jeffr72 Posted February 11, 2012 Report Share Posted February 11, 2012 I have a HS Jetsetter and when I power it on, the jets/pumps pulse. Full force for a second, then dies down to almost nothing for about a second. This 2 second cycle repeats regardless of jet settings. I removed the filters and nothing changed. Anyone ever experienced this? thanks in advance. jeff Quote Link to comment Share on other sites More sharing options...
PreservedSwine Posted February 12, 2012 Report Share Posted February 12, 2012 What's the serial number? Fist few things that come to mind- it's losing it's prime, possibly from a defective air intake check valve that uses a bleedline running to a jet pump intake using the vacuum created by the jet pump to open and close the valve. It looks like a Tee- with two 3/4 inch lines, and a small 1/8" line on one end. Or... a low voltage due to an electrical run that too long, uses wire that's too small, or has a failure in the run, either a bad breaker or poor connection somewhere, where the voltage drops below the threshold that the jet pump relay will tolerate, causing the pump to intermittantly turn on/off. Or... something is stuck in the impeller. When the pump energizes, does it reach full power, or cycle off/onn before it reached full power? Quote Link to comment Share on other sites More sharing options...
PreservedSwine Posted February 12, 2012 Report Share Posted February 12, 2012 What's the serial number? Fist few things that come to mind- it's losing it's prime, possibly from a defective air intake check valve that uses a bleedline running to a jet pump intake using the vacuum created by the jet pump to open and close the valve. It looks like a Tee- with two 3/4 inch lines, and a small 1/8" line on one end. Or... a low voltage due to an electrical run that too long, uses wire that's too small, or has a failure in the run, either a bad breaker or poor connection somewhere, where the voltage drops below the threshold that the jet pump relay will tolerate, causing the pump to intermittantly turn on/off. Or... something is stuck in the impeller. When the pump energizes, does it reach full power, or cycle off/onn before it reached full power? One more thing- did you put the caps back on after removing the filters to ensure no air is getting sucked down a standpipe? Quote Link to comment Share on other sites More sharing options...
jeffr72 Posted February 12, 2012 Author Report Share Posted February 12, 2012 Serial Number is J2D1014 I believe it was purchased 11/02, I've owned it for 3 1/2 years. I opened the panel and on the left side looks like the lines your talking about. That's where all the "noise" is. I know the electrician that installed the tub, will ask him about the size of the wire. He's always been top notch so I expect it will be of decent size. Not sure how to check the impeller. When the pump energizes, it just about reaches full power, but spends more time building up pressure. My times are off a bit, probably a second-.and a half to cycle. I tried with caps on and off. They are always completely submerged. One thing to add. This problem began when the water level was low, flush with the top of the 4 neck jets. The water has been this low before without a problem. thanks, jeff Quote Link to comment Share on other sites More sharing options...
Dan.The.Spa.Man Posted February 13, 2012 Report Share Posted February 13, 2012 Try crimping off the small 1/8" line coming off of the T-valve and see if it stops cavitating. Quote Link to comment Share on other sites More sharing options...
PreservedSwine Posted February 13, 2012 Report Share Posted February 13, 2012 It's never letting go of the starting capacitor. If it's running 20 amp, 110v, check voltage with the heater energized at the main terminal block, then check voltage with the heater off (You might have to disconnect the heater if the water is too cold). I suspect you're losing over roughly 10% line voltage. You should only be losing 2-3% Quote Link to comment Share on other sites More sharing options...
jeffr72 Posted February 13, 2012 Author Report Share Posted February 13, 2012 When it was installed we set it up for 220. It also has its own breaker. If it's running 20 amp, 110v, check voltage with the heater energized at the main terminal block, then check voltage with the heater off Quote Link to comment Share on other sites More sharing options...
jeffr72 Posted February 14, 2012 Author Report Share Posted February 14, 2012 Checked w/my electrician, wiring was 10 gauge Quote Link to comment Share on other sites More sharing options...
PreservedSwine Posted February 14, 2012 Report Share Posted February 14, 2012 The wire size is adequate. Can you take voltage readings on the 20 amp 120v circuit at the terminal block while the pump is acting up? (should be terminals 2 and 4) Have you tried adding a little water? Is the wier door getting hung up, and the pump is just sucking in air? Also, as Dan suggested, try crimping the 1/8" air line on that little afc valve? Quote Link to comment Share on other sites More sharing options...
jeffr72 Posted February 18, 2012 Author Report Share Posted February 18, 2012 Hi, My apologies for taking so long to reply. I clamped off the 1/8 line and the pulsating went away. It seems like the pressure may be somewhat less than normal, but I'm not sure. What does this mean ? thanks, jeff Quote Link to comment Share on other sites More sharing options...
jeffr72 Posted February 19, 2012 Author Report Share Posted February 19, 2012 Is it okay to leave the 1/8" line clamped letting the hot tub cycle normally? Jeff Quote Link to comment Share on other sites More sharing options...
Dan.The.Spa.Man Posted February 21, 2012 Report Share Posted February 21, 2012 Sorry for the slow reply.....hard to follow things on here with all of the spam. Yes, it's ok to run it like that. There is actually a retrofit part that replaces that air-intake valve which looks totally different. The new part is called a Hartford Loop and sells for around $40. In the new kit there is actually a plug included which blocks off that 1/8" line altogether. Quote Link to comment Share on other sites More sharing options...
jeffr72 Posted February 22, 2012 Author Report Share Posted February 22, 2012 Thanks Dan, checks in the mail (grin). jeff Quote Link to comment Share on other sites More sharing options...
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