Bacharach MVR-300 Operating Manual
MVR-300™
Refrigerant Gas Detector
for Occupied Spaces
User Manual
Installation ● Operation ● Configuration ● Troubleshooting
P/N: 6203-9000
August 2018
Revision 3
Product Leadership Training Service Reliability
MVR-300™ Refrigerant Gas Detector
2 P/N: 6203-9000 Revision 3
WARRANTY POLICY
Bacharach, Inc. warrants this detector, excluding sensors, to be free from defects in materials and workmanship for a period of 12
months from the date of purchase by the original owner. The sensor has a pro-rated warranty period of 12 months. If the product
should become defective within this warranty period, we will repair or replace it at our discretion.
The warranty status may be affected if the detector has not been used and maintained per the instructions in this manual or has been
abused, damaged, or modified in any way. This detector is only to be used for purposes stated herein. The manufacturer is not liable
for auxiliary interfaced equipment or consequential damage.
Due to ongoing research, development, and product testing, the manufacturer reserves the right to change specifications without
notice. The information contained herein is based on data considered accurate. However, no warranty is expressed or implied
regarding the accuracy of this data.
All goods must be shipped to the manufacturer by prepaid freight. All returned goods must be pre-authorized by obtaining a return
merchandise authorization (RMA) number. Visit www.mybacharach.com for an RMA number and procedures required for product
transport.
SERVICE POLICY
Bacharach, Inc. maintains a service facility at the factory. Some Bacharach distributors/agents may also have repair facilities; however,
Bacharach assumes no liability for service performed by anyone other than Bacharach personnel. Repairs are warranted for 90 days
after date of shipment (sensors, pumps, filters and batteries have individual warranties). Should your detector require non-warranty
repair, you may contact the distributor from whom it was purchased or you may contact Bacharach directly.
If Bacharach is to do the repair work, send the detector, prepaid, to the closest Service Center.
Location
Contact Information
Shipping Address
United States
Phone: 724-334 -5000
Toll Free: 800-736-4666
Fax: 724-334 -5001
Email: help@mybacharach.com
Bacharach, Inc.
621 Hunt Valley Circle
New Kensington, PA 15068, USA
ATTN: Service Department
Europe
Phone: +353 1 284 6388
Fax: +353 1 284 6389
Email: help@mybacharach.com
Bacharach, Inc.
114A Georges Street Lower
Dun Laoghaire, Dublin, Ireland
ATTN: Service Department
Canada
Phone: 905-882 -8985
Fax: 905-882 -8963
Email: support@bachcan.ca
Bacharach, Inc.
10 West Pearce Street, Unit 4
Richmond Hill, Ontario LB4 1B6, Canada
ATTN: Service Department
Always include your RMA #, address, telephone number, contact name, shipping/billing information and a description of the defect as
you perceive it. You will be contacted with a cost estimate for expected repairs prior to the performance of any service work. For
liability reasons, Bacharach has a policy of performing all needed repairs to restore the detector to full operating condition.
Prior to shipping equipment to Bacharach, visit www.mybacharach.com for an RMA # (returned merchandise authorization). All
returned goods must be accompanied with an RMA number.
Pack the equipment well (in its original packing, if possible), as Bacharach cannot be held responsible for any damage incurred during
shipping to our facility.
NOTICES
This manual is subject to copyright protection; all rights are reserved under international and domestic copyright laws. This manual
may not be copied or translated, in whole or in part, in any manner or format, without the written permission of Bacharach, Inc.
All software utilized and/or distributed by Bacharach is subject to copyright protection. All rights are reserved. No party may use or
copy such software in any manner or format, except to the extent that Bacharach grants them a license to do so. If this software is
being loaded onto more than one computer, extra software licenses must be purchased.
MVR-300™ is a trademark of Bacharach, Inc. All rights reserved.
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TABLE OF CONTENTS
SECTION 1. SAFETY ............................................................................................................................ 5
1.1 Definition of Alert Icons .............................................................................................................. 5
1.2 General Safety Statements ....................................................................................................... 5
1.3 Safe Connection of Electrical Devices ...................................................................................... 6
SECTION 2. DESCRIPTION .................................................................................................................. 7
2.1 Product Overview ...................................................................................................................... 7
2.2 Intended Use ............................................................................................................................. 7
2.3 Design Features ........................................................................................................................ 7
2.4 Components Overview .............................................................................................................. 8
SECTION 3. INSTALLATION .............................................................................................................. 10
3.1 General Information for Installation ......................................................................................... 10
3.2 Mechanical Installation ............................................................................................................ 10
3.3 Configuration ........................................................................................................................... 12
3.4 Electrical Installation ................................................................................................................ 14
SECTION 4. OPERATION ................................................................................................................... 17
4.1 Start-up .................................................................................................................................... 17
4.2 Alarm Management Function and Configuration ..................................................................... 17
4.2.1 Default Alarm Function ............................................................................................... 17
4.2.2 Alarm Delay – Switches 2 and 3 ................................................................................ 18
4.2.3 Failsafe – Switch 4 ..................................................................................................... 20
4.2.4 Alarm 2 Relay – Switch 5 ........................................................................................... 20
4.2.5 Latching Alarm State – Switch 6 ................................................................................ 20
4.2.6 Buzzer Disable – Switch 7 .......................................................................................... 20
4.3 Other Switch Configurations .................................................................................................... 21
4.3.1 Reset (Cycle Power) - Switch 1 ................................................................................ 21
4.3.2 Reset to Factory Default Values - Switch 8 ............................................................... 21
4.4 Operation of Magnetic Switches, Buzzer, and LED ................................................................ 22
SECTION 5. MAINTENANCE .............................................................................................................. 23
5.1 Maintenance Intervals ............................................................................................................. 23
5.2 Adjustments ............................................................................................................................. 23
5.2.1 Introduction ................................................................................................................. 23
5.2.2 General Procedure ..................................................................................................... 24
5.2.3 Zero Adjustment ......................................................................................................... 25
5.2.4 Span Adjustment ........................................................................................................ 25
5.2.5 Bump Test .................................................................................................................. 26
5.3 Troubleshooting ....................................................................................................................... 26
5.3.1 Failed Span Adjustment ............................................................................................. 26
5.3.2 Hexadecimal Format .................................................................................................. 27
5.3.3 Fault Conditions .......................................................................................................... 28
5.3.4 Fatal Faults ................................................................................................................. 29
5.3.5 Critical Faults .............................................................................................................. 29
5.3.6 Negative Gas Fault ..................................................................................................... 29
5.3.7 Non-Critical Faults ...................................................................................................... 29
5.4 Replacing the Sensor Module ................................................................................................. 30
5.5 Cleaning the Detector .............................................................................................................. 31
SECTION 6. SENSOR PRINCIPLE ..................................................................................................... 32
SECTION 7. DISPOSING OF THE DETECTOR ................................................................................. 32
SECTION 8. TECHNICAL DATA......................................................................................................... 33
8.1 Approvals ................................................................................................................................. 33
8.2 Specifications for Modbus RTU Digital Communication over RS-485 .................................... 33
8.3 Power Supply and Relay Specifications .................................................................................. 33
8.4 Wiring Specifications ............................................................................................................... 33
8.5 Physical Specifications ............................................................................................................ 34
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8.6 Environmental Specifications .................................................................................................. 34
8.7 Sensor Specifications .............................................................................................................. 34
8.8 Default Alarm Levels ............................................................................................................... 34
8.9 Modbus Registers .................................................................................................................... 35
8.9.1 Read Device Identification .......................................................................................... 35
8.9.2 Analog Input Registers ............................................................................................... 35
8.9.3 Analog Output Registers ............................................................................................ 37
8.9.4 Input Status Flags ....................................................................................................... 38
8.9.5 Output Status Flags .................................................................................................... 39
SECTION 9. ORDERING INFORMATION .......................................................................................... 41
9.1 MVR-300 Refrigerant Leak Detector Configurations ............................................................... 41
9.2 MVR-300 Refrigerant Leak Detector Configurations (UK Version) ......................................... 41
9.3 Accessories ............................................................................................................................. 42
SECTION 10. CUSTOM UK BACK BOXES AND FACEPLATES ....................................................... 43
10.1 Introduction to UK Version ....................................................................................................... 43
10.2 Hardware Overview – UK Version ........................................................................................... 43
10.3 Using Optional Metal Tabs ...................................................................................................... 44
10.4 Electrical Installation – UK Version ......................................................................................... 44
10.5 Customizing Face Plates ......................................................................................................... 45
10.6 Calibration ................................................................................................................................ 46
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SECTION 1. SAFETY
1.1 Definition of Alert Icons
The following alert icons are used in this document to highlight areas of the associated text that require a
greater awareness by the user.
Alert
Icon
Description
DANGER
Indicates an imminently hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING
Indicates a potentially hazardous situation which, if not avoided, could
result in death or serious injury.
WARNING
Indicates a potential electrical shock hazard which, if not avoided,
could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, could
result in physical injury or damage to the product or environment. It
may also be used to alert against unsafe practices.
NOTICE
Indicates additional information on how to use the product.
1.2 General Safety Statements
Before using this product, carefully read and strictly follow the instructions in the manual.
Use the product only for the purposes specified in this document and under the conditions listed.
Ensure that product documentation is retained, made available, and appropriately used by anyone
operating the product.
Comply with all local and national laws, rules, and regulations associated with this product.
Only trained and competent personnel may use this product.
Only trained and competent personnel may inspect, repair and maintain the product as detailed in this
manual. Maintenance that is not detailed in this manual must be completed by Bacharach or
personnel qualified by Bacharach.
Use only genuine Bacharach spare parts and accessories. Otherwise, operation may be impaired.
Only operate the product within the framework of a risk-based alarm signaling concept.
CAUTION
REFRIGERANT SUFFOCATION RISK: Large refrigerant leaks into occupied spaces
can reach concentrations that pose a suffocation risk to the occupants. While the MVR300 can be used to detect refrigerant leaks well below those concentrations, it is not
designed as a stand-alone safety device. Safety of the occupants must take a system
design approach including ventilation, detection, early warning, mitigation, and design
redundancy among other considerations.
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1.3 Safe Connection of Electrical Devices
Before connecting this detector to electrical devices not mentioned in this manual, consult the manufacturer
or a qualified professional.
NOTICE
The sensor must be connected by a marked, suitably located and easily reached switch
or circuit-breaker as means of disconnection.
NOTICE
If replacement of either main power fuse is required, use only a TR5 Radial 3.15A 250V
slow fuse (Littlefuse 372 1315 0001 or equivalent).
CAUTION
Wiring must be in compliance with national and local wiring codes.
CAUTION
RS-485 signal cable must be insulated to the highest voltage level in the system. Protect
the RS-485 signal cable by using the supplied installation kit.
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SECTION 2. DESCRIPTION
2.1 Product Overview
The Bacharach MVR-300 continuously checks the ambient air of occupied spaces for refrigerant leaks. The
detector is for indoor applications. It is housed in an ABS enclosure that fits into many 2-gang and most 3gang electrical back boxes (not included).
NOTICE
The MVR-300 is designed for use in 2-gang and 3-gang back boxes with a minimum
depth of 47 mm (1.9”). Metal United Kingdom (UK) back boxes are also supported, but
require a special UK version of the MVR-300, slightly modified installation, and a
customized faceplate (not supplied by Bacharach). Otherwise, the UK version is
functionally the same. Refer to Chapter 10 for more information on the UK version and
its differences.
Figure 1. MVR-300 with Examples of Supported 2-gang Back Boxes
Gas alarms and status messages are indicated visually by a 3-colored LED and audibly by a buzzer. In
case of an alarm and / or fault, relays switch (for example, to shut-off valves or to activate alarm devices).
2.2 Intended Use
Checks ambient air of occupied spaces for refrigerant leaks
Intended for indoor applications
ABS enclosure fits into many 2-gang and most 3-gang electrical back boxes (not included)
Can be operated as a stand-alone detector or connected to a BMS/BAS (Building
Management/Building Automation) System
Designed to be installed in non-classified, non-hazardous, permanent locations.
2.3 Design Features
Powered by 100 to 240 VAC, 50/60 Hz
Gas alarms and status messages are indicated visually by a 3-colored LED and audibly by a buzzer
In case of an alarm and/or fault, relays can switch shut-off valves, alarm devices, or indicators at a
BMS/BAS
Measured gas concentration, status signals and configuration information are accessible via the
Modbus RTU interface (see Section 8.9 on page 34)
Can be calibrated and maintained non-intrusively using a magnetic wand
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2.4 Components Overview
Figure 2. MVR-300 Components (Front)
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Figure 3. MVR-300 Components (Back)
Item
Description of MVR-300 Components in Figure 2 and Figure 3
1
Coin slot to release bezel
2
Magnetic switch positions 1 (● on top) and 2 (●● on bottom)
3
Multi-color status LED
4
Grill
5
Decorative snap-on bezel
6
Cover plate (hinged)
7
Captive set screw
8
Detector base
9
Sensor type/calibration and ID/serial number labels
10
Mounting slots (×6)
11
Test point access holes (×2)
12
Sensor alignment ribs (×3)
13
Replaceable sensor module
14
Direction arrows (×2) for proper mounting
15
Hinges for cover plate
16
Hinges for bezel
17
Snap locks for bezel
18
Calibration adapter (fits cover plate and detector base)
19
Firmware version and part number/calibration labels
20
Configuration DIP switches (1-8)
21
Relay 1 output connectors (low gas alarm)
22
Relay 2 output connectors (high gas alarm or fault)
23
Power connectors
24
Modbus serial communications connectors
25
Rubber boot for Modbus port
26
Wiring harness
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SECTION 3. INSTALLATION
3.1 General Information for Installation
Every detail of installation location is critical to ensure overall system performance and effectiveness. Strict
compliance and considerable thought must be given to every detail of the installation process, including,
but not limited to the following:
Regulations as well as local, state, and national codes that govern the installation of gas detection
equipment
Electrical codes that govern the routing and connection of electrical power and signal cables to gas
detection equipment
The full range of environmental conditions to which the detectors will be exposed (refer to section 6:
Sensor Principle on page 32 for more information on ambient conditions and cross-sensitivity)
The physical characteristics of the gas or vapor to be detected
The specifics of the application (e.g., possible leaks, air movement/draft, etc.)
The degree of accessibility required for maintenance purposes
The types of optional equipment and accessories that will be used with the system
Any limiting factors or regulations that would affect system performance or installations
Wiring details, including the following:
o Wiring must be connected as indicated in this manual.
o The wiring for power and relays must be selected and fused according to the rated voltages,
currents, and environmental conditions.
o If stranded conductors are used, a ferrule should be used.
o A switch or circuit breaker must be included in the installation.
o The switch or circuit breaker must be suitably located and easily reached.
o The switch or circuit breaker must be marked as the disconnect device for the equipment.
3.2 Mechanical Installation
The detector fits in most 2-gang and 3-gang electrical back boxes (not included) (See Section 10 for
details on the custom UK version of the MVR-300)
The detector must be accessible for maintenance (e.g., adjustment)
The access pathway of the refrigerant gas to the sensor must not be obstructed
The detector should be installed about 4 to 6 inches (100 to 150 mm) above the floor level
Figure 4. A Sampling of 2-Gang Electrical Boxes Supported by the MVR-300
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Figure 5. Typical MVR-300 Installation in an Occupied Space Application
Figure 6. Recommended Installation Locations
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3.3 Configuration
Configuration is accomplished via switches or from a Remote Terminal Unit (RTU) on a Modbus serial
communications network. Review the default settings to determine if they are suitable for your particular
application. If default values are not suitable, change the configuration using the DIP switches, or via the
Modbus interface. A summary of switches is shown below. For details on Modbus communications
registers, refer to Section 8.9: Modbus Registers on page 35.
NOTICE
By default, switch configurations supersede Modbus configurations. Use Modbus register
2007 (Modbus Precedence over DIP Switch Settings) to change this precedence.
Changes of configurations will not take effect until the detector is restarted (i.e., toggling switch 1 or cycling
power).
NOTICE
For a proper reset, switch 1 must be toggled (ON then OFF). If it is left ON, the detector
is held in reset mode and will not function correctly until the switch is returned to the
OFF position.
Figure 7. Switches for Configuring the MVR-300
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Switch
Function
Options and Descriptions
Positions
1
Restart
Off = Normal Operation (default)
On = Restart MVR-300 (must return switch to OFF
position)
2, 3
Alarm ON
Delay
Off, Off = No delay (default)
Off, On = 5 minute delay
On, Off = 10 minute delay
On, On = 15 minute delay
4
Failsafe Relay
Selection
Off = Normal Relay Operation (default)
On = Failsafe Relay Operation
5
Relay 2 Fault
Indication
Off = High Alarm or Fault (default)
On = High Alarm Only
6
Alarm
Latching
Off = Alarms automatically reset (default)
On = Alarms latch and require manual reset
7
Buzzer
Disable
Off = Buzzer enabled (default)
On = Buzzer disabled
8
Reset
Detector
Settings to
Factory
Default Values
Off = Normal operation
On = Used in reset procedure for resetting Modbus
registers to their factory default values (see section
4.3.2 on page 21 for reset information and section 8.9
on page 35 for Modbus registers and default values).
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3.4 Electrical Installation
CAUTION
A switch or circuit breaker must be included in the installation. The switch or circuit
breaker must be suitably located and easily reached, and it must be marked as the
disconnect device for the equipment.
CAUTION
Ensure all wiring connections are made before applying power.
CAUTION
This product uses semiconductors which can be damaged by electrostatic discharge
(ESD). When handling the printed circuit boards (PCBs), observe proper ESD
precautions so that the electronics are not damaged.
CAUTION
RS-485 signal cable must be insulated to the highest voltage level in the system. Protect
the RS-485 signal cable by using the supplied installation kit.
CAUTION
Wiring must be in compliance with national and local wiring codes.
NOTICE
When inserting wire into the terminal, release the spring clamp by pushing the release
latch back.
Step
Description of Electrical Installation
1.
Remove bezel by releasing the two snap locks. When installed, insert coin into the slot to remove.
2.
Remove cover plate by loosening the set screw.
3.
Observing proper polarity, connect wires for power to the appropriate terminals.
Power
Label
Wiring
Termination
Figure 8. Wiring Power
100 to
240 VAC
L
VAC line
N
VAC neutral
Earth
Ground
G
VAC earth
ground
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Step
Description of Electrical Installation
4.
Observing proper polarity, connect normally closed (NC) common (COM), and normally open
(NO) wires for relays to the appropriate terminals.
Figure 9. Wiring Relay 1 (Low Gas Alarm) and Relay 2 (High Gas Alarm or Fault)
5.
Observing proper polarity, make the Modbus connections as follows, using the figures below for
reference.
Label
Description
Figure 10. Modbus Wiring Terminals
A
RS-485 “A” (non-inverted)
B
RS-485 “B” (inverted)
G
RS-485 shield
Prepare signal cable and put boot over the signal cable ().
Add ferules if required ().
Apply 10 cm piece of shrink wrap as close to the wire ends/ferules as possible while
leaving some free wire to allow connection to the detector ().
Heat the shrink wrap ().
Connect signal wires/ferules to the detector ().
Slide rubber boot along the wire and shrink wrap assembly and connect it to the
detector ().
Figure 11. Details for Connecting Modbus Communications Wiring
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