Curioser and curioser. Lots of calls today about valves, including with Martin Hook from Southwest heat pumps who's the franchise holder and knows these units inside out.
Turns out the VRG141 unit is the one the designer intended. Although the Sanyo datasheet specifies the VRB141, and the valve manufacturer's application note shows the VRB141 in that application, Martin prefers the VRG141 unit in this application. Part of it is because we aren't using the Sanyo tank, but a home brewed one that gives us a higher Coefficient of Performance (COP), and part of it is because of the way the valve works.
This being Devon, I wonder if the fact it's cheaper too has anything to do with it?
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