Quick Test - Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual

To calibrate these transducers:
1. Shut down the compressor, cooler, and condenser pumps.
NOTE: There should be no flow through the heat
exchangers.
2. Disconnect transducer in question from its Schrader fitting
for cooler or condenser transducer calibration. For oil pres-
sure delta P, the optional cooler and condenser liquid delta P,
or flow device calibration, leave the transducer in place.
NOTE: If cooler or condenser vessels are at 0 psig (0 kPa) or
are open to atmospheric pressure, the transducers can be cali-
brated for zero without removing transducer from the vessel.
3. On the Transducer Calibration screen the particular pressure
reading can be adjusted to meet the standard/reference with
up to  5 psi.
If calibration problems are encountered on the Oil Pressure Differ-
ential channel, sometimes swapping the oil pressure leaving filter
and the oil sump pressure transducer locations will offset an ad-
verse transducer tolerance stack up and allow the calibration to
proceed.
TRANSDUCER REPLACEMENT
Since the pressure transducers are mounted on Schrader-type fit-
tings, there is no need to remove refrigerant from the vessel when
replacing the transducers. 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 fit-
ting. 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. Be sure to
properly identify the transducer being replaced since the high
pressure switch DOES NOT have a Schrader valve which if re-
moved with charge in the chiller can result in refrigerant burns and
loss of charge.
Be sure to use a back-up wrench on the Schrader fitting when-
ever removing a transducer, since the Schrader fitting may
back out with the transducer, causing a large leak and possible
injury to personnel.

Quick Test

The Quick Test feature can check most thermistor temperature
sensors, pressure transducers, pumps and their associated flow de-
vices, the oil reclaim output, the head pressure output, and other
control outputs such as tower fans, oil heaters, alarm relay, and hot
gas bypass. The tests can help to determine whether a switch is de-
fective or if a pump relay is not operating, as well as other useful
troubleshooting issues. During pumpdown operations, the pumps
must energize to prevent freeze-up.
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CAUTION