System Sensor EPS10EXP User Manual
COVER
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
D770-25-00 1 I56-1427-001R
EPS10EXP Explosion Proof
Alarm Pressure Switch
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 alarm 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: Installation, Maintenance, and Use of
Protective Signaling Systems
NFPA 13: Installation of Sprinkler 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.
Operation
As pressure changes, a diaphragm actuates 2 snap action
switches. The pressure switch actuation is determined by
adjustment settings.
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
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.
Figure 1. Pressure switch basic dimensions:
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.
D770-25-00 2 I56-1427-001R
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.
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 3 and Table 1).
Adjustments To Factory Settings
CAUTION
WET
SYSTEM
ALARM
CHECK
VALVE
OS & Y
VALVE
WATER
BY-PASS
VALVE
LOCAL ALARM
SHUT OFF
VALVE
RETARD
WATER
MOTOR
GONG
EPS10EXP
WET
SYSTEM
ALARM
CHECK
VALVE
OS & Y
VALVE
WATER
BY-PASS
VALVE
LOCAL ALARM
SHUT OFF
VALVE
RETARD
WATER
MOTOR
GONG
EPS10EXP
DRY
SYSTEM
ALARM
CHECK
VALVE
OS & Y
VALVE
WATER
BY-PASS
VALVE
LOCAL ALARM
SHUT OFF
VALVE
WATER
MOTOR
GONG
CHECK
VALVE
EPS10EXP
WET SYSTEM WET SYSTEM DRY SYSTEM
WIRE TO ALARM
INDICATING CIRCUIT
OF FIRE ALARM
CONTROL PANEL
WIRE TO ALARM
INDICATING CIRCUIT
OF FIRE ALARM
CONTROL PANEL
WIRE TO ALARM
INDICATING CIRCUIT
OF FIRE ALARM
CONTROL PANEL
TO
SPRINKLER
SYSTEM
TO
SPRINKLER
SYSTEM
TO
SPRINKLER
SYSTEM
Figure 2. Typical piping diagram for EPS10EXP
A78-2398-00
Figure 3. Switch terminals:
Table 1. Electrical connections (referenced at factory settings):
COMMON
TERMINALS
TERMINAL
“A”
SWITCH #2
TERMINAL
“B”
GROUND
SCREW
(GREEN)
SWITCH #1
A78-2346-02
BREAK WIRE AS SHOWN FOR
SUPERVISION OF CONNECTION.
DO NOT ALLOW STRIPPED WIRE
LEADS TO EXTEND BEYOND
SWITCH HOUSING. DO NOT
LOOP WIRES.
SWITCHES AT 4-8 P.S.I. (HIGH TRIP PT.)
SWITCHES AT 0 P.S.I.
SW1 SW2
MODEL EPS10EXP
SW1 SW2
B
COM
A
B
COM
A
A
COM
B
A
COM
B
BOTH SWITCHES ACTIVATE SIMULTANEOUSLY
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