Specifications

M GD-100 M anual
16 6109-9000 Rev 3
Otherwise, a gas leak might pass by i n a high-speed j et and not
be det ected by the sensor.
• Make sure that pits, stairwells and trenches are monitored since
they may fill with stagnant pockets of gas.
• If a pressure reli ef vent (PRV ) pipe is fitted to the system, it may
be a requirement to mount a sensor to monitor this vent pipe. It
could be positioned about 6.5 ft (2 m) above the PRV to allow
gas clouds to form.
• For racks or chillers pre-fitted with refrigerant sensors, these
should be mounted so as to monitor the compressors. If extract
ducts are fitted the airflow in the duct may be monitored.
2.4. Refrigerated Spaces
In refrigerated spaces, sensors should be located in the return airflow to
the evaporators on a sidewall (below head-high is preferred), or on the
ceiling, not directly in front of an evaporator. In large rooms with m ultiple
evaporators, sensors shoul d be mounted on the central line between 2
adjacent evaporators, as turbulence will result in airflows mixing.
2.5. Chillers
In the c ase of small water- or air-cooled enclosed c hiller units mount the
sensor so as to monitor airfl ow to the extract fans. With larger models
also place a sensor inside the enclosure under or adj acent to the
compressors.
In the case of outdoor units:
• For enclosed air-cooled chillers or the outdoor unit for
variable refrigerant volume and variable refrigerant flow
(VRV/VRF) systems, mount the sensor so as to monitor airflow
to the extractor/exhaust fan. With large units also place a sensor
inside the enclosure under or adjacent to the com pressors.
In the case of non-enclosed out door units:
• If there is an enclosed machinery section, locate a sensor there.
• In the case of units with enclos ed com pressors, mount sensors
in the enclosures.
• Where you have protective or acoustic panels mount the sensor
low and under the compressors where it is protected by the
panels.