Safe Signal EPS10EXP User manual

EPS10EXP Explosion Proof
Alarm Pressure Switch
INSTALLATION AND MAINTENANCE INSTRUCTIONS
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 require-
ments 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 respon-
sible for devices that have been improperly installed, tested, or
maintained.
Operation
As pressure changes, a diaphragm actuates 2 snap action switch-
es. 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 hori-
zontal position; side mounting is also acceptable.
Figure 1. Pressure switch basic dimensions:
WARNING
To prevent ignition of hazardous atmospheres, disconnect cir-
cuits before removing cover. Keep cover closed while circuits are
live. Conduit runs must have sealing fittings connected within
18” of the enclosure.
W0174-00
I56-1427-C
COVER
4.9"
9.5"
LOCKING
SCREW
HEX ADJUST
SCREW
1/4" HEX HEAD
COVER
TAM PER
SET SCREW
(WRENCH
PROVIDED)
ADJUSTMENT
WHEEL
COVER
(WRENCH
PROVIDED)
MAIN ADJUSTMENT
WHEEL (TURN
COUNTERCLOSKWISE
TO INCREASE
PRESSURE)
1/2" NPT
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Locate it where vibration, shock, and mechanical loading
are minimal. Refer to piping diagram (Fig. 2 on page 2).
a. Mount the device directly to the line via the 1/2″NPT pres-
sure connection. The use of teflon pipe sealant tape is rec-
ommended. Be sure the fitting is tight enough to prevent
leaks.
b. Apply tightening torque to the brass hex portion of device.
CAUTION
High voltage. Electrocution hazard. Do not handle live AC wir-
ing 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 fit-
tings. If necessary, remove conduit entry plug with 3/8″
square wrench.
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
EPSA10
WET
SYSTEM
ALARM
CHECK
VALVE
OS & Y
VALVE
WATER
BY-PASS
VALVE
LOCAL ALARM
SHUT OFF
VALVE
RETARD
WATER
MOTOR
GONG
EPSA10
DRY
SYSTEM
ALARM
CHECK
VALVE
OS & Y
VALVE
WATER
BY-PASS
VALVE
LOCAL ALARM
SHUT OFF
VALVE
WATER
MOTOR
GONG
CHECK
VALVE
EPSA10
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 CIRCUI
OF FIRE ALARM
CONTROL PANEL
TO
SPRINKLER
SYSTEM
TO
SPRINKLER
SYSTEM
TO
SPRINKLER
SYSTEM
Figure 2. Typical piping diagram for EPS10EXP
W0146-00
Figure 3. Switch terminals:
Table 1. Electrical connections (referenced at factory
settings):
W0177-00
BREAK WIRE AS SHOWN FOR
SUPERVISION OF CONNECTIO N.
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
SWITCH # 1
COMMON
TERMINALS
TERMINAL
"A"
TERMINAL
"B"
SWITCH #2
GROUND
SCREW
(GREEN)
W0175-00
2 I56-1427-C
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Adjustments To Factory Settings
The EPS10EXP device is 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. Remove adjustment wheel cover and 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 pres-
sure 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 tine on the
wheel represents an approximate trip point change of 0.2 PSI.
One full rotation changes the trip point setting by approxi-
mately 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.
6. Re-install adjustment wheel cover.
Table 2.
NOTE: The sensor assembly is not field replaceable. Do not
attempt to disassemble these parts. If you have any ques-
tions, consult Safe Signal. Safe Signal recommends care-
ful consideration of the following factors when specify-
ing 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 electri-
cal codes.
• Install units away from shock and vibration. Proper electri-
cal fittings should be used to prevent moisture from enter-
ing the enclosure via the conduit.
• Test all devices for proper operation after initial installa-
tion. Perform preventive maintenance and periodic testing
as required by the applicable NFPA standards but not less
than bi-monthly.
• 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.
FACTORY SETTINGS (PSI)
MODEL Approx. Reset
EPS10EXP 4–8 3 PSI Di.
Rise
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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