Moonshine wrote in message . ..
It's that time of year when one's thoughts turn to the smoothe running of ones
CH system (sad isn't it!)

Before I go into all the details I'd just like to get some expert opinion on the
suitability of the the UPS 15-50 in my system.

The pump has been running for years on the medium setting, but I've always been
concious that the system didn't seem to be running right.

The radiators were not piping hot to the touch, the house didn't feel warm all
over, and the boiler does a lot of 1-2 minute cycling.

Turning to this group again over the last week or so for some tips, I've treated
myself to an IR themometer to do some proper investigation.

As I say at the moment I won't go into all the figures, but the info seemed to
sugest that the pump needed to be on maximum. I've been running it like that for
a few days and things do seem to have improved regards balance of heat even
running all the LSV's open until I'm sure what the state of play is.

My main concernes at the moment are I never see anywhere near 80 degrees C at
the input to the radiators, the boilier is cutting out when the ouput has
reached this temp. The max input to closesest rad to pump is around 70 and the
lowest is around 65. And the Boiler is still short cycling.

So before I try and rectify anything balancing like crazy I want to know if the
UPS 15-50 is powerful enough or not.

Cheers

Cliff


Cliff, I had exactly the same problems with a 15mm system. The
temperature of the water at the rad inputs is a function of the boiler
thermostat setting as well as the flow rate. I strongly recommend
balancing the system per recent threads here and the faq.

Initially I cranked my pump up to max to achieve the correct drop
across the boiler, but once the system was balanced, reset it to the
mid position. I then replaced it with a 15-60 Alpha + pump simply
because this new unit has an electronically controlled pressure output
to take into account thermostat valve operation around the house.

I was surprised at how much effect on temperature stability and boiler
cycling the balancing had.

Colin M