Blog / system

Filling & Pressurising the UFH system

by UFH1
A test is performed at a pressure of 5 bar before flooring, screed or biscuit mix is laid to check for leaks and ensure the pipes are at their most expanded. This pressure is to be maintained until screed application is completed in order to ensure that any leaks are identified immediately and prevent the screed cracking later. 6 bar is a lot higher than a system would normally run.This action can be pressurised for testing purposes with mains water in most cases. REMEMBER: You must be extremely careful to avoid frost unless anti freeze has been added to the water. The flow from the mains tap to the filling point on the flow rail (red) of the manifold and the return/waste hose connected from the drain point of the return manifold (blue) to somewhere the return water can drain to.
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Commissioning the System

by Damien Wilkinson
1. Check that all flow meters are open. Turn them anti-clockwise a couple of turns from closed2. Switch the programmer for zone 1 so that it is calling for heat, you should see a flame signal.3. There should be no actuators fitted on the manifold, the manifold pump should run and the zone valve should open (if one  is fitted).4. The boiler should fire up at this stage and the system should circulate water. Turn the flow meter on all circuits until the plastic indicator is around 1.5 (if using a boiler) or 1 for heat pump systems. The flow meter scale works down, so allowing more flow (like opening a tap) moves the red indictor down. As each are adjusted, some  you may have already set may alter slightly. We find that it’s best to alter in small increments.5. Turn the zone 1 room stat up to it’s highest temperature.
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