flow switch

[ron]

mark what is the purpose of a flow switch? If it fails what will the wash unit do or not do?
The switch im thinking about is the one thats on the out going side of my burner just above my downstreamer. I had a wireing prob. and want to make sure ive got it right.
everything works.

 

[oguard]

A switch of any type controls a circuit.

In most case a flow switch on a hot water unit is used to control the burner circuit. With the burner switch in the ON position and the trigger gun pulled (flowing) it will energize the burner circuit and turn on the heat. When you close the trigger gun (no flow) it will cause the burner circuit to turn OFF.

If things are wired properly you will get hot water only if the burner switch is turned on (if so equipped) and you have flow then turn off the burner when the flow stops. This is independent of any automatic on/off circuit if so equipped.

Hope this helps? Cheers.

 

[Mark]

Here is some data on the ST-6 flow switch:

**SUTTNER ST-6 FLOW SWITCH (MOUNT ANY DIRECTION), 3600 PSI, 8 GPM 3/8"MPT inlet and outlet.

The ST-6 flow switch is a "normally open" flow switch, designed to be mounted in a high pressure water line. Inside the housing is a floating magnet which is aligned parallel with a reed switch. When the water flow is initiated, usually when the spray gun trigger is pulled, the water flow forces the magnetto move forward. Once in the correct position, the magnet pulls the thin reeds together, closing the circuit and allowing electrical continuity. When water flow ceases, usually when the trigger is released, a light spring returns the magnet to its original position. The reeds then pull apart and open the circuit, stopping electrical continuity. Flow switches are typically used to turn a fuel solenoid on and off.

See next post for ST-5 series flow switch

 

[Mark]

**SUTTNER ST-5 FLOW SWITCH VERTICAL MOUNT,(3 WIRE) 8 GPM/3600 PSI 3/8" FPT Inlet & Outlet

Product Information

The ST-5 is a "normally open" flow switch, designed to be mounted in a high pressure water line. Inside the housing is a floating magnet which is aligned parallel with a reed switch. When the water flow is initiated, ususally by pulling the spray gun trigger, the water flow forces the magnet to move forward. Once in the correct position, the magnet pulls the thin reeds together, closing the circuit and allowing electrical continuity. When water flow ceases, usually when the trigger is released, gravity returns the magnet to its original position. the reeds then pull apart and open the circuit, stopping electrical continuity.

Advantages of flow switches:

* Mounts further downstream in pumping system than traditional vacuum switches, therby minimizing potential leak points that can cause vacuum switches to close.
* Vacuum switches use rubber diaphragms that often rupture and cause vacuum leaks to the pump
* Flow switches operate at a variety of pressures
* Flow switches eliminate the need to restrict water flow to the pump, thereby prolonging pump life
* the reed switch is encased in a protective glass capsule with a sealed nitrogen atmosphere that eliminates exposure to corrosive cleaning chemicals

Technical Notes
SPECIFICATIONS:

* Mounting Position: Vertical only
* Magnet Configuration: Free floting
* Pressure, Minimum: 75 PSI
* Pressure, Maximum: 3600 PSI
* Flow Rate, Minimum: 1.0 GPM
* Flow Rate, Maximum: 8.0 GPM
* Inlet: 3/8" FPT
* Outlet: 3/8" FPT
* Cord/Lead Length: 47 inches
* Weight: 16 oz.

WIRING INSTRUCTIONS:

* Lead #1 to Line/Power
* Lead #2 to Load
* Yellow with green tracer to Ground

Reed Switch Adjustment: depending on the system flow, it is normal for the magnet position to vary. This variance may require adjustment of the reed switch upon initial installation, especially at lower flow rates. If the switch fails to close upon initial flow, simply loosen the adjustment screw and position switch so it properly opens/closes according to flow conditions.

P.S. Both the Suttner Flow Switches as well as a few others can be found in our parts and accessories catalog.


[hand]

 

[ron]

ron p

thanks guys.