Table of Contents
Advertisement
INITIAL START-UP
IMPORTANT: Startup engineer is to be properly certified for
the starter/VFD. Extended VFD warranty may be affected.
Preparation
Before starting the chiller, verify:
1.
Power is on to the main starter, oil pump relay, tower fan
starter, oil heater relay, and the chiller control panel.
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 positions.
4.
Oil is at the proper level in the reservoir sight glasses.
5.
Oil reservoir temperature is above 140F (60C) or above
CALC EVAP SAT TEMP plus 50F (28C).
6.
Valves in the evaporator and condenser water circuits are
open and water pressure differentials are equal to unit design.
NOTE: If the pumps are not automatic, ensure water is circu-
lating properly.
CAUTION
Do not permit water or brine that is warmer than 110F (43°C)
to flow through the cooler or condenser. Refrigerant
overpressure may discharge through the relief valves and
result in the loss of refrigerant charge.
7.
Access the PUMPDOWN/LOCKOUT feature from the
Maintenance Menu. Press the End Lockout button on the
touch screen and accept the "press OK to Terminate Lock-
out?" prompt. The unit is reset to operating mode. The
chiller is locked out at the factory in order to prevent acci-
dental start-up.
Check Motor Rotation
1.
Disengage the main starter disconnect and engage the con-
trol panel power circuit breaker.
NOTE: The circuit breaker may be located in the starter if the
disconnect and step down transformer option was ordered
with the starter. If located in the starter, close the door
securely after this step.
2.
Close the starter enclosure door.
3.
The starter checks for proper phase rotation as soon as
power is applied to the starter and the PIC6 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.
Start the chiller by Local On (assumes LOCAL operation
mode) by pressing the Start/Stop button on the HMI and
following the prompts. The PIC6 control performs start-up
checks.
6.
When the starter is energized and the motor begins to turn,
check for clockwise motor rotation (Fig. 35).
IMPORTANT: Do not check motor rotation during coastdown.
Rotation may have reversed during equalization of vessel
pressures.
Check Oil Pressure and Compressor Stop
1.
When the motor is at full speed, note the differential oil
pressure reading on the HMI default screen. It should be
between 18 and 40 psid (124 and 206 kPad). The oil pump
will generate design oil pressure only with the correct
electrical phasing of ABC.
2.
Press the Stop button and listen for any unusual sounds
from the compressor as it coasts to a stop.
Fig. 35 — Correct Motor Rotation
To Prevent Accidental Start-Up
A chiller STOP override setting may be entered to prevent acci-
dental 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.
Check Chiller Operating Condition
Check to be sure that chiller temperatures, pressures, water flows,
and oil and refrigerant levels indicate the system is functioning
properly.
Instruct the Customer Operator
Ensure the operator(s) understands all operating and maintenance
procedures. Point out the various chiller parts and explain their
function as part of the complete system.
COOLER-CONDENSER
High side float chamber, relief valves, refrigerant charging valve,
temperature sensor locations, pressure transducer locations,
Schrader fittings, waterboxes and tubes, and vents and drains.
OPTIONAL PUMPOUT STORAGE TANK AND PUMP-
OUT SYSTEM
Transfer valves and pumpout system, refrigerant charging and
pumpdown procedure, and relief devices.
MOTOR COMPRESSOR ASSEMBLY
Guide vane actuator, transmission, motor cooling system, oil
cooling system, temperature and pressure sensors, oil sight
glasses, integral oil pump, isolatable oil filter, extra oil and motor
temperature sensors, synthetic oil, and compressor serviceability.
MOTOR COMPRESSOR LUBRICATION SYSTEM
Oil pump, cooler filter, oil heater, oil charge and specification, op-
erating and shutdown oil level, temperature and pressure, and oil
charging connections.
ECONOMIZER
Float valve, drain valve, Schrader fitting, damper valve.
37
Advertisement
Table of Contents
