Hi,
I have a Worcester Bosch Greenstar 18Ri regular boiler installed within my garage.
There is also a Honeywell T4360 Frost Thermostat installed just above and to the left of
the boiler.
The problem I was having was that the Frost Thermostat was kicking in in cold weather
and firing up the boiler for very long periods of time which in turn was heating up the house.
After reading up on the internet, I did find out that if a frost stat is used that a pipestat
should be used in conjunction to turn the boiler off once the pipework temperature is high
enough to prevent the pipes from freezing, which one is not currently fitted.
From reading my boilers user manual it states that there is already an inbuilt
frost protection function within the boiler. So for a quick fix we temporarily disconnected
the power from the frost stat, to prevent over heating as it was becoming a major problem.
So wondered if anyone could confirm the following queries.
1.
Does my boiler actually need an additional frost stat and pipe stat?
As the boiler has its own frost protection function, or should it have both frost/pipe stat and
the boilers inbuilt protection active?
2.
If the frost stat is still wired into the boiler, but does not have power going to the frost stat
itself, will this prevent the boilers inbuilt frost prevention function from activating?
3.
As you can see from the snippet from my boilers user manual this is how the inbuilt frost
protection function works:
If the temperature within the boiler falls below 8°C the pump will run to circulate water and
prevent the system freezing.
If the temperature does not rise to 9°C within 30 minutes of the pump operating, the boiler
will fire up to provide heat to bring the temperature up.
If the temperature within the boiler falls below 5°C the boiler will fire, bringing the boiler
temperature up to 12°C to avoid the possibility of the system freezing.
This process will be repeated until such time that the boiler temperature does not drop below 5°C.
Last night the outside temperature dropped to -1.6C (about 4.0C in the garage) but I did not hear the central heating pump come on, so I am not sure if the boilers inbuilt frost protection
is working or not.
FYI. the heating in the house was off over night, it turned off at 23:00. So there was no heating demand throughout the night.
So I would have expected that the frost function would have activated as the temperature in the garage was less than 9.0C.
Would the temperature within the boiler have stayed above 9.0C all night if the heating was turned off at 23:00? I was up until 2:30 in the morning (in bed), and never heard the pump come on. Only until 5:00am when the timer was set to turn the Central Heating back on.
Also, when the above mentions that 'the pump will run to circulate water' would this be an 'internal pump' within the boiler, or the pump which is located within my airing-cupboard? Just so I know if I should be listening for the one in the airing-cupboard or not.
Any advice would be appreciated.
I have a Worcester Bosch Greenstar 18Ri regular boiler installed within my garage.
There is also a Honeywell T4360 Frost Thermostat installed just above and to the left of
the boiler.
The problem I was having was that the Frost Thermostat was kicking in in cold weather
and firing up the boiler for very long periods of time which in turn was heating up the house.
After reading up on the internet, I did find out that if a frost stat is used that a pipestat
should be used in conjunction to turn the boiler off once the pipework temperature is high
enough to prevent the pipes from freezing, which one is not currently fitted.
From reading my boilers user manual it states that there is already an inbuilt
frost protection function within the boiler. So for a quick fix we temporarily disconnected
the power from the frost stat, to prevent over heating as it was becoming a major problem.
So wondered if anyone could confirm the following queries.
1.
Does my boiler actually need an additional frost stat and pipe stat?
As the boiler has its own frost protection function, or should it have both frost/pipe stat and
the boilers inbuilt protection active?
2.
If the frost stat is still wired into the boiler, but does not have power going to the frost stat
itself, will this prevent the boilers inbuilt frost prevention function from activating?
3.
As you can see from the snippet from my boilers user manual this is how the inbuilt frost
protection function works:
If the temperature within the boiler falls below 8°C the pump will run to circulate water and
prevent the system freezing.
If the temperature does not rise to 9°C within 30 minutes of the pump operating, the boiler
will fire up to provide heat to bring the temperature up.
If the temperature within the boiler falls below 5°C the boiler will fire, bringing the boiler
temperature up to 12°C to avoid the possibility of the system freezing.
This process will be repeated until such time that the boiler temperature does not drop below 5°C.
Last night the outside temperature dropped to -1.6C (about 4.0C in the garage) but I did not hear the central heating pump come on, so I am not sure if the boilers inbuilt frost protection
is working or not.
FYI. the heating in the house was off over night, it turned off at 23:00. So there was no heating demand throughout the night.
So I would have expected that the frost function would have activated as the temperature in the garage was less than 9.0C.
Would the temperature within the boiler have stayed above 9.0C all night if the heating was turned off at 23:00? I was up until 2:30 in the morning (in bed), and never heard the pump come on. Only until 5:00am when the timer was set to turn the Central Heating back on.
Also, when the above mentions that 'the pump will run to circulate water' would this be an 'internal pump' within the boiler, or the pump which is located within my airing-cupboard? Just so I know if I should be listening for the one in the airing-cupboard or not.
Any advice would be appreciated.
