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Prevent water heater freezing
Prevent water heater freezing
Add a freeze control circuit to water heater wires.
This would activate when temperature drops below 40°F.
When you leave for vacation, turn off 30 amp switch, and then freeze control overides switch when air temperature drops below 40°F
Packard contactor
Buy:
Box mount freeze switch
Freeze thermostat
30 amp switches
30 amp contactors

Resources:
More about Contactors
Override T104 timer with freeze control
Add another thermostat to water heater
Add freeze control to T104 timer
You can wire a separate freeze control
Or buy integral freeze control and contactor

Buy:
Freeze thermostat
30 amp contactors
Freeze thermostat


Resources:
T100 timers
Freeze controls
How to wire T104 timer
>Freeze control and contactor inside box

Freeze contals and manuals

Packard contactor
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

Buy:
PID Temperature controllers
Digital temperature controller
30 amp contactors
Solid State Relay Board for Arduino

Resources:
Contactors
Select breaker and wire size
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How to replace water heater element Waste King disposal
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