The Reznor® Model RHH Gas Heating Air Handler
The first ever commercial gas-fired unit heaters with over 90% fuel efficiency was introduced on a Reznor heater in the early 1980s. This tradition continues with Model RHH, 90%+ efficient commercial air handler for makeup air application and space conditioning.
Model RHH is available in 4 sizes, 130MBH, 180MBH, 260MBH and 350MBH. Each size is designed for a minimum of 91% thermal efficiency and is available for use with either natural gas or propane. Model RHH units are approved for space heating and makeup air applications in commercial/industrial installations in the United States and Canada by the ETL Testing Agency.
Standard features include the Reznor TcoreCR heat exchanger and single burner combustion system, a multi-try direct spark ignition with 100% lockout, pressure switch to verify venter flow, resiliently isolated venter motor, a high temperature limit control, and a centrifugal belt-driven blower capable of up to 2” w.c. of total static pressure. Both the forward curved blower and the blower motor are factory installed on vibration isolation mounts.
All published airflow data are supported by AMCA tested and rated airflow performance curves. The energy usage of the system has been designed to meet the current ASHRAE Standard 90.1 (maximum 1.2 bhp per 1000 cfm).
Operation is controlled through an integrated circuit board. The circuit board monitors heater operation and has LED diagnostic indicator lights to identify abnormalities in heating control functions. Optional features include factory-assembled, modular sections – a draw-through cooling coil cabinet module with either chilled water or DX coil and an inlet air mixing box module with a variety of configurations and damper options. A complete heating and cooling advanced digital control package is available in addition to common industry standard analog thermostat control. Model RHH can include an optional downturn discharge air plenum and an intake weather hood with rain baffles (cabinet mounted on/off air damper can be used in conjunction with weather hood).
For more details on design, installation or selection of separated combustion, go to www.Rezspec.com.
STANDARD FEATURES:
● Patented* Tcore3 ® combustion system with TcoreCR heat exchanger
● Minimum 91% thermal efficiency throughout modulated range
● Maximum 70°F temperature rise (optional 120°F)
● Circuit breaker protected transformer for 24-volt controls
● Integrated circuit board with diagnostic indicator lights
● Multi-try direct spark ignition with 100% lockout
● High temperature limit control
● Vibration/noise isolated venter motor, blower(s) and blower motor (spring or rubber isolators)
● L50 bearing rating with a life expectancy of 150,000 hours
● Reverse airflow limit switch
● Airflow pressure switch to verify circulating blower operation on makeup air options
● Socketed, high quality switching relays to facilitate service
● All service and connections from a single side
● Through-the-cabinet or through-the-base gas connections
● Engineered heat exchanger condensate management
● Three hinged service doors with heavy duty hardware
● Fully gasketed control compartment door panel with safety door switch
● Through the cabinet or through the base gas connections
● Pre-coat white gloss cabinet finish; 60 gloss minimum and RAL 9001, meets ASTM B117 specification for salt spray for 1,000 hours
● 4-point lift eyes for rooftop mounting
● Heavy gauge steel base
● Double wall cabinet with insulation
FACTORY INSTALLED OPTIONS :
● Heat exchanger extended warranty – 5-year or 10-year
● Natural gas or propane
● UV germicidal lamps – ultraviolet emitter for neutralization of VOCs and airborne micro-organisms for improved IAQ – not filtration. (Requires cooling coil cabinet Option AU. Separate 115/1 or 208/1 or 230/1 wiring/breaker and a separate disconnect must be provided.)
● Supply voltage – 115/1; 208/1; 230/1; 208/3; 230/3; 460/3; 575/3
● Inlet air filters – 2” disposable or permanent; 2”, or 4” pleated disposable; arranged in vertical flat bank for ease of service
● Convenience outlet (requires separate power supply)
● Controls
◊ Space temperature heating only
– Analog single or two-stage gas valve with room thermostat control (thermostat is available as a shipped-separate accessory or may be field-supplied)
◊ Space or discharge temperature heating/cooling (FX06/07 platform) (optional room command module
required for space control)
– Digital two-stage heating/three-stage cooling
– 8:1 modulation heating (12.5% low fire capacity)/ two-stage cooling
◊ Discharge temperature makeup air (heating only)
– Analog 2-stage with 2-stage ductstat or electronic sensor and 2-stage valve
◊ Discharge temperature heating/cooling makeup air
– Digital two-stage heating/three-stage cooling
– Analog or digital high turn down ratio (modulation heat)/3-stage cooling
– 8:1 modulation heating (12.5% low fire capacity)/three-stage cooling, reheat control
● Cabinet configuration and construction
◊ Left or right side controls
◊ High R insulation value
◊ Inlet duct connection flange, or inlet on/off damper with duct flange
● Mixing box module – double wall
◊ Three inlet configuration combinations with 100% bottom return air opening and/or 100% outside air rear
opening
◊ Inlet air configuration with 30% outside air opening and 100% return air opening
◊ Manual, motorized 2 or 3 position, motorized modulating return air, or outside air and return air dampers
◊ Direct-coupled 24VAC damper actuators
◊ Damper control selections such as 0-135 ohms resistance potentiometer, building pressure, or 0-10 volt control
◊ Bottom return air screen
● Double wall downturn plenum cabinet
◊ Shutoff dampers
● Blower motor (1/4 to 5 HP) – see pressure drops and blower charts
◊ Open dripproof, TEFC (motors meet EISA specifications for efficiency)
◊ Adjustable sheave and belt
◊ Motor contactor; IEC motor starter; or factory-installed variable frequency drive
● Cooling coil module with coil
◊ DX coil (single, 50/50, or 1/3-2/3 circuit; galvanized or stainless casing; copper or aluminum fins [coated or uncoated]) – non-ozone depleting, R410A refrigerant
◊ Chilled water coil (3-45 tons; 1/4, 1/2, 3/4, or full circuiting; galvanized or stainless casing; copper or aluminum fins [coated or uncoated])
◊ Stainless steel removable drain pan
● DX coil module with dehumidification control. Single, dual and 1/3-2/3 circuit, main DX coil with modulating or standard reheat control
● Discharge Duct Flange
● Evaporative cooling module
◊ White pre-painted or 300 series stainless steel cabinet
◊ 300 series stainless steel reservoir
◊ Recirculating pump or AquaSaver microprocessor-based, timed water distribution system
– Water recirculating pump with optional (field installed) fill and drain kit
– AquaSaver water metering device with optional (field installed) freeze protection
◊ 12” CELdek® or GLASdek® UL 900 Class II noncombustible media
◊ 1” or 2” aluminum pre-filter
◊ Water hammer arrestor (field installed)
● Firestat
● Discharge temperature low limit
● Over/under voltage or phase loss protection
● High ambient limit (burner cutoff)
● Gas pressure switches (high, low, or both)
FIELD INSTALLED OPTIONS:
● Variable frequency drive (factory-installed is also available)
● Thermostats to match analog controls
● Gas pressure regulator
● Smoke detector (in ductwork)
● Remote control console and unit monitoring
● Fusible and Non-Fused Disconnect Switch (NEMA 3R) (Model RDH)
● Vent cap (Model PDH)
● Vertical Vent Extension Kit (Model RDH)
● 16” Insulated Roof Curb (Model RDH)
● Intake Air Hood with Rain Baffles (Model RDH)
● Perimeter roof curb transitions to (C)RGB/RPB roof curbs – for Model RDH replacement of Models (C)RGB/RPB (Model RDH)
● Downturn nozzles (25-65° or 50-90°) with directional louvers (Model PDH)
● Main unit disconnect switch
● M-Series condenser