as indicated.
2.11.2.2
Steam-Diffuser Type
Diffuser units shall be of a design that will separate any condensate from
steam supply and provide positive drain of condensate to waste and supply
dry steam only to air stream. Humidifiers may be installed on single or
multiple units. Materials shall be [noncorrosive materials] [Type 300
stainless steel].
2.11.3
Purge System
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NOTE: Refrigeration systems which operate below
atmospheric pressure (i.e., R-123 machines) will
require a refrigerant purge piping system. Indicate
the routing of purge piping on the drawings.
Require the Contractor to delete the piping if a
purge system is not required for the type of
refrigeration system that is to be provided.
Indicate that it will be the contractor's
responsible to size the piping based upon the
recommendations of the refrigeration system's
manufacturer. Purge discharge piping may be
connected to the pressure-relief piping on the
equipment side of the piping's vibration isolators.
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Refrigeration systems which operate at pressures below atmospheric pressure
shall be provided with a purge system. Purge systems shall automatically
remove air, water vapor, and non-condensible gases from the system's
refrigerant. Purge systems shall condense, separate, and return all
refrigerant back to the system. An oil separator shall be provided with
the purge system if required by the manufacturer. Purge system shall not
discharge to occupied areas, or create a potential hazard to personnel.
Purge system shall include a purge pressure gauge, number of starts
counter, and an elapsed time meter. Purge system shall include lights or
an alarm which indicate excessive purge or an abnormal air leakage into the
system.
2.11.4
Refrigerant Leak Detector
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NOTE: Refrigerant leak detectors will be provided
as required by the "System Application Requirements"
in ASHRAE 15.
When a detector is required, the location will be
indicated on the drawings. Detectors are best
located between the refrigeration system and the
room exhaust. Sampling points from a detector will
be located a maximum of 458 mm (18 inches) above the
finished floor since all commonly-used refrigerants
are heavier than air
As a rule of thumb, the distance between any
refrigeration system and a refrigerant sampling
point shouldn't exceed 15 m (50 feet). In order to
meet the recommended 15 m (50 foot) distance, a
SECTION 15700A
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