General Information The Model VSR is a vane type waterﬂ ow switch for use on wet sprinkler systems. It 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 waterﬂ 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 flow of 10 GPM (38 LPM) 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.
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 ﬁ 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.
nstallation: See Fig. 1 These devices may be mounted on horizontal or vertical pipe. On horizontal pipe they should be installed on the top side of the pipe where they will be accessible. The device should not be installed within 6" (15 cm) of a ﬁ tting which changes the direction of the waterﬂ ow or within 24" (60 cm) of a valve or drain.
The Model VSG is a ﬂ exible vane type of waterﬂ ow switch for use in wet pipe water mist systems where a low ﬂ ow for alarm is required. It is designed for installation in sections of 2 to 4 inch (50mm to 100mm) stainless steel or brass pipe with wall thickness in accordance with the above speciﬁ cations (see “Nominal OD and Wall Thickness”).
The unit may also be used as a sectional waterﬂ ow detector on large systems.
The unit contains an output relay and an adjustable electronic retard.
The relay is actuated when a ﬂ ow of 3 gallons per minute (11,4 LPM) 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.
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