Bacharach MultiZone, Installation & Operation Manual, Page: 11 / 84

Multi-Zone Gas Monitors
P/N: 3015-5074 Rev 11 5
DO NOT block any of the zones. Unused zones may be disabled by setting the distance parameter to
zero feet in the zone setup screen.
The MZ monitor should be centrally located in the mechanical room and be readily accessible for easy
visual monitoring and servicing. The combined length of sample tubing plus exhaust tubing should not
exceed 1200 ft (366 m) for any zone. The fresh air purge line should draw from an area that does not
contain any gas. The exhaust line should run to an outside location if possible.
NOTE: The combined length of the purge line and the exhaust line cannot exceed
500 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
provides the pattern of air currents present in the mechanical room.
The MZ monitor should be kept dry. When used in a wet or humid area, it is highly recommended to use
the optional water stop accessory to avoid internal damage.
1.5.6. Locating a Remote Display (Optional)
The Remote Display (RD) Module should be mounted outside of the mechanical room, or just inside the
room’s doorway if the first option isn’t possible. This is the “split architecture design” for safety of the
operator. The RD can be located up to 4500 feet (1372 m) from the MZ monitor. The RD is the man
machine interface by which you program the MZ, acknowledge alarms and observe conditions inside of the
mechanical room. Note that there are two additional alarm relay contacts in the RD that can be
programmed to alarm on leak, spill, evacuate, fault, or monitor on conditions.
Figure 1-2. HGM-MZ (Halogen) and RD Placement in a Mechanical Room