The SAS can also be used as a Return Air sensor on the HK2000 Economy Control System and the UZC4 Zone Control system
When being used to monitor return air, EWC recommends mounting the RAS in the return plenum, downstream from the bypass damper between the bypass and the air handler
This is done to ensure the air being sensed is a proper mix of bypassed air and return air
The “SAS” box is constructed of UV stabilized poly carbonate plastic with a seamless aluminum tube & plate assembly
The vastly improved thermistor is vacuum potted into a separate stainless steel sleeve, which is then inserted into the tube, creating the temperature probe assembly
Vacuum potting prevents moisture from penetrating and affecting the thermistor
The unique construction provides a thermal barrier between the temperature probe and the duct work allowing precise air temperature measurements