1144465 Potter VSR-ST Waterflow Alarm Switch with Union

Features

• 0-90 second field replaceable time delay retard
• Easy to read retard time delay adjustment knob
• Two SPDT (form C) contacts
• Weatherproof
• Easy to read wire terminal designations
• 5 year warranty

Description

The Model VSR-ST is a vane type waterflow 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 confined 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 flow of 10 gallons per minute (38 liters per minute) or more occurs downstream of the device. The flow 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 fitting which changes the direction of the waterflow. The unit has a 1" NPT fitting 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 fitting from the VSR-ST. Use no more than three wraps of teflon tape as thread lubricant. Reattach the VSR-ST to the 1" NPT fitting, 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 waterflow as shown in Fig. 2.

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 specified TEE fitting may be installed on the pipe run.

Technical Specifications

• Conduit Entrances - Two knockouts provided for 1/2" conduit Individual switch compartments suitable for dissimilar voltages
• Contact Ratings - Two sets of SPDT (Form C) 10.0 Amps at 125/250VAC 2.0 Amps at 30VDC Resistive
• Enclosure - Cover - Weather/UV/Flame Resistant High Impact Composite Base - Die-cast aluminum
• Environmental Specifications - NEMA 4/IP54 Rated Enclosure suitable for indoor or outdoor use with factory installed gasket when used with appropriate conduit fitting. Temperature range: 40°F / 120°F, 4,5°C/49°C
• Maximum Surge - 18 FPS (5,5 m/s)
• Minimum Flow for Alarm - 10 GPM (38 LPM)
• Service Pressure - 175 PSI (12,1 BAR) - UL
• 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
• Usage
  • Listed plastic, copper and schedule 40 iron pipe
  • Fits pipe sizes - 1", 1¼", 1½" 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" threaded Nibco CPVC, and one for 1½" threaded (Japan).

1144465 Specifications PDF