A: I would not use this low water cut off to replace the 400. Each heating system is unique and each contractor follows their own best practices when laying out the system control strategy. This control is used in a system that uses a 120 Volt control strategy for the low water cut off and the 400 is used on systems that use 24 volts. I think it would be much easier to replace like for like.
by|Nov 2, 2022
Q:Is there a difference between a Safgard 170 and a Safgard 170SV?
by|Jun 14, 2018
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A: No difference. In my review I reference a Safeguard 170. It was actually a Safegard 170 SV.
by|Apr 4, 2023
A: Safe guard 170 is a series. You really want to compare the model numbers. In this case 45-175
by|Mar 12, 2024
Q:operating voltage 24 volt or 110volts
by|Sep 19, 2016
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A: That is a great question and a source of a lot of confusion even for seasoned heating professionals. In my experience this is because they typically have experience with one low water cut off and one way of having it wired and repeat that process out of habit, not realizing there are more than one way to skin a cat. Thus I have always made it a best practice to ask the plumber and or the electrician, What specific brand and model of low water cut off do you feel comfortable using and I get them that one; regardless of other options. It just makes works better in the long run. Now to your specific question. This low water cut off is typically used on Water boilers now that a few states require them on all boilers. Steam boilers usually use a different model with built in time delays so that the fluctuation in the water level in a steam boiler don;t cause the control to shut the boiler off and on. The control will need a 120 volt power source however the control circuit can accomidate either 120 volt or 24 volt. If you would like to discuss this further please give me a call. Chris 978 651 3301
