32
DX2
Series
4 in. 20 ft.
4 in.(single)/6 in.(dual) 20 ft.
5 in. 30 ft.
4 in.(single)/8 in.(dual) 30 ft
6 in. 40 ft.
Guidelines:
Gas Supply
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.
Air Intake Cap
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.
Air Intake Duct Size Max. Intake Length
Duct Size
Max. Intake Length
General
• No more than two 90 degree 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.
Chart 3.7
Limitations for Length and Size of Combustion Air Intake Duct
Burner Control Box
Single Heater Intake Dual Heater Intake
Consult factory for longer intake lengths.
3.0
Installation
•
Combustion Air Requirements
•
Gas Supply