Initial Start-Up; Preparation; Check Motor Rotation - Carrier 19DV Series Installation, Operation And Maintenance Instructions

step. If rotating the waterside flow device does not allow calibration then pressurize the transducer until the ratio is
within range. Then attempt calibration again.
4. A high pressure point can be calibrated between 10-30 psig (68.9 -206.8 kPa) by attaching a regulated pressure
source (usually from a nitrogen cylinder with high resolution pressure gage). The high pressure point can be
calibrated by accessing the appropriate transducer parameter on the PRESSURES screen, highlighting the
parameter, then increasing or decreasing the value to the exact pressure on the refrigerant gage.
Pressures at high altitude locations must be compensated for, so the chiller temperature/pressure relationship is
correct. This is set in the Service Parameters (Configuration Menu). The PIC5+ does not allow calibration if the
transducer is too far out of calibration. In this case, a new transducer must be installed and re-calibrated.
IMPORTANT: When screen display calibration is complete, do not depress calibration Enable/Disable since the new
values will be deleted. Values are kept by exiting the pressure sensor table.

6. INITIAL START-UP

6.1 Preparation

Before starting the chiller, verify:
1. Power is on to the VFD, chiller control panel, water pumps, and other equipment as required.
2. Cooling tower water is at proper level and at-or-below design entering temperature.
3. Chiller is charged with refrigerant and all refrigerant valves are in their proper operating positions.
4. Valves in the evaporator and condenser water circuits are open and flow is as per design.
NOTE: If the pumps are not automatic, ensure water is circulating properly.

6.2 Check Motor Rotation

1. Close the VFD enclosure door.
2. Apply 3-phase power to drive.
3. The VFD checks for proper phase rotation as soon as power is applied to the starter and the PIC5+ controls
power up.
4. An alarm message will appear on the HMI screen if the phase rotation is incorrect. If this occurs reverse any 2
of the 3 incoming power leads to the starter and reapply power. The motor is now ready for a rotation check.
5. Go to Main Menu, Quick Test and Enable Quick Test following by enable Motor Rotation Check. This starts the
following sequence:
a. Fully open the first IGV.
b. Open evaporator control valve, condenser drain valve, close condenser control valve, and evaporator control
valve. Run refrigerant pump for 30 seconds.
c. Start the motor and ramp to 5 Hz in 10 seconds.
d. Once the motor speed reaches 5 Hz, stop motor.
e. Stop refrigerant pump 1 minute after motor speed reaches 5 Hz, then reset all 4 refrigerant lubrication valves to
close.
f. Three minutes after motor speed reaches 5 Hz, close first IGV.
Status can be followed in Quick test as Check State IDLE=0, PreLub=1, Rotat=2, PosLub=3, End=4.
6. When the VFD is energized and the motor begins to turn, check for clockwise motor rotation through first stage
sight glasses.
IMPORTANT: Do not check motor rotation during coastdown. Rotation may have reversed during equalization of
vessel pressures.
CORRECT MOTOR ROTATION IS CLOCKWISE WHEN VIEWED THROUGH SUCTION PIPE LEADING TO
COMPRESSOR 1ST STAGE SIGHT GLASS.
When rotation checking, do not let machine develop condenser pressure. Check rotation immediately. Allowing
condenser pressure to build or checking rotation while machine coasts down may give a false indication due to
gas pressure equalizing through compressor.
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