2.10.4.3
Sectional Cleanable Filters
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NOTE: Delete the last three sentences if a washing
and cleaning unit is not necessary.
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Cleanable filters shall be [25] [50] mm [1] [2] inches thick. Viscous
adhesive shall be provided in 18.9 L 5 gallon containers in sufficient
quantity for 12 cleaning operations and not less than 1 L one quart for
each filter section. One washing and charging tank shall be provided for
every 100 filter sections or fraction thereof. Each washing and charging
unit shall consist of a tank and [single] [double] drain rack mounted on
legs. Drain rack shall be provided with dividers and partitions to
properly support the filters in the draining position.
2.10.5
Coil Frost Protection
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NOTE: If coil frost protection is required,
manufacturer's recommended coil frost protection
systems shall be evaluated. If the manufacturer's
standard coil frost protection is not appropriate,
determine if a hot gas bypass system is an
economical and practical coil frost protection
system and modify the specification as required.
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Each circuit shall be provided with a coil frost protection system which is
a manufacturer's standard. The coil frost protection system shall use a
temperature sensor in the suction line of the compressor to shut the
compressor off when coil frosting occurs. Timers shall be used to prevent
the compressor from rapid cycling.
2.10.6
Pressure Vessels
Pressure vessels shall conform to ASME BPVC SEC VIII D1 or UL 207, as
applicable for maximum and minimum pressure or temperature encountered.
Where referenced publications do not apply, pressure components shall be
tested at 1-1/2 times design working pressure. Refrigerant wetted carbon
steel surfaces shall be pickled or abrasive blasted free of mill scale,
cleaned, dried, charged, and sealed.
2.10.6.1
Hot Gas Muffler
Unit shall be selected by the manufacturer for maximum noise attenuation.
Units rated for 100 kW 30 tons capacity and under may be field tunable type.
2.10.6.2
Liquid Receiver
A liquid receiver shall be provided when a system's condenser or compressor
does not contain a refrigerant storage capacity of at least 20 percent in
excess of a fully charged system. Receiver shall be designed, filled, and
rated in accordance with the recommendations of ARI 495, except as modified
herein. Receiver shall be fitted to include an inlet connection; an outlet
drop pipe with oil seal and oil drain where necessary; two bull's-eye
liquid level sight glass in same vertical plane, 90 degrees apart and
perpendicular to axis of receiver or external gauge glass with metal guard
and automatic stop valves; [thermal well for thermostat;] [float switch
SECTION 15700A
Page 40
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