Sometimes, they do have locking pins that stop you from tampering with them; this is something you normally lift off. Or, it can be that the actual flow meter is seized. There is not a huge amount you can do, and you run the risk of damaging the meter, which can then cause leaks. I suggest getting a UFH specialist out to have a look at it.

The main reason for flowmeter failures, i.e. leaking, is product quality. They should last in excess of 10 years without problems. Other issues can be water quality in the heating system. Bacterial growth can cause premature failure in the O-rings.

@@MultipipeLtd many thanks for the helpful response. It does seem like quality is the issue, one was a leak at the base of the plastic housing, and two were hairline cracks along the side of the plastic housing. New to UFH, so very much appreciate the guidance.

MLC is the pipework we use it is a hybrid metal and plastic pipe which gives metal pipe benefits whilst being flexible like plastic. In terms of manifold Locations no matter the distance we would never recommend fitting below the UFH system as this can cause air pockets that cannot be vented.

@@MultipipeLtd thank you

Not quite. The boiler filter is more to stop sludge and silt build-up in the heating system over time, so it will run through the filter. It would be the same as using the boiler's filling loop. Of course, we would always recommend filling your system using the VDI 2035 standard and using desalinated water.

Many thanks for your message. This system is designed to buy into for professionals to offer all the benefits of hydraulic pressing. This makes it a perfect solution for plumbers and not for DIY installations or the DIY market. Plastic push-fit systems are good for most installations but have limitations. Also, most installers who move to MLC do so because they had a negative experience with push-fit systems.

No, most screeds and concrete are ok over underfloor heating systems. Just ensure you use a rounded aggregate. and ideally no deeper than 100mm

Screed at normal operating pressure, as when the screed is curing, you do get changes in pressure, so a lower pressure ensures you don't run into any issues.

Much appreciated.

if you send your project to us we can check the duty and ensure the bar on our manifold is good enough for the pump send to [email protected]

We can only advise in the UK but a actuator costs around £20 ish and take around 10 minutes max to replace. of course, finding a fault could take more time.

The best thing is to mark the actuators in the order they are. Then, unscrew them. Please ensure that when you put them back on, they return in the same order.

Thank you for the helpful advice, a follow up question please, how do I open the actuator ports as your video indicates they should be in the open setting@@MultipipeLtd

our units come with a non-return valve to stop it bypassing through the pump. if there is no means of isolation on the manifold that does make it difficult to do a fill procedure. I suggest getting isolation valves fitted between the pump and manifold unit.

sorry for the delay in our response. best thing to do is call our technical helpline to sort you out, the number would be on any multipipe paperwork, sounds like it need to be reset.

When filling the manifold the pump need to be off as this could damage it. Only during commissioning of the manifold it has to be connected to the heat source and the pump must be on.

yes, you have to make sure the torque rating of the actuator is higher than the valve. i.e. our actuators are 100nm of force and the pin is 90nm

glad you liked the video, the water has to be pumped in without air so you can get a simple pumped filling station (normally used in solar applications). You can then also add inhibitor/biocides etc into the tank making system dosing easier.

running a continuous acid solution in the your system would do damage so is not recommended. however, because heating water is not replaced, adding a simple inhibitor should help. but if you keep filling your system using the boiler filler loop this normally means you have a leak in your system and keep putting fresh water in your system will not help. lastly, you can drain your system fully then fill your system using deionised water which will help with limescale.

you need to always ensure the pump is turned off to avoid damage.

it is probably to do with too much primary side pressure from the boiler pump. you may have to fit a auto bypass valve to reduce the pressure against the valve. I hope that helps.

yes, this is normally fitted if the controls provided on the system does not have a pump delay, this is mainly for protection of the secondary manifold pump to ensure it does not pump against all closed loops.

​@@MultipipeLtd Ok, thanks. I understand why it might be required, but not the detail on how best to set it up. When 1 or more loops are open, you presumably don't want any water to go via the bypass. When all are closed, you want all the water to go via the bypass. How do you achieve that? What control is on that pipe - is it a pressure relief valve? I guess if the pump is pushing against closed loops, pressure goes up, and then that can release it via the bypass. If a loop is open, the water can freely circulate, so the valve will stay closed. I guess you would set the pressure to be that of the maximum pump output. Am I on the right track, or over complicating it? Perhaps it isn't based on pressure at all, but you always allow a trickle to go back that way? I'll ensure my system has a pump delay, but keen to understand in full what setup you have there. Thank you.

the hydraulics is the same if it is a standard branch system (a manifold just centralises the branches) we do recommend a auto bypass is fitted, to stop pump issues. but as more zones shut you may get boiler lockouts, without going down buffers it is hard to avoid this, good rad balancing can really help though.

it is best to mark them up (left to right) then remove them. as you are correct they close the valve.

@@MultipipeLtd thank you 👍

Absolutely!

Not yet! but thanks for the video suggestion we will add it to our list.

thanks for your message it is best to go through this with us. call us at the office on 01245227630 and we will be able to help.