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KEEP THIS MANUAL WITH THE S-2A. Introduction The S-2A vapor-monitoring system utilizes advanced technology for detection of propane (LPG) fuel vapors as well as CNG (Compressed Natural Gas). The S-2A allows the connection of two (2) sensors and has both visual and audible alarms. Test switches are provided for full checking of all operations. System operation and correct sensor operation are continually monitored and indicators are provided for fault detection. The S-2A has an internal relay for automatic control of fuel solenoid. Read this owner’s manual completely before installation. Failure to read and follow these instructions can result in damage to the unit voiding the warranty. Components This Kit Includes • One S-2A Display w/Bezel • Four screws for the display • One SV-1 Solenoid Valve • Two screws for the sensor • One 20 MS-2 Sensor CAUTION: NO POWER ON/OFF SWITCH IS PROVIDED FOR THIS UNIT. TO FUNCTION AS INTENDED, THE S-2A MUST BE CONNECTED TO A CORRECT POWER SOURCE, AND FOR MAXIMUM EFFECTIVENESS, BE POWERED AT ALL TIMES WHILE ABOARD. IF POWER IS ON AND LEFT UNATTENDED FOR AN EXTENDED PERIOD OF TIME, BATTERY POWER MAY BE DIMINISHED. P/N: 18122 Page 1 Rev. 1.0 Rev Date: 9/7/07 Tools Required and Hardware • Screw Drivers (Slotted & Phillips) • Hole Saw 2-1/16” diameter • Electrical Connector Crimping Tool • Two 1 Ampere Fuse With Wire Stripper • Wire Nuts (#16 Gauge Wire) • Power Drill • A Length of #16 Gauge Wire • Electrical Tape • Tape Measure and Pencil • Drill — 3/4 (19.05mm) Diameter • Crescent Wrench • Drill — 1/8” (3-17mm) Diameter • 2 in-Line fuse Holder - Manual Display Controls / Indicator A - Solenoid Valve Indicator B - Sensor #1 Indicator C - Sensor #2 Indicator D - Unit Fault Indicator E - Solenoid Valve On/Off Switch F - Sensor #1 Test Switch C - Sensor #2 Test Switch H - Horn Mute Switch I - Audible Horn (Internal) Indicator Definitions Solenoid Indicator Green = Solenoid Control on Off = Solenoid Control off Sensor #1 & #2 Green = Sensor active, no fumes detected Figure 1 Amber = Sensor failure Red = Fumes detected! alarm condition Flashing Green = Sensor warm up period Off = No sensor detected on power-up Unit Fault Off = Unit Functional Amber = Fault Detected, horn beeping Display Installation The S-2A should be mounted in a convenient location, preferably at the source of propane usage (i.e. galley, heater, etc…) where the visual indicators may be readily seen. To install the display, you must first remove the snap-on bezel by inserting a small, flat blade screwdriver into the slot located on either side of the bezel and carefully prying up until the bezel snaps free. (See figure 5) CAUTION: Do not attempt to remove the four (4) screws, which are now exposed which attach the printed circuit panel to the frame. Doing so will void all warranties. Next, drill a 2-1 /16” diameter hole into the panel. Slip the instrument through the hole and secure, making sure that you have access to the terminals for solenoid valve connections, positive and negative terminal connections and sensor(s) connections. Plug in your sensor to connector one and make positive and negative connections for the display and solenoid valve. Finish the installation by fastening to panel with four screws (provided) and snapping bezel back into place. P/N: 18122 Page 2 Rev. 1.0 Rev Date: 9/7/07 Sensor Installation The sensor supplied with the S-2A includes a standard 20 foot ( 8.29m) cable. If a longer cable is desired contact your dealer or Fireboy-Xintex. Coil excessive cable in a convenient location. Remove the paper covering the adhesive backing on the sensor-mounting surface and press the sensor into position on a previously cleaned surface. Install with two (2) screws provided. CAUTION: Do not attempt to use any other manufacturer’s sensor or previously installed sensors. Figure 2 Sensor Location CAUTION: Propane is heavier than air and will settle. Therefore it is important that a location be selected that is as low as practical and as near the appliance as is possible. Keep sensor dry. CNG (Compressed Natural Gas) is lighter than air and will rise. Therefore, it is important that a location be selected that is within nine (9”) inches (22.86cm) of the ceiling height. Do not locate sensor directly over cooking or heating appliances. Keep sensor dry. Solenoid Installation Propane (LPG) — Mount the solenoid in-line on the tank side of the LPG regulator as close to the tank as is practical. The tank itself should be mounted outside the cabin or crew quarters to avoid the possibility of gas accumulation due to a leak between the tank and the solenoid valve. CNG — Because of the high tank pressure of CNG, the solenoid valve MUST be installed after the CNG regulator and as close to the regulator as practical. The tank and regulator should be mounted outside the cabin or crew quarters to avoid the possibility of gas accumulation due to a leak between the tank and the solenoid valve, NOTE: DO NOT over-tighten fitti...