been in operation, some surfaces may be hot. Allow time for unit to cool down.

FLUE BOX

PARTITION

PANEL

CLEANOUT

PORT COVER

WING

CLAMP

NUT

CLEANOUT COVER GASKET

CLEANOUT COVER CLAMP BRACKET

INSULATION

A96311

2.Disconnect flue pipe.

3.For access to cleanout ports, remove blower door and filter. The 2 cleanout ports are located in blower compartment. They protrude through the partition and are located on the left and right of flue pipe. (See Fig. 2.)

4.Unscrew wing clamp nuts and remove cleanout port covers. This allows access to tubes. (See Fig. 2.)

CLEANOUT

PORTS

CLEANOUT PORT COVER & CLAMP ASSEMBLY

BLOWER

DOOR

A96310

Fig. 2ÐRemoving Cleanout Port Covers

5.Clean secondary tubes and flue pipe with a stiff brush and vacuum cleaner.

6.Before reinstalling cleanout port covers, the gasket on each cover MUST be replaced. Use cleanout port gasket kit Part No. 20196201.

7.Reinstall covers and tighten in place making sure that covers are properly seated over ports and gasket has sealed opening. (See Fig. 3.)

WARNING: Failure to replace cleanout port cover gas- kets, failure to properly seat covers over ports, and/or failure to securely tighten wing nuts could lead to flue gas leakage. This could lead to furnace damage, oil fumes, sooting, and severe bodily harm.

8.Reconnect flue pipe.

9.Reinstall filter and blower door.

Ð7Ð

Fig. 3ÐReinstalling Cleanout Port Covers

10.Turn on power to unit and readjust burner for proper operation. Inspect cleanout ports and flue connection to make sure there are no leaks.

B.Cleaning Both Primary and Secondary Heat Exchangers

If a more thorough cleaning is required (both primary and secondary heat exchanger sections), the following steps should be performed:

1. Turn off all oil and electrical supplies upstream of furnace.

CAUTION: If furnace has been in operation, some surfaces may be hot. Allow time for unit to cool down.

2.Remove blower door.

3.Disconnect flue pipe.

4.Remove outside flue collar.

5.Remove top rear panel.

NOTE: Blower removal as described in Blower Oiling and Removal section may be desired for easier access when cleaning with duct work attached.

6.Remove inside collar on flue pipe.

7.Remove top partition.

8.Place field-fabricated cardboard on metal tray beneath collector box to prevent debris from entering blower com- partment.

9.Remove flue collector box from secondary heat exchanger tube flange. This exposes inside surfaces of secondary tubes of heat exchanger.

10.Clean secondary tubes and flue pipe with a stiff brush and vacuum cleaner.

11.Remove louvered door.

12.Disconnect limit control wires.

13.Disconnect oil line and remove oil burner from furnace.

14.Remove observation door and collar on observation tube.

15.Remove intermediate panel. Care must be taken not to bend or damage limit control.

16.Loosen to hand tightness the 3 nuts labeled "A" in Fig. 4. Remove screws labeled "B" in Fig. 4. Slide combustion chamber forward out of heat exchanger. Be careful not to bump combustion chamber as it becomes brittle after having been fired.