Hi All
I'm updating the heating system on our boat. Currently we have a central heating circuit running from a back boiler in a solid fuel fire. I'm updating this system by replacing our small 5KW output stove to one which has better output, but more importantly also has a back boiler mounted inside the fire under the stove top. This will extract a lot more heat for the central heating.
My problem. I am using a PWM variable controller to manage the speed of the 24 volt circulating pump. The first PWM lasted 2 winters then started 'hunting' and then failed. I replaced the unit with a more expensive unit but this too 'hunts' on occasion. Next winter the system will be carrying much more heat than now and I want to avoid PWM problems by finding something more robust.
The current PWM I'm using is listed on Ebay UK under search number 323585726803. I had thought of some sort of 'stepped' speed adjuster rather than the variable turn dial. Main thing is that I want to change what I have for something I can have more faith in.
Does anyone have a suggestion for a switching method that will achieve this. The pump doesn't need to run at high speed, Just enough speed to move the water round the system without the pump waking us up! The pump is directly under our bed.....
Many thanks in advance. Stu
PS, The circulating pump uses very little current
I'm updating the heating system on our boat. Currently we have a central heating circuit running from a back boiler in a solid fuel fire. I'm updating this system by replacing our small 5KW output stove to one which has better output, but more importantly also has a back boiler mounted inside the fire under the stove top. This will extract a lot more heat for the central heating.
My problem. I am using a PWM variable controller to manage the speed of the 24 volt circulating pump. The first PWM lasted 2 winters then started 'hunting' and then failed. I replaced the unit with a more expensive unit but this too 'hunts' on occasion. Next winter the system will be carrying much more heat than now and I want to avoid PWM problems by finding something more robust.
The current PWM I'm using is listed on Ebay UK under search number 323585726803. I had thought of some sort of 'stepped' speed adjuster rather than the variable turn dial. Main thing is that I want to change what I have for something I can have more faith in.
Does anyone have a suggestion for a switching method that will achieve this. The pump doesn't need to run at high speed, Just enough speed to move the water round the system without the pump waking us up! The pump is directly under our bed.....
Many thanks in advance. Stu
PS, The circulating pump uses very little current