Elson Sapphire - Drain Down and Refill Procedure

[Fountainspring]

I have an Elson Sapphire double feed indirect hot water tank and I need to drain down the system to move some radiators.

Would anyone be able to offer any advice as to the correct drain down and refill procedure for this tank?

It is a self contained boxed and insulated unit with a single cold feed cistern for the secondary Domestic Hot Water side, the primary indirect Central Heating feed and expansion tank seems to be internal to the boxed unit and isn't accessible.

From the schematic it looks like it has an internal vessel connected to the indirect coil which I am guessing deals with the Feed and Expansion.

The pipework connections for the tank are cold water feed to cistern, vent pipe from cistern, primary flow to indirect coil, primary return from indirect coil and domestic hot water draw off.

Any advice would be much appreciated!

 

[exedon2]

Just turn off feed to tank service valve if there is one or just tie up ballvalve.
Drain down as normal, you will have no hot water. If you're going to be a few days you could cap flow and return under tank. Reconnect when finished.
Under no circumstances use valves on flow and return!
Should fill up OK though they are know to airlock.

 

[Fountainspring]

Just turn off feed to tank service valve if there is one or just tie up ballvalve.
Drain down as normal, you will have no hot water. If you're going to be a few days you could cap flow and return under tank. Reconnect when finished.
Under no circumstances use valves on flow and return!
Should fill up OK though they are know to airlock.

Thanks for the reply, I followed your advice and it went soothly, filled up slowly then bled the gravity radiator and all the pumped radiators and balanced them up.

I don't fully understand how the F&E works though, from the schematic it looks like a vessel with a cone inside is connected to the indirect coil within the tank unit itself, could this be similar to a SPARTAN vessel? and do I need to be concerned about the formation of an air bubble?

Thanks.