Hi,
I have a newly installed boiler which has built-in frost protection, when the installer installed this boiler, they did not disconnect the old external frost stat which is still wired to the boiler.
I assume no newly installed boiler is still wired with old external frost stat, right? So I intend to disconnect the external frost stat (it might has caused my boiler in garage to fire in a cold day and lasted nearly 4 hours!)
When the external frost stat is in use, I heard "Now the frost stat should be wired in series with a clamp on low temperature pipe stat on the return to the boiler, which SHOULD open the CH zone valve to dump the heat. The return clamp on stat is usually set to about 20°c and when the return water reaches that temperature the stat contacts will open and cut power to the CH valve and in turn the boiler. Without this additional clamp on stat you will get constant cycling at the burner.Remember the idea of this setup is to prevent the boiler from freezing, while using as little fuel as possible."
I understand the above mentioned pipe stat is for external frost stat with boiler in the garage.
But if I disconnect the external frost stat, do I still need to install a pipe stat on the loft pipe?
Or the pipe stat can function itself which does not matter with or without external frost stat?
@John.g @SJB060685
I have a newly installed boiler which has built-in frost protection, when the installer installed this boiler, they did not disconnect the old external frost stat which is still wired to the boiler.
I assume no newly installed boiler is still wired with old external frost stat, right? So I intend to disconnect the external frost stat (it might has caused my boiler in garage to fire in a cold day and lasted nearly 4 hours!)
When the external frost stat is in use, I heard "Now the frost stat should be wired in series with a clamp on low temperature pipe stat on the return to the boiler, which SHOULD open the CH zone valve to dump the heat. The return clamp on stat is usually set to about 20°c and when the return water reaches that temperature the stat contacts will open and cut power to the CH valve and in turn the boiler. Without this additional clamp on stat you will get constant cycling at the burner.Remember the idea of this setup is to prevent the boiler from freezing, while using as little fuel as possible."
I understand the above mentioned pipe stat is for external frost stat with boiler in the garage.
But if I disconnect the external frost stat, do I still need to install a pipe stat on the loft pipe?
Or the pipe stat can function itself which does not matter with or without external frost stat?
@John.g @SJB060685