MRLDS-250 Manual.book - Emerson Climate Technologies

MRLDS-250 Manual.book - Emerson Climate Technologies
026-1315 Rev 2 11-APR-2017
MRLDS-250 Infrared Gas Detector
Installation and Operation Manual
Emerson Retail Solutions
1065 Big Shanty Road NW, Suite 100
Kennesaw, GA 30144, USA
Phone 770-425-2724
Fax 770-425-9319
TABLE OF CONTENTS
1 INTRODUCTION.......................................................................................................................................................... 1
1.1. OVERVIEW ....................................................................................................................................................................
1.2. DETECTION OPTIONS ....................................................................................................................................................
1.2.1. Broadband vs. Gas Specific ..................................................................................................................................
1.2.2. Broadband Gas Detection.....................................................................................................................................
1.2.3. Detecting Specific Gases.......................................................................................................................................
1.3. REMOTE CONTROLLER OPTIONS ..................................................................................................................................
1.4. PARTS LIST ...................................................................................................................................................................
1.5. SPECIFICATIONS ............................................................................................................................................................
1
1
1
1
2
3
3
3
2 MOUNTING THE GAS DETECTOR......................................................................................................................... 4
2.1. WARNINGS AND PREREQUISITES ..................................................................................................................................
2.2. MOUNTING LOCATIONS ................................................................................................................................................
2.2.1. General Placement Guidelines .............................................................................................................................
2.2.2. Machinery Rooms .................................................................................................................................................
2.2.3. Refrigerated Spaces ..............................................................................................................................................
2.2.4. Chillers..................................................................................................................................................................
2.3. MOUNTING PROCEDURE ...............................................................................................................................................
4
4
4
4
5
5
5
3 WIRING AND CONFIGURATION ............................................................................................................................ 7
3.1.
3.2.
3.3.
3.4.
3.5.
OVERVIEW ....................................................................................................................................................................
WIRING SUPPLY POWER (24VAC OR 24VDC) ............................................................................................................
WIRING ALARM OUTPUT (ANALOG SIGNAL)...............................................................................................................
WIRING THE DIGITAL ALARM OUTPUT RELAY ............................................................................................................
FINISH INSTALLATION ..................................................................................................................................................
7
7
8
8
9
4 OPERATION AND STABILIZATION..................................................................................................................... 10
4.1. POWER UP AND WARM UP .........................................................................................................................................
4.2. STABILIZATION ...........................................................................................................................................................
4.3. PERFORM A MANUAL ZERO .......................................................................................................................................
4.4. ALARMS ......................................................................................................................................................................
4.5. GAS DETECTOR FAULTS .............................................................................................................................................
4.5.1. Overview .............................................................................................................................................................
4.5.2. Non-Critical Faults .............................................................................................................................................
4.5.3. Critical Faults .....................................................................................................................................................
10
10
10
10
10
10
11
11
5 CONFIGURE THE GAS DETECTOR ..................................................................................................................... 12
5.1. USER INTERFACE OVERVIEW .....................................................................................................................................
5.2. SETTING PARAMETERS ...............................................................................................................................................
5.2.1. Overview .............................................................................................................................................................
5.2.2. Configuration Parameters ..................................................................................................................................
5.3. COMPLETING SETUP ...................................................................................................................................................
12
12
12
12
15
6 FUNCTIONAL TESTS AND ADJUSTMENTS ....................................................................................................... 16
6.1.
6.2.
6.3.
6.4.
INTRODUCTION ...........................................................................................................................................................
BUMP TESTING VS. ADJUSTING DETECTOR RESPONSE ..............................................................................................
BUMP TESTING ...........................................................................................................................................................
ADJUSTMENT USING CALIBRATION GAS....................................................................................................................
16
16
17
18
7 TROUBLESHOOTING .............................................................................................................................................. 19
Table of Contents • i
7.1.
7.2.
7.3.
7.4.
FAULT CODES ............................................................................................................................................................. 19
DIAGNOSTIC ATTRIBUTES (P.-18) .............................................................................................................................. 20
RESETTING THE MRLDS-250 TO DEFAULT VALUES ................................................................................................. 20
OTHER SYMPTOMS...................................................................................................................................................... 21
8 REPLACEMENT PARTS AND ACCESSORIES.................................................................................................... 22
ii • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
1
Introduction
The broadband gas detector combines refrigerants
into three groups shown in Table 1-1. Measurement
performance is based on an average response profile
for all of the gases within the group.
1.1. Overview
NOTE: Greater accuracy may be achieved
through the use of calibration gas and the
adjustment procedure detailed in Section 6,
Functional Tests and Adjustments.
The MRLDS-250 NDIR (non-dispersive infrared)
is a fixed gas detector that can detect a wide range of
refrigerant gases. The MRLDS-250 can be used on a
stand-alone basis or integrated into controls or a
Building Management System (BMS).
Group #
Value for
Param 111
Refrigerant
R123
The MRLDS-250 can be used in locations that
require continuous monitoring and to add gas
detection solutions to an existing system.
R134a
R404a
R407a
R407c
1
P.-11 = 1
R407f
R410a
R427a
R507
HFO1233ZD
R448A
R449A
R422a
R422d
Figure 1-1 MRLDS-250 Components
2
P.1-11 = 2
R513A
1.2.1. Broadband vs. Gas Specific
1.2.2. Broadband Gas Detection
HFO1234Ze
R452A
1.2. Detection Options
The MRLDS-250 NDIR refrigerant gas detectors
are available in two versions: broadband and
gas-specific.
HFO1234YF
3
P.-11 = 3
R22
4
P.-11 = 4
R32
Table 1-1 Broadband Gas Groups
1
See Section 5, Configure the Gas Detector for information on
Parameter 11 and other configuration instructions.
The broadband gas detector (P/N 809-0030) is
used as a general purpose gross leak detector and is
factory tested and certified. It is shipped from the
factory with ±35% accuracy. If more accurate
detection is needed, gas-specific versions are
available (see Table 1-2), which are factory certified
and calibrated to the target refrigerant.
Overview
Introduction • 1
Part Number
Refrigerant1
Accuracy
809-0031
R22
±3%
809-0034
R404a
±3%
809-0035
R407a
±3%
809-0040
R422d
±3%
Table 1-2 Gas-specific Detector Measurement Performance
1
See Section 5, Configure the Gas Detector for Information on
Parameter 11 and other configuration instructions.
NOTE: Gas-specific detectors can be recalibrated in the field to new target gases. Use
optional calibration instructions in Section 6,
Functional Tests and Adjustments for
increased accuracy when detecting new target gas that
is different from the “as shipped” target gas. Refer to
the example in Table 1-3.
As Shipped
Figure 1-2 Broadband Gas Groups 1-3
1.2.3. Detecting Specific Gases
Each gas-specific gas detector is shipped factory
calibrated to its specific target refrigerant. Refer to
Figure 1-3 and Table 1-2.
Part number 809-0031 (R22) is factory
calibrated to R22.
Changed
Gas Type
(Reduced
Accuracy)
The gas detector may be changed to respond to
any of the other listed refrigerants (see
parameter P.-11, in Section 5.2., Setting
Parameters). If changed, the gas detector will
have a lower accuracy for the target refrigerant
(without calibration).
Table 1-3 Changing Gas Types and Accuracy
Figure 1-3 Gas-Specific MRLDS-250 Gas Detectors
2 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
Optional
Recalibration
(For
Improved
Accuracy)
1.5. Specifications
For default values, refer to Section 5.2., Setting
Parameters.
By applying calibration gas containing the
new target refrigerant, and via the routine
described in Section 6.4., Adjustment Using
Calibration Gas, the gas detector may then be
adjusted to respond with the calibrated
accuracy as shown in Table 1-2 for the new
target refrigerant.
Table 1-3 Changing Gas Types and Accuracy
1.3. Remote Controller
Options
The MRLDS can connect to any controller
through the standard analog output (voltage and
current; see Table 1-5 for options) such as the
standard alarm relay.
1.4. Parts List
Table 1-4 shows a list of components that are
available.
Part Number
Description
809-0030
MRLDS, Broadband
809-0031
MRLDS, Calibrated to R22
809-0034
MRLDS, Calibrated to R404A
809-0035
MRLDS, Calibrated to R407A
809-0040
MRLDS, Calibrated to R422D
809-0041
MRLDS, Calibrated to R448A
809-0042
MRLDS, Calibrated to R449A
809-0043
MRLDS, Calibrated to R513A
603-1100
Splash Guard
026-1315
Installation and Operation Manual
Specification
Description
Power Supply
24 VDC, 24 VAC 50/60 Hz,
2.5 W max
Power Monitoring
Green LED
Visual Alarm
Red 4-digit LED display
Audible Alarm
Buzzer (audible alarm), enable/disable
(Default enabled)
Fault Monitoring
Fault codes presented to user
Analog Outputs
4-20 mA; 0-5V; 0-10V; 1-5V; 2-10V
(Default 1-5V)
Relay
1 relay rated 1 A @ 24 VAC//VDC
(0.5A, 125V AC UL rating)
Range
0-3500 PPM
Squelch1
Readings below 75 PPM are squelched
by default
Alarm Delay
Selectable: 0 to 15 minutes
(Default, 0)
IP Rating
Not IP rated. An accessory splash
guard is available for areas requiring
additional protection from wash down.
Response Time,
T90
Five (5) minutes
Temperature
Rating
-22°F to 10°F (-30°C to 40°C)
Humidity and
Elevation
5-90% relative humidity, noncondensing, 0-10,000ft. altitude
Standard
Dimensions and
Weights
4.0” x 5.5” x 1.5”
6.3oz.
102 x 140 x 37mm 180g
Approvals
CE, MET/IEC/EN 61010-1
Table 1-5 Specifications
1
When filtering is disabled (see parameter P.-19 in Section
5.2.2., Configuration Parameters), the unit will respond to concentrations sub-10 PPM.
Table 1-4 Parts List
Remote Controller Options
Introduction • 3
2
Mounting the
Gas Detector
2.2. Mounting Locations
2.2.1. General Placement Guidelines
NOTE: The MRLDS-250 should be installed
plumb and level and securely fastened to a
rigid mounting surface.
2.1. Warnings and
Prerequisites
WARNING: Explosion hazard! Do not mount
the MRLDS-250 in an area that may contain
flammable liquids, vapors, or aerosols.
Operation of any electrical equipment in such
an environment constitutes a safety hazard.
CAUTION: The MRLDS-250 contains
sensitive electronic components that can be
easily damaged. Do not touch or disturb any of
these components.
NOTE: The mounting location of the monitor
should allow it to be easily accessible for visual
monitoring.
NOTE: The monitor must be connected to a
marked, suitably located and easily reached
switch or circuit breaker as a means of
disconnection.
CAUTION: Connect monitor power and signaling terminals using wiring that complies
with local ethical codes or regulations for the
intended application.
CAUTION: Do NOT mount the MRLDS-250
directly to vibrating machinery as the
vibrations may degrade the gas detector’s
performance.
NOTE: When installed in areas that may be
subjected to water spray, the optional splash
guard (P/N 603-1100) should be used in
conjunction with the MRLDS-250.
Gas detectors must be located within the
appropriate wire lengths from the central control unit
(if used).
2.2.2. Machinery Rooms
There is no absolute rule in determining the
number of gas detectors and their locations. However,
a number of simple guidelines can help in making a
decision. Gas detectors monitor a point as opposed to
an area. If the gas leak does not reach the detector, no
alarm will be triggered. Therefore, it is extremely
important to select the gas detector location carefully.
Also consider ease of access for maintenance.
The size and nature of the site can help in deciding
which method is the most appropriate to use.
Locations requiring the most protection in a
machinery or plant room would be in close proximity
to compressors, pressurized storage vessels,
refrigerant cylinders, storage rooms, or pipelines. The
most common leak sources are valves, gauges,
flanges, joints (brazed or mechanical), and filling or
draining connections.
•
In machinery rooms where there is little or no
airflow, placement options are:
• Point Detection: where gas detectors are located as
near as possible to the most likely sources of
leakage, such as the compressor, expansion valves,
mechanical joints, or cable duct trenches.
• Perimeter Detection: where gas detectors
completely surround the area or equipment.
4 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
•
Halocarbon and hydrocarbon refrigerants are
heavier-than-air gases and as such, the gas
detectors should be located near ground level
(6 to 18 inches from the floor).
NOTE: Gas detectors should be positioned just
far enough back from any high-pressure parts
to allow gas clouds to form and be detected.
Otherwise, a gas leak might pass by in a highspeed airflow area and go undetected by the gas
detector.
• Make sure that pits, stairwells, and trenches are
monitored since they may fill with stagnant pockets
of gas.
• For racks or chillers pre-fitted with refrigerant gas
detectors, these should be mounted so as to monitor
the compressors.
• Do not mount the gas detector directly to pipes or
structures that are subject to strong vibration.
2.2.3. Refrigerated Spaces
In refrigerated spaces, gas detectors should be
located away from doors, in the return airflow to the
evaporators on a sidewall (below head-high is
preferred), or on the ceiling, not directly in front of an
evaporator, nor in any direct airflow. In large rooms
with multiple evaporators, gas detectors should be
mounted on the central line between two adjacent
evaporators, as turbulence will result in airflows
mixing.
2.2.4. Chillers
2.3. Mounting Procedure
To open the housing as received, use a flat blade
screwdriver and depress the top latch. While pushing
the latch, grasp the back edge of the housing near the
latch and pull the back away.
When mounted, the housing is simply opened by
pressing the top latch with a suitable screwdriver or
other flat blade. With the top latch depressed, pull the
housing apart by grasping the sides and pulling
straight out. With the housing separated, the
mounting base with terminal blocks will be visible.
See Figure 2-1.
CAUTION: Do not apply caulking or other
material around the gas detector base. The gas
detector relies on air exchange through the
spaces between the base and the gas detector
housing. Do not obstruct the small gap around the
housing and the base with any material.
Step
1
Open the housing (see Figure 2-1).
2
Position the base to the pre-determined
(acceptable) mounting location. Use the gas
detector base to mark the mounting locations
as needed. The hole pattern on the backplate is
sized to mount the gas detector onto various
electrical junction boxes. The other holes may
be used as needed to mount the gas detector to
other structures, or onto a wall.
3
For Wall Mount, attach the MRLDS-250 base
to the mounting surface using two #6 screws
(provided) through two of the 7 mounting holes,
and be careful not to over-tighten the screws. Refer to Figure 2-2 for the locations of mounting
holes on the base.
In the case of small water- or air-cooled enclosed
chiller units, mount the gas detector to monitor
airflow to the extract fans. With larger models also
place a gas detector inside the enclosure under or
adjacent to the compressors.
For enclosed air-cooled chillers or the outdoor unit
for variable refrigerant volume and variable
refrigerant flow (VRV/VRF) systems, mount the gas
detector to monitor airflow to the extract fan. With
large units also place a gas detector inside the
enclosure under or adjacent to the compressors.
Mounting Procedure
For Junction Box Mount, attach the MRLDS250 base to the junction box (using mounting
hardware provided with your junction box)
through the two junction box holes. Refer to
Figure 2-2 for the locations of the two junction
box mounting holes on the base.
4
Unless you are ready to wire the device (see
Section 3, Wiring and Configuration),
carefully snap the cover onto the base unit.
Table 2-1 Mounting Procedures
Mounting Procedure
Mounting the Gas Detector • 5
Figure 2-1 Initial Housing Separation
Figure 2-2 Front and Back Views of MRLDS-250 Base
6 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
3
Wiring and
Configuration
3.1. Overview
Prior to wiring and configuring the MRLDS-250,
ensure the following conditions have been met:
• MRLDS-250 backplate is mounted in an appropriate
location.
• The cover panel is removed.
3.2. Wiring Supply Power
(24VAC or 24VDC)
CAUTION: Incorrect wiring may permanently
damage the gas detector and void the warranty.
Double check all terminations before applying
power.
Either 24VAC or 24VDC may be used to power
the MRLDS-250. Connect wiring to the appropriate
terminal locations (see ). Use two wires, between 14
and 22 AWG. Refer to Figure 3-2 for (AC wiring left)
or DC wiring (right).
If the cover panel was reattached after mounting,
open the gas detector enclosure by pressing the top
latch with a suitable screwdriver or other flat blade.
With the top latch depressed pull the housing apart by
grasping the sides and pulling straight out. Align and
press together to close.
Figure 3-2 Supply Power Wiring Options
Power
Option
Pin
Label
24 VAC
1
L
24V AC line
2
N
24V AC neutral
3
+
24V DC positive
4
GND
24V DC ground
24 VDC
Figure 3-1 Terminal Blocks and Cable Glands
Wiring Termination
Table 3-1 Power Options and Terminal Block Connections
NOTE: The pre-installed cable gland (left) and
the optional cable on the gland (right) have a
1/4 cable capacity (each).
NOTE: Install the optional cable gland in the
right side of the base unit if needed. Otherwise,
install the blanking plug that is included in the
mounting kit.
Overview
Wiring and Configuration • 7
WARNING: The MRLDS-250 must be
powered by either:
• A suitable UL 60950/CSA certified power supply
that is isolated from line voltage by double insulation,
or
• An appropriately rated UL listed/CSA Class 2
transformer.
Failure to comply can result in personal injury or
death.
Figure 3-4 Analog Output Wiring
WARNING: Neutral polarity must be
maintained across units. Refer to Figure 3-3.
Function
Pin
Wiring Termination
Analog
5
Analog output ground
Output
6
Analog output signal (+)
Table 3-2 Alarm Output Terminal Block Connections
The type of output signal on pins 5 and 6 is
programmable using the analog output type parameter
P.-03. Refer to Section 5, Configure the Gas
Detector for details.
Figure 3-3 Maintaining Neutral Polarity
3.3. Wiring Alarm Output
(Analog Signal)
The MRLDS-250 provides an analog output signal
that is proportional to the level of gas detected.
3.4. Wiring the Digital
Alarm Output Relay
An alarm setpoint may be programmed from the
front panel of the MRLDS-250. When the level of the
detected gas exceeds the alarm setpoint, the
MRLDS-250 enters the alarm state. An on-board
relay is tied to the alarm state, so you may activate (or
deactivate) external equipment based on the
MRLDS-250’s current alarm status.
NOTE: No jumpers or hardware switch
settings are required to configure the analog
output. This is done electronically from the
front panel display.
Connect two 18 to 20 AWG wires to terminal
block positions 5 and 6 (see Figure 3-4), noting
ground and signal polarity.
8 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
CAUTION: Do not apply caulking or other
material around the gas detector base. The gas
detector relies on air exchange through the
spaces between the base and the gas detector
housing. Do not obstruct the small gap around the
housing and the base with any material.
Figure 3-5 Sample Relay Output Wiring
NOTE: The relay can be programmed to be
failsafe (normally energized). By default, the
relay is set to be normally de-energized. This
can be set using parameter P-06.
Make relay connections (NO, NC, or both) using
18 to 20 AWG wires to terminal block positions 10,
11, and 12 (see Figure 3-5), noting normally open,
normally closed, and common connectors.
Function
Pin
Mounting Procedure
Relay (Alarm)
10
Relay NC contact
Output
11
Relay common contact
12
Relay NO contact
Table 3-3 Relay Output Terminal Block Connections
3.5. Finish Installation
Once the base is mounted and all wiring is
complete, align the gas detector housing and press it
onto the base. The gas detector will snap into position,
completing all electrical connections. Ensure the top
and bottom snap locks are engaged.
CAUTION: If the right cable gland was not
needed during installation and wiring, be sure
to install the blanking plug.
Finish Installation
Wiring and Configuration • 9
4
Operation and
Stabilization
4.1. Power Up and Warm
Up
On powering up, the MRLDS-250 will sense for
the presence of gas after an initial warm-up period of
two (2) to five (5) minutes. The green LED will flash
at a one-second interval during the warm up.
NOTE: Subsequent manual zeros may be
performed, provided the atmosphere around
the gas detector is free of all background
concentrations of refrigerant. Clean air or
nitrogen applied to the calibration port for five (5)
minutes may be used to ensure the gas detector is clear
of all background gas. Re-zeroing with background
refrigerant present will cause the gas detector to report
incorrect readings.
4.4. Alarms
The following occurs during an alarm condition:
Item
4.2. Stabilization
CAUTION: It is vital when first installing the
gas detector that it warms up in an atmosphere
that is known not to contain any background
concentrations of refrigerant. Emerson Retail
Solutions offers portable gas detectors for this purpose.
Contact Technical Support for more information.
4.3. Perform a Manual Zero
After the gas detector stabilizes, the power LED
stops flashing and is illuminated continuously.
Emerson Retail Solutions recommends manually
zeroing the MRLDS-250 after a 1-hour stabilization
period.
To manually zero the gas detector, press and hold
the UP and DOWN buttons simultaneously for five
(5) seconds. The gas detector will beep and the
display will show “zEro” when zeroing is complete.
The display will show “fAiL” if the temperature is
changing too quickly or there is an active alarm
condition.
NOTE: A manual zero should be performed in
the environment of operation and at the typical
operating temperature.
10 • MRLDS-250 Gas Detector Manual
Green
LED
Behavior During Alarm State
On (solid)
Display
On (blinks); reports detected PPM
concentration
Audible
Alarm
On (if enabled and after programmed delay
expires)
Relay
Output
Activates (after any programmed delay
expires)
Analog
Output
Changes proportionally with gas
concentration (as configured)
Table 4-1 MRLDS-250 Behavior During Alarm Conditions
NOTE: The alarm feature includes a 20% dead
band to prevent alarm “chatter” if the
concentration hovers near the alarm setpoint.
Once the alarm has been triggered, it will
remain latched until the concentration drops below
80% of the alarm setpoint.
4.5. Gas Detector Faults
4.5.1. Overview
There are two levels of fault monitoring built into
the gas detector:
1.
Non-critical
2.
Critical
026-1315 Rev 2 11-APR-2017
4.5.2. Non-Critical Faults
Non-critical faults typically recover by allowing
the gas detector surroundings to stabilize, for
example, after a defrost cycle. The gas detector
continues to monitor its surroundings during
non-critical faults, but may report inaccurate
readings.
The following occurs when a non-critical fault
condition exists.
Behavior During Non-Critical
Faults
Item
Green LED
Display
Analog Output
On (solid)
Shows the appropriate fault code
Operates Normally
Table 4-2 MRLDS-250 Behavior During a Non-Critical Fault
4.5.3. Critical Faults
Critical faults may indicate an unrecoverable
condition. Please refer to Section 7, Troubleshooting
for more information. The following occurs when a
critical fault condition exists:
Item
Green LED
Display
Analog Output
Behavior During Critical Faults
Off (solid)
Shows the appropriate fault code
4-20 mA output
Changes to 2 mA
1- 5V output
Changes to 0.5V
2-10V output
Changes to 1.0V
Table 4-3 MRLDS-250 Behavior During a Critical Fault
Gas Detector Faults
Operation and Stabilization • 11
5
Configure the Gas
Detector
Button
Description
Saves the currently displayed parameter
to memory.
Table 5-1 Button Functionality
5.1. User Interface
Overview
The gas detector is configured through the built-in
menu system. Once mounting is complete, attach the
gas detector to the base and apply power.
Figure 5-1 The User Interface of the MRLDS-250
The user interface consists of four pushbuttons, a
4-digit LED numeric display, and a power LED. The
four buttons allow the gas detector to be adjusted
based on a parameter list shown below. Button
functions are listed in Table 5-1.
Button
Description
Used to access the parameter list as well
as wake the display (when parameter
P.-09 is set to default). Used to back up
one level without writing to memory
when the parameter list is active.
Used to increment the value or parameter
displayed.
Used to decrement the value or parameter
displayed.
5.2. Setting Parameters
5.2.1. Overview
Press and hold the information button for
five (5) seconds to activate the parameter list:
Each parameter is shown in turn by using the UP
or DOWN buttons. The parameter is shown as P.-XX,
with XX being the parameter value. Pressing Enter
while a parameter is displayed allows the attributes of
the parameter to be set. Each Parameter has its own
attributes, as shown in the following table. Set the
attributes as desired, and then press Enter to save the
setting.
5.2.2. Configuration Parameters
Parameter
Description
Maintenance Mode
Sets gas detector to offline mode for 30
minutes.
00 Gas detector is online, with normal
response to its surroundings (default).
01 Gas detector is offline, and
suppresses all outputs. Display reads
“oFFL” (offline) during 30-minute
timeout.
Alarm Setpoint
Sets desired PPM value above which
alarm occurs. Use UP or DOWN buttons.
For faster “coarse” adjustment, hold both
buttons to sweep through the adjustment
range quickly. Default setpoint is 100
PPM.
Table 5-2 Configuration Parameters
When pressed together and held for
five (5) seconds, this key combination
manually zeros the gas detector.
Table 5-1 Button Functionality
12 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
Parameter
Description
Analog Output Type
Selects output type:
00
Selects 0-5V
01
Selects 1-5V (default)
02
Selects 0-10V
03
Selects 2-10V
04
Selects 4-20 mA
Alarm ON Delays
Sets the ON delay time (0-15 minutes) for
the alarm output signals (relay). The
default delay is 0 minutes.
Alarm OFF Delays
Sets the OFF delay time for the alarm
output signals (relay) in minutes (0-15).
The default delay is 0 minutes.
Relay Contact Behavior (Failsafe
Mode)
Sets the default relay power state so that
power loss can be detected.
The behavior of the relay changes from
energizing when an alarm condition
occurs (default) to energizing at power up
(Failsafe). In both cases the relay changes
state when an alarm occurs, failsafe is
simply inverted. This allows power
failures to be detected as alarms.
00
NO (default mode)
01 Failsafe mode
Relay Latching
Controls the relay latching behavior.
00 OFF (default). Relay does not latch,
and resets once the alarm condition is
removed.
01 ON. Relay remains latched; reset by
BMS command by pressing and holding
the Enter button for five (5) seconds.
Audible Alarm
The units have an internal audible alarm.
You can disable this, but the default setting
is “enabled” in compliance with EN378.
00
OFF
01
ON (default)
Display Mode
The display can be turned on by using this
parameter. When set to ON, the display
never shuts off (all operating modes).
When ON, the display shows the current
gas concentration (or 0 if below the
squelch). Note that P.-09 is disabled if
P.-19=0.
00
OFF during normal operation
(default)
01
ON
Parameter
Description
RS485 Node Address
Sets the RS485 node address (0001 to
0255)
Gas Groups / Specific Gas Selection
Selects either gas group number for
broadband operation or specific gas name
for gas-specific mode.
Broadband:
1 R134a, R404a, R407a, R123, R407c,
R407f, R427a, R507, R410A: Select from
three groups of gases:
2 R422a, R422d HFO1234YF, and
HFO1234Ze
3
R22 (by itself).
Specific Gas: The actual refrigerant name
is displayed. Select the appropriate
refrigerant.
NOTE: Gas-specific detectors are factory
calibrated to a single refrigerant using
specialized manufacturing equipment. If
another refrigerant is selected that differs
from the factory calibrated setting, the
built in calibration no longer applies.
Further improvement in detector accuracy
may be gained by applying calibration gas
containing the newly selected refrigerant
and adjusting the gas detector reading to
match (see Parameter P.-17).
Buzzer Mute Time
Sets a time (0 to 59 minutes) during which
the active buzzer remains muted:
• After the “I” button is pressed, or
• After Modbus register 4000 is set to
0.
Baud Rate
Sets the baud rate for Modbus (RS485)
communications.
00 9,600 baud (default)
01 19,200 baud
Stop Bits
Sets the number of stop bits required to
match the controlling communications
equipment (for example, Building
Management System - BMS).
01
1 stop bit (default)
02 2 stop bits
Parity
Sets Modbus parity option.
00
None (default)
01 Odd parity
02 Even parity
Table 5-2 Configuration Parameters
Table 5-2 Configuration Parameters
Setting Parameters
Configure the Gas Detector • 13
Parameter
Description
Analog Output Scaling
Allows the user to select the full-scale
PPM value that represents maximum
analog output (for example, 20 mA) for
scaling the analog output. Adjustment
range is from 100 PPM to 3500 PPM.
Default = 3500 PPM. (The setting cannot
be adjusted above 3500.)
Use the UP and DOWN buttons to set the
desired full scale value. All outputs will
be scaled to the indicated full scale value.
NOTE: Alarm values are not scaled, but
are absolute values. Setting a smaller full
scale does not correspondingly scale the
alarm setting.
NOTE: When the PPM level is greater
than the programmed analog output Full
Scale PPM (P.-16), the analog output will
go to a 10% over range state (indicating
that the concentration is too high for the
analog output to achieve). For example,
for a 1-5V setting the analog output would
go to 5.5V, for 4-20 mA it would go to
22 mA and so on.
Table 5-2 Configuration Parameters
NOTE: The analog output signal range is from
100 PPM to the default value of 3500 PPM,
which is scaled across the actual output range
selected by the analog output type parameter
P.-03. The upper PPM limit is programmable using
analog output scaling parameter P.-16. This parameter
sets the full scale PPM value creating a PPM range
across which the analog output is scaled. See
Figure 5-2 for more details.
Parameter
Description
Gas Test Mode
Places the gas detector in gas test mode.
00 Disabled (default)
01 Enabled
The display changes to four dashes
(----) until gas is applied. When gas is
applied, the live concentration is
displayed. See Section 6.4., Adjustment
Using Calibration Gas for the calibration
procedure.
NOTE: To prevent false alarms, all
outputs are suspended while Test Mode is
active. The only live indication is the
4-digit display.
Diagnostics Menu
Parameter 18 provides access to the
self-diagnostic information. The LED
display shows “DIAG” until the Enter
button is pressed. Use the UP and DOWN
buttons to scroll through the list of
diagnostic attributes.
A.-01 Current fault condition
A.-02 Last fault
A.-03 Days in service
A.-04 Days since last adjust/test
A.-05-A.-07 Factory Use Only
A.-08 Detector temperature in °C
A.-09 Temperature rate of change
A.-10-A.-17 Factory Use Only
See Section 7, Troubleshooting for a
complete list of codes and options.
Table 5-2 Configuration Parameters
Figure 5-2 Analog Output Scaling Options
14 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
Parameter
Description
Response Filtering
This parameter is used to turn filtered
output ON (01) or OFF (00).
The default setting is ON (01). The analog
output is filtered so that responses below
the 75 PPM are squelched. If the display
mode (P.-09) is set to ON (01) the display
shows 0 for any signal level below 75 PPM.
Some installations may wish to monitor the
small analog output changes that may be
created by the detector environment.
Turning filtering OFF (00) allows these
small variations around the minimum
analog output (for example, 4 mA, 1V.,
etc.) to be transmitted via the analog output
terminals.
NOTE: The detector display is OFF when
filtering is OFF (P.-09 is disabled).
NOTE: Whenever filtering is OFF the
detector display will turn ON for 10
minutes if the detector is re-zeroed (see
Section 4.3., Perform a Manual Zero).
This is intended to aid maintenance testing.
The analog outputs continue to transmit the
full, unfiltered range, and the alarm setpoint
remains active.
Table 5-2 Configuration Parameters
5.3. Completing Setup
To complete the setup after all parameters are set
as needed, simply press and hold the information
button for five (5) seconds to exit the Parameter list:
The gas detector is now actively monitoring its
surroundings.
NOTE: If no buttons are pressed for two (2)
minutes, the MRLDS-250 exits setup mode
automatically.
Completing Setup
Configure the Gas Detector • 15
6
Functional Tests
and Adjustments
6.1. Introduction
To comply with the requirements of EN378 and
the European F-GAS regulation, gas detectors must
be tested annually. However, local regulations may
specify the nature and frequency of this test.
CAUTION: Check local regulations on
calibration or testing requirements.
CAUTION: The MRLDS-250 contains
sensitive electronic components that can be
easily damaged. Do not touch or disturb any of
these components.
CAUTION: Before testing the gas detectors
on-site, the MRLDS-250 must be powered up
and allowed to stabilize.
CAUTION: After initial installation, the
MRLDS-250 should be gas tested to ensure
proper operation.
CAUTION: The testing and/or adjustment of
the unit must be carried out by a suitably
qualified technician, and must be completed:
• In accordance with this manual.
• In compliance with locally applicable guide
lines and regulations.
Suitably qualified operators of the unit should be aware
of the regulations and standards set down by the
industry/country for the testing or calibration of this
unit. This manual is only intended as a guide and,
insofar as permitted by law, Emerson Retail Solutions
accepts no responsibility for the calibration, testing, or
operation of this unit.
The frequency and nature of testing or calibration may
be determined by local regulation or standards.
CAUTION: Annual checks and adjustment
using calibration gas is recommended.
Calibration gas adjustment frequency may be
extended based on application, but should
never exceed a time period of two years.
WARNING: In applications where life safety is
critical, calibration gas adjustment should be
completed quarterly (every three months) or on
a more frequent basis. Emerson Retail
Solutions is not responsible for setting safety practices
and policies. Safe work procedures including
calibration policies are best determined by company
policy, industry standards, and local codes.
WARNING: Failure to test or adjust the unit in
accordance with applicable instructions and
with industry guidelines may result in serious
injury or death. The manufacturer is not liable
for any loss, injury, or damage arising from improper
testing, incorrect adjustment, or inappropriate use of
the unit.
EN378 and the F-GAS Regulation require an annual
check in accordance with the manufacturer’s
recommendation.
6.2. Bump Testing vs.
Adjusting Detector
Response
There are two concepts that need to be
differentiated:
1.
Bump test
2.
Gas detector response adjustment
Bump Test:
A bump test exposes the gas detector to a gas. The
operator then observes the gas detector’s response to
the gas. The objectives are two-fold:
• Establishes if the gas detector is reacting to the gas.
• Determines if all of the detector outputs are working
16 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
correctly.
There are two types of bump tests:
• Quantified: A known concentration of gas is used.
• Non-quantified: A gas of unknown concentration is
used.
Gas Detector Response Adjustment:
Adjusting gas detector response exposes the gas
detector to a calibration gas as well (like a quantified
bump test), but additionally sets the actual gas
detector response level (via parameter P.-17) to
ensure that the gas detector activates at the specified
gas concentration.
Refer to Section 6.3., Bump Testing and Section
6.4., Adjustment Using Calibration Gas for
additional information on bump testing and gas
detector response adjustment.
CAUTION: Before you carry out the test or
adjustment:
• Advise occupants, plant operators, and supervisors.
• Check if the gas detector is connected to external
systems such as sprinkler systems, plant shut down,
external sirens and beacons, ventilation, etc., and
disconnect as instructed by the customer.
• For bump test or calibration, the MRLDS-250
should be powered up and fully stabilized per Section
4, Operation and Stabilization.
6.3. Bump Testing
CAUTION: Notify others that testing is
underway. During bump testing, the alarm
outputs are active and will trigger the intended
response. It is the operator’s responsibility to
ensure that such actions are acceptable and can be
performed safely.
After installation and parameter setup (see Section
5, Configure the Gas Detector), the units should be
bump tested. Expose the gas detector to test gas. The
gas selected should be a high enough concentration to
put the system into alarm and illuminate the LED
display.
With a bump test you can see the functions of the
gas detector:
• The LED display will illuminate and show the
detected PPM concentration once the alarm setpoint
is reached.
• The relay and audible alarm will function as
configured.
• The output (0-10V, for example) will show the gas
level.
Ideally bump tests are conducted on-site in a clean
air atmosphere.
NOTE: To test the audible alarm and/or relay
function, check if the delay is set to zero and
exposed to gas. You can mute the audible
alarm by pressing the Information button. The
alarm will reactivate after the timeout set in parameter
P.-12.
Step
Bump Testing Using Calibration Gas
Cylinders
1
Remove the Splash Guard accessory if one is used.
2
Connect the regulator to the test gas port using 3 mm
or 1/8” inside diameter tubing (see below).
3
Expose the gas detector to gas from the cylinder.
Monitor the LED display reading. Refer to the
Section 1.5., Specifications for acceptance criteria.
Table 6-1 Adjustment Using Calibration Gas Cylinders
CAUTION: Do not pressurize the gas detector.
Limit the flow to one liter per minute
maximum.
Bump Testing
Functional Tests and Adjustments • 17
Step
Figure 6-1 Using Calibration Gas
6.4. Adjustment Using
Calibration Gas
Adjustment Using Calibration Gas requires a gas
cylinder with the appropriate gas and concentration.
Note that a calibration kit if offered that consists of a
calibration gas cylinder and a flow regulation valve
with flexible non-absorbent tubing.
NOTE: For improved accuracy and response,
the gas detector should be protected from
excess drafts while performing the adjustment.
Excess air circulation may dilute the applied
calibration gas and lead to a lower than expected
response.
Step
Bump Testing Using Calibration Gas
Cylinders
1
Connect the regulator to the test gas port using 3 mm
or 1/8” inside diameter tubing.
2
Activate parameter P.-17 Gas Test Mode (Section 5,
Configure the Gas Detector). The gas detector will
report 0 PPM if the calibration gas is off; otherwise,
it will report the real time gas concentration in PPM.
NOTE: The analog outputs, relay activity, and PPM
reporting are suspended in Gas Test Mode to prevent
false alarms.
3
Expose the gas detector to gas from the cylinder.
Monitor the 4-digit LED display reading.
Bump Testing Using Calibration Gas
Cylinders
4
Wait for the PPM reading to stabilize. This should
take approximately four (4) to six (6) minutes. Minor
changes (less than 5 PPM in 10 seconds) are
considered stable readings. Compare the response
value with the calibration gas concentration.
5
Adjust the gas detector displayed value by using the
UP or DOWN buttons to increase or decrease the
value shown. Adjust until the reading is within ± 2%
of the calibration gas. For example, if the calibration
gas is 1000 PPM, the gas detector is adjusted
properly when the displayed reading is between 980
and 1020 PPM.
6
Press the Enter button to store the new adjustment.
Turn off the calibration gas and remove the tubing
from the calibration port. If no further changes to the
other Parameters are required, press and hold the
information button for five (5) seconds to exit the
Parameter list.
Table 6-2 Adjustment Using Calibration Gas Cylinders
NOTE: When Gas Test Mode is activated, the
gas detector disables the relay and analog
output signals for 30 minutes. This allows time
for the calibration gas to dissipate after testing
to help avoid false alarms. Remove the calibration gas
as soon as possible after completing the test to allow the
gas detector to clear.
NOTE: All calibration gas mixtures have a
blend tolerance. The tolerance will limit the
actual adjustment accuracy that is achievable.
Table 6-2 Adjustment Using Calibration Gas Cylinders
18 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
7
Troubleshooting
Hex
Code
Possible
Causes
0x0001
7.1. Fault Codes
Gas Detector
Temperature
Fault
Gas Detector
temperature
reports > 55°C
or < -35°C.
To comply with the requirements of EN378 and
the European F-GAS regulation, gas detectors must
be tested annually. However, local regulations may
specify the nature and frequency of this test.
Gas Detector
Temperature
Rate of
Change Fault
0x0002
Temperature
rate of change
exceeds ~1°C/
min for more
than 15
minutes.
Open Loop
Fault
0x0010
Possible wiring,
connection,
and/or
termination
issue exists.
There are two classes of fault conditions: critical
and non-critical. In general, non-critical faults occur
when environmental conditions exist that are outside
the product’s specified operating range, or if an
installation error has occurred (for example, incorrect
wiring).
PPM
Overrange
Fault
0x0040
PPM exceeds
9999. This may
indicate a gross
(very large)
leak. If no leak
is present, it
indicates a gas
detector error.
The gas detector will typically continue to monitor
its surroundings (except for fault F.-08), and may
report inaccurate readings and false alarms.
Input Voltage
Fault
0x0080
Input supply
power to the
MRLDS-250 is
out of range
(i.e., 24V
±20%).
IMPORTANT:
If this fault is
active, the gas
detector is
offline and not
monitoring.
Correct the
input supply
voltage to
restore normal
operation.
Description
The MRLDS-250 features sophisticated internal
status monitoring and will indicate whether a fault
condition exists on the front display (F.-XX, with XX
being the fault number).
Fault
Code
Correcting non-critical faults is a matter of waiting
for the environmental conditions to return to a more
typical condition, correcting wiring mistakes, or in
some cases, relocating the gas detector. For example,
placing the gas detector near a forced air heater may
cause temperature faults. The non-critical fault range
is F.-01 to F.-08.
Critical faults indicate a functional problem that
results in the gas detector no longer monitoring its
surroundings for refrigerant.
Critical Faults
The fault number is displayed and the power LED
is turned off, indicating that the gas detector is offline.
The critical fault range is F.-09 to F.-16. If any of
these faults are active, the gas detector should be
removed from service and replaced.
Additionally, the faults are stored as a hex number
and can be accessed in the Diagnostics menu P.-18.
The associated hex codes are listed next to the Fault
Code in . Refer to Diagnostics Menu P.-18 in the next
section for additional information.
Fault Codes
Critical fault.
Gas detector
should be
removed from
service and
replaced.
:
:
Table 7-1 Fault Codes
Troubleshooting • 19
7.2. Diagnostic Attributes
(P.-18)
Use this option to review the built-in diagnostic
attributes. Access the parameter list (see Section 5,
Configure the Gas Detector) and select P.-18. Press
the Enter button to access the diagnostics, and then
use the UP or DOWN buttons to select each attribute.
The following information is available.
Attribute
Description
Displays the sensor’s approximate rate of
temperature change per half minute
interval (°C change over 30 seconds).
:
Reserved
Description
Displays the current fault condition code
in hex format:
0000 = no faults are active
XXXX = HEX number
See for the HEX format cross reference.
Displays a hex format code that
corresponds to any faults that occurred
since the internal fault record was last
erased. See Table 7-1 for the HEX format
cross reference. The records may be
erased by pressing the ENTER button.
Displays the number of days that the
MRLDS-250 has been in service. The
value of this attribute rolls over after
9999.
Displays the elapsed time (in days) from
the last gas adjustment or test. This value
is automatically reset to 0000 after
completing a gas adjustment via Test
Mode P.-17. (Note that the new
adjustment is stored using the Enter
button.) The value may be reset to 0000
by pressing the ENTER button.
:
Attribute
Table 7-2 Diagnostics Attributes
7.3. Resetting the MRLDS250 to Default Values
The gas detector may be reset to its default state
(as shipped from the factory) if needed, to aid in
troubleshooting. All settings, including alarm
setpoint, gas adjustments, selected gas curve, and
others revert to the factory default condition. Before
performing this operation it is advisable to write down
all parameter settings for later reference so they can
be re-programmed.
Symptom
1
Access diagnostics menu P.-18.
2
Press and hold both the UP and DOWN
buttons for five (5) seconds. This will cause
the following to occur:
• All the LED segments will then light for
three (3) seconds.
• The gas detector resets to the default
settings.
• The gas detector beeper sounds for three
(3) seconds.
3
After three (3) seconds the user is returned
to the parameter list at parameter P.-18.
4
The gas detector may now be
re-programmed for further troubleshooting
if needed.
Reserved
Displays the sensor temperature in °C.
Description
Table 7-3 Resetting MRLDS-250 to Default Values
Table 7-2 Diagnostics Attributes
20 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
7.4. Other Symptoms
Other common wiring problems can also cause the
gas detector to malfunction. Check below for
additional conditions that will cause gas detector
issues.
Symptom
Green
power
LED off
Alarms in
the
absence of
a leak
Possible Cause(s)
Check power supply. Check Wiring.
If you experience alarms in the absence of a
leak, try setting an alarm delay.
Perform a bump test to ensure proper
operation.
Table 7-4 Other Symptoms and Possible Causes
Other Symptoms
Troubleshooting • 21
8
Replacement
Parts and
Accessories
The following items are available as
replacement parts:
NOTE: All modules come ready to mount to
the original mounting base provided.
Part Number
Description
809-0030
Gas Detector Module, Broadband
809-0031
Gas Detector Module, Calibrated to
R22
809-0034
Gas Detector Module, Calibrated to
R404a
809-0035
Gas Detector Module, Calibrated to
R407a
809-0040
Gas Detector Module, Calibrated to
R422d
026-1315
Installation and Operation Manual
603-1100
Splash Guard Kit (Accessory): Provides
additional protection for wash down or
impact. Includes mounting hardware for
attaching to walls.
NOTE: The gas detector response time
will lengthen when the Splash Guard is
used. The installer is responsible for
determining whether the response time is
suitable for the application.
Table 8-1 Replacement Parts and Accessories
22 • MRLDS-250 Gas Detector Manual
026-1315 Rev 2 11-APR-2017
The contents of this publication are presented for informational purposes only and they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described
herein or their use or applicability. Emerson Climate Technologies Retail Solutions, Inc. and/or its affiliates (collectively “Emerson”), reserves the right to modify the designs or specifications of such
products at any time without notice. Emerson does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any product
remains solely with the purchaser and end-user.
026-1315 11-APR-2017 Emerson is a trademark of Emerson Electric Co. ©2017 Emerson Climate Technologies Retail Solutions, Inc. All rights reserved.
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising