8
sample pick-up-point, no exhaust
tube is required.
Caution: Liquid can affect
the performance of the
monitor.
Pick-up-points
must be protected from
exposure to water and other
liquids.
Sample Location:
Since the
monitor measures the concentration
of refrigerant in the air, the pick up
point should be mounted where it is
most
likely
to
sense
leaking
refrigerant. The criteria to consider
in selecting the sample pick up point
location include:
1. As close to the area of
potential leaks as possible.
On the ‘downstream’ side of
the air flow pattern in the
room.
2. Since
refrigerants
are
typically heavier than air, the
pick up tube should be
terminated approximately 18
inches above the floor.
3. The sample tube should be
located such that it will
require no more than 250 feet
(75 m) of tubing.
Reference Location:
Since the
monitor compares a fresh air
reference to the sample, care must
be taken in choosing a location. The
fresh air reference tube should be
routed to a location that will be free
of refrigerant. This can be, but does
not necessarily have to be, located
outdoors. If the fresh air reference is
routed outdoors, the following criteria
should be used:
1. The tube end filter must be
protected from the elements.
Water, ice or insects can
partially obstruct the tube end
filter
and
change
the
reference signal.
2. The tube end filter must be
located such that it can be
inspected as part of the
recommended
quarterly
preventive maintenance.
3. The tube end filters must not
be located near exterior
HVAC equipment, or any
potential
source
of
refrigerant.
Exhaust Location:
The exhaust
tube is required only if the monitor is
not located in the same room as the
sample pick-up-point. If an exhaust
tube is installed, it should be run to
the room being monitored, or to an
exterior location. An exhaust tube
must not be terminated near the
fresh air reference.
Alarm Location(s):
A combination
horn/strobe alarm is recommended
for a mechanical room. The alarm
should be located inside the room
such that it can be seen and heard
from any area of the room.
Additionally, a strobe alarm can be
installed at each entrance to the
room to alert the user of an alarm
prior to entry to the room itself. Note
that the IR-SNIF-1,2,3 has visual
indicators of its alarm status. If the
monitor is installed at the entrance to
the room, a strobe should not also
be required.
Содержание IR-SNIF-1
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