cylinder change on johnson and starley j25-32 mk3 modairflow

[ahtplumbing]

Hi,

I have been asked to change a indirect cylinder that is plumbed in to a johnson and starley j25-32 mk3 modairflow warm air. I was expecting to find a feed and expansion tank in the loft for this system, but there isn't one. Can anyone please tell me how I can drain down/refill the system so I can change the cylinder.

Thanks in advance

 

[Plumb Ugly]

Its a seperate cylinder rather than a water heater built into the warm air unit then?? Sounds odd can't see how that would work

 

[Plumb Ugly]

Sure its not a direct cylinder with a feed tank on top?

 

[michael c]

Hi,

I have been asked to change a indirect cylinder that is plumbed in to a johnson and starley j25-32 mk3 modairflow warm air. I was expecting to find a feed and expansion tank in the loft for this system, but there isn't one. Can anyone please tell me how I can drain down/refill the system so I can change the cylinder.

Thanks in advance

is there a drain off in the warm air unit or on the cylinder. I would shut off main stopcock and drain cylinder that way.

 

[Dsgas]

There is no feed and expansion tank to central heating side of system due to it being a primatic cylinder (single feed). there should be a cold water supply to cylinder from a storage cistern.

 

[Citiheat]

To replace, you will need to fit a cylinder suitable for gravity systems (Not as common as you would think) and fit an expansion tank.