aluminum tubes and the protective coating.
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Coil shall be compatible with the type of refrigerant used in the system.
Coil shall have [nonferrous] [copper or aluminum] tubes of 10 mm 3/8 inch
minimum diameter with copper or aluminum fins that are mechanically bonded
or soldered to the tubes. Coils shall be protected with minimum 0.076 mm 3
mils 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 shall be
suitable for the working pressure of the installed system. Coil shall be
dehydrated and sealed after testing and prior to evaluation and charging.
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. Coil shall mount within a heat recovery, factory-fabricated,
draw-through, central station type air conditioner in accordance with
Section 15895 AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM.
2.11.2
Hot Water Reclaim
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NOTE: Indicate on the drawings the size of the
exchanger either as a percent of the total rated
condenser load or as a percent of the superheated
portion of the total rated condenser load. The
refrigerant compressor head pressure control and the
circulating pump can be deleted if inapplicable.
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Unit shall be a double-wall, tube-within-tube heat exchanger type, complete
with thermostatic control. Unit shall be constructed and refrigerant
pressure/temperature rated in accordance with ASHRAE 15. Heat exchanger
coil shall consist of an external refrigerant containing carbon steel tube
and an internal, double-wall-in-metallic contact, convoluted, potable water
containing copper tube. Cabinet shall be fabricated of zinc-protected
steel and shall be internally insulated in coil space. The recovery device
shall be provided with a refrigerant compressor head pressure control and
an interlocked, potable water circulating pump. Pump and motor assembly
shall be close-coupled, manufacturer's standard type with indicated head
and capacity characteristics, and with brass, bronze, copper or stainless
steel wetted parts. Pump shall be mounted [remotely] [integral] to the
exchanger and be rated for [115] [208] [230] volt ac power supply.
2.12
PURGE SYSTEM
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NOTE: Refrigeration systems which operate below
atmospheric pressure (i.e., R-123 machines) will
require a refrigerant purge piping system. Indicate
the routing of purge piping on the drawings.
Require the Contractor to delete the piping if a
purge system is not required for the type of
refrigeration system that is to be provided.
Indicate that it will be the Contractor's
responsibility to size the piping based upon the
recommendations of the refrigeration system's
manufacturer. Purge discharge piping may be
connected to the pressure-relief piping on the
equipment side of the piping's vibration isolators.
SECTION 15652A
Page 27
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