floor plenum] with through an acoustically-lined sweep or
acoustically-lined multiple turning vane elbows provided to direct the flow
of air away from the back of the unit. Provide acoustical lining on the
interior of [the discharge air devices] [and] [the return air plenum] in
compliance with with requirements specified hereinafter in paragraph
"Cabinet Interiors Sound Attenuation".]
[Computer room air conditioning unit[s] shall be upflow discharge, [bottom
return,] [front return, ][rear return, ]draw-thru cooling coil, and shall
be fitted with collars for top supply duct connections. Upflow discharge
shall discharge air with a acoustical lined sweep or acoustically-lined
multiple turning vane elbows provided to direct the flow of air away from
the back of the unit. Supply (discharge air) ducting from the upflow units
shall be off of each blower discharge outlet, that is, one duct and duct
collar per blower. Provide acoustical lining on the interior of [the
supply air devices] in compliance with with requirements specified
hereinafter in paragraph "Cabinet Interiors Sound Attenuation".]
[2.1.12
Floorstand
Unit shall be provided with elevating [225] [300] [450] [600] mm [9] [12]
[18] [24] inches high floorstand or jacks for freestanding installation on
the main building floor. Floorstand or jacks shall elevate the unit to the
height of the raised computer floor and shall allow for leveling and
locking at the desired height. Floorstand or jacks shall be retractable,
or removable, for installing the unit directly on the raised floor. Unit
shall be fully gasketed (rubber or neoprene) to prevent air leakage at the
raised floor penetration.
][2.2
Corrosion Protection For Coastal Installations
**************************************************************************
NOTE: Specify corrosion protection for exterior
HVAC equipment, including air handling units, heat
exchanger coil surfaces, equipment casings, that is
exposed to the weather within 5 miles of a sea
(salt) water coast.
At these coastal locations, this corrosion
protection is also required on HVAC equipment within
buildings that are subject to the outside weather
conditions. Specifically, equipment requiring
protection is defined as the first HVAC equipment
(excluding louvers) met by the outside air in the
supply air ductwork system.
Specifier shall survey the HVAC equipment market
place, find and specify the manufacturer's standard
off-the-shelve anti-corrosion options for "coastal"
or "sea coast" installations. Specify the various
systems (utilizing the word "or") offered by three
competetive equipment selections. This approach is
by far less costly than specifying the custom
corrosion protection requirements below.
After thorough investigation, if standard
off-the-shelve anti-corrosion options are not
available, include the corrosion protection
requirements specified herein.
SECTION 15702N
Page 13
Previous Page
