jimbob12345

Hi thanks for all the replies, yes ive changed the filters. I have commissioned the unit now, i did use the internal radius of the anemometer in the end for my calculations. The fans, in particular the outlet seems to run at alot higher % than the inlet to balance the system, but ive tried to stop over thinking about it as there is nothing i can do about it. Im not going to start playing with the pipe work or replacing motors, as long as i have the correct flow rate and its balanced im happy. Thank you very much for the filter link, i will buy another caged set first so i can use the cage, gutted i only through it away a last week. Doh! I would like to drop the fan speeds for the idle setting as they are abit noisy, but i dont want to go too low and cause an issue again.

Ive also double checked building regs and it says those specs are for on boost, not saying your wrong, just what im reading

Yes i put it into commissioning mode at manually ran both fans at 100%. Thanks

I did try this to start with but the problem i had was that the bathroom Is the closest and kitchen is furthest away. I started in the kitchen and at 100% i could only reach 8 l/s but as the bathroom was closest that was extracting at around 18/s. This is why i did it the other way round.

Thanks for the advice. Well everything ive read says to commission the unit using the boost and these are the required specifications that are listed on manufacturers websites and on building regulations. Said that bathrooms 8 l/s kitchens 13 l/s and w/c 6 l/s, so i opened all the vents and slowly closed and reduced fan speed until i reached this setting. So my boost is now set at these rates. I then adjusted the inlets to match the total outlets. After this ive just reduced the boost by 15 % for my level 2 continuous mode. Obviously i may well be wrong, its only what I could find

Also the unit states it has an airflow of upto 76 l/s but im unsure if this is a combined efford from both inlet and out? If its just 1 way then im miles from this

Also just to add, i live in the u.k and have set my humity to 60% not sure where to set this. The handheld units are saying around 50% around the rooms in the house. Obviously the 60% setting is in the machine on the outlet side. So this 60% setting on the machine is keeping the house at around 50%, this does fluctuate alot as the mrs loves to hang washing from anything stationery in the house, to a point where im to scared to stay still for long periods of time.😆

Thanks so i have a titon 1.75 QPlus MVHR. Its an average 3 bed house new build house. Basically i took the front off the machine to find the outlet motor was smothered in thick thick mould Basically no longer functional. I have lived here for a year and a half with no known issues. So i managed to find my new home book pack and noticed on my commissioning forms that my address was written over tipex🤔. This made me very suspicious, so i purchased myself an add on touch screen display for the bedroom and noticed that the fans are only running at 18% idle speed and 85% humidity setting...... They had clearly never commissioned the system! The company that fitted it is no longer working and bellway had been a waste of time. Being a vehicle technician im used to fixing other peoples co#k ups. So i decided it woukd easier to clean the unit myself and commission it. So i have recommissioned this morning using 3.32 l/s per 1 m/s. I used my commissioning form i had. On boost 8 l/s bathroom 6 l/s w/c 13 l/s kitchen Inlets are looking good with an overall value of also 27 l/s 8.1m/s matched to the outlet. My only Unknown is to achieve to boost figure my fans are running at 85% outlet and 56% inlet. And to achieve a roughly 15 % drop for my balanced specified constant idle values my fans are 65% outlet and 45% inlet. 7 l/s bathroom Etc etc Should i look into why the motors are so far apart from eachother? Or is this completely irrelevant as the inlets will have much longer and 1 more pipe, so as long as this system is balanced and within specification it doesnt matter

Just to add if i use the calculation of 3.3 l/s per 1 m/s I struggle to get near where I should be when the fans are on full flow, but I can feel alot of flow of air, hence why I'm curious about the calculation of the wind speed.

Hi everyone, new to the forum, looking for some advice. Trying to commission my MVHR using my cheaply made anemometer using a funnel, car door seals and an aquarium pipe to make a good seal on the ceiling and anemometer . My Issue is that the device measures in M/S and I need L/S. Ive had a scroll through the forum and have seen that most people have posted on graphs that they use about 1 M/S as around 7 L/S. The issue is my anemometer has an internal radius of around 3.25 cm and 6.5cm diameter. Every online calculation i use is no where near 1 M/S per 7L/S. I was just wondering where to go with this and how people came to there conclusions and calculations. Surely the calculation should be done on the anemometer internal hole and not the ducting size. Thanks in advance