unavailable in certain combinations or are
inappropriate for the application.
**************************************************************************
Unit shall be an [air-cooled] [water-cooled], self-contained type
air-conditioning unit. Unit shall be [a packaged unit with an internal
water-cooled condenser] [a split-system with a remote [condenser]
[condensing unit]]. Unit shall be designed and constructed for automatic
control of space conditions. Unit shall be in accordance with ASHRAE 127
and UL 1995. Unit shall be rated in accordance with [ARI 210/240] [ARI
340/360]. ARI certification is not required. The system shall be designed
and constructed for maximum reliability and ease of maintenance. Necessary
redundancy, access to refrigeration circuits, means of troubleshooting, and
malfunction alarms shall be provided. Unit shall be provided with
necessary fans, air filters, [coil frost protection,] [liquid receiver,]
internal dampers, mixing boxes, supplemental heat, and cabinet construction
as specified in paragraph "Unitary Equipment Components". Evaporator or
supply fans shall be double-width, double inlet, forward curved centrifugal
scroll type. Condenser or outdoor fans shall be manufacturer's standard
for unit specified and may be either propeller or centrifugal scroll type.
Fan and condenser motors shall have [open] [dripproof] [totally enclosed]
[explosion proof] enclosures. [Remote unit shall be as specified in
paragraph REMOTE CONDENSER/CONDENSING UNIT.]
2.8.1
Air-to-Refrigerant Coils
**************************************************************************
NOTE: Delete the copper or aluminum tubes and the
0.076 mm (3 mil) coating except in corrosive
environments.
**************************************************************************
[Evaporator] [Evaporator and condenser] coils 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 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. Units shipped with a holding charge shall be field
charged. Separate expansion devices shall be provided for each compressor
circuit.
2.8.2
Water-to-Refrigerant Coils
**************************************************************************
NOTE: Delete this paragraph if a remote
condenser/condensing unit is specified. Delete the
last two sentences if a once-thru water source is
not used in conjunction with the self-contained unit.
Delete the inapplicable fouling factor. In areas
where poor water conditions exist or where water
conditions are unknown, the 0.001 factor will be
specified. In areas where water is known to be
noncorrosive the 0.0005 fouling factor will be
SECTION 15700A
Page 28
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