Lennox EL23XCV Series Manual page 55

Verifying Liquid Pressure Transducer Operation
Using a multimeter set to VDC with the Liquid Pressure Transducer connected to the "Liq 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 liquid~ pressure measured.
See Table 11.
Liquid Pressure
(PSIG)
VDC
FIGURE 27. Liquid Pressure Transducer Voltage
TABLE 11. Liquid Pressure Transducer Output Voltage
DC Voltage Output
(Pin 2 to Pin 3)
0 0.50
10 0.58
20 0.66
30 0.74
40 0.82
50 0.90
60 0.98
70 1.06
80 1.14
90 1.22
100 1.30
110 1.38
120 1.46
130 1.54
140 1.62
150 1.70
160 1.78
170 1.86
180 1.94
190 2.02
200 2.10
210 2.18
220 2.26
230 2.34
240 2.42
250 2.50
Liquid Pressure
(PSIG)
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
460
470
480
490
500
Page 55
DC Voltage Output
(Pin 2 to Pin 3)
2.58
2.66
2.74
2.82
2.90
2.98
3.06
3.14
3.22
3.30
3.38
3.46
3.54
3.62
3.70
3.78
3.86
3.94
4.02
4.10
4.18
4.26
4.34
4.42
4.50