System Sensor EPS10 Series User manual

D770-08-00 1 I56-0551-007R
EPS10 Series Alarm
Pressure Switches
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: [phone]
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, follow-
ing 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
NFPA 13A: Inspection, Testing, and Maintenance 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.
CAUTION
Do not use in potentially explosive atmospheres.
Do not leave unused wires exposed.
Specifications
Contact Ratings: 10 A, 1/2 HP @ 125/250 VAC
2.5A @ 6/12/24 VDC
Overall Dimensions: See Figure 1
Operating Temperature Range: –40° to +160°F
Maximum Service Pressure: 250 PSI
Maximum Adjustment Range: 4 – 20 PSI
Enclosure Rating: UL 4x — Indoor or Outdoor Use
NEMA 4 — Indoor or Outdoor Use
IP54
Approximate Differential: 3 PSI throughout range
Operation
As pressure changes, a diaphragm actuates 1 or 2 snap
action switches. The pressure switch actuation is deter-
mined by adjustment settings.
Installation
1. Remove Cover
Cover is held on by two tamper resistant screws.
(Removal key is enclosed with pressure switch.)
2. Mounting the Switch
The device is designed to be mounted in the upright or
horizontal position; side mounting is also acceptable.
Locate it where vibration, shock, and mechanical load-
ing are minimal. Refer to piping diagram (Figure 2 on
page 2).
Figure 1. Pressure switch basic dimensions:
W0170-00
HEX
ADJUSTMENT
SCREW
MAIN ADJUSTMENT
WHEEL
4-1/4"
5-1/8"
LOCKING SCREW
1/2" NPT
COM
A B
GROUND
SCREW
(GREEN)
SWITCH #2
I56-0551-007R

D770-08-00 2 I56-0551-007R
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 por-
tion of 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 utiliz-
ing 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 appro-
priate conduit fittings must be used. Recommended con-
nectors are Thomas and Betts PN 5332 (180° coupling),
PN 5352 (90° coupling), and PN 5262 seal ring.
4. Connect wiring to terminals (see Figure 3 and Table 1).
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
EPS10
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 EPS10-1, EPS10-2
W0171-01
Figure 3. Switch terminals:
W0173-00
Table 1. Electrical connections (referenced at factory
settings):
MODEL EPS10-1 MODEL EPS10-2
A
COM
B
SWITCHES AT 0 P.S.I.
SWITCH AT 0 P.S.I.
SWITCH AT 4-8 P.S.I. (HIGH TRIP PT.)
B
COM
A
B
COM
A
B
COM
A
A
COM
B
A
COM
B
SWITCH 1 BOTH SWITCHES ACTIVATE SIMULTANEOUSLY
SW1 SW2
SW1 SW2
SWITCHES AT 4-8 P.S.I. (HIGH TRIP PT.)
GROUND
SCREW
COM
B
A
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
SWITCH #2
LOCKING
SCREW
TERMINAL “A”
TERMINAL “B”
EPS10 EPS10

Adjustments To Factory Settings
Both EPS10-1 and EPS10-2 devices are pre-adjusted at the
factory to alarm at 4–8 PSI on rising pressure (see Table
2). Pressure switch settings may be adjusted in the field to
obtain a different pressure alarm response from 4 PSI to 20
PSI. The switch has an override feature on the adjustment
mechanism to prevent exceeding the 20 PSI max. setting of
the switch. This override feature carries with it a tolerance
band that may limit the upper adjustment to 16–20 PSI.
Care must be used when setting the switch to ensure that
the lower limit of 4 PSI is not exceeded. This will allow the
switch to reset within the 3 PSI differential stated.
1. Install pressure switch as stated in “INSTALLATION”
portion of instruction manual. Attach pressure test
source to system.
2. Back off locking screw (see Figure 1) to allow main
adjustment wheel to rotate freely.
3. Test trip point by slowly introducing pressure from the
pressure test source. When trip point is found, reduce
pressure to zero. Rotate main adjustment wheel (coun-
terclockwise to increase pressure) and retest until switch
trip point is at the desired pressure setting (4–20 PSI
range). Each number represents an approximate trip
point change of 0.2 PSI. One full rotation changes the
trip point setting by approximately 2.5 PSI. A reset dif-
ferential of approximately 3 PSI is typical throughout the
entire adjustment range of switch.
4. Retest the set point several times to ensure accuracy of
setting.
5. Re-seat locking screw.
Table 2.
Factory Settings (PSI)
MODEL Fall
(Low Switch)
Approx.
Reset
Rise
(High Switch)
EPS10-1
EPS10-2
–– ––
–––– 3 PSI diff.
3 PSI diff.
4– 8
4– 8
Approx.
Reset
D770-08-00 3 I56-0551-007R
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 follow-
ing factors when specifying and installing Alarm
Pressure Switches. Always refer to the Installation
and Maintenance Instruction for specific recom-
mendations on individual devices before installing
the unit.
• Electrical ratings stated in literature and on name-
plates should not be exceeded.
• 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 instal-
lation. Perform preventive maintenance and periodic
testing as required by the applicable NFPA standards
but not less than bimonthly.
• 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 con-
trol is especially recommended for applications where
a runaway condition could result.
• Do not mount unit where ambient temperatures will
exceed published limits.
• Avoid impact or mechanical loading.

D770-08-00 4 I56-0551-007R
© System Sensor 2004
System Sensor warrants its enclosed pressure switch to be free from
defects in materials and workmanship under normal use and service for a
period of three years from date of manufacture. System Sensor makes no
other express warranty for this pressure switch. No agent, representative,
dealer, or employee of the Company has the authority to increase or alter
the obligations or limitations of this Warranty. The Company’s obliga-
tion of this Warranty shall be limited to the repair or replacement of any
part of the pressure switch which is found to be defective in materials or
workmanship under normal use and service during the three year period
commencing with the date of manufacture. After phoning System Sensor’s
toll free number 800-SENSOR2 (736-7672) for a Return Authorization
number, send defective units postage prepaid to: System Sensor, Return
Please refer to insert for the Limitations of Fire Alarm Systems
Three-Year Limited Warranty
Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174.
Please include a note describing the malfunction and suspected cause
of failure. The Company shall not be obligated to repair or replace units
which are found to be defective because of damage, unreasonable use,
modifications, or alterations occurring after the date of manufacture. In
no case shall the Company be liable for any consequential or incidental
damages for breach of this or any other Warranty, expressed or implied
whatsoever, even if the loss or damage is caused by the Company’s neg-
ligence or fault. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation or exclusion
may not apply to you. This Warranty gives you specific legal rights, and
you may also have other rights which vary from state to state.