System Sensor EPS40EXP Installation And Maintenance Instructions page 2

Figure 2. Typical piping diagram for EPS40EXP
WIRE TO SUPERVISORY
CIRCUIT OF FIRE ALARM
CONTROL PANEL
EPS40EXP
INSTALL
BLEEDER
CHECK
VALVE FOR
VALVE
TESTING
AIR LINE
SHUT-OFF
VALVE
DRY SYSTEM
WARNING
To prevent ignition of hazardous atmospheres, disconnect
circuits before removing cover. Keep cover closed while cir-
cuits are live. Conduit runs must have sealing fittings con-
nected 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 posi-
tion; 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
pressure connection. The use of teflon pipe sealant
tape is recommended. Be sure the fitting is tight
enough to prevent leaks.
Figure 4. Switch location:
SWITCH #1
(HIGH SWITCH)
D770-26-00
WIRE TO ALARM
INDICATING CIRCUIT
OF FIRE ALARM
EPS10EXP
CONTROL PANEL
TO
SPRINKLER
SYSTEM
DRY
PIPE
CHECK
VALVE
VALVE
WATER
MOTOR
GONG
WATER
LOCAL ALARM
BY-PASS
SHUT OFF
OS & Y
TEST
VALVE
VALVE
VALVE
A78-2397-00
COMMON
TERMINAL
SWITCH #2
(LOW SWITCH)
TERMINAL
"B"
GROUND
SCREW
BREAK WIRE AS SHOWN FOR
SUPERVISION OF CONNECTION.
DO NOT ALLOW STRIPPED WIRE
LEADS TO EXTEND BEYOND
SWITCH HOUSING. DO NOT
LOOP WIRES.
firealarmresources.com
Figure 3. Typical piping diagram for EPS120EXP
AIR
EPS120EXP
PRESSURE
SUPPLY
BLEEDER
TEST
VALVE
WET
SYSTEM
ALARM
CHECK
VALVE
OS & Y
OS & Y
VALVE
VALVE
b. Apply tightening torque to the brass hex portion of
the device.
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.
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 fittings. If necessary, remove conduit entry
plug with 3/8" square wrench.
4. Connect wiring to terminals (see Figure 4 and Table 1).
Table 1. Electrical connections (referenced at
factory settings):
MODELS EPS40EXP, EPS120EXP
SWITCHES AT LOW TRIP POINT
B
COM
A
SW1
SWITCHES AT NORMAL SYSTEM PRESSURE
B
COM
A
SW1
SWITCHES AT HIGH TRIP POINT
B
COM
A
SW1
A78-2346-02
2
WATER
MOTOR
GONG
RETARD
WATER LOCAL ALARM
BY-PASS SHUT OFF
VALVE VALVE
A78-2398-02
CAUTION
B
COM
A
SW2
B
COM
A
SW2
B
COM
A
SW2
I56-1428-001R