35
CL3
Series
3.0
Installation
•
Separated Combustion Systems
•
Combustion Air Supply
Combustion Air Supply - Room Air
Combustion air may be supplied to the heater by indoor or outdoor means.
If using combustion air 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 air infiltration rates.
Note:
When installed in a CNG maintenance facility, CL3 series heaters
must
utilize outside air for
combustion.
Figure 3.25
•
Outside Combustion Air Vertical Intake
- Side View
Figure 3.26
•
Outside Combustion Air Sidewall Intake
- Side View
Non-contaminated outside air for combustion must be ducted to the heater if any of the
following 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 there is an air infiltration rate of less than 0.40 per hour.
Roof Intake Cap
Roof
18 in.
minimum
Burner
Control Box
Air Inlet Connection
4” pipe
(Flexible boot and band clamps
are recommended)
Wall
Air Intake Cap
4” pipe
Burner
Control Box
Air Inlet Connection
(Flexible boot and band clamps
are recommended)
