System Sensor EPS40EXP and EPS120EXP Manual

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INSTALLATION AND MAINTENANCE INSTRUCTIONS and EPS120EXP Explosion Proof Pressure Switches Ohio Avenue St Charles Illinois 60174 FAX 630 377 6495 Ratings Temperature Range Service Pressure in PSI 250 Range Differential Rating Atmospheres A 1 2 HP 125 250 VAC 6 12 24 VDC to 160 PSI 10 PSI PSI 200 PSI PSI 10 PSI PSI 100 PSI Type 4 Indoor Outdoor use I Groups B C D Div 1 II Groups E F G Div 1 III Div 1 Read Carefully and Save instruction manual contains important information the installation and operation of supervisory pres switches Purchasers who install switches for use by must leave this manual or a copy of it with the user all instructions carefully before installation following those instructions that apply to the model you are pressure changes a diaphragm actuates 2 snap action The pressure switch actuation is determined by settings 1 Pressure switch basic dimensions installing any alarm device be thoroughly familiar 72 National Fire Alarm Code 13 25 of Sprinkler Systems Testing and Maintenance of Water Fire Protection Systems applicable NFPA standards local codes and the of the authority having jurisdiction to follow these directions may result in failure of the to report an alarm condition System Sensor is not for devices that have been improperly installed or maintained ADJUST HEX HEAD SCREW ADJUSTMENT TURN INCREASE NPT 2 Typical piping diagram for EPS40EXP 3 Typical piping diagram for EPS120EXP TO SUPERVISORY OF FIRE ALARM PANEL TO ALARM CIRCUIT FIRE ALARM PANEL FOR Y SYSTEM ALARM OFF LINE Y Y ALARM OFF device Apply tightening torque to the brass hex portion of prevent ignition of hazardous atmospheres disconnect before removing cover Keep cover closed while cir are live Conduit runs must have sealing fittings con within 18 of the enclosure Back out cover tamper set screw and remove cover Fig 1 Mounting the Switch device is designed to be mounted in the upright posi side mounting is also acceptable Locate it where shock and mechanical loading are minimal to piping diagram above Figures 2 and 3 Mount the device directly to the line via the 1 2 NPT connection The use of teflon pipe sealant is recommended Be sure the fitting is tight to prevent leaks 4 Switch location voltage Electrocution hazard Do not handle live AC or work on a device to which AC power is applied so may result in severe injury or death Wire the device in accordance with the National Code Two 1 2 NPT conduit entry holes have provided in the mounting base to accept explosion conduit fittings If necessary remove conduit entry with 3 8 square wrench Connect wiring to terminals see Figure 4 and Table 1 1 Electrical connections referenced at settings 1 SWITCH 2 SWITCH EPS40EXP EPS120EXP AT LOW TRIP POINT AT NORMAL SYSTEM PRESSURE AT HIGH TRIP POINT WIRE AS SHOWN FOR OF CONNECTION NOT ALLOW STRIPPED WIRE TO EXTEND BEYOND HOUSING DO NOT WIRES To Factory Settings 2 SETTINGS PSI Sw2 Nominal Rise Sw1 Switch Switch 30 1.5 40 50 2.5 101.5 112.5 115 117.5 128.5 The sensor assembly is not field replaceable Do attempt to disassemble these parts If you have questions consult System Sensor System recommends careful consideration of the factors when specifying and installing and Supervisory Pressure Switches Always and Maintenance for specific recommendations on indi devices before installing the unit Electrical ratings stated in literature and on name should not be exceeded Overload on switch can cause failure on the first Always wire devices according to national and electrical codes Install units away from shock and vibration Proper fittings should be used to prevent moisture entering the enclosure via the conduit Test all devices for proper operation after initial instal Perform preventive maintenance and periodic as required by the applicable NFPA standards not less than bi monthly Install a back up control for all critical applications control failure could endanger life or property backup control to serve as a high or low limit con is especially recommended for applications where runaway condition could result Do not mount unit where ambient temperatures will published limits Avoid impact or mechanical loading Model EPS40EXP and EPS120EXP Install pressure switch as stated in of instruction manual Attach pressure test to system Remove adjustment wheel cover and back off locking see Figure 1 to allow main adjustment wheel to freely Option 1 To adjust the nominal setting of the pressure low switch setting to high switch setting affecting the size of the window adjust the adjustment wheel Figure 1 to the desired setting the pressure source to verify each switch setting tine on the wheel represents an approximate win shift of 1.8 PSI for the EPS40EXP and 6.6 PSI for the 120EXP For each 1 2 rotation of the adjustment the window changes by approximately 11 PSI for EPS 40EXP and 40 PSI for the EPS 120EXP 2 To adjust the pressure window size and the setting of the pressure window adjust the main wheel Figure 1 until the high switch SW1 at the desired pressure using the pressure test Decrease the pressure until the low switch trips Note pressure and determine how much is desired on the low switch Adjust the 1 4 hex Figure 1 to either increase counterclockwise or clockwise the window size The low switch be affected The approximate sensitivity of the hex adjustment 1 2 turn 5 PSI An approximate window size of 30 PSI is obtainable Retest high switch after adjusting the low switch Retest the set points several times to ensure the accura of the settings Re seat locking screw Re install adjustment wheel cover refer to insert for the Limitations of Fire Alarm Systems Limited Warranty Sensor warrants its enclosed pressure switch to be free from in materials and workmanship under normal use and service for a of three years from date of manufacture System Sensor makes no express warranty for this pressure switch No agent representative or employee of the Company has the authority to increase or alter obligations or limitations of this Warranty The Company obligation this Warranty shall be limited to the repair or replacement of any part the pressure switch which is found to be defective in materials or work under normal use and service during the three year period com with the date of manufacture After phoning System Sensor toll number 800 SENSOR2 736 7672 for a Return Authorization number defective units postage prepaid to System Sensor Return RA

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