How to Close Off a Zone on a Boiler

Getting to know a boiler is essential for proper water flow and energy conservation. Becoming familiar with your boiler involves identifying the open and close procedures for various zones. Radiant Floor Company notes that standard boilers come equipped with at least two zones — a fill zone and a release zone — suited for filling the boiler with water and draining water. Air may also become trapped in the tank, for example, causing pressure disruptions. Nevertheless, turning off one zone at a time is key.

Work gloves
Female brass hose connector
Garden hose
Adjustable wrench

Instructions

- 1
  Slide on a pair of work gloves to protect your skin. Identify the valves on your boiler. Find valve one (the "fill" zone), valve two (the "drain" zone) and the shut off valve — although either valve can function for fill or draining purposes. All three valves are displayed side by side.
- 2
  Connect a female brass hose connector to the end of a standard garden hose. Connect the opposite end of the brass hose connector to valve one. Tighten the connector with an adjustable wrench. Stick the opposite end of the hose into a sink or floor drain.
- 3
  Turn off the shut off valve. The shut off valve will disable the standard flow of water while circulating pump operations continue. Consult the water boiler manual for instructions specific to your model.
- 4
  Open valve one as far as it will go. Allow water to drain for 60 seconds. Close valve one. Draining water can help to release air caught in the associated zone, or as preparation for subsequent re-filling or dismantling.
- 5
  Remove and re-secure the hose onto valve two. Open valve two as far as it will go. Allow water to drain for 60 seconds. Close valve two.
- 6
  Remove and re-secure the hose onto valve three. Open valve two as far as it will go. Allow water to drain for 60 seconds. Close valve three. Continue with this process for as many valves — or zones — as your boiler is equipped.

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