Hi
We've got a DIY man in at the moment who's fitting a new bathroom and he has unfortuantely caused a problem with our central heating/domestic water.
Basically our system is slightly complicated (because of the size of our house). We have two Vaillant VC GB 242 EH system boilers, both joined together, that purely heat the central heating downstairs/upstairs in our house (35mm copper piping). Our domestic hot water is heating by a 400 litre Everhot mains pressured cyclinder that runs on Economy 7. In order to fill our central heating system, there is a 15mm filling loop on the mains entering the Everhot cyclinder at the bottom connected to a flexible pipe with an isolation valve and a non-return valve.
The DIY guy was removing some of the bathroom fittings (shower/bath etc.) and we think that he turned off the cold water mains supply to the house, closed the stop cock to the Everhot cylinder (which is after the tee off to the central heating fill pipe), BUT opened the isolation valve by mistake.
The hot/cold water smelt funny and was a browny colour (central heating water) this morning so I go a plumber in to have a look. He quickly realised what was happening when the central heating pump was running dry and hot water was flowing through the cold water pipes in our house even though he turned off the mains supply to the house. The non-return valve was not working!
He has recommened running the cold water taps for 12hrs to clean them out, but I'm concerned that there were a load of inhibitor chemicals recently added to the central heating and these have ended up in the cylinder (domestic hot water). I have done a test with our swimming pool (chlorine/bromine/alkainity/pH) test kit on the hot cold water and the cold water appears normal (only useful reading is the pH at 7.2) but the hot water is 6.8.
Any ideas what to do?
Thanks
We've got a DIY man in at the moment who's fitting a new bathroom and he has unfortuantely caused a problem with our central heating/domestic water.
Basically our system is slightly complicated (because of the size of our house). We have two Vaillant VC GB 242 EH system boilers, both joined together, that purely heat the central heating downstairs/upstairs in our house (35mm copper piping). Our domestic hot water is heating by a 400 litre Everhot mains pressured cyclinder that runs on Economy 7. In order to fill our central heating system, there is a 15mm filling loop on the mains entering the Everhot cyclinder at the bottom connected to a flexible pipe with an isolation valve and a non-return valve.
The DIY guy was removing some of the bathroom fittings (shower/bath etc.) and we think that he turned off the cold water mains supply to the house, closed the stop cock to the Everhot cylinder (which is after the tee off to the central heating fill pipe), BUT opened the isolation valve by mistake.
The hot/cold water smelt funny and was a browny colour (central heating water) this morning so I go a plumber in to have a look. He quickly realised what was happening when the central heating pump was running dry and hot water was flowing through the cold water pipes in our house even though he turned off the mains supply to the house. The non-return valve was not working!
He has recommened running the cold water taps for 12hrs to clean them out, but I'm concerned that there were a load of inhibitor chemicals recently added to the central heating and these have ended up in the cylinder (domestic hot water). I have done a test with our swimming pool (chlorine/bromine/alkainity/pH) test kit on the hot cold water and the cold water appears normal (only useful reading is the pH at 7.2) but the hot water is 6.8.
Any ideas what to do?
Thanks