System information
28
Once a year the pressure transducers should be checked
against a pressure gage. Attach a set of accurate refrigeration
gages to the tranducer being checked and compare the two
readings. If there is a difference the transducer can be calibrat-
ed as described below (the Oil Pump Delta P reading should be
zero when the compressor is off). Calibration requires Service
level access to the HMI.
NOTE: It is usually not necessary to calibrate at initial start-up
unless chiller is at high altitude.
1. Go to Main Menu Maintenance Menu Pressure
Sensor Calib. See Fig. 38 and 39.
2. Each transducer is supplied with 5 vdc from the IOB.
Calibration is done by selecting the appropriate Pressure
Sensor option on the Pressure Sensor Calib screen. The
screen for the selected option is displayed. Figure 40
shows the Evap Pressure Sensor screen as an example.
3. With the transducer at atmospheric pressure (zero gage
pressure), ensure that “Calib Press1 (0 PSI)” = 0 PSIG.
4. Pressurize the transducer to a known pressure between
100 and 250 psig, and enter that known pressure in the
“Calib Press2 (100-250PSI)” field.
5. 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.
ALARM EMAIL — The alarm email function sends auto-
matic email messages to specified service personnel for remote
maintenance purposes. Use the service configuration table
EMAILCFG, available from page 2 of the Configuration
menu, to set up the email function. After the EMAILCFG table
configuration is done, a test email will be sent. See Fig. 41-43.
a19-2233
PRESSURE - Pressures
Fig. 36 — PRESSURE Screen, Page 1
a19-2234
PRESSURE - Pressures
Fig. 37 — PRESSURE Screen, Page 2
a19-2235
Pressure Sensor Calib
Fig. 38 — Pressure Sensor Calib Screen, Page 1
a19-2236
Pressure Sensor Calib
Fig. 39 — Pressure Sensor Calib Screen, Page 2
a19-2237
PRSCAL01 - Evap Pressure Sensor
Fig. 40 — Evap Pressure Sensor Screen