Carrier 19XL specifications Initial START-UP, Dry Run to Test Start-Up Sequence, Check Rotation

INITIAL START-UP

Preparation Ð Before starting the chiller, check that the:

1.Power is on to the main starter, oil pump relay, tower fan starter, oil heater relay, and the chiller control center.

2.Cooling tower water is at proper level, and at or below design entering temperature.

3.Chiller is charged with refrigerant and all refrigerant and oil valves are in their proper operating position.

4.Oil is at the proper level in the reservoir sight glasses.

5.Oil reservoir temperature is above 140 F (60 C) or re- frigerant temperature plus 50° F (28° C).

6.Valves in the evaporator and condenser water circuits are open.

NOTE: If pumps are not automatic, make sure water is circulating properly.

7.Solid-state starter checks: The Power +15 and the Phase Correct LEDs must be lit before the starter will energize. If the Power +15 LED is not on, incoming voltage is not present or is incorrect. If the Phase Correct LED is not lit, rotate any 2 incoming phases to correct the phasing.

Do not permit water or brine that is warmer than 110 F (43 C) to ¯ow through the cooler or con- denser. Refrigerant overpressure may discharge through the relief devices and result in the loss of refrigerant charge.

8.Press RELEASE to automate the chiller start/stop value

on the Status01 table to enable the chiller to start. The initial factory setting of this value is overridden to stop in order to prevent accidental start-up.

Manual Operation of the Guide Vanes Ð Manual operation of the guide vanes is helpful to establish a steady motor current for calibration of the motor amps value.

In order to manually operate the guide vanes, it is nec- essary to override the TARGET GUIDE VANE POSITION value which is accessed on the Status01 table. Manual con- trol is indicated by the word ``SUPVSR!'' ¯ashing after the target value position. Manual control is also indicated on the default screen on the run status line.

1.Access the Status01 table and look at the target guide vane position (Fig. 16). If the compressor is off, the value will read zero.

2.Move the highlight bar to the TARGET GUIDE VANE POSITION line and press the SELECT softkey.

3.Press ENTER to override the automatic target. The screen

will now read a value of zero, and the word ``SUPVSR!'' will ¯ash.

4.Press the SELECT softkey, and then press RELEASE softkey to release the vanes to AUTO-

MATIC mode. After a few seconds the ``SUPVSR!'' will disappear.

Dry Run to Test Start-Up Sequence

1.Disengage the main motor disconnect on the starter front panel. This should only disconnect the motor power. Power to the controls, oil pump, and starter control circuit should still be energized.

2.Look at the default screen on the LID: the Status mes- sage in the upper left-hand corner will read, ``Manually Stopped.'' Press CCN or Local to start. If the chiller

controls do not go into start mode, go to the Schedule screen and override the schedule or change the oc-

cupied time. Press the LOCAL softkey to begin the start- up sequences.

3.Check that chilled water and condenser water pumps energize.

4.Check that the oil pump starts and pressurizes the lubri- cation system. After the oil pump has run about 11 sec- onds, the starter will be energized and go through its start-up sequence.

5.Check the main contactor for proper operation.

6.The PIC will eventually show an alarm for motor amps not sensed. Reset this alarm and continue with the initial start-up.

Check Rotation

1.Engage the main motor disconnect on the front of the starter panel. The motor is now ready for rotation check.

2.After the default screen Status message states ``Ready for Start'' press the LOCAL softkey; start-up checks will be made by the control.

3.When the starter is energized and the motor begins to turn. Check for clockwise rotation (Fig. 32).

IF ROTATION IS PROPER, allow the compressor to come up to speed.

IF THE MOTOR ROTATION IS NOT CLOCKWISE (as viewed through the sight glass), reverse any 2 of the 3 incoming power leads to the starter and recheck rotation.

NOTE: Solid-state starters have phase protection and will not allow a start if the phase is not correct. Instead, a Starter Fault message will occur if this happens.

Do not check motor rotation during coastdown. Rota- tion may have reversed during equalization of vessel pressures.

Fig. 32 Ð Correct Motor Rotation

NOTES ON SOLID-STATE STARTERS (Benshaw, Inc.)

1.When the compressor is energized to start by the 1CR relay, con®rm that the Relay On LED is lit on the starter SCR control board. The compressor motor should start to turn immediately when this light comes on. If not, adjust the start torque potentiometer in a clockwise direction.

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