B
bushymusic
Hi all,
I have a conventional close-coupled open-vented heating system comprising of wall mounted boiler in kitchen a Potterton profile 80,
Thermostat in the hall,
Airing cupboard on landing with the following:
Hot water tank
Honeywell 3 port valve V4073A
Potterton EP2000 programmer set to so that you can only have two options –
HW or HW + Ch (no CH only)
So 3 port valve moves between A-HW and AB-mid position and not B –CH only.
close-coupled configuration of open-vented and cold feed pipe work set 150mm apart that both go straight up to the loft & expansion tank above.
grundfos 15-60 pump place below and after the cold feed, pointing down.
I have 10 radiators, 5 standard size on upper floor, 3 5ft tall rads on ground with the last two in the run standard size again.
My problems are:
1. Within 20 minute of calling for hot water and central heating cavitation or kettling starts noisily in open vent pipe work in airing cupboard then continues for duration.
It did use to pump over into expansion tank but I raised the pipe work to stop this in the short term to stop it steaming.
2. Last three radiators on ground floor are a BIG PROBLEM as they take 1 hour to partially warm in the morning, if at all.
Pump is set to maximum (3).
3 port valve in mid position so flow is split.
I can work around this if I Water then travels around CH only and all radiators are very hot.
All pipe work and pump/3 port valve very hot to the touch in airing cupboard.
Air constantly in highest radiator so needs bleeding every few days.
Had an engineer look at it:
He recommended and carried out following:
Changed pump
Power flushed system
balanced rads/ showed me trick of close off valve on the coil of the hot water tank.
No change all problems remain.
Any recommendations?
Cheers,
David.
I have a conventional close-coupled open-vented heating system comprising of wall mounted boiler in kitchen a Potterton profile 80,
Thermostat in the hall,
Airing cupboard on landing with the following:
Hot water tank
Honeywell 3 port valve V4073A
Potterton EP2000 programmer set to so that you can only have two options –
HW or HW + Ch (no CH only)
So 3 port valve moves between A-HW and AB-mid position and not B –CH only.
close-coupled configuration of open-vented and cold feed pipe work set 150mm apart that both go straight up to the loft & expansion tank above.
grundfos 15-60 pump place below and after the cold feed, pointing down.
I have 10 radiators, 5 standard size on upper floor, 3 5ft tall rads on ground with the last two in the run standard size again.
My problems are:
1. Within 20 minute of calling for hot water and central heating cavitation or kettling starts noisily in open vent pipe work in airing cupboard then continues for duration.
It did use to pump over into expansion tank but I raised the pipe work to stop this in the short term to stop it steaming.
2. Last three radiators on ground floor are a BIG PROBLEM as they take 1 hour to partially warm in the morning, if at all.
Pump is set to maximum (3).
3 port valve in mid position so flow is split.
I can work around this if I Water then travels around CH only and all radiators are very hot.
All pipe work and pump/3 port valve very hot to the touch in airing cupboard.
Air constantly in highest radiator so needs bleeding every few days.
Had an engineer look at it:
He recommended and carried out following:
Changed pump
Power flushed system
balanced rads/ showed me trick of close off valve on the coil of the hot water tank.
No change all problems remain.
Any recommendations?
Cheers,
David.
