dpmiller

how many Ah do you really need?

At three years you'd probably be OK but best look closely at them for signs of overheating- the UPS supplied with our Immunostainers (a nice Riello) isn't worked hard, but I've replaced four sets of batteries this year in 6yo systems, the individual 12v AGMs in the bank/box had been hot enough to meld together...

Nick, the Smiths/ Dimplex style fancoils have an NO stat which inhibits the fan until the HE is warm. After that point control can be either external or internal.

Moving on slowly... Spent a couple of hours on the site today walking round, looking, thinking. Tramping through loadsa sheep crap- the vendor has put some animals on it to lose the long grass for us, and it's made quite a difference even in only a week. Drainage looks good. There's been some pretty heavy rain the past while (noticeable field runoff on roads in the locality) And while the site is surface soft with some standing water in the low spots, the field drain is trickling away happily. I've pulled up the water main and the phone cable. There's an uncompleted joint in the water line on the other side of the long lane so I'll need to pop a coupler on and bury it but then we should have water. The phone will probably need splicing into the line coming down to the bungalow next door in the same spot. And the electric? Even better than anticipated. On inspection, the poles and overhead crossing the site are the 240v to the next farm, and both it and the underground to the bungalow are fed by an overhead from the transformer, over the neighbour's lane. Now where's those croc clips...

in this scenario surely you wouldn't need the motor valve on the return and just run the UFH pump off the thermostats?

the thermal shutoff valve, in your diagram. And does the fan coil unit have a shutoff valve inside it?

you're not using the microswitch atop the zone valve to control the pump?

more insulation above the ceiling.

isn't it true that the hemihydrate screeds don't suffer from laitance issues?

CPC have a massive range of this stuff, modular and assembled. this one doesn't have a phone sockethttp://cpc.farnell.com/global-communications/mswp/global-multi-service-wall-plate/dp/SE00284 and if you splash for a Loftbox or similar then all the multiplexing and sharing is done in one go. http://cpc.farnell.com/global-communications/loftbox-8-g/tvlink-8way-loftbox-psu/dp/SE00366?ost=loftbox&iscrfnonsku=false&ddkey=http%3Aen-CPC%2FCPC_United_Kingdom%2Fsearch

Land liability only for us, just yet.

tend to be a buck converter.

battery as in a series/ number of elements

Bought one of those 12v packs as a spare for my collated screwdriver. Admittedly I paid the princely sum of £7.99 but that got it to me in a couple of days from a UK vendor. Arrived darned-near fully charged.

Woo-hoo we own a field! our private laneway how the site looks now the view "from the front door" field drain. Note that the fence isn't the boundary here, rather the centre of the drain.

Rolled road planings maybe?

there are a number of them.

given that heat tends to rise is it maybe risky to assume that added heat within the room (bodies, appliances whatever) is going to start moving into the slab in a reasonable timeframe?

sadly it aint that simple with Royal Mail- business contracts can choose to include H&I or not and outside their contract charges get silly, apparently.

Pretty sure a car MAF sensor as mentioned by @SteamyTea will be faster still, I believe they can now see indivudual cylinder pulses. Many are now thin film rather than wire.

given the price these days (cpc are doing 600x600 40w for £22.50 plus vat) would it not be as handy just to buy office panels?

I've been thinking the same- a vent with a drop flap behind the cooker would be closed in normal conditions (mvhr positive pressure) but would open if the extractor was on or if a woodburner pulled too hard with it's door open.

Grant used to have a special probe for ambient air and coldrooms for the Squirrel datalogger which was basically a thermistor inside a ping-pong ball.

car thermometers have massive amounts of processing, to attempt to negate heat rising from the road surface . The thermistors used actually have a pretty good response so you might try tapping into the signal at the current one using a nice high-impedance ADC.

I can't be having tape on fresh compression fittings. If the nut is tight enough to have properly compressed the olive, any tape will have been sheared out of the contact area but if it hasn't it leaves a nice slippery surface. There's one particular brand of Autoclave I do a lot with and they tape every joint in the factory. By the time the instrument arrives here many fittings are so loose I can snug them by hand. I do like Slic-tite paste tho- sticks like sh*t to a blanket on any surface, fills gaps well, and lubricates also. In normal use it's non-setting but I had opportunity to open a joint on a steam generator that I'd made a few months previously (sustained 145c) and it had dried out a bit like glazing putty.