Service manual

4-11
4.1.14 Temperature sensor
(1) Sensor calibration
● Supply and Return air sensor
(SS/RS/DSS/DRS)
q Prepare the ice bath
w Cut the binding of each sensor and put them
into the ice bath
e Turn on the unit and display "Sensor
calibration (CAL)" in "Manual Check" mode in
3.9.2.5
r Press the key to calibrate 4 sensors
*Be sure to check the ice bath temperature is
0 degC.
t Controller LED segments display the result of
calibration
<Display>
1
st
: Supply air sensor (SS)
2
nd
: Return air sensor (RS)
3
rd
: Data recorder sensor for Supply air
(DSS)
4
th
: Data recorder sensor for Return air
(DRS)
<Result>
□ : Sensor accuracy is normal; The reading
of the sensor is within 1.0deg C.
Offset figure is memorized in order to
record accurate control/recording.
─ : Sensor accuracy is out of +/-1.0deg C.
The sensor shall be malfunction.
(Replacement is required.)
(Example)
· SS : Normal
· RS : Normal
· DSS : Abnormal
· DRS : Abnormal