Safe Signal EPS40EXP User manual

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
EPS40EXP and EPS120EXP Explosion Proof
Supervisory Pressure Switches
INSTALLATION AND MAINTENANCE INSTRUCTIONS
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 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.
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 switch-
es. The pressure switch actuation is determined by adjustment
settings.
Figure 1. Pressure switch basic dimensions:
W0174-00
I56-1428-C
1 I56-1428-C
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BREAK WIRE AS SHOWN FOR
SUPERVISION OF CONNECTIO N.
DO NOT ALLOW STRIPPED WIRE
LEADS TO EXTEND BEYOND
SWITCH HOUSING. DO NOT
LOOP WIRES.
W0177-00
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.
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 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 the
device.
W0180-00
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 CIRCUI
OF FIRE ALARM
CONTROL PANEL
TO
SPRINKLER
SYSTEM
Table 1. Electrical connections (referenced at
factory settings):
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 4 and Table 1).
Adjustments To Factory Settings
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
W0181-00
Figure 4. Switch location:
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
SWITCH # 1
COMMON
TERMINALS
TERMINAL
"A"
TERMINAL
"B"
SWITCH #2
GROUND
SCREW
(GREEN)
W0175-00
(HIGH SWITCH)
W0179s-00
2 I56-1428-C
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Table 2.
FACTORY SETTINGS ( PSI)
MODEL Fall Sw2
(Low Switch) Nominal Rise Sw1
(Hi Switch)
EPS40EXP 30 ± 1.5 40 50 ± 2.5
EPS120EXP 101.5 - 112.5 115 117.5 - 128.5
Dual-switch Model — EPS40EXP and EPS120EXP
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. Option 1: To adjust the nominal setting of the pressure win-
dow (low switch setting to high switch setting) without affect-
ing the size of the window, adjust the main adjustment wheel,
Figure 1, to the desired setting using the pressure source to
verify each switch setting. Each tine on the wheel represents
an approximate window shift of 1.8 PSI for the EPS40EXP
and 6.6 PSI for the EPS 120EXP. For each 1/2 rotation of the
adjustment wheel, the window changes by approximately 11
PSI for the EPS 40EXP and 40 PSI for the EPS 120EXP.
Option 2: To adjust the pressure window size and the nominal
setting of the pressure window, adjust the main adjustment
wheel, Figure 1, until the high switch (SW1) trips at the
desired pressure using the pressure test source. Decrease the
pressure until the low switch (SW2) trips. Note pressure and
determine how much change is desired on the low switch.
Adjust the 1/4 ″ hex screw, Figure 1, to either increase (coun-
terclockwise) or decrease (clockwise) the window size. (The
low switch will be affected.) The approximate sensitivity of
the hex screw adjustment: 1/2 turn = 5 PSI. An approximate
maximum window size of 30 PSI is obtainable. Retest the high
switch after adjusting the low switch.
4. Retest the set points several times to ensure the accuracy of
the settings.
5. Re-seat locking screw.
6. Re-install adjustment wheel cover.
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 recom-
mends careful consideration of the following factors
when specifying and installing Alarm and Supervisory
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.
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.
3 I56-1428-C
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