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HIGH ALTITUDE INSTALLATION
Your IHP B-vent burner system has been tested and approved for
operation at altitudes in the USA from 0-2000 feet.
When installing this burner system at an elevation 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.
For assistance with any high altitude installation contact IHP's Techni-
cal Service Department at 1-800-655-2008
TROUBLESHOOTING VENTING PROBLEMS
Most venting problems are caused by incorrect 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 damaged vent sections
• Making sure vent and air openings are not obstructed
If these procedures do not reveal the source of the problem, trouble-
shooting 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. Spillage 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 12.
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
manufacturer's instructions, appliance input rating, and appropriate
sizing tables.
Venting Condition
Loose joints can affect draft and cause spillage. "Mashed" vent sec-
tions 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.
Lateral Run
Lengthy horizontal or non-vertical runs cause resistance to flow and
may reduce draft enough to cause spillage. The pitch of lateral runs
can also be a problem; lateral runs should be pitched 1/4" rise per
foot of horizontal run from the appliance to the vent.
10
VENTING INSTALLATION Continued
Elbows
Too many elbows cause excessive restriction of flow and may result
in spillage. Usually, two 90º turns can be tolerated in a properly sized
venting system. More than two may cause problems and necessitate
changing the system.
Negative Pressure in the Dwelling
An extremely tight house may not supply adequate combustion and
venting air. Use of mechanical exhaust such as a dryer vent or range
vent may worsen the problem. An air exchange system must be
installed in the dwelling to correct this problem.
Flue Gas Cooling
Venting exposed to extremely cold temperatures or venting of single
wall construction loses heat needed to maintain draft; massive ma-
sonry chimneys absorb needed heat. If the flue gases cool excessively,
draft is reduced and spillage may result. Use proper materials, insulate
and protect properly, reline when necessary.
Down Drafts
In certain wind conditions and in certain relationships with nearby
structures and objects, high pressure conditions may affect draft
negatively. Relocate the vent cap, raise its height, or use an approved
high wind cap.
www.Superiorfireplaces.US.com
127116-01A
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