correct wiring connections for a glowworm regular boiler

mark lycett · 14 Oct 2020

Hi , got a glowworm 3 25r boiler on a S plan system, Im confused what wires go where. The programmer is a Honey well ST699. It asks in the boiler manual for a common electric supply for the boiler and for the corresponding controller. There are two mains wiring connection points in the boiler. The first is just Live Neutral and earth, the second has an additional connection called RT. Can anyone shed light on where these two sets of wires terminate. Thanks for any response.

CBW · 14 Oct 2020

Hi Mark,

I think the case forms part of the combustion circuit on the boiler, are you gas safe registered?

mark lycett · 14 Oct 2020

No Chris, im a sparky working with a gas safe engineer.

CBW · 14 Oct 2020

mark lycett said:
No Chris, im a sparky working with a gas safe engineer.

Well I’d have thought your gas engineer would know, RT is room thermostat

mark lycett · 14 Oct 2020

Me too but there you have it., guess he hasn't come across this configuration before. But i guess from your reply you are going to explain it to me , unless you dont know either LOL

CBW · 14 Oct 2020

mark lycett said:
Me too but there you have it., guess he hasn't come across this configuration before. But i guess from your reply you are going to explain it to me , unless you dont know either LOL

I just have explained it - RT = Room thermostat, lol.

picasso · 14 Oct 2020

The orange wires from zone valves are the switched lives , these have to be connected to rt.

mark lycett · 14 Oct 2020

LOL, you just told me sommat I already knew, what i would like to know is how it connects into the s plan wiring system. Normally the room stat would be connected to the zone valve. cheers

CBW · 14 Oct 2020

I’m lost

mark lycett · 14 Oct 2020

Hi Picasso, not come across that before , so do the orange switch lives and the Rt connection connect into terminal 10 . . Cheers

picasso · 14 Oct 2020

No the orange wires connected to rt are the run signal for the boiler (normally 230vac) the live ,neutral and earth for the boiler are taken from the permanent L,N and E in the junction box.

mark lycett · 14 Oct 2020

Thats great Picasso. LOL, you have saved me from a restless night. Would have been handy if they had said that in the manual. Big thanks.

CBW · 14 Oct 2020

mark lycett said:
Thats great Picasso. LOL, you have saved me from a restless night. Would have been handy if they had said that in the manual. Big thanks.

Sorry, didn’t know that’s what you were after, assumed coz you’re a spark, you’d know. Assumption is the mother of all **** ups.

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correct wiring connections for a glowworm regular boiler

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