Potter VSR-2 User Manual

PRINTED IN USA PAGE 1 OF 4
VSR
VANE TYPE WATERFLOW
ALARM SWITCH WITH RETARD
MFG. #5401146 - REV M
11/15
UL, CUL and CSFM Listed, FM Approved, LPCB Approved, For
CE Marked (EN12259-5) / VdS Approved model use VSR-EU
Service Pressure: 450 PSI (31 BAR) - UL
Flow Sensitivity Range for Signal:
4-10 GPM (15-38 LPM) - UL
Maximum Surge: 18 FPS (5.5 m/s)
Contact Ratings: Two sets of SPDT (Form C)
10.0 Amps at 125/250VAC
2.0 Amps at 30VDC Resistive
10 mAmps min. at 24VDC
Conduit Entrances: Two knockouts provided for 1/2" conduit.
Individual switch compartments suitable
for dissimilar voltages.
Environmental Specications:
 • NEMA4/IP54RatedEnclosuresuitableforindooror
outdoor use with factory installed gasket and die-cast housing
whenusedwithappropriateconduittting.
 • TemperatureRange:40°F-120°F,(4.5°C-49°C)-UL
 • Non-corrosivesleevefactoryinstalledinsaddle.
Service Use:
AutomaticSprinkler   NFPA-13
Oneortwofamilydwelling   NFPA-13D 
Residentialoccupancyuptofourstories NFPA-13R
NationalFireAlarmCode   NFPA-72
• Installationmustbeperformedbyqualiedpersonnelandin 
accordance with all national and local codes and ordinances.
•Shockhazard.Disconnectpowersourcebeforeservicing.Serious 
injury or death could result.
•Riskofexplosion.Notforuseinhazardouslocations.Serious 
injury or death could result.
Ordering Information
NominalPipeSize Model PartNumber
2" DN50 VSR-2 1144402
2 1/2" DN65 VSR-2 1/2 1144425
3" DN80 VSR-3 1144403
3 1/2" - VSR-3 1/2 1144435
4" DN100 VSR-4 1144404
5" - VSR-5 1144405
6" DN150 VSR-6 1144406
8" DN200 VSR-8 1144408
Specicationssubjecttochangewithoutnotice.
Optional:CoverTamperSwitchKit,stockno.0090148
Replaceable Components:Retard/SwitchAssembly,stockno.1029030
Waterowswitchesthataremonitoringwetpipesprinklersystemsshall
notbeusedasthesoleinitiatingdevicetodischargeAFFF,deluge,
orchemicalsuppressionsystems.Waterowswitchesusedforthis
application may result in unintended discharges caused by surges,
trappedair,orshortretardtimes.
Potter Electric Signal Company, LLC• St. Louis, MO • Phone: 866-956-1211/Canada 888-882-1833 • www.pottersignal.com
General Information
TheModelVSRisavanetypewaterowswitchforuseonwetsprinkler
systems.ItisULListedforuseonasteelpipe;schedules5through40,
sizes2"-6"andisULListedandFMApprovedforuseonsteelpipe;
schedules10through40,sizes2"thru8"(50mmthru200mm).LPC
approvedsizes are 2" thru 8" (50 mm thru 200 mm). See Ordering
Information chart.
TheVSRmayalsobeusedasasectionalwaterowdetectoronlarge
systems.TheVSRcontainstwosinglepole,doublethrow,snapaction
switchesandanadjustable,instantlyrecyclingpneumaticretard.The
switchesareactuatedwhenaowof10GPM(38LPM)ormoreoccurs
downstreamofthedevice.Theowconditionmustexistforaperiod
of time necessary to overcome the selected retard period.
Enclosure
TheVSRswitchesandretarddeviceareenclosedinageneralpurpose,
die-cast housing. The cover is held in place with two tamper resistant
screws which require a special key for removal. A eldinstallable
cover tamper switch is available as an option which may be used
to indicate unauthorized removal of the cover.  See bulletin number
5401103 for installation instructions of this switch.
Important: This document contains important information on the installation and operation of theVSR waterow switches. Please read all
instructionscarefullybeforebeginninginstallation.AcopyofthisdocumentisrequiredbyNFPA72tobemaintainedonsite.

Potter VSR-2 Specifications

General

Port Type	NPT
Power over Ethernet	No
Operating Temperature	32°F to 120°F (0°C to 49°C)
Enclosure Rating	NEMA 4
Operating Pressure	Up to 175 PSI (12, 1 BAR)
Maximum System Pressure	250 PSI (17, 2 BAR)
Maximum Surge	18 FPS (5, 5 m/s)
Mounting	Pipe Mount

Summary

Product Overview and Safety

General Information

Description of the VSR waterflow switch, its applications, and operational requirements.

Enclosure Specifications

Details on the VSR's NEMA 4/IP54 rated die-cast housing suitable for indoor/outdoor use.

Critical Safety Warnings

Important warnings regarding shock hazard, explosion risk, and proper installation practices.

Installation and Compatibility

Installation Procedure

Guidance on mounting the device on horizontal or vertical pipes, avoiding fittings and valves.

Retard Adjustment

Instructions on adjusting the time delay for the pneumatic retard mechanism to prevent false alarms.

Compatible Pipe Requirements

Specifications for pipe compatibility, wall thickness, hole size, and torque values.

Electrical, Testing, and Dimensions

Typical Electrical Connections

Wiring diagrams and notes for connecting the VSR switches to signaling devices.

Testing and Inspection Frequency

Requirements for testing the waterflow switch operation and recommended inspection intervals.

Mounting Dimensions

Diagrams showing physical dimensions and mounting hole locations for the waterflow switch.

Maintenance and Replacement Procedures

Routine Maintenance

Recommendations for monthly inspection of the detector for leaks and proper function.

Retard/Switch Assembly Replacement

Step-by-step guide for field-replacing the internal retard and switch assembly without draining.

Waterflow Switch Removal

Instructions for safely removing the waterflow detector from the pipe, including draining the system.