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- May 23, 2015
- 35,139
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- Heating Engineer (Has GSR)
- May 23, 2015
- 35,139
- 1
- 14,996
- 113
- Member Type
- Heating Engineer (Has GSR)
There is a heat only boiler downstairs, the cylinder has 2 pumps, a cold mains to the tank on top, a cold main directly into the cylinder, a hot out into a blending valve where it mixes with the cold mains so it looks like a vented.cylinder but also an unvented cylinder??
There are no zone valves or expansion vessel /pressure relief but there is a pressure reducing valve on the cold going directly to the cylinder and blending valve.
The shower is.giving 22 litres per minute
There are no zone valves or expansion vessel /pressure relief but there is a pressure reducing valve on the cold going directly to the cylinder and blending valve.
The shower is.giving 22 litres per minute
M
Magnaman
My brother in law has recently bought a house with the same set up. In 15 years I have never seen one before. Like already mentioned, it is a thermal store-when I first saw it I wondered why a fortic had mains cold to it!!!!!!! The expansion is taken up like a fortic would be, quite easy to change over to unvented, although boiler will probably need replacing as well. Bro in laws house is only tiny so fitting a combi in the new year.
The cylinder contained the heating water (rather than the hot) the tank on top was actually the heating f&e tank.
The one pump pumped to the boiler, the other pump pumped to the rads. And the return from the radiators went back into the bottom of the cylinder.
The cold mains pipe went through the coil in the cylinder (as the heating water usually does) and then went to a TMV mixing valve where it mixed with the cold mains and out to all hot outlets at mains pressure.
There was also a large wiring centre / junction box.
Downstairs was an ideal classic and Drayton room thermostat.
Ripped it all out and fitted a baxi 33 duotec and a nest thermostat.
With regards to the.pipework, I connected [the pipe that had.the.pump to boiler ] to the return pipe from rads. And I connected [the pipe that had the pump to the rads] to the other pipe from the boiler
I capped off the hot and cold.
All working like a.dream.
The one pump pumped to the boiler, the other pump pumped to the rads. And the return from the radiators went back into the bottom of the cylinder.
The cold mains pipe went through the coil in the cylinder (as the heating water usually does) and then went to a TMV mixing valve where it mixed with the cold mains and out to all hot outlets at mains pressure.
There was also a large wiring centre / junction box.
Downstairs was an ideal classic and Drayton room thermostat.
Ripped it all out and fitted a baxi 33 duotec and a nest thermostat.
With regards to the.pipework, I connected [the pipe that had.the.pump to boiler ] to the return pipe from rads. And I connected [the pipe that had the pump to the rads] to the other pipe from the boiler
I capped off the hot and cold.
All working like a.dream.
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