13
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. When routing the fresh air
reference, the following criteria should be
used:
1. Since refrigerants are typically
heavier than air, the fresh air
reference should be terminated
above any possible source of
refrigerant.
2. The tube end filter must be located
such that it can be inspected as part
of the recommended quarterly
preventive maintenance.
3. If located indoors, the fresh air
reference should be located in an
area free of refrigerants, and
located approximately 18 inches
from the ceiling.
4. If located outdoors, 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.
5. If located outdoors, 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-MCD 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.
Electrical Power Connection
Caution: All installation wiring,
service and maintenance should
be performed by a qualified
electrician in accordance with
national and local codes.
TB-1 Power Wiring:
The IR-SNIF-MCD
monitor is designed to operate on only 110
vac or 240 vac, but not both. It will operate
on either 50 or 60 hz. The power supply in
the monitor automatically detects the supply
voltage. The diaphragm pump is designed
to operate only on 110-120 vac or on 220-
Summary of Contents for IR-SNIF-MC-1
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