Verifying Suction Pressure Transducer Operation - Lennox EL23XCV Series Manual

Verifying Suction Pressure Transducer Operation

Using a multimeter set to VDC with the Suction Pressure Transducer connected to the "Suct P" 3-pin connector on the
control board. Pin 1 (Red wire +5VDC) to Pin 3 (Black wire - GND) should read 5 VDC continuous. Pin 2 (Blue wire output
from transducer) to Pin 3 (Black - GND) should read 0.5 to 4.5 VDC and will vary depending on suction pressure mea-
sured. See Table 10.
Suction Pressure
(PSIG)
0
10
20
30
40
50
60
70
80
90
100
VDC
FIGURE 26. Suction Pressure Transducer Voltage
TABLE 10. Suction Pressure Transducer Output Voltage
DC Voltage Output
(Pin 2 to Pin 3)
0.49
0.69
0.89
1.09
1.29
1.49
1.69
1.89
2.09
2.29
2.49
Suction Pressure
(PSIG)
110
120
130
140
150
160
170
180
190
200
210
Page 54
DC Voltage Output
(Pin 2 to Pin 3)
2.69
2.89
3.09
3.29
3.49
3.69
3.89
4.09
4.29
4.49
4.50