AirCon unit - wall mounted and external pump

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Like many with the current weather, looking at some form of AC.

Myself, not looking for a unit fitted in many rooms etc.
The house, a 4 bedroom det. Gas central heating with boiler and HW cylinder and radiators in all rooms controlled by Hive, lounge has full sun and kitchen full shade with a hallway in the center of the house between them.
The hallway has the stairs, which climbs halfway onto a landing then doubles back onto the bedroom floor landing.

As said not looking at multiple room installations, just enough to gentle chill in summer and gentle warmth in winter as and when needed.
Thought of a single unit fitted above the middle landing window, serving ground floor in summer and 1st floor in winter as cold air drops and warm air rises.

Read that pre-filled units can be installed as DIY, providing the supplied pipes are not tampered with. So in fitting the wall unit as where intended and the pump externally at ground level at the distance needed by the length of the supplied pipes.

In doing that would I still need a F cert installer and would the positioning of the wall unit be ok, with all the rules and regs etc. Is this feasible or should I look at ground floor in hallway which could be more difficult for the pipe runs etc.
How would you calculate the approx btu required bearing in mind, not looking for full on chill.
 
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Reading that a pre-filled unit can be installed as a diy providing the pipes are not tampered with, shortening the pipes etc.
If the system was installed as per the pre-gas unit instructions with the distance between the wall unit and external unit kept so the pipes fit without tampering. Then the connections ‘soap’ tested for leaks.
Would a f-gas engineer still need to certify the system, whether it using R290 or R32 refrigerant.
 
Reading that a pre-filled unit can be installed as a diy providing the pipes are not tampered with, shortening the pipes etc.
Theoretically possible.

In reality the pipes will not be the correct length, and you will be far better just getting some F-gas person to install a proper system.
 
Ok.
Can anyone explain why a f-gas engineer has to pass a installation when such R290 refrigerant is not a fluorinated gas (F-gas).
So the R290 as read does not come under the same regs etc. being a propane ?
The A3 cat is same for propane as used and installed with cooking, heating etc in boats, caravan and bbq where any competent person can install equipment using propane.

Correct me if I’m wrong ‍♂️
 
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I'm not implying this will work for you, but I have a ducting system I designed that exhausts warm air from the considerably hotter side of the detached house to the cooler side and thus keeping a fairly acceptable and almost even temperature. The work was done before a full house redec so any chopping/ making good was completed before the paint cans were opened (y)
 

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