Search the forum,

frost stats?

Discuss frost stats? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Status
Not open for further replies.
B

bob the plumber

daft quaestion but one i would like to know...probably only put one frost stat in.

if a frost stat powers the boiler when it detects a tempreture of 3 degees or so on what then turns the boiler off, or does it just turn itself off when the boiler stat realises it has reached its max?

stupid question but handy to know

thanks
 
Whan temperature rises frost stat will turn boiler off, frost stat works same as room stat, senses air temperature
while the boiler is running it is controlled by it own thermostat the same as it functions normally
 
No, you should use a pipe stat on the return. This will shut the boiler off when a given temp is reached on the return pipe, usually about 25 degrees C
 
GasmanxxxR1 said:
No, you should use a pipe stat on the return. This will shut the boiler off when a given temp is reached on the return pipe, usually about 25 degrees C
Click to expand...

??????????? when your temperature of pipe is below set temp then it will automatically fire up boiler, even in middle of summer ?????????????
 
GasmanxxxR1 is correct, was pulled on an OFTEC inspection and had to fit pipe stat to disable frost stat once return upto abot 25 - 30C.
 
SimonG said:
GasmanxxxR1 is correct, was pulled on an OFTEC inspection and had to fit pipe stat to disable frost stat once return upto abot 25 - 30C.
Click to expand...

so you still using frost stat with the addition of a pipe stat and run electrical supply through pipe stat pipe stat first then to make a circuit to frost stat which in turn will fire boiler if required ???

That does actually make sense
 
Yep, so you need return below 25 - 30C and air temp low enough to kick in frost stat. I was told it's down to the low temperatures of condensing boilers not heating the air enough to kick out the frost stat, all part of energy conservation.
 
im glad you have mentioned a pipe stat cause my way of thinking was, if the frost stat kicks in because the boiler is in a garage at near zero tempreture then what actually turns the frost stat off as it will not detect the increase of heat off maybe a small run of already insulated pipe work.

thanks
 
Another way of looking at it is...once the frost stat has kicked in then its not going to knock off until the air temperature rises again which could be days if last winter is owt to go by, so summat needs to knock the boiler off when the pipework warms up. enter the pipe stat which will break on rise and kill the boiler until the pipework temp drops below the preset at which point the boiler will fire unless the air temp has risen in the mean time and then nowt happens....job done. The local Chapel near me thought they'd had all their oil nicked last winter, turned out htey only had a frost stat and no pipe stat so the boiler just kept going til it emptied the tank and then everything froze up anyway!!
 
Is there a wiring diagram of this somewhere? I understand the principle but can't visualise the brown and blue things ...
 
I always buy Honeywell and the wiring diagram for the two should be included with the frost stat.
 
frost - pipe stats.JPG
If just to protect the boiler AND if it has a bypass, wire it to the boiler switch live.
To put a bit heat around the house wire it to the brown of the heating motorised valve (or the white of a mid pos).

As both stats break on rise, in normal operating conditions although the pipe stat will make, no power is supplied as the frost stat is still at break.
 
i want to know why there is never mention of this in your installation instructions?? they never mention a pipe stat, but i understand now why it would require one :$
 
basicly its a simple circuit, from permenant live to the same terminal that calls for heat normally ,which is through two switches which in this case are the stats
for those that struggle with wiring think of it as a heating circuit where live is the flow and neutral is return and switches are valves
 
Status
Not open for further replies.

Reply to frost stats? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Similar plumbing topics

D
Frost protection valve, detect air or water temp?
Hi, Short version: Do frost protection valves trigger when the water in the pipe gets to threshold, or when the air temp drops? Long version: I'd rather use frost protection + anti-freeze cycle on my mitsubishi ecodan heat pump. The warranty is apparently fine with that combination, and it...
Replies
3
Views
92
ShaunCorbs
ShaunCorbs
C
combi boiler frost protection
Hi I am somewhat confused. My daughter has a combi boiler bought 2-3 years ago and has it timed to come on in morning for an hour and at night for a few hours using "auto"? mode I had been brought up to leave boilers on manual and set the thermostat low at night to prevent pipes from...
Replies
2
Views
314
colin_
C
D
Frost Stat replacement?
My boiler suddenly seems to come on at random times for a few minutes throughout the day and night. It is a Potterton Suprima in garage. I suspect the Honeywell Frost Stat has become faulty, it doesn't currently seem cold enough for the frost stat to kick in. I'm guessing the pipe stat is...
Replies
7
Views
1K
Ben-gee
B
J
Disconnect external frost protection?
Hi all, My boiler was kind of new & installed last year July, I know there's build-in frost protection. Also, there's an old external frost protection (attached photo) that the engineer did not disconnect it when installed the new boiler. I wonder if I need to disconnect/get rid of the old...
Replies
8
Views
1K
Jurgenjay
J
H
Overheat stat on Grant boiler
Following on from my question about monitoring F & R temperatures, I needed a measuring device because the overheat stat. frequently trips and then needs to be reset. It normally happens when the boiler has switched off and is no doubt due to the hot water rising to the top of the boiler, but I...
Replies
11
Views
1K
gpbeck
gpbeck
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock