Detroit Radiant Products Company LS3 Series - Manual (Page 30)

30
LS3 Series
Combustion Air Requirements
Combustion air may be supplied to the heater by indoor or outdoor means. Follow these guidelines and all
applicable codes for all models prior to installing the combustion air duct work. 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.
This unit comes standard equipped for connection of supplied outdoor air for combustion. It is designed
for outside air to be brought into the appliance from combustion intake ducts, and is referred to as a
“Separated Combustion” appliance.
This heater must operate as a separated combustion system if any of the following criteria apply:
• Chemicals such as chlorinated or fluorinated hydrocarbons (typical sources are refrigerants,
solvents, adhesives, degreasers, paints, paint removers, lubricants, pesticides, etc.) are present in
the atmosphere.
• High humidity.
• Contaminants such as sawdust, welding smoke, etc.
• Negative building pressure.
• Unusually tight construction where the air infiltration rate is less than 0.40 air changes per hour.
If your application does not meet any of these criteria, then room air may be used as supplying
combustion air to the heater. Refer to ‘Combustion Air Supply - Room Air’ on page 32 for details on how to
utilize room air for combustion.
Sufficient combustion air must be supplied to the appliance at all times.
Lack of combustion air may result in property damage, serious injury or death.
WARNING
!
3.0 Installation • Combustion Air Requirements
Roof
Roof Intake Cap
18 in.
minimum 6” pipe
Air Inlet Connection (Flexible boot and band
clamps are recommended) Air Inlet Connection
Burner
Control Box
Burner
Control Box
4” intake pipe 4” intake pipe
Figure 3.20 • Vertical Outside Air Supply for Common Intake • Side View
NOTE: Common intake
heaters must share the
same thermostat.