Frost stat and pipe stat boiler inside garage

[Inverness]

New built home. Has a combi on a 2 heating zones. The issue boiler located inside garage has a frost stat and a status ct100 pipe stat. The boiler is running through the night and the radiator on the 2nd zone that room is roasting hot.
Any suggestions? The pipe stat is on 40 degrees can this pipe stat go below 40 degrees? Any suggestions

 

[Basher]

The frost stat and pipe stat should be wired in series, and shouldn't be operating the boiler at all unless the frost stat has clicked in around 5 degrees. Then the pipe stat should turn it off again when the pipe temp has got up to 40.
What makes you think the fault lies with the frost protection? Could it be a room thermostat or motorised valve problem?

And re the Salus ct100, I think the dial markings below 40 do allow you to turn it to say 30deg if you want to, but I don't think that's related to the problem you describe.

 

[Inverness]

Its a brand new house Barratts homes.
I think the design is suppose to do this but the customers are not wanting the boiler running over the colder nights for longer than it needs to hense high energy costs.
Is there anything I can do so if the frost stat does kick in it's only on until it reaches 15 degrees instead of 40 degrees?? Thank you

 

[Inverness]

I think the pipe stat is wired in away when it detects the colder temperature it opens up the zone valve and closes when it drops. This is my understanding.

 

[Basher]

Its a brand new house Barratts homes.
I think the design is suppose to do this but the customers are not wanting the boiler running over the colder nights for longer than it needs to hense high energy costs.
Is there anything I can do so if the frost stat does kick in it's only on until it reaches 15 degrees instead of 40 degrees?? Thank you

OK, I misunderstood, if it's just that it needs to go off at a lower temp, you could try turning the Salus one down to min if you dare!
The pipe stats I've seen, seem to mostly have a min temp. of 20deg. Screwfix do a Drayton one that goes down to 20.

Are you sure the pipe stat is wired correctly and doing its job? I wouldn't expect a room to be 'roasting hot' just through frost protection!

 

[Basher]

I think the pipe stat is wired in away when it detects the colder temperature it opens up the zone valve and closes when it drops. This is my understanding.

That sounds right in that there needs to be some circulation in the system.

 

[Inverness]

Thanks..
The salus ct100 only has 40-65 but before 40 there is dots which I'm assuming could go as low as 15 degrees but anyone know? I've checked the manual and nothing..

 

[Basher]

Thanks..
The salus ct100 only has 40-65 but before 40 there is dots which I'm assuming could go as low as 15 degrees but anyone know? I've checked the manual and nothing..

The number and size of dots imply it might go down to 20. I believe it is a mechanical bi-metallic mechanism, so you might be able to hear it click on and off, in which case a bit of experimenting off the pipe might indicate its temp. range.

 

[exedon2]

We do a few of these we always use honeywell frost stat and L641B low limit pipe stat.
Honeywell instructions say set pipe stat at 25c.