Page 12
WARNING
Insufficient combustion air can cause headaches,
nausea, dizziness or asphyxiation. It will also cause
excess water in the heat exchanger resulting in rusting
and premature heat exchanger failure. Excessive
exposure to contaminated combustion air will result
in safety and performance related problems. Avoid
exposure to the following substances in the combustion
air supply:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine base swimming pool chemicals
Water softening chemicals
De-icing salts or chemicals
Carbon tetrachloride
Halogen type refrigerants
Cleaning solvents (such as perchloroethylene)
Printing inks, paint removers, varnishes, etc.
Hydrochloric acid
Cements and glues
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
If indoor air is to be used for combustion, it must be free of
the following substances or the life of the heat exchanger
will be adversely affected: chlorine, carbon tetrachloride,
cleaning solvent, halogen refrigerants, acids, cements and
glues, printing inks, fluorides, paint removers, varnishes,
or any other corrosives.
NOTE -
Local codes may supersede any of these provisions.
GENERAL RECOMMENDATIONS AND
REQUIREMENTS
Unit heaters must be vented in compliance with the lat-
est edition of the National Fuel Gas Code (NFPA 54 /
ANSI Z223.1) in the USA and with CSA-B149.1 codes in
Canada, as well as applicable provisions of local building
codes, and the following instructions.
030-150 Units - The transition is a part of the combus-
tion air blower.
175-400 Units - A sheet metal transition is supplied
with this certified unit. It must not be modified or al-
tered and must be installed on the outlet of the com-
bustion air inducer assembly prior to the installation
of the vent connector. Failure to comply with this re-
quirement will void the certification of the unit by the
approval agencies.
Note - Different manufacturers have different joint
systems and adhesives. Do not mix pipe, fittings or
joining methods from different manufacturers.
Insulate any sections passing through unheated spaces
to minimize condensation. For excessive condensation
problem, a tee with a drip leg or clean-out maybe required.
Venting
NOTE -
The gas vent is a passageway, vertical or nearly
so, used to convey flue gases from an appliance, or its
vent connector, to the outside atmosphere. The vent con-
nector is the pipe or duct that connects a fuel-gas-burning
appliance to a gas vent or chimney.
Adequate facilities for supplying air for combustion and
ventilation must be provided in accordance with the cur-
rent edition of ANSI Z223.1, section 5.3 and CSA-B149
installation compliance codes, or applicable provisions of
local building codes.
All gas-fired appliances require air to be used for com
-
bustion. In many buildings today, there is a negative in-
door air pressure caused by exhaust fans, etc. If sufficient
quantities of combustion air are not available, the heater
or another appliance will operate in an inefficient manner,
resulting in incomplete combustion which can result in the
production of excessive carbon monoxide.
Combustion and Ventilation Air
TABLE 3
-030/400 CONNECTION PIPE SIZES
Model
Flue Outlet
in. (mm)
030, 045, 060, 075, 090, 105, 125, 150
4 (102)
175, 200, 250, 300
5 (127)
350, 400
6 (152)
