5-21 62-11863
5.17 SUCTION PRESSURE TRANSDUCER
Before a new suction pressure transducer can be installed, it must be calibrated.
The calibration will not be performed if the run relay is energized. This prevents the operator from calibrating the unit
with the sensor in the system. The reading of the sensor must be at atmospheric pressure (0 psig or 14.7 psi). If the
sensor reading is greater than 20 psig (34.7 psi) or less than -6.7 psig (8 psi), it cannot be calibrated.
Once the micro is calibrated, the display will readout the actual value.
a. Turn power off, remove starter solenoid wire, and let unit fail to start. This will de-energize run relay.
b. Connect wiring to new suction pressure transducer. Before installing suction pressure transducer into unit,
display the suction pressure via the unit status display.
c. While the suction pressure is being displayed press the Enter key for three seconds. The display should
read 0. If display reads 0, install suction pressure transducer into unit.
Table 5–4 Sensor Resistance (ATS, CDT, RAS, SAS & WTS)
Temperature
RAS, SAS & WTS
Resistance In Ohms
CDT Resistance
In Ohms
°F °C
−20 -28.9 165,300 1,653,000
-10 -23.3 117,800 1,178,000
0 -17.8 85,500 855,000
10 -12.2 62,400 624,000
20 -6.7 46,300 463,000
30 -1.1 34,500 345,000
32 0 32,700 327,000
40 4.4 26,200 262,000
50 10.0 19,900 199,000
60 15.6 15,300 153,000
70 21.1 11,900 119,000
77 25 10,000 100,000
80 26.7 9,300 93,000
90 32.2 7,300 73,000
100 37.8 5,800 58,000
110 43.3 4,700 47,000
120 48.9 3,800 38,000
194 90 915 9,150
212 100 680 6,800
266 130 301 3,010
302 150 186 1,860
325 163 - 1,358
350 177 - 1,202
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