When to Suspect a Combustor Problem

The best way to evaluate the performance of your EWF36A’s combustor is to observe the amount of smoke leaving the chimney - both when the combustor has “lighted-off” and when it has not. Follow these steps:

•With a ﬁre going and the combustor properly activat- ed, with the damper closed to route smoke through it as described in the Operation Section, go outside and observe the smoke leaving the chimney.

•Then, open the stove damper and once again check the smoke leaving the chimney.

You should see signiﬁcantly more smoke when the stove damper is open and exhaust does not pass through the combustor. However, be careful not to confuse smoke with steam from wet wood. Steam dis- sipates in the air quickly; smoke does not.

If this test indicates a problem, consider other possible factors as well, such as the weather or a change in the quality of your fuel. In warm weather, draft is weaker than it is in colder winter weather and ﬁres can burn sluggishly. Small, hot ﬁres are a good solution under these conditions.

Burning “green” (insufﬁciently seasoned) wood will result in poorer performance than burning properly seasoned fuel. You may have to run your ﬁreplace hot- ter (more air) to achieve acceptable performance using green or wet wood.

Also consider any changes in your operating routine. Once you have ruled out any other possible causes for a decline in performance, inspect and clean the com- bustor if necessary.

Inspecting the Combustor

Use a ﬂashlight and mirror, if necessary, to examine the combustor. If no ﬂy ash or damage is visible, the inspection is complete. If closer examination, cleaning or replacing is needed, go to the next section.

Removing, Cleaning or

Replacing the Combustor

1.Allow ﬁreplace to cool.

2.Tap the left and right wedges back and remove. (Fig. 32)

3.Carefully slide catalyst assembly to the back of the ﬁreplace and out of the retaining brackets.

4.Check the combustor’s honeycomb-like element for a buildup of ﬂy ash. If any is evident, take the combustor outside and clean it by blowing air gently through it. Do not push anything through the honey- comb; do not use compressed air to clear the pas-

Vermont Castings EWF36A

Wedge (In Place)
Catalyst	Wedge
	Catalyst As-
	sembly
FP1324

Fig. 32 Carefully tap out the wedges, then slide the Catalyst Assembly out of ﬁreplace.

sages. Such abrasion can scrape the thin coating of platinum (the catalyst) off the ceramic base, shorten- ing the catalyst’s life and reducing its effectiveness.

5.Inspect the element for damage or degradation. Although small hairline cracks will not affect per- formance, the element should be essentially intact. If the element is broken in pieces or has sections missing, it should be replaced. Call your local Ver- mont Castings authorized dealer for a replacement element.

6.If the element is in good condition and clean, rein- stall it in the ﬁreplace.

Operate the stove in your usual manner for two weeks, inspecting the chimney and the chimney connector frequently during this period.

If creosote does not build up as fast, it is likely that the performance change was caused by ﬂy ash deposits on the catalytic element. However, continue the inspec- tions of the chimney system for a few weeks to ensure that proper performance continues.

If you continue to ﬁnd a signiﬁcant creosote buildup or if you continue to see excessive smoke form the chimney, the catalytic element will need to be replaced. Contact your nearest Vermont Castings authorized dealer.

NOTE: Use only the replacement catalyst supplied by a Vermont Castings dealer.

How to Replace Gaskets

The EWF36A uses rope-type ﬁberglass gaskets to make a tight seal between some parts. With use, par- ticularly on those parts that move, gaskets can become brittle and compressed and can begin to lose their ef- fectiveness. These will need periodic replacement.

All of the gaskets used are made of ﬁberglass. The four sizes of replaceable gasket are listed below, along with their application.

20005167