The Reznor® Model RDH High Efficiency Gas Heating Air Handler
Reznor’s RDH is the new rooftop, power-vented addition to the Reznor brand line of Pre-Engineered Ventilation Air-Handlers (PREEVA). Model RDH is available in 11 sizes from 75MBH to 400MBH. Each size is designed for a minimum 81% thermal efficiency and is available for use with either natural gas or propane.

Model RDH rooftop, power-vented heaters are approved for commercial/industrial installations in the United States and Canada by the ETL Testing Agency.

STANDARD FEATURES:
● ETL certification
● Minimum 81% thermal efficiency
● Maximum 100 deg F temperature rise
● Double wall cabinet with insulation
● Circuit breaker protected transformer for 24-volt controls
● Integrated circuit board with diagnostic indicator lights
● Multi-try direct ignition with 100% lockout
● High temperature limit control
● Vibration/noise isolated venter motor and blower motor
● L50 ball bearings with bearing life of 150,000 hours
● Reverse airflow limit switch
● Airflow pressure switch to verify circulating blower operation on makeup air options
● Easily convertible single gas orifice system
● Socketed, high quality switching relays to facilitate service>
● All service connections from a single side
● Through-the-cabinet or through-the-base electrical
● Engineered condensate management disposal system
● Three hinged service doors with heavy duty hardware

FACTORY-INSTALLED FEATURES:
● TCORE2 Titanium Stabilized Heat Exchanger -aluminized steel, 409 stainless steel, or 316 stainless steel (stainless steel heat exchanger required for 70 – 100 degree F temperature rise)
● Heat Exchanger Extended Warranty – 5-year or 10-year
● Natural Gas or Propane
● 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 Temperature Heating/Cooling
– Digital two-stage heating/three-stage cooling with room command module
– Digital electronic modulation heating (25% low fire – natural gas, 40% low fire – propane)/ two-stage cooling with room command module
◊ Discharge Temperature Makeup Air
– Analog 2-stage with 2-stage ductstat or electronic sensor and 2-stage valve; high fire/40% low fire modulating control
◊ Discharge Temperature Heating/Cooling Makeup Air
– Digital two-stage heating/three-stage cooling with room command module
– Digital electronic modulation heating (25% low fire – natural gas, 40% low fire -propane)/ two-stage cooling with room command module

● Supply Voltage – 115/1; 208/1; 230/1; 208/3; 230/3; 460/3; 575/3
● Unit mounted, lockable, non-fused service on/off switch
● Inlet Air Filters – 1″ or 2″ disposable or permanent; 1″, 2″, or 4″ pleated disposable; arranged in vertical flat bank for ease of service
● Cabinet Configuration and Construction (Double Wall)
◊ Left or right side controls
◊ High R-value insulation
◊ Inlet duct connection flange
◊ Discharge duct flange
● Mixing Box Module (Double Wall)
◊ with four R/A inlet and discharge configuration combinations including, bottom, and rear
◊ with two O/A – R/A inlet configuration combinations
◊ with manual, motorized 2 or 3 position, or motorized modulating return air or outside air and ◊ return air dampers with direct-coupled 24VAC damper actuators
◊ with damper control selections such as 0-135 ohms resistance potentiometer, building pressure, or 0-10 v control
◊ Bottom return air screen
● Downturn Plenum Cabinet (Double Wall)
◊ with shutoff dampers
● Blower Motor (1/4 to 5 HP) – see pressure drops and blower charts,
◊ Open dripproof, TEFC, premium efficiency, or 2-speed open dripproof
◊ with adjustable sheave and linked or solid belt
◊ with motor contactor; IEC motor starter; or factory-installed variable frequency drive
● Cooling Coil Module (Double Wall)
◊ with DX coil (single, dual or 1/3-2/3 circuit; galvanized or stainless casing; copper or aluminum fins (coated or uncoated))
◊ with 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))
◊ with removable stainless steel sloped condensate drain pan
● Evaporative Cooling Module
◊ with recirculating pump or AquaSaver timed water distribution
◊ with 6 or 12 cellulose or UL cellulose media
◊ with 1 aluminum pre-filter
● Convenience Outlet
● 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 FEATURES:
● 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)
● Fill and Drain or Freeze Protection Kit (for evaporative cooler)
● Vent Vertical Extension Kit
● Roof Curb – 16″ insulated perimeter curb
● Intake Air Hood with Rain Baffles