INSTALLATION AND MAINTENANCE INSTRUCTIONS EPS10EXP Explosion Proof Alarm Pressure Switch 3825 Ohio Avenue, St. Charles, Illinois 60174 1-800-SENSOR2, FAX: 630-377-6495 www.systemsensor.com Specifications Contact Ratings: 10 A, 1/2 HP @ 125/250 VAC 2.5 A @ 6/12/24 VDC Operating Temperature Range: –40° F to +160°F Maximum Service Pressure: 250 PSI Maximum Adjustment Range: 4 – 20 PSI Enclosure Rating: NEMA Type 4 — Indoor or/Outdoor Use Hazardous Atmospheres Classification: Class I, Groups B, C, D, Div. 1 Class II, Groups E, F, G, Div. 1 Class III, Div. 1 Approximate Differential: 3 PSI throughout range Important Please Read Carefully and Save This instruction manual contains important information about the installation and operation of alarm pressure switches. Purchasers who install switches for use by others must leave this manual or a copy of it with the user. WARNING To prevent ignition of hazardous atmospheres, disconnect circuits before removing cover. Keep cover closed while circuits are live. Conduit runs must have sealing fittings connected within 18” of the enclosure. Installation 1. Back out cover tamper set screw and remove cover (Fig. 1). 2. Mounting the Switch The device is designed to be mounted in the upright or horizontal position; side mounting is also acceptable. Read all instructions carefully before installation, following only those instructions that apply to the model you are installing. Before installing any alarm device, be thoroughly familiar with: NFPA 72: Installation, Maintenance, and Use of Protective Signaling Systems NFPA 13: Installation of Sprinkler Systems Figure 1. Pressure switch basic dimensions: 4.9" Other applicable NFPA standards, local codes, and the requirements of the authority having jurisdiction. HEX ADJUST SCREW 1/4" HEX HEAD COVER Failure to follow these directions may result in failure of the device to report an alarm condition. System Sensor is not responsible for devices that have been improperly installed, tested, or maintained. COVER TAMPER SET SCREW (WRENCH PROVIDED) ADJUSTMENT WHEEL 9.5" COVER (WRENCH PROVIDED) Operation As pressure changes, a diaphragm actuates 2 snap action switches. The pressure switch actuation is determined by adjustment settings. LOCKING SCREW MAIN ADJUSTMENT WHEEL (TURN COUNTERCLOSKWISE TO INCREASE PRESSURE) 1/2" NPT D770-25-00 1 I56-1427-001R Figure 2. Typical piping diagram for EPS10EXP EPS10EXP WIRE TO ALARM INDICATING CIRCUIT OF FIRE ALARM CONTROL PANEL EPS10EXP TO SPRINKLER SYSTEM WET SYSTEM ALARM CHECK VALVE OS & Y VALVE TO SPRINKLER SYSTEM WATER MOTOR GONG RETARD WATER BY-PASS VALVE LOCAL ALARM SHUT OFF VALVE EPS10EXP LOCAL ALARM SHUT OFF VALVE WET SYSTEM CHECK VALVE DRY SYSTEM ALARM CHECK VALVE RETARD WATER BY-PASS VALVE WIRE TO ALARM INDICATING CIRCUIT OF FIRE ALARM CONTROL PANEL TO SPRINKLER SYSTEM WATER MOTOR GONG WET SYSTEM ALARM CHECK VALVE OS & Y VALVE WIRE TO ALARM INDICATING CIRCUIT OF FIRE ALARM CONTROL PANEL WATER MOTOR GONG WATER BY-PASS VALVE OS & Y VALVE WET SYSTEM LOCAL ALARM SHUT OFF VALVE DRY SYSTEM A78-2398-00 Table 1. Electrical connections (referenced at factory settings): Locate it where vibration, shock, and mechanical loading are minimal. Refer to piping diagram (Figure 2 on page 2). a. Mount the device directly to the line via the 1/2" NPT pressure connection. The use of teflon pipe sealant tape is recommended. Be sure the fitting is tight enough to prevent leaks. b. Apply tightening torque to the brass hex portion of device. MODEL EPS10EXP SWITCHES AT 0 P.S.I. B COM A B COM A SW1 SW2 SWITCHES AT 4-8 P.S.I. (HIGH TRIP PT.) B B COM COM A A SW1 SW2 CAUTION High voltage. Electrocution hazard. Do not handle live AC wiring or work on a device to which AC power is applied. Doing so may result in severe injury or death. BOTH SWITCHES ACTIVATE SIMULTANEOUSLY Figure 3. Switch terminals: 3. Wire the device in accordance with the National Electrical Code. Two 1/2” NPT conduit entry holes have been provided in the mounting base to accept explosion proof conduit fittings. If necessary, remove conduit entry plug with 3/8” square wrench. 4. Connect wiring to terminals (see Figure 3 and Table 1). COMMON TERMINALS TERMINAL “A” SWITCH #1 SWITCH #2 TERMINAL “B” Adjustments To Factory Settings GROUND SCREW (GREEN) BREAK WIRE AS SHOWN FOR SUPERVISION OF CONNECTION. DO NOT ALLOW STRIPPED WIRE LEADS TO EXTEND BEYOND SWITCH HOUSING. DO NOT LOOP WIRES. A78-2346-02 D770-25-00 2 I56-1427-001R NOTE: The sensor assembly is not field replaceable. Do not attempt to disassemble these parts. If you have any questions, consult System Sensor. System Sensor recommends careful consideration of the following factors when specifying and installing Alarm Pressure Switches. Always refer to the Installation and Maintenance Instruction for specific recommendations on individual devices before installing the unit. The EPS10EXP device is pre-adjusted at the factory to alarm at 4–8 PSI on rising pressure (see Table 2). Pressure switch settings may be adjusted in the field to obtain a different pressure alarm response from 4 PSI to 20 PSI. The switch has an override feature on the adjustment mechanism to prevent exceeding the 20 PSI max. setting of the switch. This override feature carries with it a tolerance band that may limit the upper adjustment to 16–20 PSI. Care must be used when setting the switch to ensure that the lower limit of 4 PSI is not exceeded. This will allow the switch to reset within the 3 PSI differential stated. 1. Install pressure switch as stated in “INSTALLATION” portion of instruction manual. Attach pressure test source to system. 2. Remove adjustment wheel cover and back off locking screw (see Figure 1) to allow main adjustment wheel to rotate freely. 3. Test trip point by slowly introducing pressure from the pressure test source. When trip point is found, reduce pressure to zero. Rotate main adjustment wheel (counterclockwise to increase pressure) and retest until switch trip point is at the desired pressure setting (4–20 PSI range). Each tine on the wheel represents an approximate trip point change of 0.2 PSI. One full rotation changes the trip point setting by approximately 2.5 PSI. A reset differential of approximately 3 PSI is typical throughout the entire adjustment range of switch. 4. Retest the set point several times to ensure accuracy of setting. 5. Re-seat locking screw. 6. Re-install adjustment wheel cover. • Electrical ratings stated in literature and on nameplates should not be exceeded. • Overload on switch can cause failure on the first cycle. Always wire devices according to national and local electrical codes. • Install units away from shock and vibration. Proper electrical fittings should be used to prevent moisture from entering the enclosure via the conduit. • Test all devices for proper operation after initial installation. Perform preventive maintenance and periodic testing as required by the applicable NFPA standards but not less than bi-monthly. • Install a back-up control for all critical applications where control failure could endanger life or property. A backup control to serve as a high or low limit control is especially recommended for applications where a runaway condition could result. • Do not mount unit where ambient temperatures will exceed published limits. Table 2. MODEL EPS10EXP D770-25-00 FACTORY SETTINGS (PSI) Approx. Reset Rise 4—8 3 PSI Diff. • Avoid impact or mechanical loading. 3 I56-1427-001R Please refer to insert for the Limitations of Fire Alarm Systems Three-Year Limited Warranty System Sensor warrants its enclosed pressure switch to be free from Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174. defects in materials and workmanship under normal use and service for a Please include a note describing the malfunction and suspected cause of period of three years from date of manufacture. System Sensor makes no failure. The Company shall not be obligated to repair or replace units other express warranty for this pressure switch. No agent, representative, which are found to be defective because of damage, unreasonable use, dealer, or employee of the Company has the authority to increase or alter modifications, or alterations occurring after the date of manufacture. In no the obligations or limitations of this Warranty. The Company’s obligation case shall the Company be liable for any consequential or incidental damof this Warranty shall be limited to the repair or replacement of any part ages for breach of this or any other Warranty, expressed or implied whatof the pressure switch which is found to be defective in materials or worksoever, even if the loss or damage is caused by the Company’s negligence manship under normal use and service during the three year period comor fault. Some states do not allow the exclusion or limitation of incidental mencing with the date of manufacture. After phoning System Sensor’s toll or consequential damages, so the above limitation or exclusion may not free number 800-SENSOR2 (736-7672) for a Return Authorization number, apply to you. This Warranty gives you specific legal rights, and you may send defective units postage prepaid to: System Sensor, Return also have other rights which vary from state to state. D770-25-00 4 I56-1427-001R © System Sensor 2002