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79InRoom Precision AC Tech Data Manual
2.02 OPTIONAL COMPONENTS
A. FLOORSTAND
1. The heavy gauge floor stand shall raise the unit above the subfloor to match the height of the
raised floor. Heights are available from 254 mm (10 in) to 610 mm (24 in) with 76 mm (3 in)
increments and shall be adjustable +/- 1.5 in. Adjustment is provided by threaded pedestals.
Vibration-absorbing pads shall be included with all floorstands and are recommended with
every installation.
2. Seismic floorstands shall be available in 305 mm (12 in), 457 mm (18 in), and 610 mm (24 in)
heights for areas where earthquakes are a concern.
B. PLENUM
1. Upflow discharge plenums (60 Hz only) shall mount on top of an upflow cooling unit to
direct and distribute conditioned air. The plenum shall be manually adjustable and provided
with double deflecting grilles. Plenums are a fixed height of 500 mm (19.6 in).
2. Downflow discharge base plenums (50 Hz and 60 Hz) shall sit beneath the downflow cooling
unit to direct conditioned air from front openings. Models available include dampers, grills,
or flexible duct connections. Plenums are a fixed height of 450 mm (17.7 in).
C. SMOKE DETECTOR
1. A smoke detector shall be factory-installed to sense concentrations of smoke and send a
signal to the main controller, shutting down the unit and activating a visual and audible alarm.
D. SPOT WATER DETECTOR (50Hz and 60Hz)
1. The spot water detector shall sense water and send an alarm signal to the display interface to
broadcast an alarm and shutdown the cooling unit. The water detector shall ship loose for
field installation.
2. The water detector shall be provided with 5 m (15 ft) of wire.
E. CABLE WATER DETECTOR (60Hz only)
1. A leak detection sensing cable shall be shipped loose with the unit. If water or other
conductive liquids contact the cable anywhere along its length, the main controller visually
and audibly annunciates the leak.
2. The detector shall be provided with 6 m (20 ft) of cable.
F. FLOW SWITCH
1. A single pole, double throw, flow switch shall moderate fluid flow when it exceeds or drops
below the set flow rate. The flow switch shall ship loose for field installation.
G. HOT GAS BYPASS VALVE
1. The 60 Hz cooling unit shall contain a spring loaded, thermally driven hot gas bypass valve
(HGBV). Activation of the HGBV shall maintain the evaporator coil temperature during low
load conditions to prevent condensate from freezing on the surface of the evaporator coil and
to protect the compressor from excessive cycling.
2. The 50 Hz cooling unit shall contain an electronically controlled HGBV, which is controlled
by a 0-10V signal to maintain the refrigerant capacity in the range of 50 to 100% of the
nominal capacity with constant compressor operation and constant evaporation temperature.