Bacharach HGM-MZ User manual

Revision 2-1 -P/N: 3015-9003
Instruction: H3015-9003
Rev:
Date:
2
March 2023
HGM-MZ
Refrigerant Monitor
Quick Start Installation Instructions
1. VISUAL INSPECTION: Upon
opening the box visually inspect
exterior of monitor for damage
and unpack the provided Charcoal
filter and line end filters.
Figure 1.Refrigerant Leak Monitor Outside View
2. PLACEMENT OF MOUNTING HOLES: Using the supplied template, mark mounting hole locations. Then
drill holes in the wall for installing the monitor to the wall. DO NOT DRILL THROUGH THE MONITOR as this
will void the warranty.
3. ATTACH TO WALL: Fasten the monitor to the wall securely with appropriate fasteners.
4. REMOVE SHIPPING TIES:Cut the zip ties off the pump inside the monitor. They are only used for shipping
and will cause noise and vibration if left in place.
5. INTERNAL WIRING: With main power off make all internal wiring terminations and connections.
6. RUN SAMPLE TUBING: Locate the positions of remote air sample points and run air sample tubing back to
the monitor making note of the length of the tubing and the sample point location. NOTE: It is a good idea
to make a list of the sample point locations and leave it with the monitor for future reference.
7. PICKUP PLACEMENT AND PROTECTION: Sample point placement is critical for detecting leaks.They
should be located with respect to air currents and proximity to the most likely leak locations.
a. Mount pickup line end filters 6 to 12 inches off the floor for refrigerants.
b. CO2installations should be mounted 4 to 6 feet off the floor.
WARNING!
This Quick Start Instruction is not a replacement
for the User Instructions. Read the User
Instructions (P/N: H3015-5074) before using this
device, including all Cautions and Warnings.
Scan the QR code, visit the website or contact
Customer Service to obtain a hard copy.
Failure to follow this warning can result in
serious personal injury or death.

HGM-MZ Refrigerant Monitor Quick Start Installation Instructions
Revision 2-2 -P/N: 3015-9003
c. If you are placing pickups in a freezer, mount them well away from the door to prevent sensor
freeze up from high humidity near the freezer door. An alternative location is just outside the door
which would pick up refrigerant when the door is opened.
NOTE: Use the worksheet supplied with the monitor to document location and lengths of tubing for later
zone setup information.
Protect tubing in high traffic areas using conduit and junction boxes. In wet or potential wash down
locations you should use the wet location filter kit p/n 3015-5748. (See end of line Best Practices Below).
Figure 2. Best Practices: End of
Line Filter for Dry Locations
Figure 3. Best Practices: End of Line Filter for Wet Locations
(Splash Guard Accessory Part Number 3015-5748)
8. CONNECT TUBING: Connect tubing to the monitor using best practices for cutting and coupling air sample
tubing (see figures 4 and 5). PTC (push-to-connect) connectors are highly recommended for tubing
connections. In addition, ensure that all tubing cuts are “squared” (perpendicular to the tubing) to avoid
sharp angles that could damage O-rings.
Figure 4. Tubing Connections (Best through Worst) Figure 5. Best Practices: Tubing Cuts
9. MOUNT THE PURGE FILTER: Mount the charcoal purge filter using the supplied bracket. Be sure to mount
the filter near the monitor so that it is accessible when filter replacement is required.
10. CONNECT FILTER’S “FLOW OUT” SIDE: Use appropriate tubing to connect the “OUT” side of the charcoal
filter to the “PURGE port” on the monitor.

HGM-MZ Refrigerant Monitor Quick Start Installation Instructions
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11. CONNECT FILTER’S “FLOW IN” SIDE: Run tubing from the “IN side” of the charcoal filter to a location that is
outside of the structure (machinery room). Locate it in an area where the line end filter (a) can be easily
accessed for replacement, and (b) where it will remain dry and free from direct rain or excessive moisture.
This is the optimum installation scenario. See Figure 6.
If this cannot be accomplished, the end of line filter can be mounted inside (near the monitor and charcoal
filter) in an accessible area to allow easy replacement. NOTE: In the case of indoor filter installation, the
monitor must be put in service mode when refrigerant is released (e.g., during maintenance) to prevent
premature purge filter contamination. See Figure 7.
Figure 6. Outdoor Filter Mounting Example (Optimum) Figure 7. Indoor Filter Mounting Example
NOTE:
a. If you are mounting the purge pickup outside the structure, you must place the tubing in an area
away from the elements in a “secure area that is out of the reach of rain and snow” and is
accessible for filter changes.
b. In the case of the CO2monitor, you must mount the pickup away from CO2sources (i.e., gas-fired
appliance stacks, rack room, store ventilation, truck bays, etc.) which can skew the purge baseline.
c. If mounting a purge pick up inside the structure, you must not have prolonged background ambient
refrigerant contamination as this will cause the charcoal purge filter to fail prematurely (refer to
fault code 0100).

HGM-MZ Refrigerant Monitor Quick Start Installation Instructions
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Figure 8. Chiller Installation Example
Figure 9. Typical Refrigeration Rack Installation

HGM-MZ Refrigerant Monitor Quick Start Installation Instructions
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Figure 10. Example Grocery Store Installation
12. SUPPLY POWER. Apply power to the monitor. It is universal voltage and accepts 100 to 240 volts AC.
13. CONFIGURE ZONES: Set up all zones based on your application needs. Use the guidelines on the following
pages to set zone names, the number of zones, refrigerant type, alarm limits, and sample lengths for each
zone.If splitters are used on one or more zones:
a. Be sure to keep tubing lengths the same beyond the splitter.
b. DISTANCE (total) for a particular zone using a splitter should equal the tubing length up to the
splitter plus the length of any ONE of the split tubing trunks (not the sum of all split trunks).
c. Note that a leak reading from a zone with split trunks may be lower than a reading from a non-split
trunk due to possible dilution from other pickups (splits) on that trunk. Alarm levels should be
adjusted accordingly.

HGM-MZ Refrigerant Monitor Quick Start Installation Instructions
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Figure 11. Configuring the Number of Installed Zones
Figure 12. Accessing the Zone Setup Screen

HGM-MZ Refrigerant Monitor Quick Start Installation Instructions
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Best Practice Tip: Press the right arrow button (→) twice to move to the next zone.
Figure 13. Zone Setup Directions
Figure 14. Splitter Example Illustrating Proper Tubing Length Practices for 2-Way and 3-Way Splitters
Figure 15. Disabling One or More Zones

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)asaninexpensive test gas. Virtually any brand of
keyboard cleaner or “canned air” (readily available atmost computer and variety stores) contains
this refrigerant and issufficient toperform abump test.
b. Power up the HGM-MZmonitor. The green LED on the monitor will blink until the warmup cycle is
complete.
c. Locate and identify the zone tobechecked.
d. Either put the target zone onhold for continuous operation, or wait until the monitor is polling that
specific zone.
e. Have someone view the information atthe monitor for the zone tobe tested, and at the same time
have a technician dispense the bump gas. The technician should release a 2-second burst ofgas
directed atthe test zone pickup while the monitor is polling that zone.
f. After a short delay, the monitor will indicate the presence ofgas on that zone. The PPM reading will
vary as this is not a regulated gas application.
g. If norefrigerant isdetected by the monitor, the tubing needs tobeinspected 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) inaddition tonorefrigerant being detected for that zone.
15. FINAL CHECK: Take the monitor in and out ofservice 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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