y plan heating (combiboiler)

The apprentice · Sep 17, 2021

hi there thanks in advance for helping was just wondering if anyone had diagrams of y plans which i think are combi boiler wiring diagrams

Deleted account · Sep 17, 2021

Not combi boilers. System boilers.
system boilers do heating and a hot water tank.
y plan for systems with a3 port valve
s plan for system with two 2 port valves.
just google it loads of images pop up.

The apprentice · Sep 17, 2021

had a little look just want to know how the water works is it a flow switch that fires the boiler

Paignton pete said:
Not combi boilers. System boilers.
system boilers do heating and a hot water tank.
y plan for systems with a3 port valve
s plan for system with two 2 port valves.
just google it loads of images pop up.d

Deleted account · Sep 17, 2021

The apprentice said:
had a little look just want to know how the water works is it a flow switch that fires the boiler

No . Its the programmer that controls the firing of the boiler via room stats for rads and water cylinder stat for the stored hot water.

Deleted account · Sep 17, 2021

To add to the above

call for hot water from programer.
signal sent to port valve Via cylinder stat.
If the temp in cylinder is lower than set temp signal is allowed through.
port valve opens to allow water to flow to the cylinder.
port valve sends a signal to pump and switched live in boiler firing it up.

telectrix · Sep 18, 2021

try these for starters.

snowhead · Sep 18, 2021

The apprentice said:
had a little look just want to know how the water works is it a flow switch that fires the boiler

Yes with a Combi Boiler the flow of water through the Hot tap(s) activates a flow switch in the boiler to fire it up for Hot water only.

SparkySy · Sep 18, 2021

Honeywell do a boiler book that used to be free on request from them that has most combinations of boiler systems,programmers and stats in. (Think mine is issue 23) it has been a very handy book over the years and well worth a call to them!
Sy

snowhead · Sep 18, 2021

Pdf of above book,

https://heatingcontrols.honeywellhome.com/documents/All/pdf/Heating-Controls-Wiring-Guide-Issue-18.pdf

SparkySy · Sep 18, 2021

Just found my copy and it's issue 16 not 23
?

[ElectriciansForums.net] y plan heating (combiboiler)

DefyG · Sep 18, 2021

Going 'off piste' slightly from OP's question, I have come across 'Hybrid' systems a while back where combi boilers were used in conjunction with a hot water cylinder.
Don't recall it overly complicated in terms of wiring at the time.

The apprentice · Sep 19, 2021

Thanks a lot guys

johntheo · Sep 20, 2021

DefyG said:
Going 'off piste' slightly from OP's question, I have come across 'Hybrid' systems a while back where combi boilers were used in conjunction with a hot water cylinder.
Don't recall it overly complicated in terms of wiring at the time.

Saw a few posts where people wanted to use their combi with cylinder only (and rads) but the advise was to still leave the combi HW side serving one outlet only like the kitchen tap, don't know if the HW side can be de commissioned completely or not, safely.

y plan heating (combiboiler)

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