Wiring Instructions; Dimensions - Potter PS120 Serie Notice

Wiring Instructions

1. Remove the tamper resistant screw with the special key
provided.
2. Carefully place a screwdriver on the edge of the knockout and
sharply apply a force sufficient to dislodge the knockout plug.
See Fig 9.
3. Run wires through an approved conduit connector and affix the
connector to the device.
A NEMA-4 rated conduit fitting is required
for outdoor use.
4. Connect the wires to the appropriate terminal connections for
the service intended. See Figures 2,4,5, and 6. See Fig 7 for two
switch, one conduit wiring.
Adjustments and Testing
NOTE: Testing the PS120 may activate other system connected devices.
The use of a Potter BVL (see product bulletin 8900067 for details) is
recommended to facilitate setting and testing of the PS120 pressure switch.
When a BVL (bleeder valve) is used, the pressure to the switch can be
isolated and bled from the exhaust port on the BVL without effecting the
supervisory pressure of the entire system. See Fig. 3
The operation of the pressure alarm switch should be tested upon completion
of installation and periodically thereafter in accordance with the applicable
NFPA codes and standards and/or the authority having jurisdiction
(manufacturer recommends quarterly or more frequently).
The operation point of the PS120 Pressure Switch can be adjusted to
any point between 35 and 225 psi (2,41 and 15,51 bar) by turning the
adjustment knob(s) clockwise to raise the actuation point and counter
clockwise to lower the actuation point. In the case of the PS120-2,
both switches operate independent of each other. Each switch may be
independently adjusted to actuate at any point across the switch adjustment
range. Initial adjustment can be made with a visual reference from the top
of the adjustment knob across to the printed scale on the switch bracket.
Final adjustments should be verified with a pressure gauge.

Dimensions

Fig 1
[72.97]
ADJUSTMENT
KNOB
1/2" NPT
2.48
[62.87]
3.78
[95.89]
NOTE: To prevent leakage, apply Teflon tape sealant to male threads only.
Potter Electric Signal Company, LLC
GROUND
SCREWS
2.87
4.22
[107.19]
1.60
[40.64]
3.20
[81.28]
DWG# 930-1
• St. Louis, MO
5400934 - REV K
firealarmresources.com
PS120 Series
Supervisory Pressure Switch
Switch Clamping Plate Terminal
Fig 2
An uninsulated section of a single conductor should not be looped around the
terminal and serve as two separate connections. The wire must be severed,
thereby providing supervision of the connection in the event that the wire
becomes dislodged from under the terminal.
Typical Sprinkler Applications
Fig 3
PS120
SUPERVISORY
PRESSURE
SWITCH
BLEEDER
WET SYSTEM
TEST
ALARM CHECK
VALVE
RBVS
VALVE
BVL
CHECK
VALVE
EXCESS
PRESSURE
PUMP
OS & Y
VALVE
RBVS
CAUTION
Closing of any shutoff valves between the alarm check valve and the PS10
will render the PS10 inoperative. To comply with NFPA-72 any such valve
shall be electrically supervised with a supervisory switch such as Potter
Model RBVS.
• Phone: 800-325-3936
•
9/21
PS10
WATERFLOW
WATER
ALARM
MOTOR
SWITCH
GONG
RBVS
WATER
BY-PASS
TEST VALVE
DWG #926-1A
• www.pottersignal.com
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