OmniHub not controlling Jandy heater

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borski

Member
Jun 27, 2020
8
Cupertino, CA
Hi there!

I'm new here, and just bought this wonderful house in Cupertino with a sizable pool. It originally had solar heating installed, but my fianceé has Raynaud's, so I decided to have a gas line run and put in a gas heater in addition; while I was at it, decided to put in a new VS pump and automation system.

It's a Hayward VS 950 pump, with the OmniHub automation system. The heater is a Jandy JXi400 w/ VersaFlo Bypass. They're connected via the 2-wire remote tstat option. I see the "remote tstat" flashing when I turn on the pool heater, but if I turn up the temp to 104 on the Jandy heater (what PB and the manual recommended in order to use the remote tstat connection), it just keeps heating up to 104, no matter what the OmniHub has the temperature set to. The OmniHub appears to be unable to turn on and off the heater, despite being configured.

Happy to provide any additional info!

Any ideas? Thanks!
 
Check the wiring with a multimeter and confirm that the heater control circuit is opening and closing at the heater.

Or call the installer back to fix it n
 
Maybe this is a dumb question, but: the heater stays on in Pool Mode, and the OmniHub will spin up the pump to the required minimum whenever it senses it needs to heat; the problem is, if I run the pump at the required minimum, the heather is always going to heat. To be clear, the OmniHub should have some way of turning the heater on and off, rather than just relying on the heater's "low flow" switch to not heat when its skimming (which is at a lower speed than the heater requires), right?
 
The OmniHub should only have the heater circuit closed and the heater running when the pool temperature set point is not met.
 
@ajw22 Okay, that makes sense in theory, but I'm not exactly sure what that means in practice; does that mean that right now, if the pool is at the pool temperature set point, and I manually spin up the pump to 70% say (the minimum for the heater to run), then the gas should *not* turn on?
 
borski said:
@ajw22 Okay, that makes sense in theory, but I'm not exactly sure what that means in practice; does that mean that right now, if the pool is at the pool temperature set point, and I manually spin up the pump to 70% say (the minimum for the heater to run), then the gas should *not* turn on?
Click to expand...

That is correct.

If pool actual water temperature is 80 and heater setpoint in OmniHub is 78 then the heater should not be turning on.

You have a short circuit in the wiring from the OmniHub to the heater keeping the heater always on.
 
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See what I said in Post #4. It could be in the wire or a stuck relay in the OmniHub or a strand of the wire at a connector shorting to the other wire. With a multimeter you can figure out what is going on pretty quickly.
 
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