Bryant 315AAV instruction manual Igniter Position - Side View, Igniter Position - Top View

315AAV

A05025

Fig. 54 - Igniter Position - Side View

1-7/8

(47.6 mm)

A05026

Fig. 55 - Igniter Position - Top View

If it becomes necessary to clean the heat exchangers because of dust or corrosion, proceed as follows:

1.Turn OFF gas and electrical power to furnace.

2.Remove outer access door.

3.Disconnect vent connector from furnace vent elbow.

4.For downflow or horizontal furnace having an internal vent pipe, remove internal vent pipe within the casing.

5.Disconnect wires to the following components. Mark wires to aid in reconnection (be careful when disconnect- ing wires from switches because damage may occur):

a.Draft safeguard switch.

b.Inducer motor.

c.Pressure switches.

d.Limit overtemperature switch.

e.Gas valve.

f.Hot surface igniter.

g.Flame-sensing electrode.

h.Flame rollout switches.

6.Remove screws that fasten the collector box assembly to the cell panel. Be careful not to damage the collector box. Inducer assembly and elbow need not be removed from collector box.

7.Disconnect gas line from gas manifold.

8.Remove the four screws that attach the burner assembly to the cell panel. The gas valve and individual burners need not be removed from support assembly. Remove NOx baffles, if installed.

NOTE: Be very careful when removing burner assembly to avoid breaking igniter. See Fig. 54-55 for correct igniter location.

9.Using field-provided 25-caliber rifle cleaning brush, 36-in. (914 mm) long, 1/4-in. (6 mm) diameter steel spring cable, a variable speed, follows:

a.Remove metal screw fitting from wire brush to allow insertion into cable.

b.Insert the twisted wire end of brush into end of spring cable, and crimp tight with crimping tool or crimp by striking with ball-peen hammer. TIGHTNESS IS VERY IMPORTANT.

NOTE: The materials needed in item 9 can usually be purchased at local hardware stores.

(1.) Attach variable-speed, reversible drill to the end of spring cable (end opposite brush).

(2.) Insert brush end of cable into the outlet opening of cell and slowly rotate with drill. DO NOT force cable. Gradually insert cable into upper pass of cell. (See Fig. 57.)

(3.) Work cable in and out of cell 3 or 4 times to ob- tain sufficient cleaning. DO NOT pull cable with great force. Reverse drill and gradually work cable out.

(4.) Insert brush end of cable in burner inlet opening of cell, and proceed to clean 2 lower passes of cell in same manner as upper pass.

(5.) Repeat foregoing procedures until each cell in furnace has been cleaned.

(6.) Using vacuum cleaner, remove residue from each cell.

(7.) Using vacuum cleaner with soft brush attachment, clean burner assembly.

(8.) Clean flame sensor with fine steel wool.

(9.) Install NOx baffles (if removed).

A91252

Fig. 56 - Cleaning Heat Exchanger Cell

(10.) Reinstall burner assembly. Center burners in cell openings.

10.Remove old sealant from cell panel and collector box flange.

11.Spray releasing agent on the heat exchanger cell panel where collector box assembly contacts cell panel.

NOTE: A releasing agent such as 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.

12.Apply new sealant to flange of collector box and attach to cell panel using existing screws, making sure all screws are secure.

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