System Sensor EPS40, EPS40-2, EPS120-1, EPS120-2 User Manual

HEX ADJUSTMENT SCREW

MAIN ADJUSTMENT WHEEL

4-1/4"

5-1/8"

LOCKING SCREW

1/2" NPT

COM

GROUND SCREW (GREEN)

SWITCH #2

INSTALLATION AND MAINTENANCE INSTRUCTIONS

CAUTION

WARNING

I56-0986-008R

EPS40 Series and EPS120 Series Supervisory Pressure Switches

SPECIFICATIONS

Contact Ratings: 10 A, 1/2 HP @ 125/250 VAC 8A @ 125/250 VAC ~ (LPCB ONLY)

2.5A @ 6/12/24 VDC Overall Dimensions: See Figure 1 Operating Temperature Range: –40°F to +160°F Maximum Service Pressure: EPS40-1, EPS40-2: 300 PSI EPS120-1, EPS120-2: 300 PSI Adjustment Range: EPS40-1, EPS40-2: 10-100 PSI EPS120-1, EPS120-2: 10-200 PSI Enclosure Rating: UL 4x — Indoor or Outdoor Use NEMA 4 — Indoor or Outdoor Use IP54 Approximate Differential: EPS40-1, EPS40-2: 3 PSI at 10 PSI 6 PSI at 100 PSI EPS120-1, EPS120-2: 3 PSI at 10 PSI 9 PSI at 200 PSI

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 Protec-

tion 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.

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

www.systemsensor.com

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:

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 con-

nection. 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.

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D770-17-00 1 I56-0986-008R

GROUND SCREW

COM

COMMON TERMINALS

BREAK WIRE AS SHOWN FOR SUPERVISION OF CONNECTION. DO NOT ALLOW STRIPPED WIRE LEADS TO EXTEND BEYOND SWITCH HOUSING. DO NOT LOOP WIRES.

SWITCH #1

SWITCH #2

LOCKING SCREW

TERMINAL “A”

TERMINAL “B”

FACTORY SETTINGS (PSI)

MODEL

Fall SW2

(Low Switch)

Rise SW1

(Hi Switch)

Nominal

EPS40-1 EPS40-2

EPS120-1 EPS120-2

30± 1.5 30± 1.5

––115

101.5 - 112.5

101.5 - 112.5 117.5 - 128.5115

––40

50± 2.540

FIGURE 3. TYPICAL PIPING DIAGRAM FOR EPS120-1, EPS120-2FIGURE 2. TYPICAL PIPING DIAGRAM FOR EPS40-1, EPS40-2

DRY PIPE VALVE

OS & Y VALVE

WATER

BY-PASS

TEST

VALVE

LOCAL ALARM

SHUT OFF

VALVE

WATER MOTOR GONG

CHECK VALVE

EPS40

CHECK VALVE

AIR LINE SHUT-OFF VALVE

INSTALL BLEEDER VALVE FOR TESTING

EPS10

DRY SYSTEM

WIRE TO SUPERVISORY CIRCUIT OF FIRE ALARM CONTROL PANEL

WIRE TO ALARM INDICATING CIRCUIT OF FIRE ALARM

CONTROL PANEL TO SPRINKLER SYSTEM

WET SYSTEM ALARM CHECK VALVE

OS & Y VALVE

WATER

BY-PASS

VALVE

AIR

PRESSURE

SUPPLY

BLEEDER

TEST

VALVE

EPS120

LOCAL ALARM

SHUT OFF

VALVE

RETARD

WATER MOTOR GONG

C0141-01

C0142-01

TABLE 2.

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

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:

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 pres-

sure 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

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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

SWITCH AT NORMAL SYSTEM PRESSURE

COM

SWITCH AT TRIP POINT

COM

SWITCH 1

MODELS EPS40-2, EPS120-2

SWITCHES AT LOW TRIP POINT

COM

SW1 SW2

SWITCHES AT NORMAL SYSTEM PRESSURE

COM

SWITCHES AT HIGH TRIP POINT

COM

SW1 SW2

COM

SW2SW1

W0186-00

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