STEP 4 |
Reconnect Lid
Internal Connections
Front Panel
Sensor
Connector J2
Sensor
Connector J3
Microprocessor Board
Connector J1
Buzzer
Pin 9
Pin 1
Pin 18
Power and Signal Wiring
(Terminal Block 1)
Pin 10
Relay Wiring
(Terminal Block T2)
Fixed Gas Detection
P/N: 1100-0618
| April 2021 Revision 0
Quick Start
Guide
Dual Sensor Gas Detector
for Refrigerant, Toxic & Combustible Gas Detection
4. Installation
USA Customer Service:
+1 724 334 5000
CAN Customer Service:
+1 905 882 8985
EU Customer Service:
+353 1 284 6388
website:
mybacharach.com
|
email:
Copyright © 2021 Bacharach, Inc. All Rights Reserved
2. Safety Instructions
(Continued)
DANGER:
The MGS-550 is NOT
certified or approved for operation
in oxygen-enriched atmospheres. Failure to comply may result in
severe injury or death.
WARNING:
Use this product
ONLY
for the purposes and under
the conditions listed in MGS-550 User Manual. Failure to comply
may result in injury and / or damage to the product.
WARNING:
The MGS-550 has not been designed to be intrinsically
safe for use in areas classified as being hazardous locations. For your
safety,
DO NOT
use in hazardous locations.
WARNING:
Consult a qualified professional before connecting
the MGS-550 to devices not mentioned in this manual. Failure
to comply may result in injury and / or damage to the product.
CAUTION:
Except for the maintenance detailed in this manual, this
product should
ONLY
be opened and / or serviced by authorized
personnel. Failure to comply may void the warranty.
1. Introduction
The MGS-550 gas detector is designed for use in refrigeration
applications and may be used as a standalone device, connected
to the MGS-402 or MGS-408 controllers, or connected to a facility’s
BMS / BAS. It enables compliance with refrigeration safety codes
(ASHRAE 15, EN 378, CSA-B52)
and features audible and visual
alarms to alert personnel in the event of a leak.
2. Safety Instructions
IMPORTANT:
The MGS-550 must be installed by a suitably qualified
technician who will install this unit in accordance with these
instructions and the standards in their particular industry / country.
This document is only intended as a guide and the manufacturer
bears no responsibility for the installation or operation of this unit.
#
Front Panel Component Description
1
Controller Power LED
2
Concentration LEDs (PPM, %LEL, %Vol - both off)
3
5-digit, 7-segment display (Gas, real-time concentration)
4
Magnetic Switches (dashed line around icon)
5
Tactile Switches (solid line around icon)
6
Local gas sensor element (remote sensor elements available)
STEP 2 |
Wire Connections
WARNING:
Ensure that all wiring connections are made BEFORE
applying power.
WARNING
:
POLARITY: For 24 VAC installations in a daisy-chain
configuration, the neutral polarity must be maintained for all instruments.
IMPORTANT:
T
he MGS-550 must be powered by either (a) a suitable
UL 60950 / CSA certified power supply that is isolated from line voltage
by double insulation, or (b) an appropriately rated UL listed / CSA Class
2 transformer.
IMPORTANT
:
Refer to MGS-550 User Manual for instructions for
connecting to the MGS-402 or MGS-408 controller.
1. Strip 0.2 to 0.25 inches
(5 to 7 mm)
of wiring insulation.
2. Unscrew the appropriate cable gland and gasket.
3. Connect the wires as indicated in the Internal Connections
in Section 3. Component Overview.
(Refer to the MGS-550 User
Manual for complete wiring details.)
4. Connect the shield of the power wires to the earth ground of
the central control system.
5. Screw the gland gasket onto the housing and tighten.
IMPORTANT:
Comply with all local and national laws, rules and
regulations associated with this equipment. Operators should be
aware of the regulations and standards in their industry / locality
for the operation of the MGS-550.
IMPORTANT:
The MGS-550 will come with one or no sensors
installed from the factory.
IMPORTANT:
The gas detector may have come with one factory
installed gas sensor element. A second gas sensor element may
be installed
(if applicable)
in the second M25 Cable gland at the
bottom of the gas detector.
IMPORTANT:
Any newly installed sensor(s) will need to be
registered with the gas detector.
1. Remove the factory installed cable gland and gasket.
2. Route the sensor lead into the cable gland with gasket
installed and tighten sensor into the gas detector housing.
3. Plug the sensor lead into either sensor connector J2 or J3
(see component overview, Internal Wiring Description)
routing
the sensor as shown in the diagram below. If both sensors
are to be installed (none installed from the factory) follow
the above instructions for each sensor to be installed.
STEP 1 |
Mount Gas Detector & Remove Lid
WARNING:
DO NOT
allow the lid/sensor to hang from the ribbon
cable. Failure to comply may result in damage to the product.
1. Mount the MGS-550 according to the product dimensions,
maximum wiring lengths and following considerations:
•
Environment:
the full range of environmental conditions
when selecting a location.
•
Application:
the specifics of the application
(possible leaks, air
movement / draft, etc.),
when selecting a location.
•
Accessibility
: the degree of accessibility required for
maintenance purposes when selecting a location.
•
Target Gas:
the specific gravity of the target gas when
selecting the height of the instrument.
2. Using a 5/32″
(4 mm)
hex key / Allen wrench
(not included)
remove
the lid and disconnect the ribbon cable from the base.
3. Set the lid and rubber gasket aside to be reinstalled later
IMPORTANT:
The manufacturer of this product recommends
that a bump test be performed following installation to verify
instrument functionality.
WARNING:
DO NOT
leave excess cable inside of the gas detector
housing. Failure to comply may result in damage to the product.
CAUTION:
When installing the sensor ribbon cable, care must
be taken to ensure the proper orientation of the connector at
both ends of the cable. Failure to ensure proper orientation may
result in loss of functionality and / or product damage.
IMPORTANT:
To achieve proper seal, the lid screws should be
torqued to 15 to 20 lb
f
in (1.5 to 2.0 Nm).
1. Ensure that all excess wire is minimized in the enclosure so
it doesn’t interfere with internal components.
2. Reinstall the rubber gasket. Ensure that it is correctly
seated by placing the side with two grooves face down and
the edge with two bumps on the top.
4. Installation
(Continued)
STEP 3 |
Installing One or Two Sensors
3. Component Overview
