Daikin Navigator WWV Installation, Operation And Maintenance Manual page 13

Table 5: Short Circuit Current Ratings (kAmps)
High Short Circuit
Voltage/Hz
Panel Rating
460/60
380/60
400/50
575/60
Field-supplied disconnect switches are required if not factory-
supplied with the unit. Disconnecting means are addressed
by Article 440 of the U.S.A. National Electrical Code (NEC),
which requires "disconnecting means capable of disconnecting
air conditioning and refrigerating equipment including motor-
compressors, and controllers from the circuit feeder." Select
and locate the disconnect switch per the NEC guidelines.
Control Circuit
The unit control circuit is powered at 120 Vac. Terminals are
provided in the unit control panel for optional field hookup of
the control circuit to a separate fused 115-volt power supply in
lieu of the standard factory installed control transformer.
Water flow switch interlock terminals are included in the
controller. See Field Wiring Diagram - Single Point Power on
page 14 for the correct connections in the field. The purpose
of the water flow switch interlock is to prevent the compressor
from running while the evaporator and condenser water pumps
come online and provide the correct water flow.
It is best to leave pump control to the unit controller for better
system management. If an external system independently
manages pump starts, use the following guidelines:
• Turn on evaporator pump 2 minutes before enabling the
machine
• Turn off evaporator pump 5 minutes after disabling the
machine
Use with On-Site Generators
Switching from site grid power to generator power and vice
versa requires that the chiller must either be powered down
or the power must be off for more than 5 seconds to avoid
sending out of phase voltage to the chiller. A properly installed,
fully Synchronized AutomaticTransfer Switch must be used to
transfer power if the chiller is running under load.
Generator Sizing
WARNING
Generator must be sized by an electrical engineer familiar
with generator applications.
Transfer Back to Grid Power
Proper transfer from stand-by generator power back to grid
power is essential to avoid chiller damage and must be used to
ensure proper function of the unit.
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Stop the chiller before transferring supply power from the
generator back to the utility power grid. Transferring power
while the chiller is running can cause severe chiller damage.
The necessary procedure for reconnecting power from the
generator back to the utility grid is as follows:
1. Set the generator to always run five minutes longer than
the unit start-to-start timer, which can be set from two to
sixty minutes, while keeping the chiller powered by the
generator until the fully Synchronized AutomaticTransfer
Switch properly hands over chiller power from the site.
2. Configure the transfer switch provided with the generator
to automatically shut down the chiller before transfer
is made. The automatic shut-off function can be
accomplished through a BAS interface or with "remote
on/off" wiring connection shown in
Wiring Diagram - Single Point Power" on page 14.
A start signal can be given anytime after the stop signal since
the three-minute start-to-start timer will be in effect.
Long Term Storage
This information applies to new units being stored waiting
for startup or to existing units that may be inoperative for an
extended period of time.
The chiller must be stored in a dry location and protected from
any damage or sources of corrosion. A Daikin Applied service
representative must perform an inspection and leak test of the
unit on minimum quarterly schedule, to be paid by the owner
or contractor. Daikin Applied will not be responsible for any
refrigerant loss during the storage time or for repairs to the
unit during the period of storage, or while moving the unit from
the original location to a storage facility and back to any new
installation location. If there is concern about the possibilities of
damage and loss of charge during storage, the customer can
have the charge removed and stored in recovery cylinders.
If the temperature of where the chiller is located is expected to
exceed 130°F (54.4°C), then the refrigerant must be removed.
Should it be necessary to store the unit prior to installation, it is
necessary to observe some precautions.
• Do not remove the protective plastic
• Do not leave the unit exposed to the elements
• Do not expose the unit to direct sunlight
• Do not use the machine near a heat source and/or open
flame
• Keep in places where room temperature is between +
41°F (5°C) to 130°F (54.4°C) (room temperature over the
maximum limit may trigger the relief valve resulting in loss
of refrigerant).
For additional tasks required, contact a Daikin Applied service
representative.
13 IOM 1264-1 • NAVIGATOR
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WARNING
"Figure 10: Field
CAUTION
MODEL WWV CHILLERS
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