What is the purpose of the low limit in an aquastat?

The low temperature limit is meant to keep the water supply temperature from dropping too low. When the boiler shuts off after reaching the high limit, the system will continue to circulate water for as long as the thermostat is asking for heat.

When does the aquastat turn on and off?

Based on your setting of high temperature of 170 and a differential of 20, if your boiler temperature falls below 150 the Aquastat will initiate the boiler to turn on and heat until 170 and then turn off once this temperature is reached. By doing this if your home is heating properly it is considered normal operation of the Aquastat.

How to troubleshoot a boiler aquastat control problem?

Guide to diagnostic troubleshooting for heating boiler aquastat controls: this article describes common operating problems with heating system aquastat controls and how these troubles are diagnosed and fixed. We discuss aquastat problems such as improper adjustment, improper wiring, and relay buzzing or failures.

What does short cycling on an aquastat mean?

By doing this if your home is heating properly it is considered normal operation of the Aquastat. Short cycling is when the Aquastat switches on and off in rapid succession for no apparent reason without much variance in water temperature. My triple Aquastat relay is malfunctioning. I have purchased a triple relay burner circuit 120v.

How is an aquastat used to control water temperature?

It is used to control water temperature. Aquastats usually have a high limit temperature and a lower limit temperature. If the boiler is heating it will do so until it has reached the high limit and then automatically shut off even if the thermostat is indicating more heat is required.

What does the cut off temperature on an aquastat mean?

Still, on a simple boiler system, the aquastat will turn the boiler on and off based on the temperature settings of the aquastat. The cut-in temperature is the temperature at which the boiler fires at a low temperature reading by the aquastat while the cut-off temperature is the temperature at which the boiler cuts off as demand has been satisfied.

Do you have a problem with your aquastat controls?

We have no relationship with advertisers, products, or services discussed at this website. Guide to diagnostic troubleshooting for heating boiler aquastat controls: this article describes common operating problems with heating system aquastat controls and how these troubles are diagnosed and fixed.

Where is the reset button on the aquastat?

Unlike the aquastat shown at the top of this page, poking through the upper-center of the cover of this heating system control you’ll see a red ” reset button ” in the center of the upper portion of the gray control box.

How to know if your boiler aquastat is turning on?

Now while still calling for heat, check that the aquastat is sending 120VAC voltage to the burner (the two B terminals B1 and B2) confirming that the aquastat is trying to turn on the burner (oil burner) or trying to open the gas valve if it’s a gas boiler. This should be turning on the burner. 6.