Troubleshooting Venting Problems - Desa VH Series Stove"VICTOR HEARTH" Owner's Operation And Installation Manual

ventinG instaLLation
Continued
Figure 26 - Typical Straight Installation
with Listed Chimney Liner
HIGH ALTITUDE INSTALLATION
Your DESA B-vent burner system has been
CSA tested and approved for operation at
altitudes in the USA from 0-2000 feet and in
Canada from 0-4500 feet.
When installing this burner system at an el-
evation above 2000 feet (in the USA), you may
need to decrease the input rating by changing
the existing burner orifice to a smaller size.
Reduce input 4% for each 1000 feet above
sea level. Check with your local gas company
for proper orifice size identification and proper
orifice for your location.
When installing this stove and burner system
at an elevation above 4500 feet (in Canada),
check with local authorities.
For assistance with any high altitude installa-
tion contact DESA's Technical Service Depart-
ment at 1-866-672-6040.
112127-01C
trouBLesHootinG
ventinG ProBLems
Most venting problems are caused by incor-
rect vent sizing, improper installation, or
inadequate air supply. A preliminary check
for a field problem might include:
• Checking the vent sizing according to
manufacturer's specifications, appliance
input, and venting configuration
• Examining the entire venting system for
faults such as disconnected joints for dam-
aged vent sections
• Making sure vent and air openings are not
obstructed
If these procedures do not reveal the source
of the problem, troubleshooting may include
attention to common venting problems.
FLUE GAS SPILLAGE
Spillage occurs when flue gases cannot exit
the vent system and back up into the dwelling.
A primary symptom of appliances equipped
with a Vent Safety Shutoff System (flue spill
switch) is unexplained appliance shutoffs.
Other symptoms of flue gas spillage at the
draft hood include condensation on walls
and windows and/or noticeable odors. Spill-
age may also result in the release of carbon
monoxide, a colorless, odorless, highly toxic
gas. A simple spillage test can be conducted
if spillage is suspected. See Checking Gas
Connection, page 18.
CAUSES OF SPILLAGE AND
CORRECTIVE ACTION
Incorrect Vent Sizing
If the vent is too small or too short, spillage
may occur. If the vent is too large, excessive
dilution air may cool flue gases and reduce
draft, causing spillage. The vent cap size
should also be checked. Check manufactur-
er's instructions, appliance input rating, and
appropriate sizing tables.
Venting Condition
Loose joints can affect draft and cause spill-
age. "Mashed" vent sections and damaged
vent caps can restrict flow and cause spillage.
Examine and replace as needed.
Obstructions
Small animals or birds may get into and block
the vent or draft hood outlet. Dust, lint, and
foreign objects may obstruct air inlets. Remove
obstructions and clean openings.
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