GBNJ 0 Report post Posted May 29, 2015 I need help with wiring flow switches. I am replacing PA pressure switches with Suttner ST-5VH flow switches. Unit I am working on currently set up like this: from pressure switch I have three wires - blue, red and brown. Blue is capped off. Red goes to a lead on thermostat. Brown goes to Burner On/Off switch terminal twisted together with black wire coming out from the burner. I installed flow switch after unloader and VH means I can put it on in any direction allegedly. Flow switch has two wires - white and brown. In this situation where do I connect them? In the same spots where pressure switch was connected? (Burner on switch and thermostat). Thank you. Share this post Link to post Share on other sites
GBNJ 0 Report post Posted September 14, 2015 Well, all i had to do was to disconnect pressure switch wires and connect flow switch wires instead. Flow switch had white and brown wire. Didn't matter which one where - worked both ways. Unfortunately, replacing pressure switch with flow switch didn't solve my problem. When you have a leaky oring or downstreamer leaks a little back into the bucket, or your gun is worn out and seeps some water through - your unloader keeps cycling to try to build back the pressure in the line. Every time it cycles - burner kicks on for a second. I had hoped that if I use flow switch burner will not be kicking in when machine is in bypass and oring in the high pressure line is dripping. No luck, with flow switch if my PA VB10 unloader cycles in bypass and out - burner still kicks in. I guess there is more than 1 gpm of flow during that unloader cycle. Share this post Link to post Share on other sites
