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Model # HFP 225, Low Temperature Rise Separated Combustion Outdoor Gas Duct Furnaces

Low Temperature Rise Separated Combustion Outdoor Gas Duct Furnaces

Item # HFP 225 — Model # HFP 225, Low Temperature Rise Separated Combustion Outdoor Gas Duct Furnaces

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Power Exhausted (HFP) The outdoor gas duct furnace was design to be the primary heating source for a building and is certified for, non residential, commercial applications only. These furnaces are power vented eliminating any effect of an erratic chimney. Available in 11 models sizes from 75.000 to 400,000 btu/hr for either natural or propane gas operation. The airflow direction can be specified when ordering the unit. This duct furnace is certified for location downstream from the dehumidifier and has holes to drain any condensate that may flow onto the roof. There are many other options available including various types of gas control valves to suit specific requirements.

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Design Specifications Pool Water Heating and Flow Data Water Cooled AC/Geothermal Data Refrigerant Connection Sizes Air Temperature Rise Amp Draws Dimensions

Standard Features

- 115V control step down transformer with 24V gas controls

- 20 gauge aluminized steel cabinet

- 409 stainless steel drip pan

- 409 stainless steel heat exchanger and burners

- 80% thermally efficient

- C.S.A. certification for use in the US and Canada

- Certified to 3.0" W.C. external static pressure

- Differential pressure switch for proof of combustion air

- ETL certification

- High limit safety control

- Left side (when looking into the discharge) access to burner and gas controls with slide-out burner drawer

- Natural gas input

- Power exhauster motor

- Power exhauster relay for pre-purge and post-purge

- Separate electrical, venting and gas control access with fully gasketed doors

- Separate line voltage and low voltage terminal strips

- Side or bottom gas connection access

- Single stage intermittent pilot with continuous retry control system for operation on natural gas.

- Two-stage gas valve

Optional Features

- Adjustable differential air flow proving system
- Building management compatible gas controls for    modulation control using a 0-10 VDC or 4-20 mA input
- Control relay - double pole, double throw
- Control step down transformers for 208/230V/1Ph and    208/230/460/575V/3Ph
- Fan delay timer
- High and/or low gas pressure switches
- Manual reset high limit switch
- Mechanical modulation and electronic modulation controls    for natural gas
- Multiple furnace electronic amplifier for controlling up to 4    duct furnaces with one discharge air sensor
- Right side access to burner and gas controls
- Single stage intermittent pilot with lockout control system for    operation on propane gas
- Supply air fire stat
- Timed freeze protection
- Two-stage, mechanical modulation, and electronic    modulation controls for propane gas

Gas Connection Pipe Size

1/2 in

Approximate Unit Net Weight

303 lb

Approximate Unit Shipping Weight

398 lb

Footnotes

¹ Dimensions are subject to change without notice

Footnotes

¹ Dimensions are subject to change without notice

Footnotes

¹ Dimensions are subject to change without notice

Footnotes

¹ Dimensions are subject to change without notice

Btu/Hr Input

225,000

Btu/Hr Output

180,000

20°F Air Temperature Rise

8333 CFM

25°F Air Temperature Rise

6667 CFM

30°F Air Temperature Rise

5556 CFM

35°F Air Temperature Rise

4762 CFM

40°F Air Temperature Rise

4167 CFM

45°F Air Temperature Rise

3704 CFM

50°F Air Temperature Rise

3333 CFM

55°F Air Temperature Rise

3030 CFM

60°F Air Temperature Rise

2778 CFM

Air Temperature and External Static Pressure Limits

The maximum allowable discharge air temperature is 150ºF. The maximum allowable air temperature rise for Low Air Temperature Rise Outdoor Units is 60ºF. The maximum allowable air temperature rise f

Note

Ratings are shown for elevations up to 2000 feet. For higher elevations, the input rating should be reduced at the rate of 4% per 1000 feet elevation above sea level. For Canada, in elevations between 2000 and 4500 feet, the unit must be derated to 90% of the rating listed above.
Units approved for use in California by CEC.
High air temperature rise separated combustion/outdoor units include an air distribution baffle and restrictor change when compared to the low air temperature rise separated combustion/outdoor units. Field conversion of a high air temperature rise to a low air temperature rise unit (or the opposite) requires a factory supplied conversion kit. Many times a portion of the total discharge air, from the dehumidifier into the gas duct furnace, must be diverted around the duct furnace with a field supplied duct controlled with a hand damper to achieve the desired air flow through the furnace.

115/60/1 Supply Voltage

2.00 A

Total Unit Amp Draw

The total unit amp draw is a combination of the control step down transformer and the power exhauster motor. The control step down transformer includes damper actuators, ignition controllers, gas val

Dimensions - Diagram¹

Outdoor Gas Duct Furnace Schematic

Dimensions - B

40.84 in

Dimensions - C (Duct Height)

22.98 in

Dimensions - D (Duct Height)

24.06 in

Dimensions - F

40.11 in

Dimensions - G

34.38 in

Dimensions - Q

11.58 in

Dimensions - R

9.9 in

Footnotes

¹ Dimensions are subject to change without notice

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Product Specifications

Outdoor Gas Duct Furnaces