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The requirements for combustion and ventilation This unit heater series is equipped with power
air depends on how unit will be installed. That is exhaust system. Do not
use any additional
either in confined or unconfined spaces. In both power exhaust systems or vent dampers. If
cases enough incoming air is required to any are used or failure to follow the instructions
eliminate negative pressure. provided may result in serious injury or death.
Confined or Unconfined Space A.) Use the following steps to ensure venting
system is adequately sized:
The National Fuel Gas Code defines an
"unconfined space" as a space whose volume is 1. Make sure that all unused openings have
greater than 50 cubic feet per 1000 Btu/Hr input been sealed.
of the installed appliance(s). A confined space
is 50 cubic feet or less per 1000 Btu/Hr input of 2. The venting system must be inspected for
the installed appliance(s). proper size and required horizontal pitch.
Verify there is no blockage or restrictions,
These unit heaters are not
recommended for leakage, corrosion or other deficiencies
installation in residential confined spaces. This that may lead to unsafe conditions.
is due to the fact at some point in time these air
openings may become blocked or eliminated 3. Close all building doors, windows, doors
by the owner
. The National Fuel Gas Code leading between the space in which
ANSI Z223.1 or CAN/CGA B149.1 or .2, the most appliance(s) are located and other spaces
current, must be strictly adhered to for providing of the building. Also turn on all exhaust
adequate combustion air. fans so that they all operate at there
maximum speeds. However, do not run
These unit heaters may be installed in confined summer exhaust fans and make sure all
spaces for commercial/industrial installation as fireplace dampers are closed.
long as these are two permanent openings
located one at the top and one at the bottom. 4. Start up unit heater(s) per the lighting in-
Each opening shall have a free area not less than structions provided and adjust thermostat
one square inch (6.4cm²) per 1,000 Btu/Hr of so that appliance will operate continuously.
total input rating of all units in the confined space
and communicating with interior areas having 5. With the unit in operation, check all draft
adequate infiltration from the outside. hood equipped appliances after 5 minutes
for any spillage by using either a burning
match or candle.
Combustion air openings must, at all times, be
kept free of obstructions. Any obstructions will 6. Once each appliance, which has been
cause improper burner operation and may result connected to the venting system, properly
in a fire hazard or carbon monoxide injury. vents when tested from the method outlined
above, all doors, windows, exhaust fans,
V
ENTING fireplace dampers and other gas-burning
appliances may be returned to their
Venting installations shall be in accordance with earlier conditions of use.
Part 7, Venting of Equipment, of the National
Fuel Gas Code, ANSI Z223.1 and applicable
provisions of CAN/CGA B149 Installation Codes
(latest editions), and any applicable provisions
of local building codes.
WARNING
6