Andehh Posted June 6, 2023 Share Posted June 6, 2023 We have a Vent Axia MVHR installed, and we have 3 x boost switches for the bathrooms to manually boost if (after your poo!). The MVHR was installed several months ago, and will be commissioned in a few weeks time. The MVHR installer is shrugging off the boost switch connections as he only ever installs the master one which comes with a Rj11 type connector & claims he isn't an electrician. Pisses me off this, but he won't budge. As a result my electrician needs to pick up the slack. However, my electrician is scratching his head a bit on the wiring for it, with the attached diagrams being all that is offered in the manual. Each boost switch needs 4 core cable, which is routed back to the MVHR. However, on the MVHR unit there is only 2 terminals per switch. Can anyone shed any light on this please? Boost switch: https://www.tradesparky.com/ecommerce/downloadasset?productAssetId=571966 Vent Axia Manual: https://www.vent-axia.com/sites/default/files/439817_ad.pdf Thanks! Link to comment Share on other sites More sharing options...
dpmiller Posted June 6, 2023 Share Posted June 6, 2023 why do you think you need 4-core to a boost switch? It only needs to be a momentary contact closure. Link to comment Share on other sites More sharing options...
Andehh Posted June 6, 2023 Author Share Posted June 6, 2023 (edited) Our installer said we could have one of the main controllers (with digital readouts) per room as long as we wired 4 core. He supplied the controller's, we installed the 4 core.... Now 6 months later vent axia confirmed it can't be done!! And a rocker switch off 2 core (as you've suggested) is all we can have. Why can't professional expert installers just do their job right first time. Grrr Edited June 6, 2023 by Andehh Link to comment Share on other sites More sharing options...
Blooda Posted June 7, 2023 Share Posted June 7, 2023 We have the same system, but went for the wireless boost switches, but never use them. The air clears pretty quickly, compared to traditional cr@p extractor fans, because of the constant supply flow. The unit takes care of boosting for showers with its humidity sensor. The wireless boost switches are bit 1980's so reside in drawers Link to comment Share on other sites More sharing options...
JohnMo Posted June 7, 2023 Share Posted June 7, 2023 If you have a momentary switch as suggested above, super simple cheap as chips. Switches couple of pound, two core cable of any size will do. We have them on all wet rooms, first months we used them, now almost never. And that's with the MVHR turned down considerably from initial commissioning settings. Link to comment Share on other sites More sharing options...
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