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  • anyone know about air con units?
  • Premier Icon zilog6128
    Full Member

    It’s about this time every year I regret not getting some sorted for our work unit over the winter 🤣 Obviously a split system is best, but I suspect most fitters will be quite busy at the mo! How much worse is a portable unit/units vented out the window, and roughly how many BTUs do I need for approx 1000 sq ft double height (we have a mezz floor)? 🤔

    Premier Icon DavidB
    Full Member

    I fitted an Innova unit myself in my garden office. They do not need external pumps and it was simple to fit.

    Premier Icon zilog6128
    Full Member

    @DavidB that does look nifty… £1700+ tho 😳 And I might need 2 of them. Where did you get it from, UK source?

    Premier Icon DavidB
    Full Member

    Got mine from this company

    https://www.orionairsales.co.uk/

    These guys were also recommended but I had issues with him not being able to confirm stock

    https://www.kdsupplies.co.uk/products/air-conditioning-unit-vision-2-3?taxon_id=67

    Premier Icon krixmeister
    Full Member

    Living in Scotland, I know nothing about UK air conditioning, but growing up in the south of the US my family and everyone I knew had A/Cs that fit in their sash windows.

    Is this an option for your use case? They aren’t the most efficient but should be able to handle your requirements, and are easy to install (if you have suitable windows).

    Something like this: https://www.orionairsales.co.uk/fujitsu-air-conditioning-amy-window-unit-69-c.asp

    Premier Icon zilog6128
    Full Member

    Got mine from this company

    https://www.orionairsales.co.uk/

    looks like they’re under a different name, but the same (or a very similar) unit, Powrmatic Vision, is that what you’ve got?

    That said, browsing their “easy fit” traditional split air-con range, I probably could do that myself… wall mounted units inside, core drill through the wall, external unit just sat on the floor in a cage.

    Is this an option for your use case? They aren’t the most efficient but should be able to handle your requirements, and are easy to install (if you have suitable windows).

    sadly not, looks like an easy & neat solution though!

    Premier Icon Ewan
    Free Member

    How big are the two holes you need to core drill – dimensions didn’t seem obvious from a quick glance…

    Premier Icon zilog6128
    Full Member

    if this is the same unit (looks extremely similar although different branding) it’s 162mm according to the tech specs, which is not too onerous

    https://www.orionairsales.co.uk/powrmatic-vision-31-all-in-one-dc-inverter-air-conditioner-and-heat-pump-31-kw–12000-btu-a-240v50hz-7498-p.asp

    Premier Icon FuzzyWuzzy
    Full Member

    The all-in-ones are a neat design if you only need one and can site it against an external wall but the split designs have more flexibility (and you can run multiple internal units from one external one with some models)

    Most years I get to the point of emailing local domestic fitters asking for a quote and lead times and the rare occasion I actually get a response, when I follow up to arrange a time for a survey visit I never get a response to that so just give up. Last quote (pre survey) quote I got was £2700 for a twin internal/one external unit (fitted) which seemed reasonable but they never got back to me when I said I was interested.

    Premier Icon zilog6128
    Full Member

    The all-in-ones are a neat design if you only need one and can site it against an external wall but the split designs have more flexibility (and you can run multiple internal units from one external one with some models)

    yes, this is the one I was looking at that doesn’t look too bad to self-install, one external unit & 3 internal
    https://www.orionairsales.co.uk/kms-air-conditioning-kms-3miox1c-m3-x-35kw-wall-mounted-kit-9kw30000btu-a-240v50hz-3917-p.asp

    The plus point of that all-in-one though I guess is it should be virtually silent compared to a conventional one, which are either loud inside the house for portable units, or potentially really going to piss off the neighbours for split systems! (only really a concern with residential installs though)

    Premier Icon thisisnotaspoon
    Full Member

    We use the all in one FRAL units. They do work, you definitely notice when they stop!

    How many you need depends on the building. Insulated portacabin with no windows and 1 person in it, not much.

    10 people in a tiny uninsulated container in the sunshine with windows and a maxed out 64A power supply, all the BTUs!

    Premier Icon Flaperon
    Free Member

    Been trying to find something to suit a dormer bedroom in a listed building and those Powermatic all-in-one things caught my eye. Been trying to figure out if they’d get sufficient airflow through ducting from vent tiles in the roof.

    https://www.roofingsuperstore.co.uk/product/manthorpe-double-roman-in-line-tile-ventilator-antique-red.html

    Obviously there’d be a loss of efficiency if drawing air in via the loft space, but I think it would work.

    Premier Icon thisisnotaspoon
    Full Member

    Obviously there’d be a loss of efficiency if drawing air in via the loft space, but I think it would work.

    Consider where you draw the air from. The loft space is likely to be pretty hot in summer. You’d do much better having the unit in the room recirculating the already cooled air, with the hot air exhausting to somewhere else.

    Trying to cool ~40C loft air down to 20C is a lot harder than trying to cool an already cool room (say 22C) down to the same. 10x more work is more than ‘a loss of efficiency!”.

    One will just cycle on and off to maintain a temperature. The other will just be running flat out as the incoming air is always above the target.

    Premier Icon Flaperon
    Free Member

    Consider where you draw the air from. The loft space is likely to be pretty hot in summer. You’d do much better having the unit in the room recirculating the already cooled air, with the hot air exhausting to somewhere else.

    It shouldn’t draw hot air into the room. Hot air from the loft would go over the heat exchanger, heat up a bit more, then exhausted out of the house. Cooler air drawn in through all the leaky holes in the loft to replace that taken by the unit for cooling the heat exchanger. Air in the room is untouched, just cooled via a separate heat exchanger.

    The efficiency loss is due to the smaller temperature differential between the heat exchanger and cooling air, but it doesn’t have to cool 40C air.

    Premier Icon 13thfloormonk
    Full Member

    BTU

    Well since we’re using ‘heritage’ units can we not use frigoria/hour? 😎

    (or is it kilofrigs? That one still crops up from time to time…)

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