29
EDX
Series
3.0
Installation
•
Combustion Air Requirements
Air Intake Cap
Burner Control Box
Guidelines:
Chart 3.7
•
Limitations for Length and Size of Combustion Air Intake Duct
General Requirements:
• No more than two 90° elbows are allowed.
• Allow for expansion. Use a 100 mm diameter flexible hose to connect the duct to the burner control
box.
• In humid environments, use insulated duct, PVC pipe, or DWV (drain waste vent) to prevent
condensation on the outer surface.
• Do not draw air from attic space or other areas with a negative pressure.
• A factory approved wall intake cap (P/N: WIV-4) must be used with horizontal outside air intake ducts.
The wall intake cap must be installed to prevent blockage. Locate the intake where dirt, steam, snow,
etc. will not contaminate or clog the intake screen.
• In locations where snow and rain are common, the use of a water drain in the air inlet ducting is
recommended.
• Separate air intake duct from vent pipe a minimum of 100 mm. Also, place pipe higher than adjacent
air intake duct.
Figure 3.28
•
Wall Intake Cap
Single Heater Intake
Dual Heater Intake
Air Intake Duct Size
Max. Intake Length
Duct Size
Max. Intake
100 mm
6,1 m
150 mm
6,1 m
130 mm
9,2 m
200 mm
9,2 m
150 mm
12,2 m
Consult factory for longer lengths.