Description
See attached spec sheet for full unit details.
GENERAL NOTES
– Unit performance is rated for 203 feet above sea level.
– Main Input Power: 460 Volts / 60 Hertz / 3 Phase
– Units to be constructed for outdoor use and have seismic certification (lp=1.5).
UNIT CASING
– Double wall casing consisting of 18 gauge galvalume steel outer with 22 gauge galvanized steel inner.
– 304 stainless steel inner liner in polymer tube HXGR and sump sections.
– 16 gauge all-welded 304 stainless steel interior floor with upturned edges around perimeter and openings.
– 2″, 1.5 pound density NFPA approved fiberglass insulation in roof and walls.
– 2″ sprayed urethane foam insulation under floor with an aluminized steel liner.
– Hinged unit access doors to be operable from inside and out and include 12″x12″ viewports (6 total).
– Hot dipped galvanized steel bar grating provided over the supply duct opening.
– Scavenger fan inlet plenum to be shipped loose for field installation by others.
STRUCTURAL AND FRAME
– Frame consisting of an all-welded structural steel base and integral lifting lugs. Frame to
be coated with an alkyd resin primer and two coats of a corrosion resistant acrylic latex.
POLYMER TUBE HEAT EXCHANGER WITH INDIRECT EVAPORATIVE COOLING
– Heat exchanger consisiting of horizontal polymer tubes, 304 stainless steel casing and aluminum end
sheets with a corrosion resistant coating. UV resistant PVC mist eliminator on scavenger outlet.
– Scavenger side spray nozzles, PVC water distribution piping, recirculation pump and flow switch.
– 16 gauge 304 stainless steel sump with water level controls and feed and drain valves.
– Evaporative cooling system provided with a sump water conductivity sensor for dissolved solids control.
FANS, MOTORS & VFDS
– AMCA certified direct-driven airfoil plenum supply fans with flex connectors, piezometer flow rings with transmitter, extended lube lines, acoustic outlet diffusers and motor removal rails.
– AMCA certified direct-driven centrifugal scavenger fans, shipped loose for installation by others.
– Supply fans to be mounted on 1″ deflection seismic spring isolators.
– Premium efficiency TEFC fan motors with 1.15 service factor and shaft grounding rings.
– Variable frequency drives with circuit breaker disconnects (no bypass) provided on fan motors.
– VFD control to be provided and networked to the BMS, by others.
DAMPERS
– Extruded aluminum, return and supply isolation dampers with floating point actuators.
– Extruded aluminum, back-draft type scavenger fan inlet dampers.
FILTERS
– Sixteen (16) 24″x24″x2″ aluminum mesh filters provided in scavenger inlet openings.
– Filter bank provided with a differential pressure transmitter.
COILS
– Casing constructed from double flanged galvanized steel. Sloped stainless steel drain pan under cooling coil.
– Aluminum fins die-formed and mounted to round seamless copper tubes.
CONDENSING SECTION
– Nominal 15 ton scavenger air-cooled system charged with R-410A.
– System to consist of a digital scroll compressor and aluminum fin / copper tube condenser coils.
– Condenser coils to have a corrosion resistant coating.
CONTROLS
– Factory-mounted DDC controls, programmed per included control sequence.
ELECTRICAL
– Units to be ETL labeled and wired in accordance with UL 1995.
– Unit power and sump wiring to be installed in liquid tight conduit. All other wiring is plenum rated and will not be installed in conduit.
– Each unit to include four (4) internal vapor proof LED lights with a switch.
– Each electrical enclosure to include an internal LED light (two total).
– Lighting power circuit (120V) to come from the main unit feed through a Munters provided transformer .
