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This system is available with various air control options to meet a wide range
of application requirements. Depending on the air control option ordered, the
supply air volume may be varied or the outside air may be supplemented with
up to 75% building air (recirculation) for increased energy savings.
These systems are designed-certified to ANSI Standards by the Canadian Stan-
dards Association (CSA). (NOTE: Optional recirculation is available for U.S.
installations only; recirculation is not available for Canadian installations.)
In order to retain certification, the installer must adhere to the installation and
operation requirements in the instruction manual. These direct-fired makeup
air systems are not approved for residential use.
1. Installation Codes/Requirements
Installation should be done by a qualified agency in accordance with the in-
structions in this manual and in compliance with all codes and requirements of
authorities having jurisdiction. The qualified agency installing this system is
responsible for the installation.
These units must be installed in accordance with local building codes. In the
absence of local codes, the unit must be installed in accordance with the Na-
tional Fuel Gas Code ANSI Z223.1a (latest edition) or CAN/CGA B149, In-
stallation Codes for Gas Burning Appliances. These codes are available from
CSA Information Services, 1-800-463-6727.
Before installation, always consult authorities having local jurisdiction to verify
that local codes and procedures are being followed.
The building should always provide adequate relief for the heater to operate at
its rated capacity. It should be noted that this can be accomplished by taking
into account, through standard engineering methods, the structure's designed
infiltration rate; by providing properly sized relief openings; by interlocking a
powered exhaust system; or by a combination of these methods. Excessive
recirculation or insufficient ventilation air which results in inadequate dilu-
tion of the combustion products generated by the heater may create haz-
ardous concentrations of carbon dioxide, carbon monoxide, nitrogen diox-
ide, and other combustion products into the heated space.
If the failure or malfunction of this heater creates a hazard to other fuel burn-
ing equipment in the building, interlock the system to open inlet dampers or
other such devices.
Recirculation Requirements - Do not install a system with optional recircula-
tion (building air) in the presence of flammable solids, liquids, or gases; explo-
sive materials (i.e., grain dust, coal dust, gun powder, etc.); or substances which
may become toxic when exposed to heat (i.e. refrigerants, aerosols, etc.). If a
system with recirculation is being installed in an area where propane fork trucks
or other fossil fuel powered equipment are used, the ventilation requirements
for that equipment must be met. Recirculation is not recommended in uninsu-
lated buildings where outside temperatures fall below 32°F (0°C).
If in doubt regarding an application, consult the heater manufacturer's repre-
sentative before installation.
Codes for Special Installations: (1) Aircraft Hangar -- Installation in an air-
craft hangar must be in accordance with the Standard for Aircraft Hangars,
ANSI/NFPA 409 (latest edition) or CAN/CGA B149 Installation Codes; (2)
Public Garage -- Installation in a public garage must be in accordance with the
Standard for Parking Structures, ANSI/NFPA 88A (latest edition) or the Stan-
dard for Repair Garages, ANSI/NFPA 88B (latest edition) or in Canada with
CAN/CGA B149 Installation Codes.
General
Description
(cont'd)
