View Full Version : Older Carrier VVT SAT sensor ohms?
09-19-2011, 01:48 PM
I am replacing some zone controls on an older Carrier VVT system, and I am trying to check the SAT sensor type for reuse on the new stuff. This is the little gray cable with thermistor that sticks in the hole of the (cheap) damper.
I pulled one off to test. I have a 10k type 3 that is reading right at 10000 ohms, 77 degrees. The carrier sensor next to it is reading 8100 ohms. ???
Anyone know something about these sensors?
09-19-2011, 08:44 PM
This is a copy / paste from a Carrier 33CS manual I have. None of what I have lists any values for checking the sensor out. It is all I have to use to check out the few VVT systems I work on.
DUCT TEMPERATURE SENSOR OUT OF RANGE—An
HF05 error is issued when the duct temperature sensor is
open or shorted. The HF05 error will automatically clear when
the sensor reading is back within the allowable range. The
duct temperature sensor can be recalibrated.
To check the duct temperature sensor:
1. Check that the duct temperature sensor wiring and connections
to the damper actuator circuit board are physically
intact. Ensure the 5-conductor control wiring running
between the damper actuator and the zone controller
is not run near AC, control, or communication bus wiring.
Maintain a minimum separation of 12 in. or more
between other wiring and remote room sensor wiring.
2. Check the duct temperature sensor calibration. Calibrate
the sensor by manual calibration at the bypass controller
using the Duct Temperature Sensor Calibration function
(category 5, option 4) and an accurate thermometer. Measure
the temperature at the duct temperature sensor location
using the accurate thermometer.Wait for the reading
to stabilize. Using the set point buttons, increase or
decrease the temperature display to match the reading of
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