Daikin Navigator WWV - Unit Startup Procedures; Temporary Shutdown Procedure; Startup After Temporary Shutdown

MAINTENANCE
NAVIGATOR WWV/TWVDAIKIN APPLIED
56
Startup
DANGER
Prevent lint, paper bers, dust, metallic chips, or other foreign
material from getting into the inverter or accumulating on VFD
cooling outlets, the heat sink, circuit boards, control panels, or
other electrical devices. Failure to do so may a󰀨ect operation
of the VFD, void warranty, result in a re, unit damage, property
damage, severe personal injury, or death. Frequently inspect
area around inverter, heatsink, and other electrical devices to
ensure they are free of foreign material.
NOTICE
Dyes used for refrigerant leak detection are not tested or
recommended for use in Daikin Applied chillers. Use of these
products may damage and/or degrade the performance of the
equipment and will void the manufacturer warranty.
1. Double check that the discharge shuto󰀨 valve and the
optional compressor suction buttery valves are open.
2. Check that the manual liquid-line shuto󰀨 valves at the
outlet of the subcooler coils are open.
3. Check the leaving chilled water temperature set point
on the MicroTech unit controller to be sure it is set at the
desired chilled water temperature.
4. Start the auxiliary equipment for the installation by turning
on the time clock, and/or remote on/o󰀨 switch, and chilled
water pump.
5. Under the “Control Mode” menu of the keypad, place the
unit into the automatic cool mode.
Temporary Shutdown
Move pumpdown switches Q1 and Q2 to the “Pumpdown and
Stop” position. After the compressors have pumped down, turn
o󰀨 the chilled water pump.
CAUTION
Water ow to the unit must not be interrupted before the
compressors pump down to avoid freeze-up in the evaporator.
Interruption will cause equipment damage.
Startup After Temporary Shutdown
1. Start the chilled water pump.
2. With System switch Q0 in the “on” position, move
pumpdown switches Q1 and Q2 to the “auto” position.
3. Observe the unit operation until the system has stabilized.
Extended (Seasonal) Shutdown
1. Move Q1 & Q2 switches to manual pumpdown position.
2. After the compressors have pumped down, turn o󰀨 the
chilled water pump.
3. Turn o󰀨 all power to unit and to the chilled water pump.
4. Move the emergency stop switch S1 to the “o󰀨” position.
5. Close the compressor discharge valve and the optional
compressor suction valve (if so equipped) as well as the
liquid line shuto󰀨 valves.
6. Tag all opened compressor disconnect switches to warn
against startup before opening the compressor suction
valve and liquid line shuto󰀨 valves.
Startup After Extended (Seasonal)
Shutdown
1. With all electrical disconnects locked and tagged out, check
all screw or lug-type electrical connections to be sure they
are tight for good electrical contact.
2. Check the voltage of the unit power supply and see that
it is within the ±10% tolerance that is allowed. Voltage
unbalance between phases must be within ±2%.
3. See that all auxiliary control equipment is operative and
that an adequate cooling load is available for startup.
4. Check all compressor ange connections for tightness to
avoid refrigerant loss. Always replace valve seal caps.
5. Make sure system switch Q0 is in the “Stop” position. Turn
compressor circuit breakers to “o󰀨” position until ready to
start unit.
6. Open optional compressor suction buttery as well as the
liquid line shuto󰀨 valves, compressor discharge valves.
7. Vent the air from the evaporator water side as well as from
the system piping. Open all water ow valves and start the
chilled water pump. Check all piping for leaks and recheck
for air in the system.
8. Set chilled water setpoint to the required temperature.
9. Under the “Control Mode” menu of the keypad, place the
unit into the automatic cool mode.
10. Start the system by moving pumpdown switches to “auto”
position.
General Maintenance
On initial startup and periodically during operation, it will be
necessary to perform certain routine service checks. Among
these are checking the liquid line sight glasses, and the
compressor oil level sight glass. In addition, check the MicroTech
unit controller temperature and pressure readings with gauges
and thermometers to see that the unit has normal condensing
and suction pressure and superheat and subcooling readings.
A Periodic Maintenance Log is located at the end of this manual.
It is suggested that the log be copied and a report be completed
on a regular basis. The log will serve as a useful tool for a service
technician in the event service is required.
Initial startup date, vibration readings, and oil analysis information
should be kept for reference base-line data.
If the service technician has determined that the refrigerant