Wiring Diagrams and Relays.
my coworker has been helping me with schematics and giving me prompts to try and create them. This one I am stuck, I have to heat 3 indirect heaters off of 1 circulator pump. I am genuinely confused how the hell do I turn on the pump? I don’t know why electrical for me is so daunting at times. What device do I use so that when the aquastat makes it opens the zone valve and starts the pump.
Thank you for your help.
Comments
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the tstat calls for a zone
The zone valve opens and The end switch closes and starts the boiler
An aqua-stat senses hot water and starts the circulator.
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that makes sense practically. This usually is all done via the zone valve control board or so. Though for this schematic I’m assuming the aquastat would make an end switch that brings on the pump.
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then you’ll circulate cold water. But it can be done.
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This is a simple "take it one at a time" exercise.
Forget the zone valves for now. The First step is to determine how the circulator operates if there was only one thermostat in the system like a one zone house radiator system. That is usually built into the heater itself. Here is the Weil McLain simple diagram that turns on the burner (Green) and the circulator pump (Blue) with the call for heat from the thermostat (Red)
Here's one for an oil burner combination aquastat relay.
See how the thermostat (Red) operates both the burner (Green) thru the limit and the circulator pump (Blue) to move the water thru the system? Easy Peasy!
Now lets look at a zone valve manufacturer's diagram
See how the thermostat (in your case the water heater aquastat) turns on the zone valve? Once the zone valve is open the end switch closes and will send the thermostat call for heat to the boiler control. You don't need a relay to do that. The zone valve end switch is all you need to operate the burner and the circulator.
Here is your diagram if you have Honeywell V8043 type zone valves
Hope this diagram helps
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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jeez I appreciate this a million thanks.
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Oh that is too much. A thousand thanks will be just fine! I will send you my Venmo account info in a PM.
Just take wiring diagrams one small part at a time. One circuit at a time. Make the complete circuit from the power source, the the load and the return path back to the power source. All thise switches and contacts on the way are just on and off switches to make the load operate or stop the load from operating. In a zone valve with an end switch there are two circuits. The one from the transformer to the thermostat to the valve motor and return path to the transformer. The other circuit has the source somewhere else, like the heater for example. The end switch is just one of the contacts that open or close to make the heater operate.
Take each step one at a time and the wiring diagrams get easy.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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@EdTheHeaterMan said it right: "Take each step one at a time and the wiring diagrams get easy."
Break the schematics down into smaller pieces & follow the current with your finger. We don't do complicated things, just busy things.
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this is a good intro to hydronic controls and wiring
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream1
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