POTTER VSR-SFT Waterflow Alarm Switch with Union Owner’s Manual
- June 9, 2024
- POTTER
Table of Contents
POTTER VSR-SFT Waterflow Alarm Switch with Union
US Patent No. 6,471,255
Stock No. 1113777
1113605 W/TSK
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-721
CUL, UL and CSFM Listed, CE Marked, NYMEA ACCEPTED
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Service Pressure: Up to 175 PSI (12,07 BAR)
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Minimum Flow Rate for Alarm: 8-10 GPM (30-38 LPM)
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Maximum Surge: 18 FPS (5,5 m/s)
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Enclosure: Die-cast, red powdercoat fi nish
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No. 1113777: Cover held in place with tamper resistant screws
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No. 1113605 – Tamper: Cover incorporates micro-switch.
- Cover Tamper: Activated by cover removal.
- Cover Tamper Switch Contacts: One set SPDT, Rated at 250VAC.
- Cover Tamper Switch Terminations: 8″ 22AWG wire leads.
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Contact Ratings: Two sets of SPDT (Form C) 15.0 Amps at 125/250 VAC 2.0 Amps at 30 VDC
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Conduit Entrances: Two knockouts provided for 1/2″ conduit.
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Usage: Listed plastic, copper and schedule 40 iron pipe.
Fits pipe sizes – 1″, 1-1/4″, 1-1/2″ and 2″
Note: 12 paddles are furnished with each unit, one for each
pipe size of threaded and sweat TEE, one for 1″ CPVC, one
for 1″ CPVC (Central), one for 1-1/2″ polybutylene and one
for 1-1/2″ threaded (Japan). -
Environmental Specifi cations:
- Suitable for indoor or outdoor use with factory installed gasket and die-cast housing.
- For NEMA 4/IP55 rated enclosure – use with appropriate conduit fi tting and/or plugs.
- Temperature range: 40° F to 120° F (4,5° C to 49° C)
Caution: This device is not intended for applications in explosive environments
The Model VSR-SFT is a vane type waterfl ow switch for use on wet sprinkler systems that use 1″, 1-1/4″, 1-1/2″ or 2″ pipe sizes. It is equipped with a union to accommodate installation in confi ned spaces. The unit contains two single pole double throw snap action switches and an adjustable, instantly recycling pneumatic retard. The switches are actuated when a fl ow of 8-10 gallons per minute (30-38 liters per minute) or more occurs downstream of the device. The fl ow condition must exist for a period of time necessary to overcome the selected retard period.
INSTALLATION
These devices may be mounted in horizontal or vertical pipe. On horizontal
pipe they should be installed on the top side of the pipe where they will be
accessible. The units should not be installed within 6″ (15 cm) of a valve,
drain or fi tting which changes the direction of the waterfl ow. The unit has a
1″ NPT fi tting for threading into a non-corrosive TEE. See Fig. 1 for proper
TEE size, type and installation. Select the proper paddle for the pipe size
and type of TEE used. See Fig. 3 for instructions on how to change the paddle.
Loosen the union nut and separate the 1″ NPT fi tting from the VSR-SFT. Use no
more than three wraps of tefl on tape as thread lubricant. Reattach the VSR-SFT
to the 1″ NPT fi tting, verifying that the o-ring is properly positioned in its
groove. Hand tighten the nut on the union after orienting the device in the
appropriate direction to detect waterfl ow as shown in Fig. 2.
CAUTION: Do not over-tighten the union nut, hand tighten only!
The vane must not rub the inside of the TEE or bind in any way. The stem
should move freely when operated by hand.
The device can also be used in copper or plastic pipe installations with the
proper adapters so that the specifi ed TEE fi tting may be installed on the pipe
run.
INSPECTION AND TESTING: Check the operation of the unit by opening the
inspector’s test valve at the end of the sprinkler line or the drain and test
connection, if an inspector’s test valve is not provided.
If there are no provisions for testing the operation of the fl ow detection
device on the system, application of the VSR-SFT is not recommended or
advisable.
The frequency of the inspection and testing and its associated protective
monitoring system should be in accordance with the applicable NFPA Codes and
Standards and/or authority having jurisdiction (manufacturer recommends
quarterly or more frequently).
Screw the fi tting into the TEE fi tting as shown.
On sweat TEE’s, no threaded bushings, inserts or adapters are permitted unless
they comply with the dimensions listed in the chart below.
Caution: To prevent leakage apply tefl on tape sealant to the 1″ NPT male fi
tting only. Do not use any other type of lubricant or sealant.
Important – the depth to the inside bottom of the TEE should have the
following dimensions:
APPROXIMATE DEPTH REQUIREMENT
TEE SIZE| THREADED| SWEAT| POLYBUTYLENE| CPVC
1″ x 1″ x 1″| 2-1/16″| 1-3/4″| N/A| 2-7/16″
1-1/4″ x 1-1/4″ x 1″| 2-7/16″| 2-7/16″| N/A| N/A
1-1/2″ x 1-1/2″ x 1″| 2-11/16″| 2-1/4″| 2-1/2″| N/A
2″ x 2″ x1″| 3-3/16″| 2-3/4″| N/A| N/A
FIG. 2
Retard Adjustment:
To change time, turn knob (either direction) for desired time delay. Use the
minimum amount of retard necessary to prevent false alarms. A “B” setting is
usually adequate for this. Factory set at “B”.
Important:
There are 12 paddles furnished with each unit. One for each size of threaded,
sweat or plastic TEE as described in Fig. 1. The paddles have raised lettering
that show the pipe size and type of TEE that they are to be used with. The
proper paddle must be used. The paddle must be properly attached (see Fig. 3)
and the screw that holds the paddle must be securely tightened.
FIG. 4 SWITCH TERMINAL CONNECTIONS CLAMPING PLATE TERMINAL
CAUTION:
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.
COVER TAMPER SWITCH
(SHOWN WITH COVER IN PLACE)
FIG. 5 TYPICAL ELECTRICAL CONNECTIONS
NOTES:
- The model VSR-SFT has two switches, one can be used to operate a central station, proprietary or remote signaling unit, while the other is used to operate a local audible or visual annunciator.
- For supervised circuits see “Switch Terminal Connections” drawing and caution note (Fig. 4).
APPLICATION WARNING!
Due to the possibility of unintended discharges caused by pressure surges, trapped air, or short retard times, waterfl ow switches that are monitoring wet pipe sprinkler systems should not be used as the sole initiating device to discharge AFFF, deluge, or chemical suppression systems.
References
- Fire Alarm Resources | Download fire alarm documents
- Potter Electric: Fire Alarms & Fire Sprinkler Systems
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