Bacharach MZ-RD User manual

MZ-RD
Remote Display
Instruction 3015-5157
Installation / Operation / Maintenance
Rev. 6 – December 2011
UL 61010-1
CAN/CSA 22.2 No.61010.1
Product Leadership • Training • Service • Reliability

MZ-RD – Multi-Zone Remote Display
ii Instruction 3015-5157
NOTICE
Product improvements and enhancements are continuous; therefore the specifications and information contained in
this document may change without notice.
Bacharach, Inc. shall not be liable for errors contained herein or for incidental or consequential damages in
connection with the furnishing, performance, or use of this material.
No part of this document may be photocopied, reproduced, or translated to another language without the prior written
consent of Bacharach, Inc.
Copyright © 2000–2011, Bacharach, Inc., All Rights Reserved
BACHARACH®is a registered trademark of Bacharach, Inc. All other trademarks, trade names,
service marks and logos referenced herein belong to their respective owners.
WARRANTY
Bacharach, Inc. warrants to Buyer that at the time of delivery this Product will be free from defects in material and
manufacture and will conform substantially to Bacharach Inc.'s applicable specifications. Bacharach's liability and
Buyer's remedy under this warranty are limited to the repair or replacement, at Bacharach's option, of this Product or
parts thereof returned to Seller at the factory of manufacture and shown to Bacharach Inc.'s reasonable satisfaction
to have been defective; provided that written notice of the defect shall have been given by Buyer to Bacharach Inc.
within two (2) years after the date of delivery of this Product by Bacharach, Inc.
Bacharach, Inc. warrants to Buyer that it will convey good title to this Product. Bacharach's liability and Buyer's
remedy under this warranty of title are limited to the removal of any title defects or, at the election of Bacharach, to
the replacement of this Product or parts thereof that are defective in title.
The warranty set forth in Paragraph 1 does not apply to parts the Operating Instructions designate as having a limited
shelf-life or as being expended in normal use (e.g., filters).
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN LIEU OF (I) ANY AND
ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE: AND (II) ANY OBLIGA-
TION, LIABILITY, RIGHT, CLAIM OR REMEDY IN CONTRACT OR TORT, WHETHER OR NOT ARISING FROM
BACHARACH'S NEGLIGENCE, ACTUAL OR IMPLIED. The remedies of the Buyer shall be limited to those provided
herein to the exclusion of any and all other remedies including, without limitation incidental or consequential
damages. No agreement varying or extending the foregoing warranties, remedies or this limitation will be binding
upon Bacharach, Inc. unless in writing, signed by a duly authorized officer of Bacharach.
Register your warranty by visiting
www.mybacharach.com

MZ-RD – Multi-Zone Remote Display
Instruction 3015-5157 iii
Table of Contents
Chapter 1. Introduction ............................................................................................................. 1
1.1. How to Use This Manual .................................................................................................................. 1
1.2. 1
Warnings and Caution Labels .................................................................................................................... 1
Hazard Symbols on the Monitor ....................................................... Error! Bookmark not defined.
1.3. Safety Precautions ........................................................................................................................... 1
Altitude Limit .................................................................................... Error! Bookmark not defined.
1.4. 2
Communications Options .......................................................................................................................... 2
Chapter 2.......................................................................................................................................... 3
Installation ....................................................................................................................................... 3
2.1. Warnings and Cautions.................................................................................................................... 3
2.2. Preliminary Inspection ..................................................................................................................... 3
2.3. Location of the Remote Display....................................................................................................... 3
2.4. Mounting Instructions ..................................................................................................................... 4
2.5. Interior Components........................................................................................................................ 6
2.6. Electrical Wiring ............................................................................................................................... 7
2.7. Communications Connections ......................................................................................................... 8
2.7.1 MZ-RD Network .................................................................................................................. 8
2.7.2 Integration with Building Management System ................................................................. 8
2.8. 9
Connecting External Alarms....................................................................................................................... 9
2.8.1 Overview............................................................................................................................. 9
2.8.2 Connection.......................................................................................................................... 9
Chapter 3. Overview ................................................................................................................ 10
3.1. General........................................................................................................................................... 10
3.2. System Programming..................................................................................................................... 11
3.2.1. Setup Parameters ............................................................................................................. 11
3.2.2. Password Protection......................................................................................................... 11
3.3. Setup Programming ....................................................................................................................... 12
3.3.1. Setting the Clock ............................................................................................................... 12
3.3.2. Navigating to the 1st MZ-RD Setup Screen........................................................................ 12
3.3.3. Num Monitors on Net....................................................................................................... 13
3.3.4. Monitor Baud.................................................................................................................... 13
3.3.5. Audible Alarm ................................................................................................................... 13
3.3.6. BMS................................................................................................................................... 14
3.3.7. BMS Baud Rate ................................................................................................................. 14
3.3.8. Password........................................................................................................................... 14

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iv Instruction 3015-5157
3.3.9. Navigating to the 2nd MZ-RD Setup Screen....................................................................... 14
3.3.10. Setting Relay Parameters.................................................................................................. 14
3.3.11. Node Address.................................................................................................................... 14
3.3.12. Navigating to the 1st and then 2nd Monitor Setup Screen.............................................. 15
3.3.13. Navigating to the 3rd Monitor Setup Screen ..................................................................... 16
3.4. Zone Setup Programming .............................................................................................................. 17
3.4.1. Navigating to the 1st Zone Setup Screen............................................................................. 17
3.4.2. Navigating to the 2nd Zone Setup Screen ............................................................................ 18
3.4.3. Navigating to the Trend Screen .......................................................................................... 18
Chapter 4. General Operation .................................................................................................. 20
4.1. Functional Overview ...................................................................................................................... 20
4.2. The Zone Screen............................................................................................................................. 20
4.3. 21
Alarm Conditions ..................................................................................................................................... 21
4.4. Fault Conditions ............................................................................................................................. 21
4.5. The System Screen......................................................................................................................... 22
4.5.1. Alarm Conditions................................................................................................................. 22
4.5.2. 23
Alarm Log ....................................................................................................................................... 23
4.5.3. Fault Conditions .................................................................................................................. 24
4.6. Alarms ............................................................................................................................................ 25
4.6.1. Functional Overview ........................................................................................................... 25
4.6.2. Responding to Alarms ......................................................................................................... 25
4.6.3. Alarm Detail Screen............................................................................................................. 26
4.6.4. Acknowledging Alarms........................................................................................................ 26
4.7. The Trend Screen ........................................................................................................................... 27
4.7.1. Overview - Log Interval ....................................................................................................... 27
4.7.2. Navigating to the Trend Screen .......................................................................................... 27
4.8. System Faults ................................................................................................................................. 28
4.8.1. Functional Overview ........................................................................................................... 28
4.8.2. Navigating to the Fault Screen............................................................................................ 29
4.8.3. Critical Faults....................................................................................................................... 29
4.8.4. Non Critical Faults ............................................................................................................... 30
4.8.5. Reset to Factory Default Settings........................................................................................ 30
4.8.6. Clearing System Faults ........................................................................................................ 31
4.8.7. Viewing Fault Log ................................................................................................................ 31
4.9. The Calibration Screen................................................................................................................... 32
4.9.1. Overview ............................................................................................................................. 32
4.9.2. Navigating to the Calibration Screen .................................................................................. 32
4.9.3. Adjusting Calibration Factor................................................................................................ 33
4.10. The Diagnostic Screen.................................................................................................................... 33

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Instruction 3015-5157 v
4.10.1. Overview ........................................................................................................................... 33
4.10.2. Navigating to the Diagnostic Screen ................................................................................. 33
4.10.3. Diagnostic Screen Overview.............................................................................................. 34
4.11. 35
Service Mode ........................................................................................................................................... 35
Appendix A. Logic Diagram ............................................................................................................. 38
Appendix B. Specifications ............................................................................................................. 40
Appendix C. Agency Approvals ....................................................................................................... 42
Appendix D. Service Centers........................................................................................................... 44

MZ-RD – Multi-Zone Remote Display
vi Instruction 3015-5157

MZ-RD – Multi-Zone Remote Display
Instruction 3015-5157 1
CHAPTER 1. INTRODUCTION
1.1. How to Use This Manual
Thank you for investing in a Bacharach MZ-RD Remote Display. To assure operator safety and the proper
use of the MZ-RD please read, understand, and follow the contents of this manual, which provides
important information on the installation, operation, and maintenance of the monitor.
If you have a working knowledge of refrigerant monitors, you will find this manual useful as a reference
tool. If you are new to the use of refrigerant monitors, you can educate yourself about the principles of
refrigerant gas detection and the proper operation of this device by reading this manual thoroughly. This
manual provides important information on how to install, operate, and service the Remote Display.
1.2. Warnings and Caution Labels
When used in this manual or as labeled on the MZ-RD, the following hazard symbols and/or associated
words are defined as follows.
WARNING: This symbol and/or the use of the word WARNING indicates a potential
hazard associated with the use of this equipment. It calls attention to a procedure,
practice, condition, or the like, which if not correctly performed or adhered to, could
result in death or serious injury.
WARNING: This symbol and/or the use of the word WARNING indicates a potential
hazard from electrical shock. It calls attention to a procedure, practice, condition, or the
like, which if not correctly performed or adhered to, could result in death or serious
injury.
CAUTION: This symbol and/or the use of the word CAUTION indicates a potential hazard
associated with the use of this equipment. It calls attention to a procedure, practice,
condition, or the like, which if not correctly performed or adhered to, could result in
minor or moderate injury.
IMPORTANT: The use of the word IMPORTANT in this manual calls attention to a
procedure, practice, condition, or the like, which if not correctly performed or adhered to,
could result in incorrect performance of or damage to the equipment and may void the
warranty.
1.3. Safety Precautions

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2 Instruction 3015-5157
WARNING: This instrument has not been designed to be intrinsically safe for use in areas
classified as hazardous locations. For your safety, DO NOT use it in hazardous (classified)
locations.
WARNING: Under no circumstances should the MZ-RD be operated without connection
to a protective ground. Doing so poses a potential shock hazard and is also a violation of
electrical safety standards applicable to this type of equipment.
WARNING: Do not operate this equipment in the presence of flammable liquids, vapors
or aerosols. Operation of any electrical instrument in such an environment constitutes a
safety hazard.
WARNING: Extreme care should be exercised when accessing the interior of the remote
display. Only qualified electrical maintenance personnel should perform connections and
adjustments. Always remove AC power before working inside the remote display’s
enclosure.
IMPORTANT: The protection provided by the remote display may be impaired if the
remote display is used in a manner not specified by Bacharach, Inc. Modifications to this
remote display, not expressly approved, will void the warranty.
IMPORTANT: In case of malfunction, do not continue to use this equipment if there are
any symptoms of malfunction or failure. In the case of such occurrence, de-energize the
power supply and contact a qualified repair technician or the nearest Bacharach Service
Center. Use ONLY the provided knockouts for electrical and communication wiring.
Drilling into the box will void the warranty.
WARNING: To clean the outside of the case use a DRY CLOTH. DO NOT use soap and
water.
IMPORTANT: This device is designed for operation at or below an altitude of 6,562 ft
(2,000 m). Do not operate this device above this altitude limit.
1.4. Communications Options
The MZ-RD features full two-way communications via an RS-485 interface. MODBUS RTU is the
communication protocol standard. The instrument (P/N 3015-5138) can be connected to a Building
Management System or it may be operated as a stand-alone system with Bacharach’s gas monitors.
Please refer to the Appendix for a more complete discussion of communication protocols.

MZ-RD – Multi-Zone Remote Display
Instruction 3015-5157 3
CHAPTER 2. INSTALLATION
2.1. Warnings and Cautions
WARNING: Explosion hazard! Do not mount the MZ-RD in an area that may contain
flammable liquids, vapors or aerosols. Operation of any electrical equipment in such an
environment constitutes a safety hazard.
WARNING: Electrical installation should be performed by a certified electrician, and
should comply with all applicable NEC/CEC and local electrical safety codes.
WARNING: The AC power ground wire must first be connected to the monitor’s ground
stud. Under no circumstances should this monitor be operated without a protective
ground. Doing so poses a potential shock hazard, and is also a violation of electrical safety
standards applicable to this type of equipment.
WARNING: Shock hazard! Always disconnect AC power before working inside the
monitor.
CAUTION: Drilling holes in the MZ-RD enclosure may damage the unit and will void the
warranty. Please use provided knockouts for electrical connections.
CAUTION: The MZ-RD contains sensitive electronic components that can be easily
damaged. Be careful not to touch or disturb any of these components.
2.2. Preliminary Inspection
The MZ-RD has been thoroughly inspected and tested prior to shipment from the factory. Nevertheless,
it is recommended that the instrument be re-checked prior to installation. Inspect the outside of the
enclosure to make sure there are no obvious signs of shipping damage. Loosen the four screws on the
sides of the enclosure and remove the front panel. Visually inspect the interior of the display for loose
components that may have become dislodged during shipment. If damage is discovered, please contact
the nearest Bacharach Service Center for assistance.
2.3. Location of the Remote Display

MZ-RD – Multi-Zone Remote Display
4 Instruction 3015-5157
The MZ-RD should be centrally located in the facility (preferably outside of the mechanical room) and
should be easily accessible for visual monitoring and servicing. This is the “split architecture design” for
safety of the operator.
Dirt, grease, and oils can adversely affect the operation of the MZ-RD. The MZ-RD should be installed
out of direct sunlight in a clean, dry area that is not subject to temperature or humidity extremes.
Installation in a mechanical room is acceptable provided reasonable environmental conditions exist. If
there is a question, consider installing the unit outside of the mechanical room in a cleaner area of the
facility.
The MZ-RD can be located up to 4500 feet (1372 m) from the furthest gas monitor. The MZ-RD is the
main machine interface by which you can program the gas monitor, acknowledge alarms, and observe
conditions inside the mechanical room. Note that there are two additional alarm relay contacts in the
MZ-RD that can be programmed to alarm with “leak, spill, evacuate, fault or monitor on”.
2.4. Mounting Instructions
The MZ-RD should be installed plumb and level and securely fastened to a rigid mounting surface.
The enclosure utilizes
keyhole mounting
brackets designed for
¼ inch fasteners.
Locate the four
screws as shown in
the diagram below or
by using the provided
mounting template.
Allow the screw
heads to protrude
approximately 1/4"
(6 mm).
Hold the unit flat
against the mounting
surface and allow it
to slide down
engaging the screw
heads in the keyhole
slots of the mounting
brackets. Adjust the
screws as necessary
to hold the unit
MZ-RD Mounting Specs

MZ-RD – Multi-Zone Remote Display
Instruction 3015-5157 5
securely against the
mounting surface.

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6 Instruction 3015-5157
2.5. Interior Components

MZ-RD – Multi-Zone Remote Display
Instruction 3015-5157 7
2.6. Electrical Wiring
Locate a convenient service knockout and install electrical conduit in the typical manner.
Locate the AC Input Terminals and Ground Stud on the inside of the unit. Secure the incoming
AC power neutral (white/blue) and live (black/brown) wires to the LINE 1 and LINE 2 terminals.
Using the supplied crimp-on ring terminals, washers, and nuts, connect the incoming AC power
ground wire (green w/ yellow stripe) to the unit’s AC Input Ground Stud, and then install a
separate wire between the ground stud and the GND terminal.
WARNING: Electrical installation should be performed by a certified electrician, and
should comply with all applicable NEC/CEC and local electrical safety codes.
WARNING: Copper conductors for connection to supply mains must be made in
accordance with NEC/CEC and local codes.
WARNING: The AC power ground wire must first be connected to the unit’s ground stud.
Under no circumstances should this monitor be operated without a protective ground.
Doing so poses a potential shock hazard, and is also a violation of electrical safety
standards applicable to this type of equipment.
CAUTION: Drilling holes in the MZ-RD enclosure may damage the unit and will void the
warranty. Please use knockouts provided for electrical connections.
MZ-RD AC Input Power and Ground Connections
AC INPUT
GROUND WIRE
GROUND WIRE
TO ENCLOSURE DOOR
GREEN
GREEN W/ YELLOW STRIPE
Use supplied crimp-on
ring terminal, washers,
and nuts to connect AC
input ground wire to
Ground Stud as shown
to meet approval
agency requirements.
IMPORTANT!
AC input ground
wire must be
positioned on
bottom of Ground
Stud
GROUND STUD

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8 Instruction 3015-5157
A switch or circuit breaker rated 1.0 A, 250 VAC must be attached to the unit’s AC power leads.
This switch must also be located in close proximity to the monitor, and be in easy reach of the
operator. This switch should also be clearly marked as the monitor’s main AC disconnect
device.
2.7. Communications Connections
2.7.1 MZ-RD Network
The MZ-RD is connected to the gas monitor using a shielded twisted pair instrument cable. The
maximum distance between the furthest gas monitor and MZ-RD is 4500 feet (1372 m).
Use any of the remaining service knockouts to gain access to the interior of the unit. The RS-485
communication wiring between the gas monitor and MZ-RD must be connected in the following
manner:
1. Locate the RS-485 connector in the gas monitor (See appropriate gas monitor manual).
2. Connect one lead of a twisted shielded pair to the “B” connection point; note the wire
color.
3. Connect the second wire to the “A” connection point; note the wire color.
4. Connect the ground to the “GND” connection point
Locate the RS-485 connector marked “TO MONITORS” in the MZ-RD. This connector is located
on the bottom of the MZ-RD PC board, second from the right. Run the wire to the MZ-RD and
connect the twisted shielded pair to the RS-485 TO MONITORS connector using the same color
code as used on the gas monitor.
2.7.2 Integration with Building Management
System
A second RS-485 connector allows a Building
Management System to “talk” to the gas monitor
network through the MZ-RD. The connection is
established using a shielded twisted pair cable.
Use any of the remaining service knockouts to gain
access to the interior of the MZ-RD. Locate the RS-485
connector marked “TO HOST” and remove it from the
circuit board. Secure the wire leads to the connector in
the orientation as displayed on the board. Check to
make sure the polarity matches the wiring to the
Building Management System. When connections are
secured, carefully plug the connector back onto the
circuit board.
RS-485 to HOST Connector

MZ-RD – Multi-Zone Remote Display
Instruction 3015-5157 9
2.8. Connecting External Alarms
2.8.1 Overview
Two SPDT relays are available for the connection of external alarm devices. These alarms are
useful for alerting the user to global conditions anywhere on the network. Each relay can be
programmed to respond to alarm, fault, or ready conditions.
2.8.2 Connection
Use the AC conduit or any of the remaining service knockouts to gain access to the interior of the
MZ-RD. Locate the relay connectors and remove them from the circuit board. Secure the wire
leads to the connectors orienting them as shown in the diagram below. After connections are
secured, carefully plug the connectors back onto the circuit board.
MZ-RD Relay Connector
NOTE: Each relay can be connected as normally open (NO), or normally closed (NC).
NOTE: Power for the external alarms can be tapped off the AC IN connector.
NOTE: The relay contacts are rated 2A at 250VAC (inductive) and 5A at 250VAC
(resistive).

MZ-RD – Multi-Zone Remote Display
10 Instruction 3015-5157
CHAPTER 3. OVERVIEW
3.1. General
The MZ-RD displays comprehensive information about the gas monitor network status and
enables complete programming control of all system operations.
When first powered up, a splash screen appears indicating the firmware revision number. After a
brief moment the System Screen is displayed.
After the System screen is displayed, press the ENTER key.
The Monitor 1 location block on the screen will highlight and
begin to flash.
With Monitor 1 selected,
1. Press ENTER to access other screens that contain
information and setup criteria for Monitor 1.
2. Use the Arrow keys to make data entry selections on each
screen.
3. Press the ENTER key to accept the entries or use ESC to
cancel and return to the previous screen.
4. When programming is completed, use the ESC key to return to the System screen.
To access Monitors 2, 3 or 4, use the down Arrow key. Access information for these monitors in
the same manner as described above for Monitor 1.
The System Screen
LOCATION
ZONE 01 LOC

MZ-RD – Multi-Zone Remote Display
Instruction 3015-5157 11
In like fashion, use the Arrow keys to navigate through the screens and the ENTER key to make
selections for ALARMS, FAULTS, ZONES, the date/time or MZ-RD SETUP.
Some of the screens you will access will require data entry, such as the date/time setup. These
screens will appear with a character selected, as displayed below. Use the up/down Arrow keys
to scroll through the characters provided for that character’s place. Use the left/right Arrow keys to
move the cursor on the text line. When all character selections for the screen are completed,
press ENTER to accept the entries.
3.2. System Programming
3.2.1. Setup Parameters
Before working with the gas monitor network, several global parameters must be defined. Most of
these are entered in the MZ-RD Setup Screens or via the PC software. Parameters must also
be defined for each gas monitor connected to the network. These settings serve to identify each
monitor and define how they operate. These are entered in the Setup Screens. Finally,
parameters must be defined for each individual monitoring zone. These are entered in the Zone
Setup Screens.
3.2.2. Password Protection
The MZ-RD can be password protected to prevent the unauthorized editing of setup parameters.
When password protection is enabled, an operator may still navigate between screens to observe
settings or monitor network status. The password can be alpha-numeric.
The unit is shipped with password protection OFF. Entering a password in the MZ-RD Setup
Screen #1 enables password protection. After protection is enabled, the user will be prompted to
enter the password when an attempt is made to edit a setup parameter.
After entering the password, a 30 minute time period will be allowed for entries, after which the
user will again be prompted to re-enter the password.
IMPORTANT: Make note of your password and save it.

MZ-RD – Multi-Zone Remote Display
12 Instruction 3015-5157
3.3. Setup Programming
3.3.1. Setting the Clock
On the System Screen, access the Clock setup screen.
Clock Setup Screen
Use the cursor keypad to modify the field value and accept your entries. When editing is
complete, do one of the following:
•Select the SET RD CLOCK option to synchronize all gas monitors to the current date/time
setting.
•Select the ESC option to cancel all edits and revert to the previous setting.
•Press ENTER to accept the current date/time setting.
3.3.2. Navigating to the 1st MZ-RD Setup Screen
On the System Screen, select MZ-RD SETUP to access the MZ-RD Setup Screen #1.
MZ-RD Setup Screen #1

MZ-RD – Multi-Zone Remote Display
Instruction 3015-5157 13
3.3.3. Num Monitors on Net
This is the number of gas monitors connected to the MZ-RD.
NOTE: When first powered up, the MZ-RD will automatically detect all gas monitors
on the network with unique node addresses. Refer to Gas Monitor Node Address.
3.3.4. Monitor Baud
This is the baud rate of all gas monitors connected to the network. The default valve is 19200.
NOTE: All gas monitors on the network must have the same baud rate.
3.3.5. Audible Alarm

MZ-RD – Multi-Zone Remote Display
14 Instruction 3015-5157
This parameter selects the function of the MZ-RD’s internal audible alarm. Select Unused, Monitor
on, Evacuate, Spill, Leak, Fault, or Alarm.
3.3.6. BMS
This enables or disables the connection to a Building Management System. When selected, use
the UP/DOWN cursor keys to toggle the setting.
3.3.7. BMS Baud Rate
This is the baud rate of the Building Management System.
3.3.8. Password
This field is used to define a system password. The default setting is 000, which provides no
password protection.
3.3.9. Navigating to the 2nd MZ-RD Setup Screen
On MZ-RD Setup Screen #1, select MORE to access MZ-RD Setup Screen #2. Select BACK to
return to MZ-RD Setup Screen #1.
MZ-RD Setup Screen #1 MZ-RD Setup Screen #2
3.3.10. Setting Relay Parameters
This setting determines the function of relays 1 and 2 mounted inside the MZ-RD unit. Select
Unused, Monitor On, Evacuate, Spill, Leak, Fault, or Alarm.
NOTE: “Monitor On” means that the RD responds only to critical faults (i.e., any fault that
stops the units from monitoring, which includes lost communications with the MZ).
3.3.11. Node Address