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Modular Direct Fired Heater (RD)
Modular Direct Fired Heater (RD)
Modular Direct Fired Heater (RD)

Modular Direct Fired Heater

(RD)

The Direct Gas Fired Make-Up Air package is designed to deliver tempered make-up air for installations requiring frequent air changes. Units are designed for natural and propane gas applications, with a max BTUH rate of 2,500,000, and are for indoor or outdoor installation.

A unique feature is the self-adjusting burner profile plates allowing 2-speed and variable-air-volume applications. The plates ensure proper air velocity and pressure drop across the burner for clean combustion. Spring-loaded profile plates react to the momentum of the fresh air stream, and therefore, no motors or actuators are needed to drive them, nor do they need to be manually set to a specific position.

Standard features include an intermittent spark ignition system with timed safety lockout and redundant gas valves. Units consist of a galvanized enclosure with an elevated gas burner which burns directly in the air stream. The burner consists of non-clogging, stainless steel combustion baffles attached to an aluminum gas supply section. The burner is capable of nearly 100% efficiency with a maximum turndown ratio of 30 to 1. The products of combustion mix with the make-up air which is introduced into the heater intake directly from outside the building. The burner module has a standard horizontal inlet and discharge duct connection and is located upstream of the blower module. The blower module has a standard horizontal inlet designed to accommodate an outside air inlet hood with standard 2" filters and screen.

To satisfy a variety of installation requirements, packages are available in a number of configurations which include additions of either a v-bank or an evaporative cooler intake module. All modules bolt together to form a rigid common base structure that mounts onto a single curb structure.

Combination packages that include both exhaust and supply fans mounted on a single roof curb are also available; please contact your sales representative for more information.

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  • Air Volume: 1,000 – 21,000 cfm
  • Maximum SP: 4" wg. @ standard air density
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Features

  1. G90 galvanized construction
  2. Easy access doors
  3. Lifting points
  4. Pre-wired, pre-piped controls
  5. Horizontal or down discharge
  6. Vibration isolation
  7. High efficiency motors
  8. Adjustable drive sheaves
  9. Fully insulated casing
  10. Stainless steel burner
  11. 120 volt control transformer with single point electrical connection
  12. Redundant gas valves
  13. Intermittent spark pilot with timed safety lockout
  14. Electronic flame modulation
  15. High temperature limit switch
  16. Airflow proving switch
  17. Economizer inlet thermostat
  18. Motor starter
  19. Disconnect switch
  20. Burner observation port

Options

  1. Propane fuel application
  2. Room override thermostat
  3. Motorized intake damper
  4. Remote control panel including summer/winter switch and operating lights
  5. Freeze stat with bypass timer
  6. Hi/low gas pressure switches
  7. Room modulating thermostat
  8. High gas pressure regulator
  9. Convenience outlet
  10. DX cooling coils
  11. Evaporative cooler intake
  12. V-bank filter intake
  13. Sloped filter intake
  14. Auxiliary starters
  15. Inlet gas pressure gauge
  16. Indoor hanging cradle
  17. VAV packages
  18. Roof curbs
  19. Clogged filter switch
  20. Cooling thermostat and interlock
  21. Extra set of V-belts
  22. DDC control capability for BACnet MS/TP, LonWorks, Johnson N2, and Modbus Protocol
  23. Z83.18 recirculating configuration

Certifications

The RD Model has been certified by ITS. This certification mark indicates that the product has been tested to and has met the minimum requirements of a widely recognized (consensus) U.S. and Canadian products safety standard, that the manufacturing site has been audited, and that the applicant has agreed to a program of periodic factory follow-up inspections to verify continued performance.

Model RD is ETL Listed under file number 103371695COL-001 and complies with ANSI Z83.4-Second Edition and CSA 3.7-2006 Standards.

Recirculating Model RD is ETL listed under file number 3035352-002 and complies with ANSI Z83.18 Standard – Fourth Edition.

Resources

Models

  1. R1D.250-G10 Direct Gas Fired Heated Make Up Air Unit with 10" Blower.
  2. R1D.250-G10D Direct Drive Direct Fired Heater Unit with 10" Blower in Size #1 Housing with speed control, disconnect switch.
  3. R1D.250-15D Direct Gas Fired Heated Make Up Air Unit with 15" Direct Drive Fan.
  4. R1D.500-G10 Direct Gas Fired Heated Make Up Air Unit with 10" Blower.
  5. R1D.500-G10D Direct Drive Direct Fired Heater Unit with 10" Blower in Size #1 Housing with speed control, disconnect switch.
  6. R1D.500-15D Direct Gas Fired Heated Make Up Air Unit with 15" Direct Drive Fan.
  7. R2D.250-G15 Direct Gas Fired Heated Make Up Air Unit with 15" Blower.
  8. R2D.250-20D Direct Gas Fired Heated Make Up Air Unit with 20" Direct Drive Fan.
  9. R2D.500-G15 Direct Gas Fired Heated Make Up Air Unit with 15" Blower.
  10. R2D.500-20D Direct Gas Fired Heated Make Up Air Unit with 20" Direct Drive Fan.
  11. R2D.750-G15 Direct Gas Fired Heated Make Up Air Unit with 15" Blower.
  12. R2D.750-20D Direct Gas Fired Heated Make Up Air Unit with 20" Direct Drive Fan.
  13. R3D.500-G18 Direct Gas Fired Heated Make Up Air Unit with 18" Blower and 12" Burner.
  14. R3D.500-24D Direct Gas Fired Heated Make Up Air Unit with 24" Direct Drive Fan and 12" Burner.
  15. R3D.750-G18 Direct Gas Fired Heated Make Up Air Unit with 18" Blower and 18" Burner.
  16. R3D.750-24D Direct Gas Fired Heated Make Up Air Unit with 24" Direct Drive Fan and 18" Burner.
  17. R3D.1000-G18 Direct Gas Fired Heated Make Up Air Unit with 18" Blower and 24" Burner.
  18. R3D.1000-24D Direct Gas Fired Heated Make Up Air Unit with 24" Direct Drive Fan and 24" Burner.
  19. R4D.1000-920 Direct Gas Fired Heated Make Up Air Unit with 20" Blower and 24" Burner.
  20. R4D.1000-30D Direct Gas Fired Heated Make Up Air Unit with 30" Direct Drive Fan and 24" Burner.
  21. R4D.1500-920 Direct Gas Fired Heated Make Up Air Unit with 20" Blower and 30" Burner.
  22. R4D.1500-30D Direct Gas Fired Heated Make Up Air Unit with 30" Direct Drive Fan and 30" Burner.
  23. R5D.2000-925 Direct Gas Fired Heated Make Up Air Unit with 25" Blower and 48" Burner.
  24. R5D.2000-36D Direct Gas Fired Heated Make Up Air Unit with 36" Direct Drive Fan and 48" Burner.
  25. R5D.2500-925 Direct Gas Fired Heated Make Up Air Unit with 25" Blower and 60" Burner.
  26. R5D.2500-36D Direct Gas Fired Heated Make Up Air Unit with 36" Direct Drive Fan and 60" Burner.
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