Replacing the Manifold Assembly

Cleaning the Combustion Chamber and Flame-trap

1.Follow procedure outlined in “Removing the Manifold Assembly”.

2.Use a vacuum cleaner/shop vac to remove all loose debris in the combustion chamber (Figure 27A). Use compressed air to clear any dust or debris that may have accumulated in the flame trap.

3.Reassemble following the procedure under “Replacing the Manifold Assembly”.

Explosion Hazard

Tighten both manifold door screws securely.

Remove any fiberglass between gasket and combustion chamber.

Replace viewport if glass is missing or damaged.

Replace two piece wire connector if missing or removed.

Replace door gasket if damaged.

Failure to do so can result in death, explosion, or fire.

1.Check the door gasket for damage or imbedded debris prior to installation.

2.Inspect the viewport for damage and replace as required.

3.Insert the manifold assembly into the burner compartment making sure that the tab of the manifold tube engages in the slot of the bracket inside the combustion chamber (Figure 27B). The tab is located at the bottom of the burner for L.P. Models.

4.Inspect the door gasket and make sure there is no fiberglass insulation between the gasket and the combustion chamber.

5.Replace the two screws which secure the manifold assembly door to the combustion chamber. Tighten securely. There should be no space between the gasket part of the manifold door and combustion chamber. Do not operate the water heater if the door gasket is not sealed.

Figure 27A

Combustion Chamber

Tab

Flame-trap

Bracket

Figure 27B
Manifold Assembly
Close-up
	Slot
Tab	Bracket

6.Reconnect the manifold tubing, pilot tubing, and thermocouple to the thermostat. Do not cross- thread or apply any thread sealant to these fittings.

!Note: L.P. gas systems use reverse (left-hand) threads on the manifold tube.

!The thermocouple nut should be started and turned all the way in by hand. Note: These are left-hand threads. An additional quarter turn with a 7/16” open-end wrench will then be sufficient to seat the lockwasher.

7.Reconnect the igniter wire.

8.Turn gas supply on and refer to the "Lighting Instructions" on page 17.

9.Check for leaks. Use a chloride-free soap and water solution (bubbles forming indicate a leak) or other approved method. All leaks must be fixed immediately.

10.Replace the outer door.