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Old Sunland drainback system control
Does anyone happen to know who manufactured the differential control that was installed with the old Sunland drainback system installed in the early 1980's. The control model is a W-990 and says's "Differential Temperature Control". Also any idea as to weather it used 3K or 10K sensors.
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Comments
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Quick Google Search
I googled W990 Solar Control and came up with a website that said it was made by Webb.
http://www.conifer-solar-consulting.com/Webb-990.pdf
Attached is a PDF. Page 8 shows the ohms resistance of the sensors.
Best,
Paul0 -
looks a bit like
the old Heliotrope. I think those were built in California however?Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0
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