AHAM RAC-1 and UL 484. Units shall include a self-contained, precharged,
slide-in and removable chassis-mounted, air-cooled refrigeration system.
Cooling section shall be equipped with a filter-drier on the suction line.
Fan and condenser motors shall have [open] [dripproof] [totally enclosed]
[explosion proof] enclosures.
2.4.2
Packaged Terminal Unit
Unit shall be a through-the-wall mounted, heavy-duty commercial grade,
factory assembled and precharged [air-conditioner] [heat pump] unit. Unit
shall be in accordance with ARI 310/380 and UL 1995. Units shall be
removable from inside the building for servicing without removing the
outside cabinet. Unit shall have a noise rating in accordance with ARI 350
and not exceed [_____] bels while the entire unit is operating at any fan
or compressor speed. Heat pump units shall contain a reversing valve to
change unit to heating cycle. An outdoor coil temperature sensor shall be
provided to guard against coil freeze-up by either switching to
supplemental heat only, or by cycling the compressor to defrost the coil.
2.4.3
Compressor
Compressor shall be hermetically sealed reciprocating, rotary, or scroll
type. Compressor shall be fitted with permanent split capacitor motor,
overload protection, and vibration isolators. Compressor shall be
protected against high discharge pressure, loss of charge, low voltage, and
short cycling.
2.4.4
Air-To-Refrigerant Coils
**************************************************************************
NOTE: Delete the copper or aluminum tubes and the
0.076 mm (3 mil) coating except in corrosive
environments.
**************************************************************************
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. Unit shipped
with a holding charge shall be field charged. A condensate removal system
shall be provided.
2.4.5
Fans
Indoor and outdoor fans shall be the centrifugal, direct driven type. Fans
shall be statically and dynamically balanced. Outdoor fan shall be
designed so that condensate will evaporate without drip, splash, or spray
on building exterior. Indoor fan shall be provided with a minimum
two-speed motor with built-in overload protection. Fan motors shall be the
inherently protected, permanent split-capacitor type.
SECTION 15700A
Page 15
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