The Model RDF Indoor/Outdoor Direct-Fired Gas Heating/Makeup Air System For Commercial & Industrial Applications
The Reznor Model RDF Series single-blower, direct, gas-fired units are certified by C.S.A. to ANSI Standard Z83.18 and Z83.4, CSA 3.7. The units are designed for indoor or outdoor installation with cabinets of insulated, double-wall galvalume steel construction. Configuration is horizontal with either standard horizontal discharge or optional vertical discharge. The system is factory assembled and mounted on a curb cap for single unit field installation. The RDF Series has a heating range of 20 – 3,000 MBH and an air handling capability range of 1,000 – 28,000 CFM.
The blower section includes a single blower that is statically and dynamically balanced for vibration free operation. Depending on the model size and CFM requirements, the blower is either Class I or Class II. A selection
of motor horsepower and drive packages is available to match application requirements. Motor and drive packages include an IEC style contactor or starter, adjustable motor base, adjustable sheaves, and drive belts.
The direct-fired burner is cast iron with drilled ports and stainless steel mixing plates for high efficiency combustion, designed to meet ANSI emission requirements. The pilot and flame monitoring device is an electronic (hot surface) ignition system and flame supervision with 100% lockout. Burner firing rate is modulated by a temperature selector and sensor to maintain the desired discharge air temperature.
The gas train includes main and pilot gas shutoff valves, a manual shutoff leak-test valve, a pilot regulator, a pilot solenoid valve, and either dual solenoid valves or fluid power valves, depending on the application requirements that determine gas train selection. Gas trains meet ANSI Standards, and options are available to meet FM and /or GAP requirements.
STANDARD FEATURES:
Standard controls include a high and low airflow proving switches, automatic and manual high temperature limit controls, burner and blower service switches. A remote console control, a disconnect switch, a space override thermostat, a potentiometer, or a pressure sensing damper control device are all available as options or components of the air control option selected. Systems installed outdoors MUST include either an outside air hood or a Model REC evaporative cooling module.
● C.S.A. certified to ANSI Z83.18 and Z83.4 – C.S.A. 3.7
● Unit mounted electronic circuit board with diagnostic lights
● 100% makeup air
● 20 – 3,000 MBH Heating range
● 1,000 – 28,000 CFM range
● Double-wall, insulated industrial grade construction
● Horizontal configuration with horizontal discharge.
● Dynamically balanced centrifugal blower
● NEMA standard motor, IEC contactor (1/2 – 3 HP) or starter (5 – 30 HP)
● Adjustable belt drive
● Electronic modulated cast-iron burner with stainless steel mixing plates.
● Electronic modulating gas control (25:1 turndown ratio)
● Hot surface intermittent ignition system with prepurge time delay (U.S. Patent No. 5,556,272)
● 24-volt Transformer (fused secondary)
● Adjustable outside air temperature sensor (economizer)
● Safety limit controls including high and low air flow proving switches, automatic and manual high temperature limits, flame supervisor with 100% lockout
● Gas train with dual main solenoid valves, main and pilot manual shutoff valves, manual shutoff leak-test valve, pilot regulator, and pilot solenoid valve
● Burner and blower service switches
OPTIONAL FEATURES – FACTORY INSTALLED:
● Propane gas
● Manifold arrangements to meet FM and GAP requirements
● Motor and drive options to meet CFM requirements.
● Discharge air temperature gas control systems with and without space override
● 230/1, 208/3, 230/3, 460/3, 575/3 voltage alternates
● High ambient burner cutout control
● Combination makeup air-return air with constant or variable air volume supply controlled either by a manually set potentiometer or automatically by a remote building pressure sensor
● 2-position discharge damper
● Vertical (down) discharge with or without 2-position discharge damper.
● 115-volt convenience outlet
● Built-in lighted indicator panel
● Firestat(s) – discharge and/or return, 200°F
● Freezestat (automatic reset) with time delay relay
● Interlocking and/or control relays
● High and/or low gas pressure switches
OPTIONAL FEATURES – FIELD INSTALLED:
● Disconnect switch
● Screened outside air hood with moisture-eliminating louvers with or without filter section and 1” or 2” permanent filters (screened air hood or attached evaporative cooling module is required on outdoor installations to retain certification)
● Indoor filter sections with 1” or 2” permanent filters
● Roof curb – 16” high – with internal ductwork
● Add-on evaporative cooling module is available (see Evaporative Cooling Catalog)
● Remote control console