Bacharach MGD-100 Installation And Operation Manual

Text of Bacharach MGD-100 User Guide:

• Bacharach MGD-100, M GD-100 M anual 38 6109-9000 Rev 3 Step Bump Testing U si ng Calibration Gas Cylinders 1 Remove the enclosure li d of the gas sensor and controller (not applicable to Exd Remote sensor and vent pipe m odel as monitoring of voltage can be done on controller). 2 Connect the voltmeter to the channel under test between Pin 4 and Pin 2 (for single-level alarm units), or TP5 and TP 4 (for dual-alarm units), to monitor sensor response. 3 Expose the sensor to gas from the cylinder by using a plastic hose/hood to di rect gas to the sensor head. Figure 17. Gas Cylinder and Test Hardware NOT E: If the bump test is unsuccessful, perform a calibration as described

• Bacharach MGD-100, M GD-100 M anual 6109-9000 Rev 3 5 Section 1. Overview 1.1. General Information The MGD-100 is the ideal gas detection solution for installations requiring a quality and affordable stand-alone gas detector. It consists of 1 to 6 remote gas sensors connected to and powered by a controller. The controller provides visual, audible, and relay alarms on the detection of gases. The system is available with one or two levels of al arm. The MGD-100 can be used for: • detecting refrigerant gases (including NH 3 and CO 2 ) • speedy detection of combustible gases • det

• Bacharach MGD-100, M GD-100 M anual 20 6109-9000 Rev 3 Figure 9. MGD-100 IP66 Housing with Remote Sensor Figure 10. MGS-100 IP66 Housing with Airflow Duct Mount See Figure 8 for mounting locations. Cut out in duct for pitot 22mm

• M GD-100 M anual 2 6109-9000 Rev 3 WARRANTY POLICY BA CHA RA CH, INC. WA RRANTS THIS INSTRUMENT, EXCLUDING SENSORS, TO BE FREE FROM DEFECTS IN MATERIALS AND WORKMANSHIP FOR A PERIOD OF TWO Y EA RS F RO M THE DA TE OF PURCHASE BY THE ORIGINAL OWNER. THE SENSO RS HAVE A WARRANTY PERIOD OF ONE YEAR FROM TH E DA T E O F PU R CHA S E. IF THE PRODUCT S

• Bacharach MGD-100, M GD-100 M anual 34 6109-9000 Rev 3 IMPORT ANT: Before testing the sensors on-site, the MGD- 100 must have been powered up and allowed to stabilize for at least 24 hours. See Section 5. IMPORT ANT: Failure to t est or calibrate t he unit in accordance with applicabl e i nstructions 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 calibration, or inappropriate use of the unit. IMPORT ANT: Bacharach recommends annual checks and gas calibration. B ac

• M GD-100 M anual 6109-9000 Rev 3 43 6.9. Gas Calibration (Two-Alarm Units) NOT E: This calibration procedure is for a two-alarm unit . For one-alarm units, refer to the previous section. NOT E: The delay on a two-alarm system is approximately 25 seconds and cannot be deacti vated. All adjustments are performed on the MGD-100 s

• Bacharach MGD-100, M GD-100 M anual 6109-9000 Rev 3 17 • With air-cooled chillers or air-cooled condensers with non- enclosed condenser sections it is difficult to effecti vely monitor leaks in the coil sections. With some designs it will be possible using an ai rflow sensor to monitor airflow to the start–up fans in the front or rear sections. • If there is a possibility of refrigerant leaks into a duct or air- handling unit install a sensor to monitor the airflow. Weatherproof sensors should be used for unprotected outdoor applications. 2.6. Air Conditioning (Direct Systems VRF/VRV) For compliance with E N378, at least one detector shall be i

• Bacharach MGD-100, M GD-100 M anual 42 6109-9000 Rev 3 First disable the 3-minute alarm delay on a one-alarm system by moving the jumper link at JP1 to the off position. Two adjustments are required and they are both performed on the controller unit. The alarm threshold volt age (A TV ) is the voltage at which the alarm and relay acti vat e at a given gas concentration. This voltage is normally set 3.0V. Step Adjusting the Alarm Threshold Voltage (ATV) 1 This voltage (m easured on the CAL header) is set using: • 1 or 2 channel system controllers - the threshold pot “P3” • 4 or 6 channel system controllers - the threshold pot “P7” If the sensor standby

• Bacharach MGD-100, M GD-100 M anual 6109-9000 Rev 3 31 Section 5. Operation and Stabilization When power to the unit is switched on, there is a 3-minute delay before the system activat es. This all ows the sensors to warm up to the correct temperature for gas detection. • On a two-alarm unit the green light on t he alarm panel comes on after the delay, indicating that the system is ready. • On a one-alarm unit the green light comes on immediately. NOTE: Th e 3-minute delay is set by JP1 in single alarm units only. For 2 a

• Bacharach MGD-100, M GD-100 M anual 6109-9000 Rev 3 33 Section 6. Functional Tests and Calibration 6.1. Introduction To comply with t he requirements of EN378 and the E uropean F-GAS regulation, sensors must be tested annually. However, local regulations may specify the nature and frequency of this test. CAUTION: Check local regulations on c alibration or testing requirements. CAUTION: The MGD-100 contains sensitive electronic components that can be easily damaged. Do not touch nor disturb any of these components. NOT E: Th e MGD-100 is calibrat

• Bacharach MGD-100, M GD-100 M anual 4 6109-9000 Rev 3 Table of Contents SECTION 1. OVERVIEW .............................................................................................. 5 1.1. Gen eral Informati on.......................................................................................... 5 1.2. Technical Specifications..................................................................................10 SECTION 2. PLACING SENSORS ..............................................................................13 2.1. Installation Warnings ......................................................................................13 2.2. Gen eral Gui de

• Bacharach MGD-100, M GD-100 M anual 6109-9000 Rev 3 37 Step Electrical Re set of Two-Alarm Systems 1 For the sens or standby voltage, connect a DC voltmet er between TP 5 (0V ) and TP 4 (+V) as shown in Figure 14 and Figure 16. Adjust pot RV 1. 2 For low-level alarm volt age, connect your DC voltmeter between TP 5 (0V ) and TP 2 (+V) as shown in Figure 14 and Figure 16. Adjust pot P8. 3 For high-level alarm voltage, connect your DC voltmeter between TP 5 (0V ) and TP 1 (+V) as shown in Figure 14 and Figure 16. Adjust pot P7. 6.4. Bump Testing After installation the units should be bump tested. Expose the sensors to test gas a

• Bacharach MGD-100, M GD-100 M anual 6109-9000 Rev 3 23 Section 4. Wiring Instructions 4.1. Wiring MGD-100s Step Wiring MGD-100s 1 Connect a 4-conductor cable (18 AWG recommended) to a terminal block on the MGD-100 controller (CN1, CN2, etc). 2 Rout e the cable to an MGD-100. 3 For standard (IP 41) MGD-100 housings, remove the lid by: • turning the cabl e clamp ½ turn counter clockwise to loosen the internal nut • depressing the clip on top of the enclosure to open. 4 Mount the MGD-100. See Section 3 for dimensions. 5 Connect the other end of the cable t

• Bacharach MGD-100, M GD-100 M anual 6109-9000 Rev 3 15 2.3. Machinery Rooms There is no absolute rule in det ermining t he num ber of sens ors and their locations. However, a number of simple guidelines will help to make a decision. Sens ors monitor a point as opposed to an area. If the gas leak does not reach the sensor then no alarm will be triggered. Therefore, it is extremely important to carefully select the sensor location. Also consider ease of access for maintenance. The size and nature of the site will help to decide which met hod is the most appr

• Bacharach MGD-100, M GD-100 M anual 24 6109-9000 Rev 3 IMPORT ANT: Ensure that connections 1 to 4 on the sensor connect to thei r corresponding numbers on the terminal block in the main control unit, otherwise it could c ause damage to the MGD-100. NOTE: You may use different cables and longer distances provided t he corresponding resistance shown above is not exceeded. 4.2. External Audible Alarm and DC Output NOTE: This section applies to the external audible alarm and the 12 VDC output (4-6 channel systems only). Step Wiring the External Audible Alarm and DC Output 1 To install the audible alarm, connect positive lead to CN9 terminal (for one-a

• Bacharach MGD-100, M GD-100 M anual 6109-9000 Rev 3 11 Specification De s cr ip t io n 1- and 2- channel systems 4- and 6- channel systems Standard Enclosure Ratings MG D-100: IP41 Controller: IP51 MG D-100: IP41 Controller: IP51 Dimensions and Weight: Controller 8.4” x 4.1” x 3.15” 214 x 105 x 80 mm 2.9 lbs / 1.3 kg 10.3” x 10.4” x 303” 262 x 265 x 84 mm 5.7 lbs / 2.6 kg Dimensions and Weights IP41 3.35” x 5.59” x 2.09” 86 x 142 x 53 mm 6.3 oz 180 g IP66 6.89” x 6.5” x 3.29” 175 x 165 x 82 mm 1 lb 6 oz 629 g IP66 w / Splash Guard 6.89” x 8.9” x 3.29” 175 x 225 x 82 mm 1 lb 9 oz 700 g IP66 w / Re mot e Sensor 6.

• Gas Detector and Controllers Installation and Operation Manual Instruction 6109-9000 Revision 3 – June 2013 Product Leadership • Training • Service • Reliability

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