accordance with ARI 320.
Water-cooled heat pumps used in open ground water
loop systems (groundwater-source systems) will be
rated in accordance with ARI 325.
At a minimum, efficiencies for split-systems will be
in accordance with paragraph "Equipment Efficiency".
Single phase split systems are typically available
with SEER values of 10, 11, 12, or 14. Three phase
split systems are typically available in 2 different
efficiency ranges; conventional efficiency and high
efficiency. Conventional efficiency units typically
have an EER value between 8.5 and 9.5 depending upon
the size of the unit. High efficiency units
typically have an EER value between 9.5 and 13.0.
The efficiency to specify for a split-system will be
based upon an economic comparison. Coordinate the
efficiency specified with manufacturers.
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Unit shall be an [air-cooled] [water-cooled] [evaporatively-cooled], split
system which employs a remote [condenser] [condensing unit], a separate
indoor unit, and interconnecting refrigerant piping. Unit shall be the
[air-conditioning] [heat pump] type conforming to applicable Underwriters
Laboratories (UL) standards including UL 1995. Unit shall be rated in
accordance with [ARI 210/240] [ARI 340/360] [ARI 320] [ARI 325]. 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". The remote unit shall be as specified in
paragraph REMOTE CONDENSER OR CONDENSING UNIT. Evaporator or supply fans
shall be double-width, double inlet, forward curved, backward inclined, or
airfoil blade, centrifugal scroll type. Condenser or outdoor fans shall be
the manufacturer's standard for the unit specified and may be either
propeller or centrifugal scroll type. Fan and condenser motors shall have
[open] [dripproof] [totally enclosed] [explosion proof] enclosures.
2.6.1
Air-to-Refrigerant Coil
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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 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. Unit shipped with a holding charge shall be
field charged. Separate expansion devices shall be provided for each
compressor circuit.
SECTION 15700A
Page 22
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