ASHRAE 15. Necessary supports shall be provided for all equipment,
appurtenances, and pipe as required, including frames or supports for
compressors, pumps, cooling towers, condensers, liquid coolers, and similar
items. Compressors shall be isolated from the building structure. If
mechanical vibration isolators are not provided, vibration absorbing
foundations shall be provided. Each foundation shall include isolation
units consisting of machine and floor or foundation fastenings, together
with intermediate isolation material. Other floor-mounted equipment shall
be set on not less than a 150 mm 6 inch concrete pad doweled in place.
Concrete foundations for floor mounted pumps shall have a mass equivalent
to three times the weight of the components, pump, base plate, and motor to
be supported. In lieu of concrete pad foundation, concrete pedestal block
with isolators placed between the pedestal block and the floor may be
provided. Concrete pedestal block shall be of mass not less than three
times the combined pump, motor, and base weights. Isolators shall be
selected and sized based on load-bearing requirements and the lowest
frequency of vibration to be isolated. Isolators shall limit vibration to
[_____] percent at lowest equipment rpm. Lines connected to pumps mounted
on pedestal blocks shall be provided with flexible connectors. Foundation
drawings, bolt-setting information, and foundation bolts shall be furnished
prior to concrete foundation construction for all equipment indicated or
required to have concrete foundations. Concrete for foundations shall be
as specified in Section 03300A CAST-IN-PLACE STRUCTURAL CONCRETE.
Equipment shall be properly leveled, aligned, and secured in place in
accordance with manufacturer's instructions.
3.1.1.2
Field Refrigerant Charging
a.
Initial Charge: Upon completion of all the refrigerant pipe
tests, the vacuum on the system shall be broken by adding the
required charge of dry refrigerant for which the system is
designed, in accordance with the manufacturer's recommendations.
Contractor shall provide the complete charge of refrigerant in
accordance with manufacturer's recommendations. Upon satisfactory
completion of the system performance tests, any refrigerant that
has been lost from the system shall be replaced. After the system
is fully operational, service valve seal caps and blanks over
gauge points shall be installed and tightened.
b.
Refrigerant Leakage: If a refrigerant leak is discovered after
the system has been charged, the leaking portion of the system
shall immediately be isolated from the remainder of the system and
the refrigerant shall be pumped into the system receiver or other
suitable container. The refrigerant shall not be discharged into
the atmosphere.
c.
Contractor's Responsibility: The Contractor shall, at all times
during the installation and testing of the refrigeration system,
take steps to prevent the release of refrigerants into the
atmosphere. The steps shall include, but not be limited to,
procedures which will minimize the release of refrigerants to the
atmosphere and the use of refrigerant recovery devices to remove
refrigerant from the system and store the refrigerant for reuse or
reclaim. At no time shall more than 85 g 3 ounces of refrigerant
be released to the atmosphere in any one occurrence. Any system
leaks within the first year shall be repaired in accordance with
the specified requirements including material, labor, and
refrigerant if the leak is the result of defective equipment,
material, or installation.
SECTION 15620A
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