Carrier 17/19EX Manual De Usuario

When troubleshooting transducers, keep the negative lead of your voltohmmeter on terminal 

U4 of the power supply (or terminal 4 on power supplies without the comparator circuit).

voltage VO1 = (VH1-VL1) + .467 ± .1 V

For all PIC transducers: 

Measured pressure = (507.97 × (

V

out /

V

in)) -47.33 

V

out  = transducer output ref. to neg. terminal (4 or U4) i.e., VH1 to U4 or VL1 to U4 

V

in 

= power supply output, i.e., U3 to U4

Since the transducers are mounted on Schrader-type fittings, there is no need to remove 

refrigerant from the vessel. Disconnect the transducer wiring by pulling up on the locking tab 

while pulling up on the weather-tight connecting plug from the end of the transducer. 

Do not pull 

on the transducer wires. Unscrew the transducer from the Schrader fitting. When installing a 

new transducer, do not use pipe sealer, which can plug the sensor. Put the plug connector back 

on the sensor and snap into place. Check for refrigerant leaks.