Hi, Hope you guys can help me out.
Two problems:
My system:
Pandora Heat Bank which does the DHW. Its max temp is set at 75c and minimum at 65c. The DHW from the Heat Bank is set to on from 6am to 12pm and 3pm to 9pm. the Grundfoss pump on the return at the Heat Bank is set at speed 2.
I have a Vaillant 637 System boiler that does the CH. The pressure in the boiler is set at just over 1 bar and the stat on the boiler is set to its maximum (75c).
Problem 1.
The CH stays on for most of the day (at present) and is controlled by a Danfoss Stat set at 20c, as a result I have noticed the Heat Bank is extremely slow in warming up. The first person to use the shower normally at around 8am gets good heat however the second user even after 1 hour gets at best warm to luke-warm water. I have noticed the temp on the Heat bank after the second shower to be as low as 45c. On average I have recorded that the Heat Bank takes 1 hour to get from 45c to 55c. What could be the problem? Any help would be appreciated. To help - during the Summer when the CH was off - I did not notice any problems and we seemed to get piping hot water consistently!
Problem 2.
The Vaillant 637 boiler (37kw) runs 16 rads over 3 zones split equally) I do however notice a lot of cycling - can anyone help me resolve this issue.
To all thanks in advance for your help.
Pat
Two problems:
My system:
Pandora Heat Bank which does the DHW. Its max temp is set at 75c and minimum at 65c. The DHW from the Heat Bank is set to on from 6am to 12pm and 3pm to 9pm. the Grundfoss pump on the return at the Heat Bank is set at speed 2.
I have a Vaillant 637 System boiler that does the CH. The pressure in the boiler is set at just over 1 bar and the stat on the boiler is set to its maximum (75c).
Problem 1.
The CH stays on for most of the day (at present) and is controlled by a Danfoss Stat set at 20c, as a result I have noticed the Heat Bank is extremely slow in warming up. The first person to use the shower normally at around 8am gets good heat however the second user even after 1 hour gets at best warm to luke-warm water. I have noticed the temp on the Heat bank after the second shower to be as low as 45c. On average I have recorded that the Heat Bank takes 1 hour to get from 45c to 55c. What could be the problem? Any help would be appreciated. To help - during the Summer when the CH was off - I did not notice any problems and we seemed to get piping hot water consistently!
Problem 2.
The Vaillant 637 boiler (37kw) runs 16 rads over 3 zones split equally) I do however notice a lot of cycling - can anyone help me resolve this issue.
To all thanks in advance for your help.
Pat