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Bacharach HGM-MZ Installation Manual

Bacharach communications adapter
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621 Hunt Valley Circle
New Kensington, PA 15068
Tel:
724-334-5000
Fax:
724-334-5001
1.
Introduction
The Bacharach HGM-MZ to Johnson Metasys N2 Communications Adapter enables an HGM-MZ Refrigerant
Monitor to communicate with a Metasys building management system. The following may be viewed on
Metasys operator stations.
• Zone PPM readings
• Flow status
• Refrigerant selections
• HGM internal health.
In addition, each HGM zone supports three levels of alarming through Metasys.
• Leak
• Spill
• Evacuate
Each alarm threshold can be set through Metasys.
The N2 Communications Adapter can be used in conjunction with the MZ-RD Remote Display if desired.
Wiring details and operational limitations when using the MZ-RD are discussed below.
CAUTION: The adapter is powered from the 120/240V Universal Power Supply connection on
the HGM main board. 120/240V is present on the lower left corner of this adapter within the
area shown on the board silkscreen. Keep fingers away from this area when HGM is powered.
2.
Adapter Installation Inside HGM-MZ
The communications adapter board will normally be installed in the HGM-MZ at the factory. It can, however,
be field installed by following the instructions below.
The following installation materials are needed for field installation of the adapter:
• Qty (5)
Rev 1 (P/N 3015-5514)
6-32 x ¼" screws (standard finish)
Bacharach Communications Adapter
HGM-MZ to Johnson Controls' Metasys N2 Network
(Electrically Isolated N2 Port Version)
Installation Guide
Instruction 3015-5514
Revision 1
October 2012
1

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Summary of Contents for Bacharach HGM-MZ

  • Page 1 Keep fingers away from this area when HGM is powered. Adapter Installation Inside HGM-MZ The communications adapter board will normally be installed in the HGM-MZ at the factory. It can, however, be field installed by following the instructions below.
  • Page 2 If an MZ-RD remote display IS to be used with the adapter, refer to Figure 2 for wiring details. Note that when the MZ-RD is used, TWO RS-485 cables must be run between the HGM-MZ and MZ-RD, so plan accordingly.
  • Page 3 Figure 2 – HGM-MZ to N2 Communications Adapter: Wiring w/Remote Display Field Hookup of N2 Communications The “BAS BUS” (N2) RS-485 communications port on the adapter is electrically isolated from the HGM-MZ and from earth ground. This prevents problems with potential differences in “ground” between physically separate locations.
  • Page 4 HGM’s address DIP switch (on the HGM main board). Values from 0-15 are possible. Refer to the table that follows. Figure 3 – HGM-MZ to N2 Communications Adapter: DIP Switches Rev 1 (P/N 3015-5514)
  • Page 5 HGM for refrigerant type and length of tubing for each zone (zero length to disable a zone) must be done with the MZ-RD remote display or a laptop PC. Refer to the appropriate Bacharach instructions for configuring these items. HGM’s are commonly custom-configured at the factory per the customer’s needs, so field configuring these parameters may not be necessary.
  • Page 6 HGM-MZ to N2 Communications Adapter Setting the Metasys N2 Address on the Communications Adapter Board Switches 1-8 on the adapter’s ‘B’ DIP switch are used to set the Metasys N2 node address. Possible addresses are 1-255. Use the following technique to set switches B1-B8.
  • Page 7 BI (binary input), and ADI (internal integer) points in the Metasys database. Additional comments are provided below to supplement the map. The HGM-MZ can support up to 16 zones in groups of 4 zones, but a particular HGM-MZ may not have all zones installed. It is not necessary to include points in the Metasys database for zones that are not installed in the HGM-MZ.
  • Page 8 15 seconds or so, the adapter polls the HGM at a slow rate to reduce the communications burden on the HGM main processor. Figure 4 – HGM-MZ to Metasys N2 Adapter: Communications LEDs Rev 1 (P/N 3015-5514)

  • Page 9: Miscellaneous Notes

    10. Operating Limitations When Using MZ-RD Remote Display When an MZ-RD remote display is used, the N2 network will have access to the HGM-MZ as long as the MZ- RD is in either the SYSTEM or ZONE VIEW screen. If the MZ-RD is set to display any other screen, it will respond to polls from the N2 adapter with an HGM BUSY exception code.
  • Page 10 HGM-MZ to N2 Communications Adapter Headquarters: 621 Hunt Valley Circle, New Kensington, PA 15068-7074 Toll Free: 1-800-736-4666 • Tel: +1-724-334-5000 • Fax: +1-724-334-5001 Website: www.MyBacharach.com • E-mail: help@MyBacharach.com Printed in U.S.A. ® Registered Trademark of Bacharach Inc. Rev 1 (P/N 3015-5514)