Can anyone confirm if it is necessary to drain down the appliance when replacing the diaphragm.
I know it's necessary for the cold mains inlet to be closed and hot taps opened to drain pipes to diaphragm housing, but can't see any reason for draining appliance.
I know it's necessary for the cold mains inlet to be closed and hot taps opened to drain pipes to diaphragm housing, but can't see any reason for draining appliance.
