15
01/22
7102-803A
Negative pressure results from the imbalance of air available
for the appliance to operate properly. It can be strongest in
lower levels of the house.
Causes include:
• Exhaust fans (kitchen, bath, etc.).
• Range hoods.
• Combustion air requirements for furnaces, water
appliances and other combustion appliances
• Clothes dryers.
• Location of return-air vents to furnace or air conditioning.
• Imbalances of the HVAC air handling system
• Upper level air leaks such as:
- Recessed lighting
- Attic hatch
- Duct leaks
P. Frequently Asked Questions
O. Negative Pressure
Table 15.1
ISSUES
SOLUTIONS
Odor from appliance When first operated, this appliance may release an odor for the first several hours. This is caused
by the curing of the paint and the burning off of any oils remaining from manufacturing.
Metallic noise
Noise is caused by metal expanding and contracting as it heats up and cools down, similar to the
sound produced by a furnace or heating duct. This noise does not affect the operation or longevity
of the appliance.
Whirring sound
If the blower has been installed, the blower produces a whirring sound which increases in volume
as the speed is increased.
CONTACT YOUR DEALER for additional information regarding operation and troubleshooting.
Asphyxiation Risk.
• Negative pressure can cause spillage
of combustion fumes, soot and
carbon monoxide.
• Appliance needs to draft properly for safety.
WARNING
To minimize the effects of negative air pressure:
• Install the outside air kit with the intake facing prevailing
winds during the heating season
• Ensure adequate outdoor air for all combustion
appliances and exhaust equipment
• Ensure furnace and air conditioning return vents are not
located in the immediate vicinity of the appliance
• Avoid installing the appliance near doors, walkways or
small isolated spaces
• Recessed lighting should be a “sealed can” design
• Attic hatches weather stripped or sealed
• Attic mounted duct work and air handler joints and seams
taped or sealed
Do NOT operate a circulating fan within close proximity,
approximately 4 ft (1.2m), of appliance:
•
Can reverse air flow, blowing hot air into
appliance cavity.
• Can damage appliance blower due to overheating.
CAUTION
Fire Risk.
•
DO NOT BURN GARBAGE OR
FLAMMABLE
FLUIDS
SUCH AS
GASOLINE, NAPHTHA OR ENGINE OIL.
•
Do NOT burn treated wood or wood with
salt (driftwood).
• May generate carbon monoxide if burn material other
than wood.
May result in illness or possible death.
WARNING
Fire Risk.
Keep combustible materials, gasoline and
other flammable vapors and liquids clear
of appliance.
•
Do NOT store flammable materials in the
appliance’s vicinity.
•
DO NOT USE GASOLINE, LANTERN FUEL,
KEROSENE, CHARCOAL LIGHTER FLUID OR
SIMILAR LIQUIDS TO START OR “FRESHEN UP”
A FIRE IN THIS APPLIANCE.
• Keep all such liquids well away from the appliance
while it is in use.
• Combustible materials may ignite.
WARNING
