Carrier 17/19EX Especificações descarregar pdf (Página 262)

100

101

Troubleshooting Transducers

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 × (

out /

in)) -47.33

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

in = power supply output, i.e., U3 to U4

Transducer Replacement

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.

Make sure to use a backup wrench on the Schrader fitting whenever removing a

transducer.

WARNING

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