2.5.5
Remote Water-Cooled Condenser
Condenser shall be a factory-fabricated and assembled unit constructed and
rated in accordance with ARI 450. Condenser shall be of the shell-and-coil
or shell-and-tube type design. Condenser's refrigerant side shall be
designed and factory pressure tested to comply with ASHRAE 15. Condenser's
water side shall be designed and factory pressure tested for not less than
[1,000] [1,700] kPa [150] [250] psi. Condensers shall be complete with
pressure relief valve or rupture disk, water drain connections, refrigerant
charging valve, and stand or saddle. Low pressure refrigerant condenser
shall be provided with a purge valve located at the highest point in the
condenser to purge non-condensibles trapped in the condenser. Condenser
shell shall be constructed of seamless or welded steel. Coil bundles shall
be totally removable and arranged to drain completely. Tubes shall be
seamless copper, plain, integrally finned with smooth bore or integrally
finned with enhanced bore. Each tube shall be individually replaceable,
except for the coaxial tubes. Tubes shall be installed into carbon mild
steel tube sheets by rolling. Tube baffles shall be properly spaced to
provide adequate tube support and cross flow. Condenser performance shall
be based on water velocities not less than 0.91 m/s 3 fps nor more than 3.7
m/s 12 fps and a fouling factor of [0.00025] [0.0005]. Water-cooled
condensers may be used for refrigerant storage in lieu of a separate liquid
receiver, if the condenser storage capacity is 20 percent in excess of the
fully charged system for remote water cooled condensers.
2.5.6
Remote Evaporatively-Cooled Condenser
Condenser shall be rated and tested in accordance with the requirements of
ASHRAE 64. Condenser shall include fans, water pump with suction strainer,
electric motor and drive equipment, water eliminators if required,
condensing coil, liquid receiver if required, water pan or sump, spray
nozzles or water-distribution pan, water strainer, water make-up assembly,
bleeder with flow valve of the needle valve type sized for the flow
required or a fixed orifice, enclosure with suitable access doors, and
air-inlet and outlet openings. No water shall carry over into the unit
discharge outlet.
2.5.6.1
Condenser Casing
Enclosure shall be constructed of not lighter than [1.3 mm 18 gauge hot-dip
galvanized steel] [2.0 mm 0.080 inch aluminum], reinforced and braced.
Access doors or panels suitably sized and located shall be provided for
access to water nozzles or distribution pan, coils, and valves for
cleaning, repair, or removal of the item. Access doors or panels shall be
gasketed with synthetic rubber, or equivalent gasket material, and locked
in place with thumb screws or catches. One-half inch mesh hot-dip
galvanized steel or copper air-inlet screens shall be provided on each air
inlet.
2.5.6.2
Refrigerant Section
Condenser coil shall be constructed of unfinned copper or steel tubes
hot-dip galvanized after fabrication. The receiver shall be welded steel
and shall be fitted and tested in accordance with ARI 495. A refrigerant
charging valve shall be installed in the liquid line between the receiver
cut-off valve and the expansion device. Refrigerant section shall be
tested in accordance with ASHRAE 15 for the refrigerant employed in the
system.
SECTION 15620A
Page 22
Previous Page
