A valve obsessive

Having spent all the previous night obsessing about the VRB141, I spent last night on the VRG141, since that is what I have and the distributor wants to use it. The key is what the Sanyo controller does to the ARA672 actuator.

In the neutral, or central position, the valve paddle is straight up and down, connecting the bottom port of the valve to the top port. The Sanyo controller, working with the actuator, expects a 45 degree clockwise rotation to connect the coldest feed to the top port of the valve, and it expects a 45 degree anticlockwise rotation to connect the hottest feed to the top port.


To achieve that with the VRB141 unit, the hottest feed enters on the left hand side of the valve and the coldest on the right. For the VRG141 unit, the hottest feed enters on the right and the coldest on the left. If you get that wrong, you're system will never work. If you're heating installer is unaware of that, there's a 50-50 chance it will work!

Figuring that out was one way to spend an evening. I can think of others.