D770-17-00
3 I56-0986-008R
NOTE: The sensor assembly is not field replaceable. Do not attempt to disas-
semble these parts. If you have any questions, consult System Sensor. System
Sensor recommends careful consideration of the following factors when speci-
fying 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 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 pre-
ventive 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.
Low Pressure
Adjusting
Screw
1/4" Hex Head
(Not Present in
Single Switch
Models)
Each 1/2 turn of Low Pressure adjsuting screw adjusts
pressure approximately 5 psi. Turn counter clockwise to increase
pressure. Turn clockwise to decrease pressure. Each 1/2 turn
of High Pressure adjusting wheel adjusts pressure 11 psi on the
EPS40-2 and 40 psi on the EPS120-2.
NOTE:
Main Adjusting Wheel
(Turn Counterclockwise
to Increase Pressure)
Switch 2
(Low Switch
EPS40-2 and
EPS120-2)
Switch 1
(High Switch
EPS40-2 and
EPS120-2; Low
Switch EPS40-1)
FIGURE 5. ADJUSTMENTS (DUAL-SWITCH MODEL SHOWN):
W0144-02
