HEX
ADJUSTMENT
SCREW
MAIN ADJUSTMENT
WHEEL
4-1/4"
5-1/8"
LOCKING SCREW
1/2" NPT
COM
AB
GROUND
SCREW
(GREEN)
SWITCH #2
D770-17-00
1 I56-0986-008R
EPS40 Series and EPS120 Series
Supervisory Pressure Switches
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 installa-
tion 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 instruc-
tions 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 Protec-
tion Systems
NFPA 13D: Standard for 1 and 2 Family Dwellings and Manufactured Homes
NFPA 13R: Standard for Multi-family Dwellings
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.
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 screws.
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 (Fig. 2 and 3).
a. Mount the device directly to the line via the
1
⁄
2
" NPT pressure con-
nection. 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 the device.
SPECIFICATIONS
Contact Ratings:
10 A, 1/2 HP @ 125/250 VAC
8A @ 125/250 VAC ~ (LPCB ONLY)
2.5A @ 6/12/24 VDC
Overall Dimensions:
See Figure 1
Operating Temperature Range:
–40°F to +160°F
Maximum Service Pressure:
EPS40-1, EPS40-2:
300 PSI
EPS120-1, EPS120-2: 300 PSI
Adjustment Range:
EPS40-1, EPS40-2:
10-100 PSI
EPS120-1, EPS120-2: 10-200 PSI
Enclosure Rating:
UL 4x — Indoor or Outdoor Use
NEMA 4 — Indoor or Outdoor Use
IP54
Approximate Differential:
EPS40-1, EPS40-2:
3 PSI at 10 PSI
6 PSI at 100 PSI
EPS120-1, EPS120-2:
3 PSI at 10 PSI
9 PSI at 200 PSI
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 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. Rec-
ommended 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 4 and Table 1).
Adjustments to Factory Settings
FIGURE 1. PRESSURE SWITCH BASIC DIMENSIONS:
W0170-00
I56-0986-008R
APPENDIX B
