Detroit Radiant Products Company UH Series - Manual (Page 26)

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UH Series
Venting
The UH Series unit heater must be vented as described here to properly direct the flue gases from the
unit to the outside atmosphere. The venting can terminate vertically through the roof (up) or horizontally
through a sidewall (sideways).
Follow these guidelines and all applicable codes for all models prior to installing the vent material. Local
codes may vary. In the absence of local codes, refer and comply with the National Fuel Code ANSI
Z223.1 (NFPA 54) latest edition or the National Standards of Canada.
All UH Series heaters come with a factory-installed vent and combustion air adapters for attaching vent
pipe to the heater. Attach the venting material to the adapter with three (3) non-corrosive sheet metal
screws. If necessary, drill pilot holes prior to attaching the vent pipe. The venting material must not be
smaller than the factory installed adapter.
Replacing Existing Equipment
If the unit heater is replacing existing equipment and using an existing vent system, inspect the venting for
proper size and horizontal pitch as directed in these instructions and the latest edition of the National Fuel
Gas Code, ANSI Z223.1 (NFPA 54) or CSA B149.1 Installation Code.
Determine that there is not blockage or restriction, leakage, corrosion or other deficiencies that can cause
hazards. The vent pipe should be corrosion-resistant galvanized steel of a thickness that meets the
National Fuel Gas Code. Minimum thickness for connectors varies depending on the pipe diameter. Never
vent the UH Series with PVC or plastic pipe.
3.0 Installation • Venting • Replacing Existing Equipment
Gas-fired heaters must be vented. Do not operate unvented.
A built in power exhauster is provided. Additional external
power exhausters are not required or permitted.
Insufficient ventilation and/or improperly sealed vents may
release gas into the building which could result in health problems, carbon monoxide poisoning or death.
Improper venting may result in fire, explosion, injury or death.
WARNING
!
Do not vent this appliance into another heater’s vents or through a masonry chimney.
Do not use dampers in the heater vent pipe.
Single Wall vent pipe must not pass through any unoccupied attic, inside wall, concealed space, or floor.
Un-insulated single wall vent pipe must not be used outdoors for venting appliances in regions where
winter design temperature is below freezing.
WARNING
!
If replacing an existing heater, vents may require re-sizing. Improperly sized venting
systems can result in vent gas leakage or condensation. Refer to the National Fuel Gas
Code ANSI Z223.1 (NFPA 54) or CSA B149.1 - latest edition. Failure to follow these
instructions can result in serious injury or death.
WARNING
!