Detroit Radiant Products Company UH Series - Manual (Page 36)

36
UH Series
Room Air Combustion Systems
When operating this unit as a room air combustion appliance, the factory installed air intake collar
may be removed and the required air for combustion can be taken into the appliance from the
space, so long as it is not a confined space. (See Figure 3.14)
A “confined space” is defined as a space whose volume is less than 50 cubic feet per 1,000
BTU/h of all the installed heating appliances.
Figure 3.14 • Combustion Air Intake Collar Removal
If the combustion air is supplied from indoors, the required volume of the space must be a
minimum of 50 ft
3 per 1,000 BTU/h, unless the building is of unusually tight construction. If the
building is of unusually tight construction with air infiltration rates of less than 0.40 air changes per
hour, outside combustion air is typically needed unless the sheer size of the building allows
otherwise. Contact the factory for further determination of the air infiltration rates.
The heater shall be located so as not to interfere with proper circulation of combustion air. A
minimum clearance of 12 inches all around the combustion air openings must be maintained at all
times. Special care should be taken to prevent inadvertent blockage of the combustion air inlet
holes.
Affix warning label adjacent to air intake holes as shown in Figure 3.14 (label is provided in kit). It
is the responsibility of the installer to ensure that there is a minimum 12 inch clearance around the
air intake openings.
3.0 Installation • Room Air Combustion Systems
WARNING
!
Do not draw combustion air from the space if the appliance is located within a confined
space. Insufficient combustion air may result in property damage, serious injury or
death. Use room air for combustion in installations with proper ventilation rates only.
Remove air intake collar by
loosening #8 sheet metal screws.
Affix label (provided in kit) when
using room air for combustion.
F/N: LLUH008
Room Air Warning