Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Old Sunland drainback system control

solradman Member Posts: 57
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. 


This discussion has been closed.