Recalibrate Pressure Transducers; Recalibrate Temperature Thermistors; Corrosion Control; Ordering Replacement Chiller Parts - Carrier 19DV Series Installation, Operation And Maintenance Instructions

Periodically vacuum accumulated debris on the internal parts. Use electrical cleaner for electrical parts as required.
Perform visual inspection of the capacitors located on the DC bus and inductors. Check cooling fan operation. Check
condensate drain for the VFD enclosure Power connections on newly installed starters may relax
and loosen after a month of operation. Turn power off and retighten. Recheck annually thereafter.
CAUTION: Loose power connections can cause voltage spikes, overheating, malfunctioning, or failures.

9.3.16 Recalibrate Pressure Transducers

Once a year, the pressure transducers should be checked against a pressure gage reading. Check all pressure
transducers: evaporator pressure, condenser pressure, refrigerant pump inlet pressure, refrigerant pump outlet
pressure, bearing inlet pressure, bearing outlet pressure, and evaporator entering and leaving water pressure, as
well as condenser entering and leaving water pressure.

9.3.17 Recalibrate Temperature Thermistors

Entering chilled water (ECW), leaving chilled water (LCW), entering condenser water (ECDW), leaving condenser
water (LCDW).

9.3.18 Corrosion control

All metallic parts of the unit (chassis, cabinets, panels, heat exchangers...) are protected against corrosion by a
coating of powder or liquid paint. To prevent the risk of blistering corrosion that can appear when moisture
penetrates under the protective coatings, it is necessary to carry out periodic checks of the coating (paint)
condition.

9.3.19 Ordering Replacement Chiller Parts

When ordering Carrier specified parts, the following information must accompany an order:
• chiller model number and serial number
• name, quantity, and part number of the part required
• delivery address and method of shipment.

10. TROUBLE SHOOTING GUIDE

10.1 overview

The PIC 5+ control system has many features to help the operator and technician troubleshoot a 19DV chiller.
•The PIC 5+ TOUCH SCREEN shows the chiller's actual operating conditions and can be viewed while the unit is
running.
• The PIC 5+ TOUCH SCREEN default screen indicates when an alarm occurs. Once all alarms have been
cleared (by correcting the problems), the PIC 5+ TOUCH SCREEN default screen indicates normal operation. For
information about displaying and resetting alarms and a list of alert codes, please refer to separated PIC5+ Control
User Manual.
• The Configuration menu screens display information that helps to diagnose problems with chilled water
temperature control, chilled water temperature control overrides, envelope control valve control, surge algorithm
status, and time schedule operation.
• The quick test feature facilitates the proper operation and test of temperature sensors, pressure transducers, the
guide vane actuator, refrigerant pump, water pumps, tower control, and other on/off outputs while the compressor
is stopped. It also has the ability to lock off the compressor and turn on water pumps for pumpout operation. The
PIC 5+ TOUCH SCREEN shows the temperatures and pressures required during these operations.
• If an operating fault is detected, an alarm indicator is displayed on the PIC 5+ TOUCH SCREEN default screen.
A more detailed message along with a diagnostic message is also stored in the Current Alarms table.
• Review the Alarms History table to view other less critical events which may have occurred. Compare timing of
relevant events and alarms.
For detailed information about alarms, please refer to separated PIC5+ Control User Manual. Press the bell icon in
the top right corner of the home screen to access current alarms and alarm history, and to reset alarms.

10.2 Checking Display Messages

The first area to check when troubleshooting the 19DV is the PIC 5+ TOUCH SCREEN display. Status messages
are displayed at the bottom of the screen, and the alarm icon indicates a fault. For a complete list of alarms,
please refer to separated PIC5+ Control User Manual.

10.3 Checking Temperature Sensors

All temperature sensors are NTC thermistor type sensors. This means that the resistance of the sensor varies with
temperature. All sensors have the same resistance characteristics. If the controls are on, determine sensor
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