Re: Ranco H 16

Posted by d c On 2015/2/26 8:13:56

Thanks. I did not realize there was a service counceler relating to this. I will have to make a habit of searching these even for earlier model years. Perhaps it was Packards intent to eliminate the automatic function for a manual system. As I recall the capillary tube and bulb tip work in conjunction to sense the difference between the ambient and delivered air. The plunger tip has very little movement at temp differentials of 30 deg to 90 deg(less then a 1/16).It will have a quarter inch or so if the bulb is in 150 and the coil tube is at 75-80. Seems unlikely the unit could have any automatic function installed in this application.
The bulb in the plenum chamber also will allow the unit to compensate for extreme differences in the outside air temp and the htr cores ability to heat air of 20 deg as opposed to 55 deg.