INSTALLATION AND MAINTENANCE INSTRUCTIONS
EPS40 Series and EPS120 Series
Supervisory Pressure Switches
SPECIFICATIONS |
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Contact Ratings: |
10 A, 1/2 HP @ 125/250 VAC |
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8A @ 125/250 VAC ~ (LPCB ONLY) |
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2.5A @ 6/12/24 VDC |
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Overall Dimensions: |
See Figure 1 |
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Operating Temperature Range: |
–40°F to +160°F |
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Maximum Service Pressure: |
EPS40-1, EPS40-2: |
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300 PSI |
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EPS120-1, EPS120-2: |
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300 PSI |
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Adjustment Range: |
EPS40-1, EPS40-2: |
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10-100 PSI |
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EPS120-1, EPS120-2: |
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10-200 PSI |
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Enclosure Rating: |
UL 4x — Indoor or Outdoor Use |
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NEMA 4 — Indoor or Outdoor Use |
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IP54 |
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Approximate Differential: |
EPS40-1, EPS40-2: |
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PSI at 10 PSI |
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6 |
PSI at 100 PSI |
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EPS120-1, EPS120-2: |
3 |
PSI at 10 PSI |
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9 |
PSI at 200 PSI |
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008R-0986-I56
3825 Ohio Avenue, St. Charles, Illinois 60174 1-800-SENSOR2, FAX: 630-377-6495 www.systemsensor.com
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.
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: National Fire Alarm Code NFPA 13: Installation of Sprinkler Systems
NFPA 25: Inspection, Testing, and Maintenance of Water-based Fire Protection Systems
NFPA 13D: Standard for 1 and 2 Family Dwellings and Manufactured Homes NFPA 13R: Standard for Multi-family Dwellings
Other applicable NFPA standards, local codes, and the requirements of the authority having jurisdiction.
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.
CAUTION
Do not use in potentially explosive atmospheres.Do not leave unused wires exposed.
OPERATION
As pressure changes, a diaphragm actuates 1 or 2 snap action switches. The pressure switch actuation is determined by adjustment settings.
INSTALLATION
1.Remove Cover
Cover is held on by two screws.
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 (Fig. 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.
b.Apply tightening torque to the black plastic hex portion of the device.
WARNING
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. When utilizing switches at voltages greater than 74 VDC 
or 49 VAC , means to provide all-pole disconnection must be incorporated in the field wiring, such as a circuit breaker.
3.Wire the device in accordance with the National Electrical Code. Two 7/8″ diameter conduit connection holes have been provided in the mounting plate to accept standard 1⁄2″ conduit fittings (one is removable knock-out type). If a NEMA 4/UL 4x (waterproof unit) is required, waterproof flexible metallic conduit and appropriate conduit fittings must be used. Recommended connectors are Thomas and Betts PN 5332 (180° coupling), PN 5352 (90° coupling), and PN 5262 seal ring.
4.Connect wiring to terminals (see Figure 4 and Table 1).
Adjustments to Factory Settings
FIGURE 1. PRESSURE SWITCH BASIC DIMENSIONS:
4-1/4"
COM
A
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SWITCH #2 |
HEX |
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GROUND |
B |
ADJUSTMENT |
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SCREW |
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SCREW |
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(GREEN) |
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5-1/8"
MAIN ADJUSTMENT WHEEL
LOCKING SCREW
1/2" NPT
W0170-00
D770-17-00 |
1 |
I56-0986-008R |
FIGURE 2. TYPICAL PIPING DIAGRAM FOR EPS40-1, EPS40-2
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WIRE TO SUPERVISORY |
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WIRE TO ALARM |
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EPS40 |
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CIRCUIT OF FIRE ALARM |
EPS10 |
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INDICATING CIRCUIT |
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CONTROL PANEL |
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OF FIRE ALARM |
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TO |
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CONTROL PANEL |
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SPRINKLER |
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DRY |
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SYSTEM |
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INSTALL |
PIPE |
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CHECK |
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VALVE |
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CHECK |
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BLEEDER |
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VALVE |
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WATER |
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VALVE FOR |
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VALVE |
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TESTING |
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MOTOR |
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GONG |
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AIR LINE |
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SHUT-OFF |
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VALVE |
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WATER |
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LOCAL ALARM |
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OS & Y |
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BY-PASS |
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SHUT OFF |
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VALVE |
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TEST |
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VALVE |
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VALVE |
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DRY SYSTEM |
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C0141-01 |
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TABLE 2. |
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MODEL |
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FACTORY SETTINGS (PSI) |
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Fall SW2 |
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Nominal |
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Rise SW1 |
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(Low Switch) |
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(Hi Switch) |
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EPS40-1 |
30± 1.5 |
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40 |
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–– |
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EPS40-2 |
30± 1.5 |
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40 |
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50± 2.5 |
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EPS120-1 |
101.5 - 112.5 |
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115 |
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–– |
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EPS120-2 |
101.5 - 112.5 |
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115 |
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117.5 - 128.5 |
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SINGLE-SWITCH MODEL — EPS40-1 AND EPS120-1
1.Install pressure switch as stated in “INSTALLATION” portion of instruction manual. Attach pressure test source to system.
2.Back off locking screw (see Fig. 4) to allow main adjustment wheel to rotate freely.
3.Test the switch for the set point by introducing 40 PSI pressure from the pressure test source for the EPS40-1 (115 PSI for the EPS120-1). Decrease pressure slowly until the switch trips. Rotate main adjustment wheel, Figure 5, (counterclockwise to increase pressure) and retest by first introducing a higher pressure than desired and slowly reducing pressure until the switch trips. Repeat process until switch trip point is at desired pressure setting. Each number represents an approximate trip point change of 1.8 PSI for the EPS40-1 and 6.6 PSI for the EPS120-1. For each 1/2 rotation of the adjustment wheel, the trip point setting changes by approximately 11 PSI for the EPS40-1 and 40 PSI for the EPS120-1.
4.Retest the set point several times to ensure accuracy of setting.
5.Re-seat locking screw.
FIGURE 4. SWITCH LOCATION:
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COMMON |
SWITCH #1 |
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TERMINALS |
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TERMINAL “A” |
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M |
SWITCH #2 |
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CO |
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2 |
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A |
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# |
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H |
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C |
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SW |
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B |
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TERMINAL “B”
GROUND
SCREW
LOCKING
SCREW
BREAK WIRE AS SHOWN FOR
SUPERVISION OF CONNECTION.
DO NOT ALLOW STRIPPED WIRE
LEADS TO EXTEND BEYOND
SWITCH HOUSING. DO NOT
LOOP WIRES.
FIGURE 3. TYPICAL PIPING DIAGRAM FOR EPS120-1, EPS120-2
AIR |
EPS120 |
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PRESSURE |
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SUPPLY |
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BLEEDER |
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WATER |
TEST |
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MOTOR |
VALVE |
WET |
GONG |
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SYSTEM |
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ALARM |
RETARD |
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CHECK |
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VALVE |
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WATER |
LOCAL ALARM |
OS & Y |
OS & Y |
BY-PASS |
SHUT OFF |
VALVE |
VALVE |
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VALVE |
VALVE |
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C0142-01 |
DUAL-SWITCH MODEL — EPS40-2 AND EPS120-2
1.Install pressure switch as stated in “INSTALLATION” portion of instruction manual. Attach pressure test source to system.
2.Back out the locking screw (see Fig. 4) to allow main adjustment wheel to turn freely.
3.Option 1: Adjust nominal pressure setting without affecting PSI window.
a)Adjust main adjustment wheel (see Fig. 5) to desired setting using pressure source (i.e., valve or air maintenance device).
b)Turn main adjustment wheel counterclockwise to increase (see arrow on mounting base) or clockwise to decrease pressure. Each number on main adjust wheel represents an approximate window shift of 1.8 psi for EPS40-2 and 6.6 psi for EPS120-2. For each 1/2 rotation of the adjustment wheel the window changes by approximately 11 psi for EPS40-2 and 40 psi for EPS120-2.
c)Retest the set point several times to ensure the accuracy of the setting.
Option 2: Adjust pressure window size and nominal setting of pressure window.
a)Adjust main adjustment wheel (see Fig. 5) until high switch (SW1) trips at desired pressure using pressure test source (valve or air maintenance device).
b)Refer to step B from Option 1.
c)Decrease pressure until the low switch trips (SW2).
d)Adjust 1/4˝ low pressure hex head nut (see Fig. 5) to either increase (counterclockwise) or decrease (clockwise) the window size (the low switch will be affected).
e)The approximate sensitivity of the hex screw adjustment: 1/2 turn =5 psi. A maximum of 30 psi is attainable.
4.Retest the set points several times to ensure the accuracy of the settings, and adjust as necessary.
5.Re-seat locking screw.
NOTE: EPS40 models are able to be set to a range within 8-100psi only when used with Victaulic series 768 and 769 FireLock NXT valves pre-set for use with low pressure actuators. When used on Victaulic series 768 and 769 FireLock NXT all units must be 100% tested to verify pressure setting. Both the main adjustment wheel and low pressure adjusting screw (See Figure 5) need to be customer set and tested to insure proper functionality. For pressure setting instructions refer to Installation section for dual switch models in this manual.
TABLE 1. ELECTRICAL CONNECTIONS (REFERENCED AT FACTORY SETTINGS):
MODELS EPS40-1, EPS120-1 |
MODELS EPS40-2, EPS120-2 |
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SWITCH AT NORMAL SYSTEM PRESSURE |
SWITCHES AT LOW TRIP POINT |
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B |
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B |
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COM |
COM |
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COM |
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A |
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SW1 |
SW2 |
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SWITCH AT TRIP POINT |
SWITCHES AT NORMAL SYSTEM PRESSURE |
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B |
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B |
B |
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COM |
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A |
COM |
COM |
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A |
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SWITCH 1 |
SW1 |
SW2 |
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SWITCHES AT HIGH TRIP POINT |
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B |
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COM |
COM |
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A |
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SW1 |
SW2 |
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W0186-00
D770-17-00 |
2 |
I56-0986-008R |
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