HGM-MZ Refrigerant Monitor
Quick Start Installation Instructions
Revision
2
- 8 -
P/N: 3015-9003
NOTE: To place a zone on hold for testing, start at the Normal Operating Screen. Using the
arrow key, move the cursor to the right to cover the list of zones. Then, using the up and
down arrow keys, select the zone to be put in hold mode. When you have the cursor on
the target zone, press enter until you hear a beep (about 1 second). The zone will remain
on hold for 15 minutes or until you release it using the selection method above to release.
14.
PERFORM BUMP TESTS: Gas test (or “bump test”) each zone using the bump gas method described below
to ensure that the monitor is operating properly, the alarms operate, and that each zone’s gas path is clear.
a.
This procedure uses “bump gas” (
Difluoroethane
) as an inexpensive test gas. Virtually any brand of
keyboard cleaner or “canned air” (readily available at most computer and variety stores) contains
this refrigerant and is sufficient to perform a bump test.
b.
Power up the HGM-MZ monitor. The green LED on the monitor will blink until the warmup cycle is
complete.
c.
Locate and identify the zone to be checked.
d.
Either put the target zone on hold for continuous operation, or wait until the monitor is polling that
specific zone.
e.
Have someone view the information at the monitor for the zone to be tested, and at the same time
have a technician dispense the bump gas. The technician should release a 2-second burst of gas
directed at the test zone pickup while the monitor is polling that zone.
f.
After a short delay, the monitor will indicate the presence of gas on that zone. The PPM reading
will
vary as this is not a regulated gas application.
g.
If no refrigerant is detected by the monitor, the tubing needs to be inspected for an open or
blocked
pathway. If the tubing was pinched or plugged, the monitor will show a flow fault
(indicating a flow-related problem) in addition to no refrigerant being detected for that zone.
15.
FINAL CHECK: Take the monitor in and out of service mode. This will cause a purge and pressure check. It
will also allow the monitor to cycle through all zones for a final check.
16.
SAMPLE SCREEN: Finish by putting the monitor into service by returning the display to the sampling screen.
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-mail: help@MyBacharach.com
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