Remove The Bricks And The Brick Retainer; Remove The Lower Fireback; Remove And Inspect The Catalytic Element; Use An Inspection Mirror To Check Reflected View Of Secondary Probe - Vermont Castings Defiant 1945 Homeowner's Installation And Operating Manual

Alignment Notches
Left Wedge
Brick Guide
Brick Clip
Bricks
ST556
Fig. 43 Remove the bricks and the brick retainer.
Lower Fireback
Fig. 44 Remove the lower fireback.
St557
3. Carefully remove the catalytic combustor's refrac-
tory access cover, then remove the combustor. The inspect
refractory material is brittle; handle it carefully. (Fig.
catalytic ele
45)
3
4. Check the combustor's honeycomb-like element
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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-
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.
30001693
Right Wedge
St556
inspect
catalytic element
2
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ST557
ST558
ST558
Fig. 45 Remove and inspect the catalytic element.
Inspect
5. Inspect the element for damage or degradation.
Catalytic element
Although small hairline cracks will not affect per-
4
formance, the element should be essentially intact.
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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.
While the catalytic element is removed, check the
condition of the secondary air probe. Use an inspec-
tion mirror to locate the probe within the combustion
chamber. (Fig. 46) The probe should extend 1" to 1¹⁄₂"
into the chamber and show no signs of excessive de-
terioration, such as warping, corrosion, or short length.
A damaged secondary air probe can affect catalytic
performance. If the probe needs replacement, contact
your local dealer.
1"
Fig. 46 Use an inspection mirror to check the reflected view
of the secondary probe.
ST559
Secondary
Probe inspection
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Defiant Woodburning Stove
Catalytic Ele-
ment
Catalytic Access
Panel
ST559
31