Initial Start-Up; Manual Operation Of The Guide Vanes; Dry Run To Test Start-Up Sequence; Check Rotation (Open-Drive Motor) - Carrier 17 Start Up & Operation Manual

INITIAL START-UP

Preparation —
Before starting the machine, check that
the:
1. Power is on to the main starter, oil pump relay, tower fan
starter, oil heater relay, and the machine control
center.
2. Cooling tower water is at proper level, and at or below
design entering temperature.
3. Machine 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. Check the starter to ensure it is ready to start and that all
safety circuits have been reset. Be sure to keep the starter
door closed.
Do not permit water or brine that is warmer than 110 F
(43 C) to flow through the cooler or condenser. Refrig-
erant overpressure may discharge through the relief de-
vices and result in the loss of refrigerant charge.
8. Press RELEASE to automate the chiller start/stop value
on the Status01 screen 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 —
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 screen. Manual con-
trol is indicated by the word ''SUPVSR!'' flashing after the
target value position. Manual control is also indicated on the
default screen on the run status line.
1. Access the Status01 screen and look at the target guide
vane position (Fig. 18). 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 flash.
4. Press the SELECT
RELEASE softkey to release the vanes to AUTO-
MATIC mode. After a few seconds the ''SUPVSR!'' will
disappear.
Manual
softkey, and then press

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 show a ''Manually
Stopped'' message. Press CCN or Local to start. If not,
go to the Schedule screen and override the schedule or
change the occupied 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 15 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 (Open-Drive Motor)

OPEN DRIVE MOTOR INITIAL START-UP

Initial Uncoupled Start-Up — The initial start-up of the mo-
tor should be made with the motor uncoupled. Verify that oil
has been added to each bearing housing to the correct level.
1. If the motor is equipped with unidirectional fans (refer to
the certified drawing) and verification of rotation direc-
tion is required, the following procedure should be
followed:
a. Start the motor and observe the rotation direction.
b. Allow the motor to achieve full speed before discon-
necting it from the power source.
c. If the rotation direction must be changed, refer to the
Before Initial Start-Up, Open Drive Motor Electrical
Connection section, page 47. Otherwise, the motor can
be restarted immediately after it has coasted to a stop.
2. Following the initial start-up, the bearing temperatures
should be closely monitored. On sleeve bearings, the free
rotation of the oil rings should be verified by observing
them through the viewing port in the top of the housing.
The rate of rise in bearing temperature is more indicative
of impending trouble than the actual temperature. If the
rate of rise in temperature is excessive or if the motor
exhibits excessive vibration or noise, it should be shut
down immediately and a thorough investigation made as
to the cause before it is operated again.
If the bearing temperature rise and motor operation ap-
pear to be normal, operation should continue until the bear-
ing temperatures stabilize. Recommended limits on bear-
ing temperature rises over ambient temperature are as
follows:
Sleeve Bearings
By permanently installed
detector
By temporary detector on top
of the bearing sleeve near the
oil ring
58
Temperature Rise
Over Ambient
Temperature
72° F (40° C)
63° F (35° C)