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need to fit an automatic bypass valve on an s plan 2 valve system as one was never fitted also pump overrun was not working as who installed this never put a separate feed mains to boiler and separate live demand from the wiring centre ,pump overrun now works but bypass needs fitting asap.
all I want to know is there a minimum length of pipe work required valve will be fitted near to pump outlet and back to return on boiler which is a Worcester bosch r1 18 heat only thanks baz
 
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Not really but this may help there is a few video s on youtube .cheers kop

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I try and make myself clearer as a guess the pipe length in total of the abv circuit will be about 1.5 metres I'm just need to know is that enough for the bypass circuit to recirculate the boiler when its in pump overrun to cool off heat baz
 
It will do its job of giving the boiler/pump some flow rate when the valves are off. It's better fitted away from the boiler to remove heat and allowing it to condense correctly.
 
need to fit an automatic bypass valve on an s plan 2 valve system as one was never fitted also pump overrun was not working as who installed this never put a separate feed mains to boiler and separate live demand from the wiring centre ,pump overrun now works but bypass needs fitting asap.
all I want to know is there a minimum length of pipe work required valve will be fitted near to pump outlet and back to return on boiler which is a Worcester bosch r1 18 heat only thanks baz
Are you Gas Safe Registered mate?
 
Hello All,

Some Boilers require a Bypass measuring a minimum of 6 metres - measured from the Flow connection to the Return connection of the Boiler.

Boiler Bypass pipework is not just to give the Pump somewhere to over-run when the Zone valves close - it is to actually dissipate the Heat from the Boiler Heat Exchanger and prevent the Boiler `High Limit` Thermostat from locking out the Boiler operation.

I cannot emphasise enough that the Manufacturers Installation Instructions should be adhered to regarding the measured length of a Bypass.

Otherwise you may well experience the nuisance of `Boiler Lockout` that would occur if the Bypass is not long enough to dissipate the Heat from the Boiler Heat Exchanger during the Pump over-runs.

Regards,

Chris
 
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Hello All,

Some Boilers require a Bypass measuring a minimum of 6 metres - measured from the Flow connection to the Return connection of the Boiler.

Boiler Bypass pipework is not just to give the Pump somewhere to over-run when the Zone valves close - it is to actually dissipate the Heat from the Boiler Heat Exchanger and prevent the Boiler `High Limit` Thermostat from locking out the Boiler operation.

I cannot emphasise enough that the Manufacturers Installation Instructions should be adhered to regarding the measured length of a Bypass.

Otherwise you may well experience the nuisance of `Boiler Lockout` that would occur if the Bypass is not long enough to dissipate the Heat from the Boiler Heat Exchanger during the Pump over-runs.

Regards,

Chris
thanks for all your reply's been in touch with Worcester bosch tec and explained the situation and they say a minimum of 1 metre but when this is done it will but about 2 metres , I've worked on high pressure cooling systems and control systems for broadcast transmitters I'm not touching the boiler just the water side thanks baz
 
thanks for all your reply's been in touch with Worcester bosch tec and explained the situation and they say a minimum of 1 metre but when this is done it will but about 2 metres , I've worked on high pressure cooling systems and control systems for broadcast transmitters I'm not touching the boiler just the water side thanks baz
How did you sort the wiring live issue out without taking the case off the boiler?
 
How did you sort the wiring live issue out without taking the case off the boiler?
yes I took the case off to rectify this I'm not breaking any rules as this is my boiler indeed some gas safe engineer's wont even touch wiring I'm totally confident in doing this I'm no here to argue about rules some people get mixed up with law and rules . sure I'm going too find a gas safe registered engineer to service and check the boiler this seems hard to find baz
 
hi did fit automatic bypass valve and the boiler is now running the pump overrun correctly now and not getting any thermal shock noises from boiler when it used too shut down,
because I had to disable the pump over run its a terrier Yorkshire a. b. v . seems to like about 3.5 mb setting . can anyone help in a simple way to set up sorry if I upset anybody about taking the boiler case off to rectify the wiring I did pass corgi gas safety Couse when I worked on high power transmitters quite a few years ago .
 
What's your reg number (gas) / what courses did you do
 
What's your reg number (gas) / what courses did you do
this as over 25 years ago we used to have too look after remote sites that had basic heaters and now which is banned helium based fire control on high power transmitter devices gas these used to be in large telecom switch sites but are no longer used also the old anolog high power transmitters had a large array of cooling systems which was mostly water baste for cooling I've come for basic advice not be questioned about weather I can look or alter the water based pipe work for my own boiler I paid a gas safe registered to install this and he didn't realise it needed a abv or that he had incorrectly wired up the boiler who was very reluctant to come back I don't claim to be gas safe .
 
certain cases on boilers form a seal around the combustion chamber, if you remove it the combustion may be effected which could potentially cause major issues.

I understand you may think you’re doing nothing wrong by taking the case off but theres a reason competent engineers are required when working on boilers and for that reason you won’t get any help from people here and it’s not because they don’t want to help you.
 
certain cases on boilers form a seal around the combustion chamber, if you remove it the combustion may be effected which could potentially cause major issues.

I understand you may think you’re doing nothing wrong by taking the case off but theres a reason competent engineers are required when working on boilers and for that reason you won’t get any help from people here and it’s not because they don’t want to help you.
 
hi and thanks for your reply's I'm away from home at the moment,
since the replacement by the chap who wired it up incorrectly I had the boiler checked again by a gas safe engineer , who reset the gas ratios and said the boiler was fined after carrying out checks etc. and agreed it needed a automatic bypass valve and the boiler pump over run needed to be reinstated when this was fitted and rather than me taken the boiler case off to this a link was put in the wring centre to perm live and demand live to disable the pump over run , I recently drained down the system and fitted a automatic bypass valve after the pump but before the 2 zone valves and goes back to the return to the boiler and I also removed the link and the pump over run is now working fine the abv is set to about 0.3.5 bar and no more bangs from the boiler , I get back when I can remember the pump I think it was a grundfus 15/50 but had had a new interpart head insert thanks again
 
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