What does an aquastat relay do?
The purpose of the aquastat relay is to provide a place for most of the controls in a boiler system to be wired together. Take the cover off and you’ll see pairs of screws that are labeled, for example, T-T, C1-C2, B1-B2 and L1-L2. These are called terminal screws. The label tells you what to wire in there.
How much does it cost to replace aquastat?
replace a boiler Aquastat relay – $ 700. replace inducer blower motor – starts @ $ 600. Replace contact Relay -start @ $400.
How do you troubleshoot an aquastat?
Reset or replace the circuit breaker or fuse if the Aquastat has completely lost power and the hot water heater is without power as well. Check the high limit set point if the water heater seems to turn off when the water is not very hot. The recommended set point is 140 degrees Fahrenheit.
What is the difference between aquastat and thermostat?
An aquastat does the same thing as a thermostat. But an aquastat senses and controls water temperature, whereas a thermostat does air. In hydronic heating we use both – the aquastat to control boiler water temperature, and the thermostat to control room temperature.
What causes aquastat to trip?
This device is called a “High Limit Switch” that will cut off air flow to the fire if the boiler gets overheated. How Does It Work? A High Limit Switch will ‘trip’ when it senses the outdoor boiler water jacket temp reaches 190 degrees.
What should I set my Aquastat at?
Recommended High-Limit Setting In most cases, the high-limit temperature setting on an aquastat should be between 180 and 200 degrees Fahrenheit. If the aquastat is set at 200 degrees Fahrenheit as the high-limit setting and the pressure valve begins to leak, set the temperature back to 195 degrees Fahrenheit.
What does an outdoor reset control do?
Outdoor Reset controls respond to changes in weather by changing the boiler water temperature circulating throughout the building. It sends out cooler water to the system during the warmer outdoor temperatures. And sends warmer water to the building in cooler outdoor temperatures.
What should aquastat be set at?
What is the purpose of the low limit in an aquastat?
The low limit is intended for tankless domestic hot water; it ensures that boiler water is always warm enough to heat the domestic hot water. Many aquastats also have a differential (diff) control which determines the size of the range around the low and/or high controls.