make-up valve with float ball.
2.7.2.2
Fan Section
Fan shall be the [centrifugal] [propeller] type in accordance with
paragraph "Fans". Fan and fan motor shall not be located in the discharge
airstream of the unit. Motors shall have [open] [splashproof] [totally
enclosed] enclosure and be suitable for the indicated service. The
condensing unit design shall prevent water from entering into the fan
section.
2.7.2.3
Condensing Coil
**************************************************************************
NOTE: Delete the copper or aluminum tubes and the
0.076 mm (3 mil) coating except in corrosive
environments.
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Coils shall have [nonferrous] [copper or aluminum] tubes of 10 mm 3/8 inch
minimum diameter without fins. Coils shall be protected with a minimum
0.076 mm 3 mil thick [phenolic] [or] [vinyl] coating. Casing shall be
galvanized steel or aluminum. Contact of dissimilar metals shall be
avoided. Coils shall be tested in accordance with ASHRAE 15 at the factory
and be suitable for the working pressure of the installed system. Each
coil shall be dehydrated and sealed after testing and prior to evaluation
and charging. Each unit shall be provided with a factory operating charge
of refrigerant and oil or a holding charge. Unit shipped with a holding
charge shall be field charged.
2.7.2.4
Water Distribution System
Water shall be distributed uniformly over the condensing coil to ensure
complete wetting of the coil at all times. Spray nozzles shall be brass,
stainless steel, or high-impact plastic. Nozzles shall be the cleanable,
nonclogging, removable type. Nozzles shall be designed to permit easy
disassembly and be arranged for easy access.
2.7.2.5
Water Pump
The water pump shall be the bronze-fitted centrifugal or turbine type, and
may be mounted as an integral part of the evaporative condenser or remotely
on a separate mounting pad. Pumps shall have cast-iron casings. Impellers
shall be bronze, and shafts shall be stainless steel with bronze casing
wearing rings. Shaft seals shall be the mechanical type. Pump casing
shall be factory coated with epoxy paint. Pump motors shall have [open]
[dripproof] [totally enclosed] [explosion proof] enclosures. A bleed line
with a flow valve or fixed orifice shall be provided in the pump discharge
line and shall be extended to the nearest drain for continuous discharge.
Pump suction shall be fully submerged and provided with a galvanized steel
or monel screened inlet.
2.7.2.6
Drift Eliminator
Eliminators shall be provided to limit drift loss to not over 0.005 percent
of the specified water flow. Eliminators shall be constructed of
zinc-coated steel or polyvinyl chloride (PVC). Eliminators shall prevent
carry over into the unit's fan section.
SECTION 15700A
Page 26
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