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Old Sunland drainback system control
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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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