The Reznor’s Model YDHA Package DX High Outside Air Space Conditioning Units
Model YDHA space condition unit provides superior control of high volumes of outside air in a package DX system design. The model’s feature set allows it to properly condition upward to 50% outside air while maintaining space temperature and humidity conditions. The unit’s blower system incorporates superior energy efficient blower design with variable speed control to balance and control the airflow as needed. The DX system maximizes efficiency with the use of digital scroll technology, ECM condenser fans and optimized coil designs. The DX system exceeds ASHRAE standard 90.1 requirements. Model YDHA includes the Tcore³ condensing heat technology. Tcore³ condensing gas heating system maintains greater than 90% efficiency throughout the modulated control range. The system features state of the art stand alone control system that further maxmizes energy use while maintaining space temperature condition.

Unit Features :
● 750 – 10,500 SCFM
● Direct drive backward incline plenum fan
● High external static pressure capability
● Factory installed ABB variable frequency drive
» Duct static pressure control
» Summer/winter constant volume
» External 0-10V signal
» Automatic low & high speed control
● Easy CFM verification for all fans
◊ Options:
– integrated energy recovery (Total enthalpy wheel)
– ECM power exhaust (Std 62.1 compliant)
– Dirty filter status

Mechanical Cooling:
● R410A refrigerant (environmentally friendly)
● High efficiency digital scroll technology
● 10-100% capacity control
● Fully interlaced coils
● Compressor anti-cycle programming
● Mechanical gauge connections
● High & low pressure switches
● Crank case heaters
● Anti-rust, dual sloped condensate drain pan
● Froststat, all circuits
◊ Options:
– low ambient control 35°F (1.7°C)
– High efficiency ECM condenser fans
– Hot gas by-pass
– Electrofin® coil coatings
– 5 year compressor warranty
– Compressor sound blanket
– Hail guards

Gas Heating:
● Natural gas or propane furnace
● Patented Tcore³
combustion control (patent #
8,113,269)
● High capacity heat for colder climates
● Minimum 80% thermal efficiency
● 2-4 stage control
● 409 stainless steel heat exchanger
● Failure/alarm diagnostics
◊ Options:
– 90% high efficiency heating
– 5:1 modulated temperature control
– 10:1 modulated temperature control
– Flue gas extension kit
– Condensate pumps
– Condensate neutralizers

Electric Heat:
● High capacity heat for colder climates
● 3-4 stage control
● Failure/alarm diagnostics
◊ Options:
– SCR control 0-100% modulation

Construction:
● Double wall foam panel construction – R13
● Hinged access doors with slam latches
● G90 Galvanized Steel Substrate, 60 Gloss Finish
● Convenient single door access panel for all controls, heating, and cooling sections)
● 4 point bottom lifting
● 4” pleated MERV 8 filters
● Vertical discharge, roof or pad mounting
● Full perimeter curbs
» 16” curb with vertical discharge
» 36” curb with horizontal discharge
◊ Options:
– 4” pleated MERV 13 filters
– 2 year all parts warranty

Controls:
● Single point power connections (208/1, 208/3, 230/3, 460/3, 575/3)
● isolated high voltage compartment
● ABB patented high voltage management system
● DDC unit controller output lED status
● Unit mounted display
● Easy unit & sequence configuration
» Thermostat
» Single & multi-zone VAV
» Variable volume & temperature control
● Unit alarm logging and retrieval
● Unit sensor and command values trending for
retrieval
● Easy unit functional test mode
◊ Options:
– Unit mounted disconnect w/ lockout
– Field mounted fusible disconnect
– Convenience outlet (field powered)
– Phase loss
– Smoke detector
– Remote display
– Hand held display
– Space temperature & humidity sensor
– Easy DDC system integration (BacNet or lon)

Intake (Options):
● 100% return (horizontal or vertical)
● Outside air hood
● Mixed air control
● Economizer control with CO2 demand ventilation
● User adjustable 2 position damper control
● Manual damper positioning external 0-10V signal