15mm Auto Bypass Valve Stem
On 11/11/17 16:59, John Rumm wrote:Thanks John.
> On 11/11/2017 11:44, Tim Watts wrote:
>> I've balancing my new CH - noticed the flow and return to the boiler
>> were virtually the same - and the auto bypass valve was set to minimum
>> (0.1 bar = 1m head water IIRC)
>>
>> Closing it down to 0.4 bar has jumped the differential temperature - but
>> I suspect that's too high.
>>
>> The Worcester manual says the pump can deliver 2m head for '21C
>> temperature rise' - nothing else about min flow rates or bypass pressure.
>>
>> Any ideas? If I turn it to 0.2bar the flow temperature starts to creep
>> up.
>>
>> Now this may also suggest I have the lockshields all turned down too low
>> as well (I've opened 1/4 - 3/4 turn as a starting point).
>
>
> I have mine set pretty high - based on the assumption that I only want
> it to do anything when nearly all the TRVs are closed off. A highish
> differential temperature should keep condensing efficiency up as well.
>
After balancing round 1 (a differential thermometer with 2 pipe clamps
certainly makes this quicker!), I have 10-12 across all rads more or
less at a flow to rad of 56C (boiler indicates more like 65C internal).
Fiddling with the bypass, it seems to start shunting big time at a bit
under 0.4bar - so I have set it a smidge over.
The plan is now to turn the boiler down to about 55C flow - I have
oversized the rads as far as possible with a low flow temperature (and
spare in a really cold winter) in mind.
Think I'll have to go around one more time in a couple of weeks.
Next problem - it's bloody hot upstairs and there are no radiators.
But there is about 50-70m of exposed pipework!!!
It's been quite tightly run (linked Talon clips) and I cannot get 13mm
thick insulation on it. So I'm off to peruse the Internet for either
some thinner tube, or I'll have to box it in (and be damned if the flow
heats the return a bit).
Overall - very happy. I have boiled everyone half to death running it
flat out all day. That is very nice - this house has never been this warm :)
Danfoss Avdo 15 Auto Bypass Valve 15mm
15mm Auto Bypass Valve Wrench
Toolstation supplies an extensive variety of valves that connect to numerous types of pipes. Take a look at our pressure relief valves including the auto bypass valve and pressure reducing valve with pressure gauge to regulate sealed heating system pressures. The Auto Bypass valve commonly sits between the flow and return pipework section of your central heating system where it can control the flow put of water whereas Pressure Release Valves (PRV) are used to prevent the build up of excessive pressure within a central heating system. MYSON offer a selection of automatic bypass valves to complement our range of heating valves. Our automatic by-pass valve is designed for use in domestic central heating systems and is available in either an angled or straight version. Its purpose is to maintain constant pump pressure and flow rate within the system.
15mm Auto Bypass Valve Gasket
TRV Pack (white) Suit 10mm-15mm; TRV Pack Inline (white) TRV Pack (chrome) Suit 10mm-15mm; TRV Pack Inline (chrome) ABBV1 Auto Bypass Valve; VAL222MV Zone Valve 22mm; VAL228MV Zone Valve 28mm; VAL322MP Mid-Position Valve 22mm; VAL328MP Mid-Position Valve 28mm; Zone Valve Actuator 22mm/28mm; Mid-Position Valve Actuator; Water Treatment. Buy the Altecnic 15mm Pressure Reducer Valve & Gauge at PlumbNation.co.uk. Take control of your central heating system with our huge range of heating controls and thermostats suitable for any installation or budget. Secure Checkout.
15mm Auto Bypass Valve Stem
On 11/11/17 16:59, John Rumm wrote:Thanks John.
> On 11/11/2017 11:44, Tim Watts wrote:
>> I've balancing my new CH - noticed the flow and return to the boiler
>> were virtually the same - and the auto bypass valve was set to minimum
>> (0.1 bar = 1m head water IIRC)
>>
>> Closing it down to 0.4 bar has jumped the differential temperature - but
>> I suspect that's too high.
>>
>> The Worcester manual says the pump can deliver 2m head for '21C
>> temperature rise' - nothing else about min flow rates or bypass pressure.
>>
>> Any ideas? If I turn it to 0.2bar the flow temperature starts to creep
>> up.
>>
>> Now this may also suggest I have the lockshields all turned down too low
>> as well (I've opened 1/4 - 3/4 turn as a starting point).
>
>
> I have mine set pretty high - based on the assumption that I only want
> it to do anything when nearly all the TRVs are closed off. A highish
> differential temperature should keep condensing efficiency up as well.
>
After balancing round 1 (a differential thermometer with 2 pipe clamps
certainly makes this quicker!), I have 10-12 across all rads more or
less at a flow to rad of 56C (boiler indicates more like 65C internal).
Fiddling with the bypass, it seems to start shunting big time at a bit
under 0.4bar - so I have set it a smidge over.
The plan is now to turn the boiler down to about 55C flow - I have
oversized the rads as far as possible with a low flow temperature (and
spare in a really cold winter) in mind.
Think I'll have to go around one more time in a couple of weeks.
Next problem - it's bloody hot upstairs and there are no radiators.
But there is about 50-70m of exposed pipework!!!
It's been quite tightly run (linked Talon clips) and I cannot get 13mm
thick insulation on it. So I'm off to peruse the Internet for either
some thinner tube, or I'll have to box it in (and be damned if the flow
heats the return a bit).
Overall - very happy. I have boiled everyone half to death running it
flat out all day. That is very nice - this house has never been this warm :)
Danfoss Avdo 15 Auto Bypass Valve 15mm
15mm Auto Bypass Valve Wrench
Toolstation supplies an extensive variety of valves that connect to numerous types of pipes. Take a look at our pressure relief valves including the auto bypass valve and pressure reducing valve with pressure gauge to regulate sealed heating system pressures. The Auto Bypass valve commonly sits between the flow and return pipework section of your central heating system where it can control the flow put of water whereas Pressure Release Valves (PRV) are used to prevent the build up of excessive pressure within a central heating system. MYSON offer a selection of automatic bypass valves to complement our range of heating valves. Our automatic by-pass valve is designed for use in domestic central heating systems and is available in either an angled or straight version. Its purpose is to maintain constant pump pressure and flow rate within the system.
15mm Auto Bypass Valve Gasket
TRV Pack (white) Suit 10mm-15mm; TRV Pack Inline (white) TRV Pack (chrome) Suit 10mm-15mm; TRV Pack Inline (chrome) ABBV1 Auto Bypass Valve; VAL222MV Zone Valve 22mm; VAL228MV Zone Valve 28mm; VAL322MP Mid-Position Valve 22mm; VAL328MP Mid-Position Valve 28mm; Zone Valve Actuator 22mm/28mm; Mid-Position Valve Actuator; Water Treatment. Buy the Altecnic 15mm Pressure Reducer Valve & Gauge at PlumbNation.co.uk. Take control of your central heating system with our huge range of heating controls and thermostats suitable for any installation or budget. Secure Checkout.
