Outdoor Power-Vented Gas-Fired Duct Furnace

• ETL Certification for Commercial and Industrial Use in the US and Canada
• Available in 10 model sizes with input ranges from 100,000 to 400,000 BTU/hr.
• Airflow ranges from 750 to 15,000 CFM.
• Achieves 81% thermal efficiency for fuel savings.
• Air temperature rise range of 20°F to 100°F.
• Compatible with natural or propane gas (field convertible from natural to propane).
• Certified for a maximum external static pressure of 3.0″ W.C. for high static applications.
• Constructed from 18-gauge aluminized steel with a baked-on polyester powder paint finish on exterior parts.
• Features a rail-type mounting base for slab installation.
• Includes a 115V control step-down transformer with 24V gas controls.
• Right or left-hand control access can be specified during ordering.
• Certified for installation either upstream or downstream from cooling coils and includes a drain pan that allows connection to a condensate drain line.
• Offers a wide range of controls, options, and accessories for unit customization to meet demanding specifications.
• Equipped with an integral power exhauster for low-profile installation.
• Utilizes an intermittent pilot with a continuous retry control system for natural or propane gas operation.
• Provides right-side access to the burner and gas controls (when facing the discharge) with a slide-out burner drawer.
• Features side or bottom gas connections.
• Includes high-limit safety controls.
• Contains separate line and low-voltage terminal strips.
• Comes with a combination combustion air/exhaust vent cap.
• Powered by a power exhauster motor.
• Designed, engineered, and assembled in the USA.

Factory-Configured & Installed Options

• Input Capacities:
  • 100, 125, 150, 175, 200, 225, 250, 300, 350, or 400 MBH

• Heat Exchanger, Burner, & Drip Pan Material:
  • All 409 Stainless Steel

• Control Stage Designation:
  • Single Stage or 2-Stage / Modulating

• Access Side:
  • Left-Hand Control/Piping Access
  • Right-Hand control/Piping Access

• Air Temperature Rise (ATR) Range:
  • High Temperature Rise (20°F – 100°F)
  • Low Temperature Rise (20°F – 60°F)

• Gas & Ignition Configuration:
  • Natural Gas with Continuous Retry Ignition Controller
  • Propane Gas with Lockout Ignition Controller

• Gas Valve Options:
  • Single Stage
  • Two Stage
  • Electronic Modulation
  • Electronic Modulation Primary (for multiple-furnace setups)
  • Electronic Modulation Secondary (for multiple-furnace setups)
  • Electronic Modulation with 0–10 VDC external input signal

• Safety Switches:
  • Standard or Premium Control Box (no additional gas pressure switches)
  • High & Low Gas Pressure Switch (Premium Control Box option)

• Supply Voltage:
  • 115V/1Ph, 208V/1Ph, 230V/1Ph, 208V/3Ph, 230V/3Ph, 460V/3Ph, or 575V/3Ph (60Hz)

• Control Power Transformer:
  • None, 40 VA, 75 VA, or 150 VA

Factory-Installed Control Devices:

• Airflow Proving Switch (Differential pressure switch)
• Timed Freeze Protection (Includes low discharge thermostat and freeze protection timer)
• Supply Air Fire Stat (Shuts system down if local temperature exceeds 200°F)
• Control Relay (Double-Pole, Double-Throw)
• Time Delay Relay (Delays blower start for heat exchanger warm-up)
• Factory-Installed Duct Thermostat (Honeywell T678A1015 shipped with ductwork sensing tube)

Field-Installed Accessories

• Thermostats, Sensors, & Adjusters:
  • Single-Stage Heat Only Room Thermostat (without switching)
  • Single-Stage Heat and Cool Room Thermostat (with switching)
  • Two-Stage Digital Non-Programmable Heating Room Thermostat (with switching)
  • Two-Stage 7-Day Programmable Room Thermostat (White Rodgers)
  • Duct Thermostat: Johnson Controls Electronic Temperature Control (with field-installed temperature sensor and dual relay module)
  • Duct Thermostat: Honeywell T678A1015 (Field-installed version with sensing tube)
  • Maxitrol Electronic Modulating Discharge Air Sensor & Mixing Tube (55°–90°F or 80°–130°F range)
  • Maxitrol Set Point Adjusters (TD121 or TD121A)
  • Maxitrol Room Override Thermostat (T115, 40°–90°F range)

• Transformers:
  • Field-Installed Step-Down Transformer (250 VA, 460V-to-115V or 575V-to-115V transformer for power exhauster motor control)

• System Controls & Components:
  • 7-Day Electronic Programmable Time Clock
  • Mild Temperature Thermostat (Dual relay with inlet air temperature sensor)
  • Photoelectronic Duct Smoke Detector (For 0.5–2.5 ft or 2.5–5.0 ft duct widths)
  • Natural Gas Pressure Regulator
  • Summer/Winter Switch (Double-pole, double-throw switch to disable heating in summer)

The HFP series is specifically designed for outdoor applications and features a weatherproof design. It is designed for use with standard air handling systems in 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 / Welding Booths
• Warehouse Pressurization