A Guide To Hydronic Zone Valves

Are you able to run your hot water system according to your choice or not

? After switching off the thermostat, do the hot water still flows through the hot water heating system? In case such things are noticed then it means that the hydronic zone valve of your heater has failed.

Hydronic zone valve is always used in conjunction with your home's thermostat, circulating pump and boiler. For controlling the flow of hot water through your hot water heating system, normally hydronic valve is used.

These valves are used in most of the heating systems because they are very simple devices. If the heating system has multiple zones then it enables the multiple thermostats to be set at different temperature in different rooms. It makes the things convenient for people as they can adjust the temperature as per their need.

Zone valves are generally controlled through thermostat. They need to have a 24V AC power supply source that is usually fixed near to boiler. With the turning on of thermostat, zone valve helps the hot water to flow through the water heating system.

But if not cared properly, there are chances that the hydronic zone could fail in open position. When this failure occurs, hot water keeps on flowing through the water heating system, without caring for the thermostatic conditions. As a result, boiler runs continuously and may get burnt. So better is to turn off the boiler and call a plumber.

On the other hand, if the hydronic zone valves fails in closed position then hot water will not at all flow regardless of thermostat settings. To prevent this situation, it is always advised to install multiple zones and circulatory pumps into the hot water heating system.

If you will have multiple zone valves then it will solve the problem of freezing in extreme winters. The basic reason behind this is that on the failure of one heating zone, others would be functional and would prevent the freezing.

Repairing a hydronic zone valve is not very difficult to do. In many models, you can not replace the valve but the electric motor assembly or power head that constitutes the upper portion of the hydronic zone valve can be swapped out with a replacement sub assembly.

by: Scott Rodgers.

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