MGS-250 Manual
6490-9000 Revision 4
19
any direct airflow. In large rooms with multiple evaporators, gas detectors
should be mounted on the central line between 2 adjacent evaporators,
as turbulence will result in airflows mixing.
2.2.4. Chillers
In the case of small water- or air-cooled enclosed chiller units mount the
gas detector so as to monitor airflow to the extract fans. With larger
models also place a gas detector inside the enclosure under or adjacent
to the compressors.
For enclosed air-cooled chillers or the outdoor unit for
variable refrigerant volume and variable refrigerant flow (VRV/VRF)
systems, mount the gas detector so as to monitor airflow to the extract
fan. With large units also place a gas detector inside the enclosure
under or adjacent to the compressors.
2.3. Mounting Procedure
To open the housing as received use a flat blade screwdriver and
depress the top latch. While pushing the latch grasp the back edge of the
housing near the latch and pull the back away.
When mounted, the housing is simply opened by pressing the top latch
with a suitable screwdriver or other flat blade. With the top latch
depressed pull the housing apart by grasping the sides and pulling
straight out. With the housing separated the mounting base with terminal
blocks will be visible. See Figure 5.
IMPORTANT:
Do not apply caulking or other material around
the gas detector base. The gas detector relies on air
exchange through the spaces between the base and the gas
detector housing. Do not obstruct the small gap around the
housing and the base with any material.
Step
Mounting Procedure
1
Open the housing (see Figure 5).
2
Position the base to the pre-determined (acceptable) mounting
location. Use the gas detector base to mark the mounting
locations as needed. The hole pattern on the back plate is
sized to mount the gas detector onto various electrical junction
boxes. The other holes may be used as needed to mount the
gas detector to other structures, or onto a wall.
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