Safe Signal EPS10 Series User manual

EPS10 Series Alarm Pressure Switches
INSTALLATION AND MAINTENANCE INSTRUCTIONS
IMPORTANT
Please Read Carefully and Save
This instruction manual contains important information about the installation and op-
eration 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
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. Safe Signal 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, 1/2HP @ 125/250 VAC
8 A, 125/250 VAC (LPCB only)
2.5A @ 6/12/24 VDC
Overall Dimensions: See Figure 1
Operating Temperature Range: –40° to +160°F
Maximum Service Pressure: 300 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 determined 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
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 connec-
tion. 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 device.
WARNING
High voltage. Electrocution hazard. Do not handle live AC wiring or work on a de-
vice 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 flex-
ible metallic conduit and appropriate conduit fittings must be used. Recom-
mended 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 3 and Table 1).
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
AB
GROUND
SCREW
(GREEN)
SWITCH #2
I56-0551-L
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.)
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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
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
point setting by approximately 2.5 PSI. A reset differential 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.
MODEL
FACTORY SETTINGS (PSI)
Fall
(Low Switch)
Approx.
Reset
Rise
(High Switch)
Approx.
Reset
EPS10-1 — — 4 – 8 3 PSI diff.
EPS10-2 — — 4 – 8 3 PSI diff.
NOTE: The sensor assembly is not field replaceable. Do not attempt to disassemble
these parts. If you have any questions, consult Safe Signal. Safe Signal rec-
ommends careful consideration of the following factors when specifying
and installing Alarm Pressure Switches. Always refer to the Installation and
Maintenance Instruction for specific recommendations on individual devices
before installing the unit.
• Electrical ratings stated in literature and on nameplates 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 installation. Perform preven-
tive 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
control 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.
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 (counterclockwise 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
THREE-YEAR LIMITED WARRANTY
SAFE SIGNAL warrants that the equipment herein shall conform to said descriptions as to all af-
firmation of fact and shall be free from defects of manufacture, labeling, and packaging for a pe-
riod of three (3) years from the invoice date to the original purchaser, provided that representative
samples are returned to SAFE SIGNAL for inspection. Upon a determination by SAFE SIGNAL
that a product is not as warranted, SAFE SIGNAL shall, at its exclusive option, replace or repair
said defective product or parts thereof at its own expense except that Purchaser shall pay all
shipping, insurance, and similar charges incurred in connection with the replacement of the
defective product or parts thereof. This Warranty is void in the case of abuse, misuse, abnormal
usage, faulty installation, or repair by unauthorized persons, or if for any other reason SAFE
SIGNAL determines that said product is not operating properly as a result of causes other than
defective manufacture, labeling, or packaging.
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