Moffitt Corporation
Moffitt - Direct Fired Heater
A Direct Fired Heater is the key to a warmer, more comfortable building environment. Moffitt Direct Fired Heaters warm the building by introducing fresh air into the facility. These heaters ensure proper pressure balance, steady air flow, and uniform temperatures. It is suitable for indoor and outdoor configuration up to 125,000 CFM. Each direct fired heater unit ships factory wired, piped, and test fired. While these units are generally used for heating, they can also be fitted with direct expansion (DX) air conditioning coils or evaporative cooling systems.
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- Rapid response to temperatures deviating from a set point via integral BACnet controls.
- Discharge configurations
- End discharge (horizontal)
- Top discharge
- Bottom discharge
- Vertical up-flow / down-flow
- Stacked
- Indoor or outdoor installation.
- Turn-down ratio: up to 27:1.
- Assurances & testing
- ANSI Z83.4:2015/02/01
- ANSI Z83.25:2015
- CSA.7:2015/02/01
- CSA 3.19:2015 Ed.2
- ETL & C-ETL listed
- Housing: Welded structural or formed channel base frame with lifting lugs. Heavy-gauge color bond steel casing with rust resistant gray enamel paint finish. One-inch thick 1.5# density neoprene-coated fiberglass. Insulation is glued and pinned. Sloped roof for outdoor units.
- Blower/Motor: Rated forward curve DWDI centrifugal blower. Polished steel shaft with rust inhibitor. Maximum operating speed ≤75% of the first critical speed. ODP motor, 1800 RPM, T-frame, 1.15 service factor mounted on adjustable
- Bearings: ≥BMA 120, heavy-duty industrial
- Drives: designed for 150% motor brake HP
- ≤5 HP Adjustable V-belt drives
- ≥7.5 HP fixed drives on and larger
- Burner: High-efficiency burner with observation port and adjustable profile plates. Stainless steel mixing plates and aluminum gas manifold. 27:1 turndown ratio. Intermittent pilot assembly with spark igniter and ignition transformer. Solid state flame monitoring system.
- Manifold Pressure
- Natural gas 7-14″ W.C. or 1-5 PSIG
- Propane 11″ W.C.
- Assurance: ANSI Z83.4:2015/02/01, ANSI Z83.25:2015, CSA 3.7:2015/02/01 & CSA 3.19:2015 Ed.2. Factory wired, piped, and test fired.
- Turndown Ratio: 27:1
- 80/20 Mix Box: Cost-effective space heating and recirculation. Includes V-bank filter rack.
- Weather Housing: Control & manifold enclosure
- Inlet Hoods: Expanded metal screen inlet with optional 2″ filters.
- Filter Section: V-bank filter section with side access suitable for complete with filter gauge and/or indicating light.
- Filter: 2″ thick permanent or disposable filters; various efficiency bag filters and HEPA filters. Rack available.
- Winter Filter: On the burner discharge side.
- Damper: Motorized inlet & discharge damper parallel blade damper with a two-position spring return actuator and end switch.
- Roof Curb: Prefabricated galvanized roof curb 16″ or 24″ high; full perimeter on most units.
- Hinged Access Doors: Sealed with gasketing.
- Blowers: Backward inclined, air foil, and plug fans
- Hinged Access Doors: Door switches, special access door gasketing, #310 vent lock fasteners
- Discharge: 4-Way Adjustable discharge head provides 4 equal quantities of air in the conditioned space.
- Horizontal Discharge Head 180° vertical and horizontal adjustment with 360° of free rotationMotors: TEFC and high-efficiency, meeting, EEE and CSA standards and 2-speed
- Disconnect Switch: Weatherproof enclosure; non-fused or fused.
- Gas Train Requirements
- Meets Factory Mutual (FM) requirements.
- Meets Industrial Risk Insurers (IRI) requirements.
- High Gas Pressure Regulator – Required on natural gas with pressure more than 5 psig and LP applications more than 11 ” W.C.
- High/Low Gas Pressure Switches: Manual reset, gas pressure safety switches which lock out the burner in the event of gas pressure malfunction.
- Control Panels: NEMA4 or 12 custom unit mounted or remote enclosures. Explosion proof panels
- Finish:
- Corrosion resistant two-step acrylic
- Special Finishes and Coatings
- Special construction:
- Aluminum
- Stainless Steel
- Heavier Gauge Steel
- Cooling Add-Ons:
- Evaporative cooling module option
- DX cooling option