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Drain/refill procedure?
andrethegiant
Member Posts: 3
in Gas Heating
I have a natural gas boiler with an old style bladder less expansion tank.
I have made an image showing my system.
I'm looking to replace:
I cannot find any videos showing a system similar to mine.
I do not need specifics on replacing the parts just the procedure of emptying/refilling the water from the system.
Thank you in advance.
I have made an image showing my system.
I'm looking to replace:
- - Circulation Pump.
- - Zone Control Valve.
- - Pressure Relief Valve.
I cannot find any videos showing a system similar to mine.
I do not need specifics on replacing the parts just the procedure of emptying/refilling the water from the system.
Thank you in advance.
0
Comments
-
To empty the system is one thing. To fill the the system with water correctly would require a manual purge installed on your return piping. Do you have that?
Post a few pictures here of what you have, to get a better look.0 -
Shut off the cold water fill
Shut the boiler off
Manually open your zone valves
Drain the boiler
After it starts to drain and the pressure has dropped some you need to remove your air vent or open some radiator vents or open the expansion tank vent to let air in the system otherwise the water won't drain.
After it has drained and work is completed, reinstall any removed air vents, close the boiler drain and the expansion tank drain and close radiator vents. Open the cold water valve and refill the system. The system will have air trapped at the high points. Go around and bleed all the radiation. When all the radiators are bled start the boiler and pumps. Your high vent should remove the rest of the air but you may have to start and stop the system a few times and re-bleed the radiators to get all the air out. Put the zone valve back into auto mode when complete1 -
Thank you for your replies.
Fingers crossed.
0 -
I'm going to be done with the work tomorrow and plan to refill the system.
Most videos I have watched online show the return being shut off and water drained with a hose on the return before the circulatory pump.
I have no place to connect a hose apart from below the pump and on the expansion tank.
I guess I can bleed using the baseboard bleeder valves and the hy-vent on the return.
Would adding a drainage faucet above the circulation pump help remove air faster?0
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