Mid Position Valve

[Deryck Tintagel]

Following on from previous post where I am still getting HW when only CH is selected I was looking at the mid-position valve voltages and concluded the voltages in CH and HW were as expected so I have now got around to having a look at the power head and valve.

Firstly, I noticed the scorching on the power head lid. Is this normal? The synchron motor is quite hot to the touch

I then checked the movement of the valve. I understand that the spindle doesn't move far so does this look about right?

The feed comes in from behind the valve, with HW outlet to the top and CH to the bottom. I need to figure out which way the spindle needs to be rotated to get just CH

 

[bernardgreen]

This might help you

http://mr-r.co.uk/3portvalve.html

It can happen that when the actuator tries to move the ball away from a port in order to allow flow into that port water pressure holds the ball against the port and the actuator does not have enough torque to overcome the water pressure.

 

[Hugh Jaleak]

The Honeywell Valves do get ridiculously hot, some say there is an inherent design fault, with the lack of louvres or vents in the casing to allow heat to escape. Competitors products do seem to have a ventilated casing for this very reason. Advice is to drill holes in the casing to allow heat to escape/air to circulate, but if you do, ensure these are small enough to prevent small fingers touching any live parts internally.

 

[Deryck Tintagel]

Thanks Bernard, just the information I was looking for. I feel a bit of tinkering at the weekend may be in order! I don't fancy draining the system at the moment so I would like to check if there is a problem with the valve body or the power head before I go too far.