High Altitude Locations; Quick Test; Quick Calibration; Pumpdown/Lockout - Carrier AquaEdge 19DV Series Start-Up, Operation And Maintenance Instructions Manual

4. If the transducer value is not within the calibration range,
the transducer returns to the original reading. If the pres-
sure is within the allowed range (noted above), check the
voltage ratio of the transducer. To obtain the voltage ratio,
divide the voltage (dc) input from the transducer by the
supply voltage signal or measure across the positive
(+ red) and negative (– black) leads of the transducer. The
input to reference voltage ratio must be between 0.80 and
0.11 for the software to allow calibration. Rotate the
waterside flow pressure device from the inlet nozzle to the
outlet nozzle and repeat this step. If rotating the waterside
flow device does not allow calibration, pressurize the
transducer until the ratio is within range. Then attempt cal-
ibration again.
5. Installation of pressure transducers into water nozzles using
flushable dirt leg trap is suggested; see Fig. 46. Pressures
can be calibrated between 100 and 250 psig (689.5 and
1723.7 kPa) by attaching a regulated 250 psig (1724 kPa)
pressure (usually from a nitrogen cylinder). For calibration,
access the Pressure Sensor Calibration Menu from the
Maintenance Menu and calibrate the appropriate sensor.
The PIC6 control system does not allow calibration if the trans-
ducer is too far out of calibration. In this case, a new transducer
must be installed and re-calibrated.

High Altitude Locations

Because the chiller is initially calibrated at sea level, it is nec-
essary to recalibrate the pressure transducers if the chiller has
been moved to a high altitude location. Note that Atmospheric
SCHRADER VALVE
Fig. 46 — Suggested Installation of Pressure Transducers into Water Nozzles Using Flushable Dirt Leg Trap
Pressure can be adjusted in the Service Parameters Menu (lo-
cated in the Configuration Menu).

Quick Test

The Quick Test feature is located in the Main Menu. Use this
feature to test chiller status, test the status of various actuators,
view water temperature deltas, and test pump and relays, as
well as control inlet guide vane, EC (Envelope Control) valve,
alarms, condenser, and chilled water pumps. The tests can help
to determine whether a switch is defective or a pump relay is
not operating, as well as other useful troubleshooting issues.
During pumpdown operations, the pumps are energized to pre-
vent freeze-up and the vessel pressures and temperatures are
displayed.

Quick Calibration

Use this menu to calibrate IGVs and the EC valve if it has feed-
back.

Pumpdown/Lockout

The Pumpdown/Lockout feature, available from the Mainte-
nance Menu, prevents compressor start-up when there is no re-
frigerant in the chiller or if the vessels are isolated. The Termi-
nate Lockout feature ends the Pumpdown/Lockout after the
pumpdown procedure is reversed and refrigerant is added.

Physical Data

Tables 19-27 and Fig. 47-59 provide additional information on
component weights, compressor fits and clearances, physical
and electrical data, and wiring schematics for the operator's
convenience during troubleshooting.
1
/ NPTF TEE, BRASS
4
51
WATERBOX
NOZZLE
TWO (2) 2" PIPE NIPPLES
1
/ - 18 NPT
4
BALL VALVE