Grunff wrote:
new to diy wrote:
Ok, I've just bought an IR thermometer with laser guide (IR89 -
awesome) and have began balance my rads in earnest.

I have a choice of 2 rads which could be considered closest to the
bolier. One rad has a 4 degrees C drop across it (20-16) but the
other, get this, has an increase across it (21-27)?

I'll buy that rad off you!


Have the builders
put the wheelhead/lockshield valves on the wrong way round? Would the
central heating system still work ok if this were the case?

The majority of valves these days are not sensitive to the direction of
flow, and as such you can fit them either side. The system will still
work fine.


--
Grunff

IR thermometers are the work of the devil. They are *very* difficult
to use and even in the hands of an expert can often give misleading
results.

Firstly, apply some common sense. Touch the radiator, does it *feel*
like it's 20C? (That's room ambient for most rooms).

Next calibrate the meter. The instructions to do should have been
supplied and you will require an object of known temperature and with
the same characteristics in the IR range as your radiator. TBH it's
probably easier to measure the temperature of the radiator with a
proper thermometer then use that to calibrate the IR meter!

Finally return it to the shop.