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
Summary of Contents for SUPRA 950Mt
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