Daikin Pathfinder AWV Installation, Operation And Maintenance Manual page 23

The field power wiring required varies depending on unit
model. See page 24 and page 25
These wiring diagrams are also provided with the chiller.
NOTE: Wiring, fuse, and wire size must be in accordance
with the NEC . The voltage to these units must be
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within ±10% of nameplate voltage (415V units must
have voltage within -13% and +6% of nameplate
voltage) and the voltage unbalance between phases
must not exceed 2%. Since a 2% voltage unbalance
will cause a current unbalance of 6 to 10 times the
voltage unbalance per the NEMA MG-1 Standard, it
is most important that the unbalance between phases
be kept at a minimum.
CAUTION
Do not use power factor correction capacitors with AWV
chillers. Doing so can cause harmful electrical resonance in
the system. Correction capacitors are not necessary since
VFDs inherently maintain high power factors.
Table 3: SCCR Ratings (kAmps)
Standard Short
Voltage/Hz
Circuit Panel Rating
380/60 10kA
460/60 10kA
575/60
400/50 10kA
Field-supplied disconnect switches are required if not factory-
supplied with the unit. Disconnecting means are addressed by
Article 440 of the 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.
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Terminals are provided in a 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.
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 five seconds to avoid
sending out of phase voltage to the chiller. A properly installed,
fully synchronized Automatic Transfer 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.
www.DaikinApplied.com
for wiring information.
High Short Circuit
Panel Rating
65kA
65kA
5kA 25kA
65kA
Installation and Application Considerations
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.
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 Automatic Transfer
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 the
"remote on/off" wiring connection shown in the field
wiring diagrams.
A start signal can be given anytime after the stop signal since
the start-to-start timer will be in effect. The default timer setting
is 5 minutes but adjustable as low as 3 minutes.
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 a 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.
For additional tasks required, contact a Daikin Applied service
representative.
23 IOM 1242-8 • PATHFINDER
WARNING
CAUTION
MODEL AWV CHILLERS
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