ive had an old pumped CH gravity HW system changed to an unvented indirect fully pumped, using the gravity 28's for a flow and return. they moved the pump from above the boiler and put it in the cupboard upstairs where the cylinder is. the ch and indirect coil are still header tank fed.
the problem ive got is there seems to be a large airlock in the 28's. the plumber seems reluctant to remove said air, saying its normal to sometimes have air in the system. the trouble is the boiler keeps cycling but the rads and hw don't seem to get very hot. in fact if we put the hw and ch on together the hw doesn't get very hot at all.
so whilst looking at the manual for the old boiler, I noticed the gravity connections are normally capped. would the fact they have used the gravity feeds instead of the ch flow and return cause the airlock/poor heat up that were experiencing?
heres a pic:
the problem ive got is there seems to be a large airlock in the 28's. the plumber seems reluctant to remove said air, saying its normal to sometimes have air in the system. the trouble is the boiler keeps cycling but the rads and hw don't seem to get very hot. in fact if we put the hw and ch on together the hw doesn't get very hot at all.
so whilst looking at the manual for the old boiler, I noticed the gravity connections are normally capped. would the fact they have used the gravity feeds instead of the ch flow and return cause the airlock/poor heat up that were experiencing?
heres a pic: