Carrier AquaEdge 19DV Controls Operation And Troubleshooting page 23

PRESSURE TRANSDUCER CALIBRATION
The HMI pressure readings are displayed in the Main Menu
Pressures screen. See Fig. 32.
Fig. 32 — Pressures Screen
Once a year the pressure transducers should be checked against a
pressure gage. Attach a set of accurate refrigeration gages to the
transducer being checked and compare the two readings. If there
is a difference the transducer can be calibrated as described be-
low. Calibration requires Service level access to the HMI.
NOTE: It is usually not necessary to calibrate at initial start-up un-
less chiller is at high altitude.

1. Go to Main Menu
Sensor Calib. See Fig. 33.
Fig. 33 — Pressure Sensor Calib Screen, Page 1
2. Each transducer is supplied with 5 vdc from the IOB. Cal-
ibration is done by selecting the appropriate Pressure Sen-
sor option on the Pressure Sensor Calib screen. The screen
for the selected option is displayed. Figure 34 shows the
Evap Pressure Sensor screen (PRSCAL01 as an example).

Maintenance Menu Pressure

Fig. 34 — Evap Pressure Sensor Screen
3. Set Calibration Enable to Enable.
Calibration for this sensor is complete and the new slope
and intercept will be used for the calibrated transducer in
the pressure or temperature tables.
4. With the transducer at atmospheric pressure (zero gage
pressure), ensure that "Calib Press1 (0 PSI)" = 0 PSIG.
5. Pressurize the transducer to a known pressure between 100
and 250 psig, and enter that pressure as read from cali-
brated gage in the "Calib Press2 (10-30PSI)" field and
press "OK."
6. Screen will show "Calibration Completed = Yes" upon
successful calibration. To exit, use the arrow key or click
the Home button.
TEMPERATURE SENSOR CALIBRATION
The four water temperature sensors can be separately calibrat-
ed to have their temperature readings offset by a specified
amount. Follow these steps for each sensor:
1. Go to Main Menu
sor Calib. See Fig. 35 and 36.
Fig. 35 — Maintenance Menu Calibration, Page 1
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 
Maintenance Menu Temp Sen-