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Rick Ridley
Rick Ridley, UK Heating Engineer
Category: UK Plumbing
Satisfied Customers: 2708
Experience:  30 Years on the tools, now retired, Ex CORGI
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UK Plumbing

how do you drain the primary circuit on a potterton performa

28 in order to fit... Show More
28 in order to fit service kit to diverter valve assembly
Submitted: 7 years ago.
Category: UK Plumbing
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Ask Your Own UK Plumbing Question
replied 7 years ago.
Hi I am Rick, UK Plumber, and I specialize on Boiler problems, and hope to get you back running asap with the minimum of fuss, If you look at the bottom of the boiler you will find service valves on the heating flow & return, turn these off and you will only have to drain the boiler, there is a small drain valve for the purpose, do not forget to turn off the electricity to the heating system first, and of course turn the mains inlet off as well for the domestic water, Regards Rick
Customer reply replied 7 years ago.
On the bottom of the boiler there are 6 copper pipes with valves from right to left according to the manual these are; Heating flow (22mm), Domestic hot water outlet(15mm), Gas inlet (22mm), Cold water inlet (15mm), Heating return (22mm) and Pressure relief valve (15mm). which of these should i turn off ?. Also according to the exploded diagram of the boiler there is a "drain off point" just behind the pressure relief valve, would this be the drain valve you are referring to ?
Rick Ridley, UK Heating Engineer replied 7 years ago.
Sorry for the delay had to pop out for a while, you need to turn off the 22 mm Heating Flow, 22 mm Heating Return, and the Cold Water Inlet 15 mm and you can either use the drain of behind the PRV or you can use the PRV itself, Rick

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