Barney12 Posted May 21, 2017 Share Posted May 21, 2017 So, my gshp unit for the mhrv has arrived. The instructions are almost non existent, not even so much as a parts list! It all looks fairly self explanatory but I've got two questions. What is this? It was in the box assembled together but appears to be a set of non-return valves? Possibly for the expansion vessel? My next question relate to this set. Left (with the arrow) is an outlet which I believe should be connected to a tundish and drain as its after a pressure relief valve. Strangely though the instruction don't show or make any mention of anything being connected to this outlet. No blank plug/cap is supplied. Seriously underwhelmed by this particular purchase so far! Link to comment Share on other sites More sharing options...
Triassic Posted May 21, 2017 Share Posted May 21, 2017 (edited) Flamco make Expansion vessels, so yes something to do with the expansion vessel. the red capped valve is a pressure relief valve, so yes It needs connecting to a tundish, but in case it blows!! Edited May 21, 2017 by Triassic Link to comment Share on other sites More sharing options...
PeterW Posted May 21, 2017 Share Posted May 21, 2017 Bottom set seems to have two fill loops - possibly one for fill and then the other to vent into a bucket as it's glycol based liquid. PReV has to go to a tundish but can't go to ground - don't you have a septic tank as that may be a problem ... Last pair of bits look like a Flamco NRV - has it got anything stamped on it ..? Goes after the PRV set on some of their stuff but it's not to go between the valve and the EV as otherwise you will create negative pressure when it cools ..! Link to comment Share on other sites More sharing options...
Nickfromwales Posted May 21, 2017 Share Posted May 21, 2017 Can we have a pic from behind ? Link to comment Share on other sites More sharing options...
Barney12 Posted May 22, 2017 Author Share Posted May 22, 2017 9 hours ago, Nickfromwales said: Can we have a pic from behind ? Here goes. Looking at the valve thingy more closely I think its definitely designed to be connected as there is a rubber ring seal. When screwed together the two sprung center pieces (black in the photo) appear to push against each other which is making me scratch my head as surely that stops water flowing in either direction??? Link to comment Share on other sites More sharing options...
PeterW Posted May 22, 2017 Share Posted May 22, 2017 7 minutes ago, Barney12 said: When screwed together the two sprung center pieces (black in the photo) appear to push against each other which is making me scratch my head as surely that stops water flowing in either direction??? screw them together and blow through it from either end.... Link to comment Share on other sites More sharing options...
Barney12 Posted May 22, 2017 Author Share Posted May 22, 2017 28 minutes ago, PeterW said: screw them together and blow through it from either end.... Ah good idea! I'll report back! Link to comment Share on other sites More sharing options...
PeterW Posted May 22, 2017 Share Posted May 22, 2017 you may find its a flow stop valve. When you remove one part it works like a hose pipe stop valve and means you can service bits but not seen one like that for a while ! Link to comment Share on other sites More sharing options...
Barney12 Posted May 22, 2017 Author Share Posted May 22, 2017 Here's what the full setup should look like. You'll see that the outlet by the PRV is connected to nout! You will notice the condensation drain at the bottom of the exchanger.The manual makes no mention of that either! Its some sort of 8-10mm chrome pipe. Link to comment Share on other sites More sharing options...
Barney12 Posted May 22, 2017 Author Share Posted May 22, 2017 1 minute ago, PeterW said: you may find its a flow stop valve. When you remove one part it works like a hose pipe stop valve and means you can service bits but not seen one like that for a while ! Actually that makes perfect sense! It would enable you to change the expansion vessel without draining the system and as the system is glycol filled that would be expensive!! Link to comment Share on other sites More sharing options...
PeterW Posted May 22, 2017 Share Posted May 22, 2017 Quick-Action Stop Valve.... Link to comment Share on other sites More sharing options...
Barney12 Posted May 22, 2017 Author Share Posted May 22, 2017 4 minutes ago, PeterW said: Quick-Action Stop Valve.... Awesome! Thanks Peter. Link to comment Share on other sites More sharing options...
Barney12 Posted May 22, 2017 Author Share Posted May 22, 2017 Now it makes sense: Link to comment Share on other sites More sharing options...
Nickfromwales Posted May 22, 2017 Share Posted May 22, 2017 3 hours ago, PeterW said: you may find its a flow stop valve. When you remove one part it works like a hose pipe stop valve and means you can service bits but not seen one like that for a while ! Top man. I forgot that a lot of the automatic air vents I fit come with those so you can change / service them without draining down the whole system. I'd recommend them on the aav's for this system too ? I think the drain off ( tap with yellow lever valve ) under the temp gauge is for draining / sampling the water, and the other is for filling / injecting new product ( glycol ) as I believe there will be a non return after the second drain off. Try blowing through it both ways ( with your hand over the spout that comes out at 45 degrees ). Link to comment Share on other sites More sharing options...
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