System Sensor EPS40EXP, EPS120EXP User Manual

4.9"
9.5"
LOCKING SCREW
HEX ADJUST SCREW 1/4" HEX HEAD
COVER TAMPER SET SCREW (WRENCH PROVIDED)
ADJUSTMENT WHEEL COVER (WRENCH PROVIDED)
MAIN ADJUSTMENT WHEEL (TURN COUNTERCLOSKWISE TO INCREASE PRESSURE)
1/2" NPT
D770-26-00 1 I56-1428-001R
EPS40EXP and EPS120EXP Explosion Proof Supervisory Pressure Switches
INSTALLATION AND MAINTENANCE INSTRUCTIONS
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
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.
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
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:
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
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.
A78-2397-00
Figure 3. Typical piping diagram for EPS120EXP
DRY PIPE VALVE
OS & Y VALVE
WATER
BY-PASS
TEST
VALVE
LOCAL ALARM
SHUT OFF
VALVE
WATER MOTOR GONG
CHECK VALVE
EPS40EXP
CHECK VALVE
AIR LINE SHUT-OFF VALVE
INSTALL BLEEDER VALVE FOR TESTING
EPS10EXP
DRY SYSTEM
WIRE TO SUPERVISORY CIRCUIT OF FIRE ALARM CONTROL PANEL
WIRE TO ALARM INDICATING CIRCUIT OF FIRE ALARM
CONTROL PANEL TO SPRINKLER SYSTEM
Table 1. Electrical connections (referenced at factory settings):
b. Apply tightening torque to the brass hex portion of
the device.
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.
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).
CAUTION
WET SYSTEM ALARM CHECK VALVE
OS & Y VALVE
OS & Y VALVE
WATER
BY-PASS
VALVE
AIR
PRESSURE
SUPPLY
BLEEDER
TEST
VALVE
EPS120EXP
LOCAL ALARM
SHUT OFF
VALVE
RETARD
WATER MOTOR GONG
A78-2398-02
COMMON
TERMINAL
SWITCH #2 (LOW SWITCH)
TERMINAL “B”
GROUND SCREW
Figure 4. Switch location:
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.
SWITCH #1
(HIGH SWITCH)
Figure 2. Typical piping diagram for EPS40EXP
SW2SW1
SWITCHES AT NORMAL SYSTEM PRESSURE
SWITCHES AT LOW TRIP POINT
SW1 SW2
MODELS EPS40EXP, EPS120EXP
SWITCHES AT HIGH TRIP POINT
SW1 SW2
B
COM
A
B
COM
A
B
COM
A
A
COM
B
A
COM
B
A
COM
B
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