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Prevent water heater freezing

water hreater freezing

Prevent water heater freezing

Add a freeze control circuit to water heater wires.
This would activate when temperature drops below 40F.
When you leave for vacation, turn off 30 amp switch, and then freeze control overides switch when air temperature drops below 40F

Freeze thermostat
30 amp switches
30 amp contactors

More about Contactors
Override T104 timer with freeze control
Add another thermostat to water heater

Add freeze control to T104 timer

Yiou can wire a separate freeze control
Or buy integral freeze control and contactor

Freeze thermostat
30 amp contactors

T100 timers
Freeze controls
How to wire T104 timer

Freeze control and contactor inside box
Freeze contals and manuals

Re-wire water heater for PID

Insert probe near lower thermostat.
Position against tank wall and cover w insulation

Wire thermostat and element as shown
240 volt line for water heater MUST be routed through ECO located on upper thermostat.
Why? Because ECO is safety device that will cut power to element in event of overheating.

PID is powrered by 120 volt for example.
Hot and neutral are needed for PID.
Set temperature controller program.
When temperature probe senses cold water, then PID activates contactor
Contactor switches 30 amp water heater circuit, and lower element tuns on.
Lower element keeps tank hot.
This wiring design, both hot wires to element are cut off by contactor.
Do NOT connect 240 volt 30 amp water heater circuit to PID... must use contactor

PID Temperature controllers
Digital temperature controller
30 amp contactors

Solid State Relay Board for Arduino

Select breaker and wire size
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Control water heater with programmable wall timer
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Control water heater with countdown timer
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