24
FOR CANADIAN INSTALLATIONS ONLY
1.
All installations must conform with local
building codes, or, in the absence of local
codes, with current CAN/CGA-B149-
Installation Codes For Gas Burning
Appliances and Equipment.
2.
All electrical connections must be in
accordance with Canadian Electrical Code,
Part 1, CSA Standard C22.1.
All electrical connections must conform to the current edition of the Canadian Electrical Code, Part 1 CSA Standard
C22.1 and applicable local codes.
SECTION XII - RECIRCULATION
Recirculation of room air may be hazardous in the pres-
ence of:
• flammable solids, liquids and gases
• explosive materials such as grain dust, coal dust,
gunpowder, etc.
• substances such as refrigerants or aerosols which may
become toxic when exposed to heat or flame.
Recirculation is not recommended in uninsulated buildings
where outside temperatures fall below 32°F (0°C).
Excessive recirculation or insufficient ventilation air, which
results in inadequate dilution of combustion products gen-
erated by the heater, may create hazardous concentrations
of carbon monoxide, nitrogen dioxide, and other combus-
tion products in the heated space.
If gas fork trucks or other fossil fuel powered equipment
are utilized in the conditioned area, additional ventilation
requirements for the facility must be addressed separately.
The heater inlet shall be located in accordance with appli-
cable building code provisions for ventilation air.
Field constructed intake accessories should be properly
designed to minimize the entry of snow and rain.
All ventilation air to the heater shall be ducted directly
from the outdoors.
If in doubt regarding the application, consult the heater
manufacturer.
ETL labeled heaters must be equipped with a control sys-
tem and an air measuring station provided by the heater
manufacturer and installed on the return air damper or
duct.
WARNING: On heaters, which recirculate room
air, outside ventilation air must be provided in
accodance with the information shown on the
heater nameplate.
