York HFC-410A manual Communications, Filter Options, Outside Air Damper Options, Relief System

FORM 100.50-EG5 (108)

COMMUNICATIONS

BACnet MSTP (RS-485) Communications – This communication is available via optional Modlinc Gate- way. Communications to the unit are through a twisted pair, and the wire terminations are on the primary unit control board.

Modbus RTU Communications – This communication is standard on every Eco2 unit and can be used in lieu of the BACnet communications (only one can be used at a time).

FILTER OPTIONS

Filter Options – Two-inch 30% throwaway, cleanable, carbon or pleated filters in an angled rack are avail- able. For higher filtration requirements, optional rigid filter racks are available with twelve-inch 65% or 95% efficient rigid filters. Two-inch pre-filters are included with rigid filter options. The rigid filter rack option is available without filter media where field-supplied filters are required.

OUTSIDE AIR DAMPER OPTIONS

Manual Damper – This option includes a manually adjustable outside air damper. It is manually adjust- able at the unit by setting a mechanical stop between 0-100 percent.

Two-Position– This outside air damper option is con- trolled to a two positions, opened and closed. Determi- nation of the damper position is based on the occupancy schedule. In the occupied mode, the outside air damper is positioned to the manually configured point (set by mechanical stop). In the unoccupied mode, the damper is fully closed.

Modulating Economizer – This option includes modulating outdoor air and return air dampers that are interlocked and positioned by fully modulating, solid state damper actuators. Control of the damper is via a standard ambient outdoor air dry bulb sensor, or optional single or comparative enthalpy controls.

Rain Hoods on Outside Air Intakes – For all options with outside air intake openings, rain hoods are provided as standard to keep moisture from entering the equip- ment. Rain hoods as an integral part of the unit and are rotated into place.

RELIEF SYSTEM

Barometric Relief – Optional building air exhaust shall be accomplished through barometric relief dampers in- stalled in the return air plenum. The dampers will open relative to the building pressure. The opening pressure shall be adjustable via a spring tension adjustment.

Modulating Powered Exhaust with Damper Control– This option consists of a constant-speed exhaust fan with a discharge damper that is modulated to control the flow of exhaust air. The damper control logic is based on the building static pressure setpoint within the rooftop unit controller. The static pressure transducer is pro- vided in the return plenum of the rooftop unit, and 5/16” or 1/4” plastic tubing and static pressure sensor must be supplied by others and installed in a representative location in the building.

Modulating Powered Exhaust with a VFD – This option consists of a VFD to modulate the speed of the exhaust fan to control the flow of exhaust air. The VFD control logic is based on the building static pressure setpoint within the rooftop unit controller. The static pressure transducer is provided in the return plenum of the rooftop unit, and 5/16” or 1/4” plastic tubing and static pressure sensor must be supplied by others and installed in a representative location in the building.

SUPPLY FAN OPTIONS

DWDI Forward-Curved Supply Fan – The standard supply air blower is a forward-curved supply fan. This fan is good for medium static pressures and high airflows.

DWDI Airfoil Supply Fan – An optional airfoil blade supply fan is available on all models for higher static conditions. This option offers higher efficiency and lower sound in certain applications.

Fan Skid Isolation – The entire supply fan assembly is isolated from the unit base with one (standard) or two- inch deflection springs with optional seismic restraints.

Supply and Exhaust Fan Motors – High efficiency ODP, and standard and high efficiency TEFC motors are available all meeting the Energy Policy Act of 1992 (EPACT).

Supply Fan VFD and Manual Bypass – For VAV applications, VFDs are provided to modulate air flow. Optional manual bypass can also be provided to allow full airflow in the event of a VFD failure.

JOHNSON CONTROLS 5