I would use two 40amp contactors in series with the 2 pole breakers and then cycle them with the Time clock. The time clock can't handle the amperage but the contactors can. You can use 240 volts to power the time clock or 110 volts and then you will have to match the coil voltage of the contactor to the power you use for the time clock....... and cycle both contactors at the same time with the time clock......Hope this helps. As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician or HVAC tech to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
You probably could but my question would be "why?" Water heater timers are made to turn power off to waterheaters during the times that we dont need hot water, like in the middle of the night or while you are at work. This keeps the hot water heater from working during those times and wasting energy (gas or electric). Tankless water heaters already have this builtin because they only work when you actuallty turn on the hot water. If the hot water faucet is not turned on, the tankless heater never comes on. It does not use a bit of energy until the hot water is actually turned on. So it will not be using energy during the night or while you are at work. So there really is no reason to do what you are thinking about unless you have another reason that I cant think of. Tankless heaters are great and this is why they save 60% of energy of conventional tank heaters.
if you are going to do what you want to do you are going to have to use two timers, one for each of the 40 amp circuits and set them at the same times. However this is still unnecessary because the heater will still not turn on until water is flowing through it anyway.
I want to used for swimming pool. I want the timer to turn power ON for heater after pool pump start. I want the timer to turn power OFF for heater before pool pump is OFF
My idea make sense to you?
no sir.. no offense but it doesnt. There is no point in it. I totally understand what you are trying to do, but there is really no reason to do it. If it was a conventional water heater than I would say "sure thats a great idea! that will save a lot of energy and money." But these tankless do not work the same way and your heater will never come on until there is water pumping through it. And when the pump is not pumping, the heater will not work. The heater turns on by a flow switch that senses the waterflow coming through the pipe, If water is not flowing, it is off. If water is flowing, it turns on. This w/h is already going to do what you are trying to make it do.
ok, now I understand. If your water heater isnt controlled by a flow switch then you will have to use two timers, one for each 40 amp circuit as I stated earlier. There may be other ways to do this but they would be more costly and would require professional installation.
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I want to used for swimming pool. I want the timer to turn on power after pool pump start and turn power off before pool pump is off.
Mr. rrreddd tank you for the efforts to make me understand how tankless heater work, but my tankless heater is home build and has no flow sensor, so when pool pump is ON water flow .ALL I want is to DELAY POWER to heater. Is there another way to do it? I repeat NO FLOW SENSOR. The components of the heater are: 2 9kw elements,2 TOP thermostat for electric heater and relief temperature-pressure valve installed ON HOT WATER LINE. TANK YOU.
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