Wiring Hayward OmniHub to a Pentair 250M Millivolt Heater

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hutchej

hutchej

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May 30, 2016
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Toronto, ON, Canada
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Hi there,

I'm planning my wiring for my upcoming installation of a Hayward OmniHub system. I'm trying to figure out where you connect the 'remote control' wires from the OmniHub to the heater in this wiring diagram. Anyone have any insights?

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Welcome to TFP.

Disconnect one of the wires connected to the PRESS SWITCH and connect a 2 wire 18 gauge cable from that wire to the heater relay in the Omnihub. Connect the other wire from the heater relay in the OmniHub to the PRESS SWITCH.
 
hutchej said:
Awesome thank you for your quick reply! The. I’m assuming you set the dial to the hottest setting so the OmniHub will always be able to turn the heater on.
Click to expand...

Correct. Turn both thermostats up to max.
 
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ajw22 said:
Correct. Turn both thermostats up to max.
Click to expand...
I've wired the two wire leads to the following locations on the heater. What I am noticing is the OmniHub is not properly controlling the heater and basically if the flow switch is triggered by the pump being at the right speed the heater will kick on if the switch on the front is switched to on.

I have a feeling one of my wires isn't connected to the correct spot (see pic) - black wire is connected to the wire that was plugged into the 'pool side' of the switch, the white wire is connected to the 'pool side' of the switch with all thermostat knobs turned up. When the switch is turned on to pool, the heater kicks on provided there is enough flow.

Open to your thoughts on what may be my issue!

IMG_1044.jpeg
 
Looks like it is probably from 2007.

The millivolt heater generates about 500-600 MV (millivolts DC) (0.5 volts DC) at the pilot generator.

You can break the line at the red, blue or green dot.

At red, the line is broken if you have Pool or Spa selected. You can select Pool or Spa and turn up the corresponding thermostat.

At blue, you select Pool and turn up the Pool thermostat.

At green, you select Spa and turn up the spa thermostat.


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hutchej said:
What I am noticing is the OmniHub is not properly controlling the heater and basically if the flow switch is triggered by the pump being at the right speed the heater will kick on if the switch on the front is switched to on.
Click to expand...

hutchej said:
I have a feeling one of my wires isn't connected to the correct spot (see pic) - black wire is connected to the wire that was plugged into the 'pool side' of the switch, the white wire is connected to the 'pool side' of the switch with all thermostat knobs turned up. When the switch is turned on to pool, the heater kicks on provided there is enough flow.
Click to expand...
It should work like you have it connected.

The problem seems to be on the Automation side.

Where are you connecting the wires on the automation control board?

Does the heater turn off if the automation is set to off?
 
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JamesW said:
It should work like you have it connected.

The problem seems to be on the Automation side.

Where are you connecting the wires on the automation control board?

Does the heater turn off if the automation is set to off?
Click to expand...
The heater is physically connected to the OmniHub Wiring Hub via the Heater LV1 (two wire) location on the control board. The heater does not turn off when you set it to off in OmniHub. If I adjust the thermostat down on the heater it turns off. If I turn the pump speed down to trigger the flow switch, the heater turns off.

Seems like an odd situation.
 
Do you have a multimeter?

Disconnect the heater from LV1.

Connect the multimeter to LV1 in continuity or ohms mode.

Do you see LV1 open when heat is off on the Omni and closed when you turn heat on?
 
hutchej said:
The heater is physically connected to the OmniHub Wiring Hub via the Heater LV1 (two wire) location on the control board.
Click to expand...
Can you show the part in the Omni manual where it shows where the heater needs to be connected?

Can you show a picture of the circuit board where the wires are connected?

Maybe you have it connected to the wrong terminals?
 
Thanks for all the quick replies folks. In service mode when I select the heater I can hear what sounds like a relay click on the OmniHub. I will take a multi-meter and see if it's open or closed and also try touching and removing both wires to see if anything happens.

The wiring diagram looks like this (see boxes in red). As I said the 2 wires are connected to LV1 (Heater) at the bottom of that Sensor wiring block. I will check again when I'm home tonight to make sure it's correct.
Screenshot 2024-07-31 at 10.41.14 PM.png
 
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Howdy folks, here are the details requested in a video and set of pictures. First picture is where the heater is connected (yellow square).
IMG_1082.jpeg
I disconnected the two wires from the heater and connected them to my multi-meter. This is a picture of what the multi-meter reads when the heater is set to 'off' in the controller and the pump is in a high speed setting:

IMG_1084 (1).jpeg
When I trigger the heater from the touchscreen the following happens:
IMG_1083 (1).jpeg
Not sure what this means but perhaps someone could give me some insights.

thanks!
 
You have the multimeter on the 2 AC Volts setting.

You want the test on the continuity setting which is the red box or a resistance setting which is the yellow box.

Put MM selector on the red box and observe what the display shows when the probes are not touching, which is an open reading, or when you touch the probes together, which is the circuit closed indication.

Do the same with the selector on the yellow box.

Then disconnect the wire from the LV1 screws and touch the probes to the LV1 screws and see what reading you get with the red or yellow selector setting.


mm.jpeg
 

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