4. Sensors
Page 16
506457−01 05/10
4.4. Optional CO
2
(IAQ) Sensor
The indoor CO
2
sensor (A63) is an analog sensor with a 0−10Vdc output over a CO
2
range of 0−2000ppm as shown in the
following table. The sensor is powered with 24Vac.
CO
2
PPM DC Voltage CO
2
PPM DC Voltage CO
2
PPM DC Voltage CO
2
PPM DC Voltage
0 0 600 3.0 1200 6.0 1800 9.0
200 1.0 800 4.0 1400 7.0 2000 10.0
400 2.0 1000 5.0 1600 8.0
4.5. Optional Supply Static Pressure Sensor
The supply duct differential static pressure sensor (A30) is an analog sensor with a 0−10Vdc output over a range of 0−5"w.c
as shown in the following table. The sensor is powered with 24Vac.
Pressure "w.c. DC Voltage Pressure "w.c. DC Voltage Pressure "w.c. DC Voltage Pressure "w.c. DC Voltage
0 0 1.5 3.0 3.0 6.0 4.5 9.0
0.5 1.0 2.0 4.0 3.5 7.0 5.0 10.0
1.0 2.0 2.5 5.0 4.0 8.0
4.6. Optional Building or Return Static Pressure Sensor
The building static differential static pressure sensor (A34) is an analog sensor with a 0−10Vdc output over a range of –0.5 to
0.5"w.c as shown in the following table. The sensor is powered with 24Vac.
Pressure "w.c. DC Voltage Pressure "w.c. DC Voltage Pressure "w.c. DC Voltage Pressure "w.c. DC Voltage
−0.5 0 −0.2 3.0 0.1 6.0 0.4 9.0
−0.4 1.0 −0.1 4.0 0.2 7.0 0.5 10.0
−0.3 2.0 0.0 5.0 0.3 8.0
4.7. Optional Enthalpy Sensor
The optional enthalpy sensors (A7 and A63) used with the economizer have an output of 4−20ma. The sensor is powered
with 24Vac. See figure 13 (Page 29).
4.8. Optional Outdoor Air Control (OAC) Sensor
The optional outdoor air control sensor is an analog sensor with a 0−10Vdc output. Three velocity ranges are available (see
table 8). The sensor is powered with 24Vac.
Table 8. OAC Sensor Velocity Ranges
0−5m/sec 0−7.5 m/sec 0−10 m/sec
Sensor Volts M2 Readout
m/sec. ft/min. m/sec. ft/min. m/sec. ft/min.
0.00 0 0.00 0 0.00 0 0.00 0
0.50 5 0.25 49 0.38 74 0.50 98
1.00 10 0.50 98 0.75 148 1.00 197
1.50 15 0.75 148 1.13 221 1.50 295
2.00 20 1.00 197 1.50 295 2.00 394
2.50 25 1.25 246 1.88 369 2.50 492
3.00 30 1.50 295 2.25 443 3.00 590
3.50 35 1.75 344 2.63 517 3.50 689
4.00 40 2.00 394 3.00 590 4.00 787
4.50 45 2.25 443 3.38 664 4.50 886
5.00 50 2.50 492 3.75 738 5.00 984
5.50 55 2.75 541 4.13 812 5.50 1082
6.00 60 3.00 590 4.50 886 6.00 1181
6.50 65 3.25 640 4.88 959 6.50 1279
7.00 70 3.50 689 5.25 1033 7.00 1378
7.50 75 3.75 738 5.63 1107 7.50 1476
8.00 80 4.00 787 6.00 1181 8.00 1574
8.50 85 4.25 836 6.38 1255 8.50 1673
9.00 90 4.50 886 6.75 1328 9.00 1771
9.50 95 4.75 935 7.13 1402 9.50 1870
10.00 100 5.00 984 7.50 1476 10.00 1968
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