The Discharge Transducer has a range of 0 to 650 PSIG, with a linear output of 0 to 5 DC volts. Table
Suction Pressure Transducer
The optional suction pressure transducer is located in the common suction line of the tandem compressors for each refrigerant circuit. The purpose of the transducer is to sense and convert the suction pressure to a DC voltage. The DC voltage is then sent to the Unit Controller where it is displayed by the User Interface. When this option is installed the Unit Controller will also calculate and display the Evaporator Superheat value for the system.
The Suction Transducer has a range of 0 to 400 PSIG, with a linear output of 0 to 5 volts DC. Table
TABLE 8-5 – PRESSURE TRANSDUCERS
SUCTION TRANSDUCER | DISCHARGE TRANSDUCER | ||
|
|
|
|
PRESSURE | VOLTAGE | PRESSURE | VOLTAGE |
PSIG | VDC | PSIG | VDC |
0 | 0.5 | 0 | 0.5 |
|
|
|
|
25 | 0.75 | 32.5 | 0.7 |
|
|
|
|
50 | 1 | 65 | 0.9 |
|
|
|
|
75 | 1.25 | 97.5 | 1.1 |
|
|
|
|
100 | 1.5 | 130 | 1.3 |
|
|
|
|
125 | 1.75 | 162.5 | 1.5 |
|
|
|
|
150 | 2 | 195 | 1.7 |
|
|
|
|
175 | 2.25 | 227.5 | 1.9 |
|
|
|
|
200 | 2.5 | 260 | 2.1 |
|
|
|
|
225 | 2.75 | 292.5 | 2.3 |
|
|
|
|
250 | 3 | 325 | 2.5 |
|
|
|
|
275 | 3.25 | 357.5 | 2.7 |
|
|
|
|
300 | 3.5 | 390 | 2.9 |
|
|
|
|
325 | 3.75 | 422.5 | 3.1 |
|
|
|
|
350 | 4 | 455 | 3.3 |
|
|
|
|
375 | 4.25 | 487.5 | 3.5 |
|
|
|
|
400 | 4.5 | 520 | 3.7 |
|
|
|
|
|
| 552.5 | 3.9 |
|
|
|
|
|
| 585 | 4.1 |
|
|
|
|
|
| 617.5 | 4.3 |
|
|
|
|
|
| 650 | 4.5 |
|
|
|
|
FORM
Humidity Sensors
The humidity sensor outputs a 0 to 5 volts DC in response to the relative humidity sensed. An outdoor air humidity sensor is used whenever the economizer is configured for single or dual enthalpy. Areturn air humidity sensor is used whenever the economizer is configured for dual enthalpy. A humidity sensor is also used to monitor the humidity in the space between the slab and raised floor system used for FlexSys applications. Table
TABLE 8-6 – HUMIDITY SENSOR OUTPUTS
% RELATIVE |
| % RELATIVE |
|
HUMIDITY |
| HUMIDITY |
|
5 | 0.25 | 55 | 2.75 |
|
|
|
|
10 | 0.50 | 60 | 3.00 |
|
|
|
|
15 | 0.75 | 65 | 3.25 |
|
|
|
|
20 | 1.00 | 70 | 3.50 |
|
|
|
|
25 | 1.25 | 75 | 3.75 |
|
|
|
|
30 | 1.50 | 80 | 4.00 |
|
|
|
|
35 | 1.75 | 85 | 4.25 |
|
|
|
|
40 | 2.00 | 90 | 4.50 |
|
|
|
|
45 | 2.25 | 95 | 4.75 |
|
|
|
|
50 | 2.50 | 100 | 5.00 |
8
JOHNSON CONTROLS | 155 |
