INSTALLATION AND MAINTENANCE INSTRUCTIONS EPS40EXP and EPS120EXP Explosion Proof Supervisory Pressure Switches 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 2.5A @ 6/12/24 VDC Operating Temperature Range: –40°F to +160°F EPS40EXP EPS120EXP Maximum Service Pressure (in PSI): 250 250 Adjustment Range: 10-100 10-200 Approximate Differential: 3 PSI @ 10 PSI 3 PSI @ 10 PSI 8 PSI @ 100 PSI 9 PSI @ 200 PSI Enclosure Rating: NEMA Type 4 — Indoor/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 Important Please Read Carefully and Save This instruction manual contains important information about the installation and operation of supervisory pressure switches. Purchasers who install switches for use by others must leave this manual or a copy of it with the user. Operation As pressure changes, a diaphragm actuates 2 snap action switches. The pressure switch actuation is determined by adjustment settings. Figure 1. Pressure switch basic dimensions: Read all instructions carefully before installation, following only those instructions that apply to the model you are installing. 4.9" Before installing any alarm device, be thoroughly familiar with: NFPA 72: NFPA 13: NFPA 25: HEX ADJUST SCREW 1/4" HEX HEAD COVER National Fire Alarm Code Installation of Sprinkler Systems Inspection, Testing, and Maintenance of Waterbased Fire Protection Systems COVER TAMPER SET SCREW (WRENCH PROVIDED) Other applicable NFPA standards, local codes, and the requirements of the authority having jurisdiction. ADJUSTMENT WHEEL 9.5" COVER (WRENCH PROVIDED) 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. LOCKING SCREW MAIN ADJUSTMENT WHEEL (TURN COUNTERCLOSKWISE TO INCREASE PRESSURE) 1/2" NPT D770-26-00 1 I56-1428-001R Figure 2. Typical piping diagram for EPS40EXP EPS40EXP WIRE TO SUPERVISORY CIRCUIT OF FIRE ALARM CONTROL PANEL EPS10EXP Figure 3. Typical piping diagram for EPS120EXP WIRE TO ALARM INDICATING CIRCUIT OF FIRE ALARM CONTROL PANEL AIR PRESSURE SUPPLY EPS120EXP TO SPRINKLER SYSTEM CHECK VALVE INSTALL BLEEDER VALVE FOR TESTING DRY PIPE VALVE AIR LINE SHUT-OFF VALVE OS & Y VALVE CHECK VALVE WATER BY-PASS TEST VALVE WATER MOTOR GONG BLEEDER TEST VALVE WATER MOTOR GONG WET SYSTEM ALARM CHECK VALVE LOCAL ALARM SHUT OFF VALVE OS & Y VALVE DRY SYSTEM RETARD OS & Y VALVE WATER BY-PASS VALVE LOCAL ALARM SHUT OFF VALVE A78-2397-00 A78-2398-02 b. Apply tightening torque to the brass hex portion of the device. 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. 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. 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 position; side mounting is also acceptable. Locate it where vibration, shock, and mechanical loading are minimal. Refer to piping diagram above (Figures 2 and 3). 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. Figure 4. Switch location: 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 4 and Table 1). Table 1. Electrical connections (referenced at factory settings): COMMON MODELS EPS40EXP, EPS120EXP SWITCHES AT LOW TRIP POINT B B COM COM A A SW1 SW2 TERMINAL SWITCH #1 (HIGH SWITCH) SWITCH #2 (LOW SWITCH) SWITCHES AT NORMAL SYSTEM PRESSURE B COM A TERMINAL “B” B COM A SW1 GROUND SCREW SW2 SWITCHES AT HIGH TRIP POINT B COM A B COM A SW1 SW2 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 D770-26-00 2 I56-1428-001R Adjustments To Factory Settings 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 and Supervisory Pressure Switches. Always refer to the Installation and Maintenance Instruction for specific recommendations on individual devices before installing the unit. Table 2. FACTORY SETTINGS ( PSI) MODEL Fall Sw2 (Low Switch) Nominal Rise Sw1 (Hi Switch) EPS40EXP 30 ± 1.5 40 50 ± 2.5 EPS120EXP 101.5 - 112.5 115 117.5 - 128.5 • Electrical ratings stated in literature and on nameplates should not be exceeded. Dual-switch Model — EPS40EXP and EPS120EXP 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. Option 1: To adjust the nominal setting of the pressure window (low switch setting to high switch setting) without affecting the size of the window, adjust the main adjustment wheel, Figure 1, to the desired setting using the pressure source to verify each switch setting. Each tine on the wheel represents an approximate window shift of 1.8 PSI for the EPS40EXP and 6.6 PSI for the EPS 120EXP. For each 1/2 rotation of the adjustment wheel, the window changes by approximately 11 PSI for the EPS 40EXP and 40 PSI for the EPS 120EXP. • 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. Option 2: To adjust the pressure window size and the nominal setting of the pressure window, adjust the main adjustment wheel, Figure 1, until the high switch (SW1) trips at the desired pressure using the pressure test source. Decrease the pressure until the low switch (SW2) trips. Note pressure and determine how much change is desired on the low switch. Adjust the 1/4″ hex screw, Figure 1, to either increase (counterclockwise) or decrease (clockwise) the window size. (The low switch will be affected.) The approximate sensitivity of the hex screw adjustment: 1/2 turn = 5 PSI. An approximate maximum window size of 30 PSI is obtainable. Retest the high switch after adjusting the low switch. 4. Retest the set points several times to ensure the accuracy of the settings. 5. Re-seat locking screw. 6. Re-install adjustment wheel cover. D770-26-00 • Do not mount unit where ambient temperatures will exceed published limits. • Avoid impact or mechanical loading. 3 I56-1428-001R 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. D770-26-00 4 I56-1428-001R © System Sensor 2002