Need to purge one circuit, Help please

[Post and beam]

Hi Wise ones,

One of my circuits is not flowing water, 12 total.

Is this plan the correct way to do this.

#1 Shut all the flow valves except the suspect one.

#2 Connect a drain hose to the Right hand side outlet where indicated.

#3 Shut the Cold return at the left hand side.

#4 Use water from the UVC upstairs via the manifold flow inlet at top left to flush through the suspect circuit. Out via the drain hose once the egress tap is opened.

 

I hope i have this correct but feel sure the collective will put me right if not. Here's hoping...

[SimonD]

On your inlet manifold you have you automatic air vent and underneath that you can connect a hose pipe to flush through from there. No need to disconnect your primary flow/return pipes.

[Russell griffiths]

The way your describing is fairly serious as though you think there’s some gunk in there, if you stop loops 1-11 does the flow gauge on 12 not start to move. 
having the whole system going through 1 loop should really whoosh it around. 
 

or have you done that. 

[Post and beam]

45 minutes ago, SimonD said:

No need to disconnect your primary flow/return pipes.

I dont propose to disconnect anything. I thought i could use the pressure/flow thats in the UVC. This is after all the same pressure as the mains inlet is it not?

 

I have not done anything yet. sanity check here first.

[SimonD]

38 minutes ago, Post and beam said:

I dont propose to disconnect anything. I thought i could use the pressure/flow thats in the UVC. This is after all the same pressure as the mains inlet is it not?

 

I have not done anything yet. sanity check here first.

 

All you need to do is close the isolation valves on the left hand side of the manifold, connect a drain hose to the return on the right hand side and then connect a supply hose connected to a tap to the flow side on the right hand side. Obviously close all the actuators on circuits that are working. That's what those connectors are for on the right hand side of the manifold. 

[Nickfromwales]

59 minutes ago, Post and beam said:

I dont propose to disconnect anything. I thought i could use the pressure/flow thats in the UVC. This is after all the same pressure as the mains inlet is it not?

 

I have not done anything yet. sanity check here first.

Miles off here, sorry! 
 

The water in the UVC is fresh potable water, which is hydraulically separated from the heating system ‘brine’, so that can only push water out of taps etc. 

 

You can turn the system off, then close the red and blue flow and return valves on the UFH manifold, and then connect a hose to the end of the return rail and run to outside or to a drain.
 

Then you’ll need another hose from an outside tap (or you can uncouple and use the filling loop) connected to the flow rail. 
 

You’ll then be using cold mains to blast the loop through. 

 

Shut the other working loops off. Leave the one problematic one fully open.

 

Open the drain off and then turn the outside tap on and watch / listen to see if water and air then gets dumped out.

 

Repeat as needed. 

[JohnMo]

Then once all working again, inhibit system with heating system inhibitor and biocide (same brand and type as previously used). Or if you have glycol, add glycol to the correct ratio.