HAPAI Forums
Who's Online Now
0 registered members (), 0 guests, and 0 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums30
Topics351
Posts2,202
Members722
Most Online36
Mar 28th, 2017
January
S M T W T F S
1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31
EPH Controls
EPH Controls
GRANT IRL
Grant Engineering
PJ Mac Daid
VOKERA
Grunfos
Grunfos
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 4 1 2 3 4
#2281 - 18/03/18 07:59 PM Cylinder coil pressure  
Joined: Mar 2018
Posts: 15
Graham Offline
Member
Graham  Offline
Member

Joined: Mar 2018
Posts: 15
Hi I was wondering could anyone help?

I have a problem with my oil fired central heating. To try and narrow the leak down my plumber has installed gate valves to the various zones - bedrooms and living room and hot water.
When gate valves are isolated (in closed position) on the hot water cylinders flow and return my Grunfos pump pumping hot and cold water around the house is able to drive the coil pressure down to "0" on the pressure guage also installed on the hot water coil. This stays at zero for about a day and then rises back up to 1.5 bar!! This is so confusing and to me doesn't make any scense! This coil has been hydraulically tested at 4 bar for 2 hours with absolutely no drop in pressure. The water was stone cold at testing. When the water is roasting could a leak be happening due to expansion in coil??

Grant Engineering - Think Grant Think Boilers
Grant Engineering
#2282 - 18/03/18 09:24 PM Re: Cylinder coil pressure [Re: Graham]  
Joined: Feb 2017
Posts: 334
Richie Burke Offline
Admin
Richie Burke  Offline
Admin
Member
*****

Joined: Feb 2017
Posts: 334
Cork
Hi Graham
Is the cylinder pressurised the domestic part that is

#2283 - 18/03/18 11:21 PM Re: Cylinder coil pressure [Re: Richie Burke]  
Joined: Mar 2018
Posts: 15
Graham Offline
Member
Graham  Offline
Member

Joined: Mar 2018
Posts: 15
Hi Richie,

Yes, currently the guage on the cylinder is reading 1.25 bar. The make of cylinder is a "Joule" CY300L Triple (300 litre cylinder) I was reading down through the manual for this cylinder and it was saying that I should have the expansion vessel charged up to 2.7bar? Would this be the reason why my heating system keeps dropping to 0 bar over time - not immediately?? I think there is only 1.5 bar in the expansion vessel at present!

#2284 - 18/03/18 11:53 PM Re: Cylinder coil pressure [Re: Graham]  
Joined: Feb 2017
Posts: 646
Shane Henderson Offline
Admin
Shane Henderson  Offline
Admin
Member
*****

Joined: Feb 2017
Posts: 646
Kilkenny
Gate valves might not be the bet type of valves to pressure test with as they may not be water tight. Best practice would be use a lever valve to isolate pipework.

#2285 - 19/03/18 12:02 AM Re: Cylinder coil pressure [Re: Shane Henderson]  
Joined: Mar 2018
Posts: 15
Graham Offline
Member
Graham  Offline
Member

Joined: Mar 2018
Posts: 15
Hi,
I'm not a plumber but what is the difference in appearance? Maybe I'm using the wrong terminology. These valves have red handles on them.

#2286 - 19/03/18 12:07 AM Re: Cylinder coil pressure [Re: Graham]  
Joined: Mar 2018
Posts: 15
Graham Offline
Member
Graham  Offline
Member

Joined: Mar 2018
Posts: 15
Hi again,

Sorry I forgot to say that this system worked perfectly for 10 months without a bother, held pressure at 1.5 bar all day long no up until lately and now all this!

#2287 - 19/03/18 12:10 AM Re: Cylinder coil pressure [Re: Graham]  
Joined: May 2017
Posts: 3
Donnacha Lambert Offline
Member
Donnacha Lambert  Offline
Member

Joined: May 2017
Posts: 3
Was pressure gauge 0 to start with? If so the temperature fluctuations of the cylinder will cause the guage to increase and decrease in pressure due to the water in the coil getting hot and cold.

Last edited by Donnacha Lambert; 19/03/18 12:13 AM.
#2288 - 19/03/18 12:10 AM Re: Cylinder coil pressure [Re: Graham]  
Joined: Apr 2017
Posts: 10
Damien Hayes Offline
Member
Damien Hayes  Offline
Member

Joined: Apr 2017
Posts: 10
Kildare
I agree with shane. Gate valve not reliable. Albeit I would be surprised if heat would affect a leak given it was tested at 4bar. Then again you would need to do the test with the pump off and a tap open. So if its leaking at time of test it has somewhere to leak to.

#2289 - 19/03/18 12:13 AM Re: Cylinder coil pressure [Re: Graham]  
Joined: Apr 2017
Posts: 10
Damien Hayes Offline
Member
Damien Hayes  Offline
Member

Joined: Apr 2017
Posts: 10
Kildare
Red hadles would be a lever valve if its a red wheel its generally a gate valve

#2290 - 19/03/18 12:16 AM Re: Cylinder coil pressure [Re: Graham]  
Joined: Feb 2017
Posts: 646
Shane Henderson Offline
Admin
Shane Henderson  Offline
Admin
Member
*****

Joined: Feb 2017
Posts: 646
Kilkenny
Originally Posted by Graham
Hi,
I'm not a plumber but what is the difference in appearance? Maybe I'm using the wrong terminology. These valves have red handles on them.

A gate valve will have a round red handle. A lever valve will have a long straight handle.

Page 1 of 4 1 2 3 4

Popular Topics(Views)
NRG Awareness
NRG Awareness
Vokera by Riello
VOKERA
© Heating & Plumbing Association of Ireland . All rights reserved. :: Terms of Use :: Forum Software by Istech Web Design