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- Moffitt - Indirect Fired Heater
Moffitt - Indirect Fired Heater
The Indirect Fired Heater is the key to a warmer, more comfortable building environment. It brings exterior make-up air into the facility where the air is filtered, then it travels across a tubular heat exchanger heated by an indirect gas-fired burner to raise the temperature. These heaters ensure proper pressure balance, steady air flow, and uniform temperatures. This heater is suitable for indoor and outdoor configuration up to 45,556 CFM. Each indirect 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. Glued and pinned insulation. 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.
- 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, pleated, and throwaway filters; various efficiency bag filters and HEPA filters.
- 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
- DX Plenum: Coil located in vertical or horizontal airflow. Drain pan when applicable.
- Coil Plenums: Heating coils- steam, hot water, and glycol cooling coils- chilled water, DX coil
- Motors: 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/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.
- High density insulation:
- 2″ thick
- 4″ thick
- Finish: corrosion resistant two-step acrylic.
- Special construction: aluminum, stainless steel, heavier gauges.