Check Refrigerant Lube; To Prevent Accidental Start-Up; Check Chiller Operating Condition; Instruct The Customer Operator - Carrier 19DV Series Installation, Operation And Maintenance Instructions

6.3 Check Refrigerant Lube

1. In Quick Test the refrigerant lube pressure can be checked. First open cooler valve and condenser drain valve,
then run the refrigerant pump. Usually the pressure drop across bearing is above 55 kPa. If the bearing pressure
drop is negative, please check pump rotation. If bearing pressure drop is below 55 kPa, please check if the
moisture filter is clogged.
2. Press the Stop button and listen for any unusual sounds from the compressor as it coasts to a stop.

6.4 To Prevent Accidental Start-Up

A chiller STOP override setting may be entered to prevent accidental start-up during service or whenever
necessary. From the Main Menu, access the General Parameters Menu and use the down arrow to reach Stop
Override on the GENUNIT table. Change Stop Override to Yes; then execute the command by touching the
lightning button. The message "ALM-276 Protective Limit - Stop Override" will appear in the Home Screen
message area. To restart the chiller, access the same screen and change the Stop Override option to No.

6.5 Check Chiller Operating Condition

Check to be sure that chiller temperatures, pressures, water flows, and refrigerant levels indicate the system is
functioning properly.

6.6 Instruct the Customer Operator

Ensure the operator( s) understand all operating and maintenance procedures. Point out the various chiller parts
and explain their function as part of the complete system.

6.6.1 Cooler - Condenser

High side float chamber, relief devices, refrigerant charging valve, temperature sensor locations, pressure
transducer locations, Schrader fittings, waterboxes and tubes, and vents and drains.

6.6.2 Motor compressor assembly

Guide vane actuator, transmission, motor cooling system, temperature and pressure sensors, sight glasses, motor
temperature sensors, and compressor serviceability.

6.6.3 Compressor Lubrication System

Valves, dryers and filters, liquid level switch.

6.6.4.Economizer

Float valve, drain valve, Schrader fitting, economizer isolation valve.

6.6.5 Control system

CCN and LOCAL start, reset, menu, softkey functions, HMI operation, occupancy schedule, set points, safety
controls, and auxiliary and optional controls.

6.6.6 Purge

Check for potential leaks by monitoring purge hours in RUNTIME. Note changes over time.

6.6.7 Auxiliary equipment

Starters and disconnects, separate electrical sources, pumps, and cooling tower.

6.6.8 Describe chiller cycles

Refrigerant, motor cooling, lubrication, and liquid reclaim.

6.6.9 Review maintenance

Scheduled, routine, and extended shutdowns, importance of a log sheet, importance of water treatment and tube
cleaning, and importance of maintaining a leak-free chiller.

6.6.10 Safety devices and procedures

Electrical disconnects, relief device inspection, and handling refrigerant.

6.6.11 Check operator knowledge

Start, stop, and shutdown procedures, safety and operating controls, refrigerant charging, and job safety.
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