Bryant 310AAV, 310JAV warranty Cleaning Heat Exchanger Cell, Sequence of Operation

7/8”

A02151	A91252
Fig. 45—Position of Igniter to Burner	Fig. 46—Cleaning Heat Exchanger Cell

9.Using field-provided 25-caliber rifle cleaning brush, 1/4″ diameter steel spring cable, 36 in. long, a variable speed, reversible electric drill, and vacuum cleaner, clean cells as 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. 46.)

(3.) Work cable in and out of cell 3 or 4 times to obtain 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.) Reinstall burner assembly. Center burners in cell openings.

10.Remove old sealant from cell panel and inducer backing plate 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 inducer assembly and attach to cell panel using existing screws, making sure all screws are secure.

13.Reconnect wires to the following components (Use connection diagram on wiring label, if wires were not marked for reconnection locations.):

a.Draft safeguard switch.

b.Inducer motor.

c.Pressure switch(es).

d.Limit overtemperature switch.

e.Gas valve.

f.Hot surface igniter.

g.Flame-sensing electrode.

h.Flame rollout switches.

i.Install NOx baffles (if removed).

14.Reinstall internal vent pipe, if applicable.

15.Reinstall vent connector on furnace vent elbow. Securely fasten vent connector to vent elbow with 2 field-supplied, corrosion-resistant, sheet metal screws located 180° apart.

16.Replace blower access door only.

17.Set thermostat above room temperature and check furnace for proper operation.

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

19.Check for gas leaks.

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.

20. Replace outer access door.

Step 3—Sequence of Operation

→NOTE: Furnace control must be grounded for proper operation or control will lock out. Control is grounded through green/yellow wire routed to gas valve and manifold bracket screw.

Using the schematic diagram in Fig. 39, follow the sequence of operation through the different modes. Read and follow the wiring diagram very carefully.

NOTE: If a power interruption occurs during a call for heat (W), the control will start a 90-second blower-only ON period two seconds after power is restored, if the thermostat is still calling for gas heating. The red LED light will flash code 12 during the 90-second period, after which the LED will be ON continuous, as long as no faults are detected. After the 90-second period, the furnace will respond to the thermostat normally.

34