UL&FM Thread Type Water Flow Switch

Thread Type Water Flow Switch

 

WATERWISE VDRT thread type water flow switch with UL listed and FM listed is uesed in automatic water spray extinguishing system.they can be installed in main water supply pipe or brand pipe. They deliver flow signals of one area,Signals can reach electric contronal box and also can be used for starting fire water pump control switch.

1. This VDRT waterflow detector is designed to fit only the appropriate tee fittings.
NOTE: the outlet branch of tee must have a 1-inch NPT thread. Do not use a reducer to achieve the correct thread size. Failure to follow this instruction will result in failure of the detector to report a water flow condition.

2. VDRT units are shipped without the paddles mounted to the actuator. Select the correct size paddle for the tee being used. The appropriate nominal pipe diameter size is molded on the surface of the paddles. Align hole on stem of paddle with hole on actuator lever. Fasten together use a head screw supplied in bag assembly. Drive screw head through hole in paddle until it seats firmly to actuator lever surface. No washer is required. For paddle replacement refer to maintenance section.

3. Thread detector onto tee fitting and tighten with wrench. Use of thread sealant or tape is recommended. Use height gauge (in the bag attached) to ensure proper depth of detector on tee fitting. See FIGURE 1. Height gauge must fit between top of tee fitting and bottom of the seat. A gap between gauge and tee or seat is acceptable. When correctly installed, the detector must face in the proper direction of water flow and be aligned with the pipe. The provided directional cover illustrates flow direction for device.

4. Remove the cover. Move the actuator lever back and forth to check for binding. If the vane binds, remove the detector and correct the problem before proceeding.