Murco MGS Provozní pokyny Strana 3

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3
For further detailed Installation tips covering most installations and equipment
types.. chillers, air cooled chillers etc see our web site www.murco.ie.
3- MGS - Typical settings
Gas: Refrigerant R404A Range: 0-1000ppm Alarm Set Point: 500ppm
For a particular unit please refer to the gas settings shown on the rating plate.
4- MGS- Installation and Wiring Diagram
See diagrams 1 and 2.
5- MGS - Operating Instructions
1- On powering up it will sense for the presence of gas after an initial warm-
up delay of 5 minutes, the green LED will flash at 1 second intervals during
the warm-up.
2- In alarm condition:
the green LED stays on
the red LED will be on
the siren operates (if it has not been disabled and after a delay if this
option has been selected)
the relay output activates (after a delay if this option has been selected)
the voltage or current output changes proportional to gas concentration
3- Fault condition:
the green LED will be off
the red LED will be on
a voltage or current fault output will activate
2mA on the 4-20mA output
0.5V on the 1-5V output
1.0V on the 2-10V output
6- MGS – Test / Function Instructions
The MGS is calibrated in the factory and does not require to be calibrated on
installation. After installation the units should be bump tested. Expose the
sensors to test gas using a Murco ampoule (NH3 or CO2 etc) or test cylinder
(appropriate to the installation) or crack open the valve of a cigarette lighter
(only for Semiconductor units) without igniting it and hold it over the vent holes
on the upper right side of the MGS. The gas is heavier than air and should fall
into the MGS. This will put the system into alarm. The red LED will light
showing the system is in alarm. The delay will prevent the siren sounding or
relay switching for the preset delay, if delay is set.
With a bump test you can see the functions of the sensor - the red led will
light, the relay and sounder will function, the output selected, say 0-10V- will
show the gas level.
To test the siren and or relay function, check the delay is set at zero using the
header as shown on the installation diagram and expose to gas as above. You
can mute the siren by removing the jumper JP2.
After the gas has cleared the red led, siren and relay will automatically reset.
Before testing the sensors on site the MGS must have been powered up and
allowed to stabilize.
7- MGS Sensor - Remote sensor head installation
If you do not wish to surface mount the MGS or need to match room decor,
we can supply a remote sensor with a decorative faceplate (standard:
brushed stainless steel). The remote sensor is mounted in an electrical back
box 44mm deep to which the vented face plate is fitted.
1. Remove the connector from the sensor PCB to feed the cable through the
trunking.
2. Immediately refit the connector to the sensor board in the backbox. The
MGS and remote sensor must be kept together as they are calibrated
together and are a matched pair.
Do not remove the sensor boards from a number of units at
the same time in case they get mixed up. If doing so, label
them, or, ensure you check the serial number on the main
PCB and the remote sensor PCB are the same when re-
installing.
3. If construction / decoration is still going on, fit a standard plastic blanking
plate immediately you install the sensor in the back box to avoid dust or
damage to the in-room sensor. You can fit the SS vented plate when
decoration is completed.
4. Cleaning: the decorative face plate should be lightly dusted – it should
not be sprayed with cleaning/polishing aerosols.
8- MGS Sensor - Annual Test
To comply with the requirements of EN378 and the F GAS regulation sensors
must be tested annually. However local regulations may specify the nature and
frequency of this test. If not the Murco recommended procedure should be
followed. Contact us for details.
Check local regulations on calibration or testing
requirements.
After exposure to a substantial gas leak, sensor should be checked and
replaced if necessary.
6
5
4
3
2
1
Relay and Sounder Delay – JP5 & JP6 off : no delay
JP5 on only : 1 minute
JP6 on only : 5 minutes
JP5 & JP6 on : 10 minutes
JP4 – on : Not used
JP3 – on : 4-20mA or 2-10 Volt output
off : 0-10Volt output
JP2 – on : Sounder enabled
JP1 – on : Divide Voltage output by 2
(0-5 or 1-5 Volt output
off : full 0-10 or 2-10 volt output
Relay Output
4-20mA output
0-5/1-5/0-10/2-10 Volt output
0V
Power
12 to 24V DC
12 to 24V AC
Adjust Span
Adjust Zero
Adjust Sounder
and Relay set point
(P1)
Sounder & Relay Set
Point Voltage
Short to Cancel
Warm up Delay
0V
S
ensor Voltage
Jumper for
AC or DC
Electrochemical Sensor
AC DC
A
D
A
D
SW2 SW1
6
5
4
3
2
1
R
elay and Sounder Delay – JP5 & JP6 off : no delay
JP5 on only : 1 minute
JP6 on only : 5 minutes
JP5 JP6 on : 10 minutes
JP4Not Used
JP3 – on : 4-20mA or 2-10Volt output
off : 0-10Volt output
JP2 – on : Sounder enabled
JP1 – on : Divide Voltage output by 2
0-5 or 1-5 Volt output
off : full 0-10 or 2-10 volt output
Relay Output
4-20mA output
0-5/1-5/0-10/2-10 Volt output
0V
Power
12 to 24V DC
12 to 24V AC
Adjust Span
Adjust Zero
Adjust Sounder
and Relay set point
(P1)
Sounder & Relay Set
Point Voltage
Sensor Voltage
Semiconductor Sensor
Jumper for
AC or DC
AC DC
A
D
A
D
0V
Short to Cancel
Warm up Delay
SW1SW2
Diagram 1
Diagram 2
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