Jon Glanfield
15-12-2011, 07:24 AM
We have reluctantly inherited a block of 4 IDM GSHP units that have been installed in new build properties.
There are issues with all 4, but after a an initial cursory visit it looks as if balancing and set up will resolve the bulk of the problems on 3.
1 though is having major problems with DHW, in so far that the buffer is loading up to design temp, but then decaying very rapidly, almost as if the buffer plate is absent and is being mixed down by the CH circuits.
I have not fully checked the schematics yet to see if there is anything obviously amiss, but there is no secondary return, seemingly no leak, because the plate pump does not run/cycle, no thermal syphon feasible due to the plate and pump.
The buffer is 1000/50 litres and the HP is a Terra 15s. 2 other units on site are very similar but not subject to the same problems.
BF I know you have some experience of these have you or anyone else got any pointers before I get back on site?
There are issues with all 4, but after a an initial cursory visit it looks as if balancing and set up will resolve the bulk of the problems on 3.
1 though is having major problems with DHW, in so far that the buffer is loading up to design temp, but then decaying very rapidly, almost as if the buffer plate is absent and is being mixed down by the CH circuits.
I have not fully checked the schematics yet to see if there is anything obviously amiss, but there is no secondary return, seemingly no leak, because the plate pump does not run/cycle, no thermal syphon feasible due to the plate and pump.
The buffer is 1000/50 litres and the HP is a Terra 15s. 2 other units on site are very similar but not subject to the same problems.
BF I know you have some experience of these have you or anyone else got any pointers before I get back on site?