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SECTION 2
HGM300 / RDM800 Refrigerant Gas Leak Monitor
Mechanical Room Placement
The HGM300 should be centrally located in the mechanical room and be readily accessible for easy
visual monitoring and servicing. Air sample tubing may be run in lengths up to 500 feet.
The fresh air purge line should draw from an area that does not contain any refrigerant gas and
cannot exceed 300 feet in length. The exhaust line should run to an outside location if possible.
The length of the exhaust line cannot exceed 300 feet.
Ideally, two to three pick up points spaced around each chiller will provide sufficient coverage. It may be
necessary to perform a “smoke” test of the mechanical room to determine the best locations. The smoke
test would provide the pattern of air currents present in the mechanical room.
Sample Inlet Pickup Points
Chiller
HGM300
Halogen
Gas
Monitor
RDM800
Remote Display
Module outside of
mechanical room
Outside Hallway
Machine Room
Exhaust Fan
Sample Inlet
Pickup Point
Aux. Horn/Strobe
Remote Alarm
Fresh air purge
from area away
from refrigerant
gas
The RDM800 should be mounted outside of the mechanical room, or at least just inside of a door to the
room. This is the “split architecture design” for safety of the operator. The RDM800 can be located up to
4500 feet from the HGM300. The RDM800 is the man-machine interface by which you program the
HGM300, acknowledge alarms, and observe conditions inside of the mechanical room. Note that there
are two additional alarm relay contacts in the RDM800 that can be programmed to alarm with leak, spill,
evacuate, fault, or monitor on.
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