POTTER VSR – EU Vane Type Waterflow Alarm Switch Owner’s Manual

: June 9, 2024
: POTTER

Table of Contents

Specifications
Environmental Specifications
Service Use
General Information
Enclosure
Installation
Retard Adjustment
Typical Electrical Connections
Testing
Mounting Dimensions
Maintenance
Removal of Waterflow Switch
Retard/Switch Assembly Replacement
Customer Support
References
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POTTER VSR – EU Vane Type Waterflow Alarm Switch

Specifications

Specifications subject to change without notice.

Ordering Information

Nominal Pipe Size| Model| Part Number
DN50| 2″| VSR-EU 2| 1116061
DN65| 2 1/2″| VSR-EU 2 1/2| 1116062
DN80| 3″| VSR-EU 3| 1116063
DN100| 4″| VSR-EU 4| 1116064
DN125| 5″| VSR-EU 5| 1116067
DN150| 6″| VSR-EU 6| 1116065
DN200| 8″| VSR-EU 8| 1116066

Replaceable Components: Retard/Switch Assembly, stock no. 1029020

UL, CUL and CSFM Listed, FM Approved, LPCB Approved,

CE Marked (EN12259-5), VdS Approved

Service Pressure: 31 BAR (450 PSI) – UL
Flow Sensitivity Range for Signal:
15-38 LPM (4-10 GPM) – UL
30-57 LPM (8-15 GPM) – VdS
No Signal below 1- LPM (2.6 GPM) – VdS
Pressure Loss:
0.2 BAR (3 PSI) max. at 5 m/s (DN50-100)
0.007 BAR (1 PSI) max. at 5 m/s (DN150-200)
Maximum Surge: 5.5 m/s (18 FPS)
Contact Ratings:
Two sets of SPDT (Form C)
10.0 Amps at 125/250 VAC
2.0 Amps at 30VDC Resistive
10 mAmps min. at 24 VDC
Conduit Entrances: Two knockouts provided for 1/2″ conduit.

Environmental Specifications

NEMA 4/IP54 Rated Enclosure suitable for indoor or
outdoor use with factory installed gasket and die-cast housing
when used with appropriate conduit fitting.
Temperature Range:
4.5°C – 49°C (40°F – 120°F) – UL
1°C – 68°C (34°F – 154°F) – VdS
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

WARNING

Installation must be performed by qualified 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.

CAUTION Waterflow 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. Waterflow switches used for this application may result in unintended discharges caused by surges, trapped air, or short retard times.

General Information

The Model VSR-EU is a vane type waterflow switch for use on wet sprinkler systems. It is UL Listed and FM Approved for use on steel pipe; schedules 10 through 40, sizes 50 mm thru 200 mm (2″ thru 8″). LPC approved sizes are 50 mm thru 200 mm (2″ thru 8″). See Ordering Information chart.
The VSR-EU may also be used as a sectional waterflow detector on large systems. The VSR-EU contains two single pole, double throw, snap action switches and an adjustable, instantly recycling pneumatic retard. The switches are actuated when a flow of 38 LPM (10 GPM) or more occurs downstream of the device. The flow condition must exist for a period of time necessary to overcome the selected retard period.

Enclosure

The VSR-EU 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.

Installation

These devices may be mounted on horizontal or vertical pipe. On horizontal pipe they shall be installed on the top side of the pipe where they will be accessible. The device should not be installed within 15 cm (6″) of a fitting which changes the direction of the waterflow or within 60 cm (24″) of a valve or drain.

NOTE: Do not leave cover off for an extended period of time

Drain the system and drill a hole in the pipe using a hole saw in a slow speed drill (see Fig. 1). Clean the inside pipe of all growth or other material for a distance equal to the pipe diameter on either side of the hole. Roll the vane so that it may be inserted into the hole; do not bend or crease it. Insert the vane so that the arrow on the saddle points in the direction of the waterflow. Take care not to damage the non-corrosive bushing in the saddle. The bushing should fit inside the hole in the pipe. Install the saddle strap and tighten nuts alternately to required torque (see the chart in Fig. 1). The vane must not rub the inside of the pipe or bind in any way.

CAUTION

Do not trim the paddle. Failure to follow these instructions may prevent the device from operating and will void the warranty.
Do not obstruct or otherwise prevent the trip stem of the flow switch from moving when water flows as this could damage the flow switch and prevent an alarm. If an alarm is not desired, a qualified technician should disable the alarm system.

Retard Adjustment

The delay can be adjusted by rotating the retard adjustment knob from 0 to the max setting (20-30 seconds). The time delay should be set at the minimum required to prevent false alarms

CAUTION

Hole must be drilled perpendicular to the pipe and vertically centered. Refer to the Compatible Pipe/Installation Requirements chart for size.
Correct| Incorrect
|

Compatible Pipe/ Installation Requirements

Model

|

Nominal Pipe Size

|

Nominal Pipe O.D.

|

Pipe Wall Thickness

|

Hole Size

|

U-Bolt Nuts Torque

Schedule 10 (UL)| Schedule 40 (UL)| BS-1387 (LPC)| DN (VDS)
| mm| inch| mm| inch| mm| inch| mm| inch| mm| inch| mm| inch| mm| inch| n-m| ft=lb
VSR-EU 2| DN50| 2| 60.3| 2.375| 2.77| 0.109| 3.91| 0.154| 3.6| 0.142| 2.3| 0.091| 33.0 ± 2.0| 1.25 + .125/-.062| 27| 20
VSR-EU 2 1/2| –| 2.5| 73.0| 2.875| 3.05| 0.120| 5.16| 0.203| –| –| –| –
VSR-EU 2 1/2| DN65| –| 76.1| 3.000| –| –| –| –| 3.6| 0.142| 2.6| 0.102
VSR-EU 3| DN80| 3| 88.9| 3.500| 3.05| 0.120| 5.49| 0.216| 4.0| 0.157| 2.9| 0.157| 50.8 ± 2.0| 2.00 ± .125
VSR-EU 4| DN100| 4| 114.3| 4.500| 3.05| 0.120| 6.02| 0.237| 4.5| 0.177| 3.2| 0.177
VSR-EU 5| –| 5| 141.3| 5.563| 3.40| .0134| 6.55| 0.258| –| –| –| –
VSR-EU 5| DN125| –| 139.7| 5.500| –| –| –| –| 5.0| 0.197| 3.6| 0.142
VSR-EU 6| DN150| 6| 168.3| 6.625| 3.40| 0.134| 7.11| 0.280| 5.0| 0.197| 4.0| 0.157
VSR-EU 8| DN200| 8| 219.1| 8.625| 3.76| 0.134| 8.18| 0.322| 6.3| .248| 4.5| 0.177

NOTE: For copper or plastic pipe use Model VSR-CF.

To remove knockouts: Place screwdriver at inside edge of knockouts, not in the center.

NOTICE Do not drill into the base as this creates metal shavings which can create electrical hazards and damage the device. Drilling voids the warranty.

Switch Terminal Connections Clamping Plate Terminal

WARNING 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 become dislodged from under the terminal. Failure to sever the wire may render the device inoperable risking severe property damage and loss of life.
Do not strip wire beyond 3/8″ of length or expose an uninsulated conductor beyond the edge of the terminal block. When using stranded wire, capture all strands under the clamping plate.

Typical Electrical Connections

Notes:

The Model VSR-EU has two switches, one can be used to operate a central station, proprietary or remote signaling unit, while the other contact is used to operate a local audible or visual annunciator.
A condition of LPC Approval of this product is that the electrical entry must be sealed to exclude moisture.
For supervised circuits, see “Switch Terminal Connections” drawing and warning note (Fig. 3).

Testing

The frequency of inspection and testing for the Model VSR-EU and its associated protective monitoring system shall be in accordance with applicable NFPA Codes and Standards and/or the authority having jurisdiction (manufacturer recommends quarterly or more frequently).
If provided, the inspector’s test valve shall always be used for test purposes. If there are no provisions for testing the operation of the flow detection device on the system, application of the VSR-EU is not recommended or advisable.
A minimum flow of 38 LPM (10 GPM) is required to activate this device.

NOTICE Advise the person responsible for testing of the fire protection system that this system must be tested in accordance with the testing instructions

Mounting Dimensions

Maintenance

Inspect detectors monthly. If leaks are found, replace the detector. The VSR- EU waterflow switch should provide years of trouble-free service.
The retard and switch assembly are easily field replaceable. In the unlikely event that either component does not perform properly, please order replacement retard switch assembly stock #1029020 (see Fig. 7). There is no maintenance required, only periodic testing and inspection.

Removal of Waterflow Switch

To prevent accidental water damage, all control valves should be shut tight and the system completely drained before waterflow detectors are removed or replaced.
Turn off electrical power to the detector, then disconnect wiring.
Loosen nuts and remove U-bolts.
Gently lift the saddle far enough to get your fingers under it. With your fingers, roll the vane so it will fit through the hole while continuing to lift the waterflow detector saddle.
Lift detector clear of pipe.

Retard/Switch Assembly Replacement

The Retard/Switch Assembly is field-replaceable without draining the system removing or removing the waterflow switch from the pipe

Make sure the fire alarm zone or circuit connected to the waterflow switch is bypassed or otherwise taken out of service.
Disconnect the power source for local bell (if applicable).
Identify and remove all wires from the waterflow switch.
Remove the (2) mounting screws holding retard/switch assembly to the base. Do not remove the (2) retard housing screws.
Remove the retard assembly by lifting it straight up over the tripstem.
Install the new retard assembly. Make sure the locating pins on the retard/switch assembly fit into the locating pin bosses on the base.
Re-install the (2) original mounting screws.
Reconnect all wires. Perform a flow test and place the system back in service.