tested and listed to conform to the requirements of
ARI 740 for refrigerant recovery/recycle systems by
a recognized national testing laboratory. The
system shall include separate storage vessel(s)
capable of storing the entire refrigerant charge of
the largest chiller.
The recovery/recycle unit shall be portable.
Chiller mounting or floor mounting of the system is
expensive and therefore is discouraged.
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A manually initiated refrigerant recovery/recycle system shall be provided,
consisting of a motor-driven, air- or water-cooled, reciprocating
condensing unit and a receiver of sufficient capacity to store the entire
refrigerant charge of the largest water-chilling system. For refrigerants
with atmospheric pressure boiling temperature below 20 degrees C 68 degrees
F the receiver shall be sized so that it is no more than 80 percent full at
32 degrees C 90 degrees F. For refrigerants with atmospheric pressure
boiling temperature above 20 degrees C 68 degrees F, the receiver shall be
sized so that it is no more than 90 percent full at 32 degrees C 90 degrees
F. The recovery/recycle system condensing unit shall be assembled as a
complete unit and meet the requirements of ASHRAE 15. The system
components shall be portable and shall include all valves, connections, and
controls required for operation. Receiver and relief devices shall conform
to the requirements of ASME BPVC SEC VIII D1. The recovery/recycle system
shall be tested and listed to conform to ARI 740 for refrigerant
recovery/recycle systems by a recognized national testing laboratory. For
refrigerants with atmospheric pressure boiling temperature below 20 degrees
C 68 degrees F, the recovery/recycle unit shall have an ARI 740 vapor
refrigerant recovery rate of no less than 8.5 kg/minute 17.0 lb/minute.
For refrigerants with atmospheric pressure boiling temperature above 20
degrees C 68 degrees F, the recovery/recycle unit shall have an ARI 740
vapor refrigerant recovery rate of no less than 1.0 kg/minute 2.2 lb/minute.
2.8.5
Automatic Tube Brush Cleaning System
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NOTE: Delete this paragraph unless specifically
required by the onsite staff.
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2.8.5.1
Brush and Basket Sets
One brush and basket set (one brush and two baskets) shall be furnished for
each condenser tube. Brushes shall be made of nylon bristles, with
titanium wire. Baskets shall be polypropylene.
2.8.5.2
Flow-Diverter Valve
Each system shall be equipped with one flow-diverter valve specifically
designed for the automatic tube brush cleaning system and have parallel
flow connections. The flow-diverter valve shall be designed for a working
pressure of [1,000] [1,700] kPa [150] [250] psig. End connections shall be
flanged. Each valve shall be provided with an electrically operated air
SECTION 15620A
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