[rack,]. [Mount compressor assembly to the base on spring type vibration
isolation mountings. Mount the base on the floor on elastomer pads.]
[Mount assembly supporting base on [cantilevered, height reducing,] spring
type vibration isolation mountings, selected to limit transmissibility of
imbalanced forces at lowest equipment revolutions per minute to 5 percent.]
[Mount assembly on concrete inertia block, fitted with cantilevered, height
reducing, spring type vibration isolation mountings. Weight of concrete
inertia block shall be [2.0] [_____] times weight of supported assembly.
Select spring mountings to limit transmissibility of imbalanced forces at
lowest equipment revolutions per minute to 3 percent.] [Integral-to-unit
pipe or tubing, and conduit connection to [control panel] [and] [building
services] shall be through service rated flexible connectors.]
2.3
CONDENSERS, AIR-COOLED
**************************************************************************
NOTE: Currently, lowest SRN ratings, in the order
of 16 or 17, occur in units rated under 19,045 kW 65
MBH. Largest "quiet" equipment ratings are in 19-20
range.
**************************************************************************
Factory fabricated and tested, packaged, self-contained and ready for full
capacity operation after terminal point connections. Unit [shall be
manufacturer matched part of split system, and] shall conform to ARI 460,
ARI 210/240, and ARI 270. Unit shall produce a Sound Rating Number (SRN)
not greater than [16] [21] [_____].
2.3.1
Capacity Rating
Size the condenser for the capacity and conditions indicated.
2.3.2
Unit Casing
Construct casing of galvanized steel or aluminum sheet metal and galvanized
or aluminum structural members. Provide with lifting provisions, access
panels, removable legs, [discharge hood,] and fan and heat rejection coil
guards and screens.
2.3.3
Equipment and component items, when fabricated from ferrous metal, shall be
factory finished with the manufacturer's standard finish, except that items
located outside of buildings and subject to a salt atmosphere shall have
weather resistant finishes that will withstand 240 hours exposure to the
salt spray test conducted in accordance with ASTM B 117, using a 20 percent
sodium chloride solution. Immediately after completion of the test, the
specimen shall show no sign of blistering, wrinkling, cracking, or loss of
adhesion and no sign of rust creepage beyond 3.18 mm 1/8 inch on either
side of the scratch mark.
2.3.4
Fans
2.3.4.1
Propeller Fans
Propeller type fans shall be [direct] [V-belt] drive type with dynamically
balanced, adjustable or fixed pitch, aluminum or corrosion protected steel
blades. [V-belt drive wheels shall be mounted on corrosion protected drive
shaft supported by grease lubricated antifriction bearings with cast
SECTION 15602N
Page 13
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