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3.0
Installation
•
Combustion Air Supply
Chart 3.7
•
Limitations for Length and Size of Combustion Air Intake Duct
Single Heater Intake
Air Intake Duct Size
4 in.
5 in.
6 in.
General
• No more than two 90° elbows are allowed.
• Allow for expansion. Use a 4 in. 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.
• A factory approved wall intake cap (P/N: WIV-4) must be used with horizontal outside intake ducts.
The wall intake cap (P/N: WIV-4) must be installed to prevent blockage. Locate the intake where
dirt, steam, snow, etc. will not contaminate or clog the intake screen.
• Separate air intake duct from vent pipe a minimum of 4 ft. Also, place vent pipe higher than adjacent
air intake duct.
Air Intake Cap
Gas Supply
Important! Before connecting the gas supply to the burner control box:
• Verify that the heater's gas type (as listed on the rating plate) matches that of your application.
• Check that the gas piping and service has the capacity to handle the total gas consumption of all
heaters being installed, as well as any other gas appliances being connected to the supply line.
• Check that the main gas supply line is of proper diameter to supply the required fuel pressures.
• If utilizing used pipe, verify that its condition is clean and comparable to a new pipe. Test all gas
supply lines in accordance with local codes.
•
Operational Unvented Operation
Max. Intake Length
20 ft.
30 ft.
40 ft.
!
WARNING
!
Improperly connected gas lines may result in fire, explosion,
poisonous fumes, toxic gases, asphyxiation, or death.
Connect gas lines in accordance to national, state, provincial,
and local codes.
38
Dual Heater Intake
Duct Size
4 in. (single)/6 in. (dual)
4 in. (single)/8 in. (dual)
Consult factory for longer intake lengths.
DET3
Series
Max. Intake Length
20 ft.
30 ft.
Burner Control Box
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