HVAC Direct-Fired 4000 Series Features & Benefits

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  1. Improved indoor air quality - Helps dilute and expel airborne contaminants making exhaust systems operate more efficiently
  2. Heating and ventilation flexibility - System can be designed to automatically modulate outdoor air, return air and/or discharge air volume to meet application needs
  3. Consistent temperatures and less stratification - Optional cooling effectively reduces indoor air temperatures to help keep people and processes productive
  4. Improved efficiency and quiet operation from airfoil style fans
  5. Less maintenance downtime - Fan bearings with L-10 rated life of over 100,000 hours
  6. Heavy-duty construction - Internal structural steel framework and exterior skin are welded together
  7. Ease of management and control - Optional computer-based Intellilgent Controls provide system information easily and effectively
  8. Cost savings - Heating systems deliver 100% of the heat generated into the building resulting in energy savings
Long Lasting Construction Provided by:
  1. Heavy-duty, corrosion-resistant galvanized steel housing
  2. Welded frame construction
  3. Two-coat, water-based, weather-resistant cabinet paint
  4. Heavy-duty factory-installed motor and drive package designed for long-lasting performance
Reliable, Efficient System Operation Provided by:
  1. 30:1 fully-modulating burner that maintains 100% combustion efficiency
  2. Airfoil fan wheel
  3. Electric spark iginition system
  4. System that puts 100% of the available heat in the airstream, not out a flue
  5. Compliance to ETL per ANSI Z83.18 or Z83.4 standards
  6. Unit that uses up to 50% less energy
  7. Remote Control Panel for easy operation and remote temperature adjustment
  8. Electronic fuel modulation providing immediate response
  9. Operation of fan only in warm weather to enjoy free ventilation cooling
  10. Positive low-fire start
  11. High temperature and low temperature automatic shutdown
  12. Fused primary circuits
Ease of Installation/Maintenance Provided by:
  1. Large tooled access doors for easy access to blower, motor, drives and burner
  2. Number-coded wires and terminal strips
  3. Blower installed downstream of burner for convenient access
  4. One power and gas connection
  5. Hoisting eyes for lifting and placing components
  6. Field start-up checklist and rigging manual
Typical Installations

Mezzanine-Supported Roof -Mounted
Direct-Fired Mezzanie- Supported Direct-Fired Roof Mounted
Suspended (Wall or Roof Inlet) Horizontal on Legs (Indoor or Outdoor)
Direct-Fired Suspended Wall or Roof Inlet Direct-Fired Horizontal on Legs - Indoor or Outdoor
Upright Indoor Upright Outdoor
Direct-Fired Upright Indoor Direct-Fired Upright Outdoor

OA = Outside Air DA = Discharge Air RA = Return Air

Other Options:

  1. Discharge plate or heads with optional motorized blades
  2. Roof curbs, mounting legs and service platforms
  3. Outdoor air filters, filter mix boxes and inlet hoods/plenums (High efficiency filtration available)
  4. Class II and III fan wheels / aluminum wheels and inlet cones
  5. Double-wall, high temperature and stainless steel cabinet construction
  6. Premium-efficiency motors
  7. Low-leakage dampers
  8. Usable with high external static and high gas inlet pressures
  9. Variable frequency drive

Intelligent Control Features:
  1. Module can monitor, diagnose, log and report on more than 30 functions including temperature, humidity and building pressure
  2. Windows™ based displays simplify and set up changes
  3. Hourly collection of air handler data allows trending and in-depth analysis
  4. Compatible via modem or internet with Bacnet®, ModBus®, N2Bus®, Lonworks®, etc. systems

Conventional Controls Features:
  1. Low-temperature automatic shutdown
  2. Space temperature control for added comfort
  3. 7-day time clock
  4. Remote Control Panel with burner and blower switches for easy operation
  5. Mild weather stat
  6. Dynamic Building Pressure Control
Optional Cooling Packages

Evaporative Cooling

RAPID® 4000-Series evaporative cooling system is an economical solution. It requires no air-cooled condenser, chiller or cooling tower, chilled water pumps or distribution piping/insulation, major motor control center or electrical gear. Operating costs are a fraction of similar-capacity mechanical refrigeration systems.

Evaporative cooling works when warm air passes over specially treated wetted media. The heat passes from the air to the wetted media, causing the water to evaporate and inside air to cool.

Mechanical Cooling

For situations requiring temperature and humidity levels lower than the performance parameters available with outdoor air alone or with evaporative cooling, RAPID™ 4000-Series offer a broad range of cooling options.

Cooling options can be added by simply installing one of our coil sections equipped with the appropriate cooling coils and a condensing unit or chiller. The versatility afforded by the coil section enables you to utilize DX refrigerant, chilled water or other types of cooling coils in your system.

Reheating After Cooling

If your equipment is such that reheating the air after cooling is necessary to maintain comfort levels, an electric, hot-water or steam coil can be installed in the same RAPID™ coil section.

Heating coils can also be used as sources of heat instead of the standard direct-fired burner during the heating season. As such, they are more viable for certain kinds of projects, such as locations with a steam boiler plant for the process loads. Another option is to supplement your direct-fired heat with recovered heat by using a heat-recovery coil. Rapid Engineering can readily build units to take advantage of various situations.

Model Configurations

4000 MUA Models - Make-up Air
Direct-Fired MUA Model - Make-up AIr Design: 100% outdoor air and a modulating burner with a 30:1 turndown ratio. Discharge air volume can be fixed or variable (with use of variable frequency drive)
Function: Supplies direct replacement air for building mechanical exhaust
Application: Used as make-up air for inductrial processes which incorporate mechanical exhaust
4000 FR Models - Fixed Recirculation
Direct-Fired FR Model - Fixed Recirculation Design: Fixed 80% air turnover rate and 20% outdoor air replacement rate and a modulating burner with a 30:1 turndown ratio. Discharge air volume is fixed.
Function: Provides efficient, low-cost heating where minimum ventilation rates are required
Application: Used in warehouses, distribution centers, retail outlets, etc.
4000 AM Models - Air Management
Direct-Fired AM Model - Air Management Design: Variable outdoor air from 20% to 100% and a modulating burner with a 30:1 turn-down ratio. Discharge air volume is fixed
Function: Automatically responds to building pressure and temperature needs
Application: Used in industrial and commercial buildings that have air quality and specific air management requirements
4000 VAV Models - Variable Air Volume
Direct-Fired VAV Model - Variable Air Volume Design: 100% outdoor air and a modulating burner with a 30:1 turnover ratio. Discharge air volume is variable.
Function: Works the same as the AM Model, except all recirculated air passes through a bypass section, not the building.
Application: Used where building pressurization is desired and where contaminants produced by the industrial or commercial process should not be recirculated