Specifications

Multi-Zone Gas Monitors

P/N: 3015-5074 Rev 10 5

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 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. MZ/RD Gas Leak Monitor Placement in a Mechanical Room

NOTE: The pickup points located on the floor in the above illustration are examples for

refrigerants which are heavier than air. Placement of pickup points should be determined

based on characteristics of the gas being monitored and ambient conditions of the sampling

area. (Air=28.9 g/mole, CO

=44.0 g/mole, NH

=17.0 g/mole, and halogens = 100+ g/mole.)