Table of Contents
Advertisement
Combustion and Ventilation
Inside Air Contamination
All heaters experience some condensation during start-
up. The condensate from flue gas is acidic. Combustion
air can be contaminated by certain vapors in the air which
raise the acidity of the condensate. Higher acidity levels
attack many materials including stainless steel, which is
commonly used in high efficiency systems. The heater can
be supplied with corrosion-resistant, non-metallic intake air
vent material. You may, however, choose to use outside
combustion air for one or more of these reasons:
1. Installation is in an area containing contaminants
listed below which will induce acidic condensation.
2. You want to reduce infiltration into your building
through openings around windows and doors.
3. You are using AL29-4C stainless steel vent pipe,
which is more corrosion-resistant than standard
metallic vent pipe. In extremely contaminated areas,
this may also experience deterioration.
Products causing contaminated combustion air:
•
spray cans containing chloro/fluorocarbons
•
permanent wave solutions
•
chlorinated waxes/cleaners
•
chlorine-based swimming pool chemicals
•
calcium chloride used for thawing
•
sodium chloride used for water softening
•
refrigerant leaks
•
paint or varnish removers
•
hydrochloric acid/muriatic acid
•
cements and glues
•
antistatic fabric softeners used in clothes dryers
•
chloride-type bleaches, detergents, and cleaning
solvents found in household laundry rooms
•
adhesives used to fasten building products
•
similar products
Areas where contaminated combustion air commonly
exists:
•
dry cleaning/laundry areas
•
metal fabrication plants
•
beauty shops
•
refrigeration repair shops
•
photo processing plants
•
auto body shops
•
plastic manufacturing plants
•
furniture refinishing areas and establishments
•
new building construction
•
remodeling areas
•
open pit skimmers
Check for areas and products listed above before installing
heater. If found:
•
remove products permanently, OR
•
install TruSeal direct vent
Indoor Units
CAUTION: Combustion air must not be contaminated by
corrosive chemical fumes which can damage the heater and
void the warranty.
NOTE: Use of this heater in construction areas where
fine particulate matter, such as concrete or drywall dust,
is present may result in damage to the heater that is not
covered by the warranty. If operated in a construction
environment, a clean source of combustion air must be
provided directly to the heater.
NOTE: It is recommended that the intake vent be
insulated to minimize sweating.
This heater must be supplied with sufficient quantities of
non-contaminated air to support proper combustion and
equipment ventilation. Combustion air can be supplied via
conventional means where combustion air is drawn from
the area immediately surrounding the heater, or via direct
vent, where combustion air is drawn directly from outside.
All installations must comply with the requirements of the
NFGC (U.S.) and B149 (Canada), and all local codes.
Air Filter
An air filter is supplied standard with the heater. This filter
is shipped loose for field installation. Refer to the Air Filter
Kit Installation Instruction (Part No. 241338) for details.'
Figure 8.
Air Filter Box
F10676
11
Advertisement
Table of Contents
