Indoor Separated-Combustion Gas-Fired Duct Furnace

• ETL certification for commercial and industrial use in the US and Canada.
• 81% thermally efficient
• 20-gauge aluminized steel cabinet
• 115V control step-down transformer with 24V gas controls
• 409 Stainless steel heat exchanger and burner with stainless steel separator strip
• Certified to 3.0” W.C. external static pressure
• Single-stage intermittent pilot with continuous retry control system for natural or propane gas operation.
• Right side access to burner and gas controls (when looking into the discharge) with slide-out burner drawer
• High limit safety control
• Control terminal board
• Provide separate electrical, venting, and gas-control access with fully gasketed doors to seal components from the environment.
• Combustion air is drawn completely from outside to ensure the unit always has a constant supply of fresh, clean air
• Since combustion air is introduced from outside, off-cycle vent losses are essentially eliminated, further improving building efficiency
• Horizontal or vertical two-pipe or concentric venting options
• Designed, Engineered & Assembled in the USA

• Two-stage or electronic modulation controls for either natural or propane gas
• Building management compatible gas controls for modulation control using a 0-10 Vdc
• Multiple-furnace electronic amplifier for controlling up to 4 duct furnaces with one discharge air sensor
• Gas control step down transformers for 208/230V/1Ph and 208/230/460/575V supply voltages
• Left side access to burner and gas controls
• Adjustable differential air flow proving system
• Fan delay timer
• High and low gas pressure switches
• Timed freeze protection
• Supply air fire stat
• Control relay – double pole, double throw
• Separate line voltage and low-voltage terminal strips
• Installed duct thermostat – electronic modulation

Field-Installed:

• Concentric vent kits
• Power exhaust step-down transformers for 450V and 575V
• Single and two-stage programmable heat/cool room thermostats
• Electronic two-stage duct thermostats
• Electronic modulating room and duct thermostats, including a room override for the duct thermostat
• Smoke detectors
• 7-day digital timers
• Summer/winter switch
• Condensate drain connection kits
• Pipe hanger adapter kits
• 5-10 PSI gas pressure regulators

Specifically designed for commercial and industrial buildings with harsh atmospheric conditions, such as high humidity or negative pressure, the DFS series is compatible with standard air handling systems for air conditioning, heating, or makeup air applications. Common applications include:

• Commercial Office Buildings
• Institutional Facilities
• Mechanical rooms
• Gymnasiums
• Multi-Purpose Rooms
• Cafeterias / Kitchen Hoods
• Lab Exhaust Hoods
• Bathroom / Locker Rooms
• Paint / Coatings Facilities
• Welding Booths
• Warehouse Pressurization