2-3
4.
Do not mount unit where it will be exposed to direct solar heating.
5.
For proper cooling, allow at least three inches (7.6 cm) clearance
around all surfaces except for the mounting surface.
6.
Mount the unit so the front panel is easily seen and accessed for
service and calibration.
Guidelines for Locating the Sampling Point(s)
Due to the wide variation in equipment room layouts, each situation
must be analyzed individually. A sampling point may be remotely
located up to 150 feet (46 m) from the monitor (500 feet [152 m] if
0.180" (4.6 mm) I.D. tubing is used) in an area where refrigerant
vapors are most likely to leak or accumulate (FIGURE 2-2).
NOTE: The 150 and 500 feet (46 and 152 m) allowances refer to the
total sample and exhaust line length for each sample point.
Equipment Configuration
The equipment arrangement in the room can also have an impact on
the most effective place to sample. As a general guideline:
• If there is one chiller in the room, sample at the perimeter of unit.
• For two chillers, sample between them.
• With three or more chillers, multiple monitors or a single monitor
with a multi-point sampling system should be used. Airflow patterns
must always be considered.
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