Carrier 39MN14WL4848211XXE Air Handling Unit

Carrier model 39MN14WL4848211XXE indoor air handling unit from the 39M series, serial 2818U36617, nameplate marked for service as AHU-3,17 and field-tagged AHU-17 on the fan section. The unit is a horizontal, multi-section air handler in a galvanized steel casing with hinged, latched access doors at each section for filter, coil and fan service, and is set on a floor-mounted steel support frame with ducted supply and return connections. Per the unit nameplate, the airside arrangement runs (A) mixing box, (B) flat filter section with pre-filters of (3) 16x20 and (3) 20x20 and main filters of (3) 16x20 and (3) 20x20, (C) chilled water and hot water coil section with plenum - chilled water coil 28MCV828FAA059BLNA and hot water coil 28MHV228HAA059BLNA, both rated 300 psig maximum operating pressure at 200 F, (D) blow-thru supply fan section with two 5 HP motors (10 HP total) at 1800 RPM, 460/3/60, 6.6/8.3/10 FLA/MCA/MOCP each and 15.4 maximum continuous amps, fan 39MBH9FVB29014FCCK, motor 93MS0725BA280X0XSB, VFD 93VFHJH07D21JBXXCX, and (E) discharge plenum. Visible controls and accessories include an ABB variable frequency drive with a lit keypad display mounted on the fan section, an Eaton heavy duty safety switch (30 A, 600 V) fed from panel 3DPH2 circuits 25, 27, 29, a motor-mounted disconnect, and a DriSteem Vapor-logic steam humidifier control cabinet mounted at the mixing box end of the unit. Chilled water supply/return, heating water supply/return and condensate piping are run to the unit with insulated headers and isolation valves. The unit is currently installed in place, hard-piped, ducted and wired, and will require disconnection by trades and rigging to remove. The ABB drive display was illuminated at the time of the site visit.