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Indoor Separated Combustion Duct Furnaces
Indoor Separated Combustion (DFS) | For Heating, Heating/Cooling and Make-Up Air Systems
 The indoor separated combustion duct furnace was designed for use with a building's heating, heating/cooling and make-up air
systems. Separated combustion duct furnaces are specifically designed for buildings with hostile atmospheric conditions,
such as high humidity, or negative pressures. Available in 11 power exhausted model sizes, the unit covers a wide variety of
applications. They have input ranges from 75,000 to 400,000 Btu/Hr and can operate on either natural or propane gas. The airflow direction can be spec ified when ordering the unit. The duct furnace is certified for location either upstream or downstream from cooling coils and has a drain pan that allows connection to a condensate drain line.
Indoor Separated Combustion Duct Furnaces Standard Features:
- CSA certification for use in the US and Canada
- ETL certification
- 80% thermally efficient
- Power exhauster motor
- Separate electrical, venting, and gas control access with fully gasketed doors
- 20 gauge aluminized steel cabinet
- 115V control step down transformer with 24V gas controls
- Aluminized steel heat exchanger
- Aluminized steel 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 operation on natural gas
- Differential pressure switch for proof of combustion air
- Power exhauster relay for pre-purge and post-purge
- Separate line voltage and low voltage terminal strips
- Right side access to burner and gas controls (when looking into the discharge) with slide-out burner drawer
- Side or bottom gas connection access
- High limit safety control
Indoor Separated Combustion Duct Furnaces Optional Features - Factory Installed
- 409 stainless steel heat exchanger and burner
- 409 stainless steel drip pan
- Single stage intermittent pilot with continuous retry control system for operation on propane gas
- Two-stage, mechanical modulation, and electronic modulation controls for either natural or propane gas
- Building management compatible gas controls for modulation control using a 0-10 Vdc or 4-20 mA input
- 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/3Ph
- Left side access to burner and gas controls
- Adjustable differential air flow proving system
- Fan delay timer
- High and/or low gas pressure switches
- Manual reset high limit switch
- Timed freeze protection
- Supply air fire stat
- Control relay - double pole, double throw
- Installed thermostats - two-stage and electronic modulation
Indoor Separated Combustion Duct Furnaces Accessories - Field Installed
- Concentric vent kits—horizontal and vertical
- Power exhauster step down transformers for 460V and 575V
- Electronic programmable heat/cool room thermostats—for single and two stage units
- Smoke detector
- 7-day digital and 7-day econo time clocks
- Single-stage room thermostats
- Two stage room and duct thermostats
- Electronic two stage duct thermostats
- Electronic modulating room and duct thermostats and a room override for the duct thermostat
- Summer/winter switch
- Condensate connection drain kits
- Pipe hanger adapter kits
- 5-10 PSI gas pressure regulator
- Room thermostat guards
Indoor Separated Combustion Duct Furnaces Special Applications
A 409 stainless steel heat exchanger and burner is recommended when the unit is installed downstream of a cooling coil or evaporative cooler, and when the combined entering/return air to the unit is below 40°F.
Indoor Separated Combustion Duct Furnaces Variable Air Movement Applications
When the air mover supplied by others can provide variable air movement (i.e. 2-speed or variable frequency drive units), the
certified allowable minimum CFM of the separated combustion duct furnace can be 66% of the minimum listed CFM in Table 8.2 if the unit is applied as follows:
- The unit is provided with two-stage, mechanical modulation, or electronic modulation gas controls.
- The unit is provided with a factory installed discharge air controller.
- The system does not include a room thermostat.
The factory installed discharge air thermostat will prevent the unit from firing above the allowable 100°F rise when the unit is at or above the minimum CFM by monitoring the discharge air and going to low fire. A room thermostat cannot be used, because it is located remote from the unit, and could cause the unit to over-fire.
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Dehumidifier Corporation of America
W53 N550 Highland Drive - P.O. Box 917
Cedarburg, WI 53012
(262) 377-7501 - Fax: (262) 377-7502
Toll Free: 1-888-883-7602
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