IOM 1207-6 • TRAILBLAZER
®
MODEL AGZ CHILLERS 64 www.DaikinApplied.com
Electrical Connection
Trailblazer
®
units can be ordered with either standard multi-
point power or optional single point power connections and
with various disconnect and circuit breaker options. Wiring
within the unit is sized in accordance with the NEC
®
.
Table 16: Power Connection Availability
Power
Connection
Power
Block
Disc.
Switch.
Comp.
Circuit
Breakers
Panel High
Short Circuit
Current Rating
Opt. Single Point Std. Opt. Std. Opt.
Std. Multi-Point Std. Opt. Not Avail. Opt.
Required eld wiring varies depending on unit conguration.
See Figure 62 and Figure 63 for wiring diagram information.
Voltage limitations are:
1. Within 10 percent of nameplate rating.
2. Voltage unbalance not to exceed 2%. Since a 2%
voltage unbalance can cause a current unbalance of 6
to 10 times the voltage unbalance per the NEMA MG-1
Standard, it is important that the unbalance between
phases be kept at a minimum.
DANGER
Qualied, licensed electricians must perform wiring. Electrical
shock hazard exists that can cause severe injury or death.
Power wiring connections to the chiller may be done with
either copper or aluminum wiring. All wiring must be done in
accordance with applicable local and national codes, including
NECA/AA 10402012, Standard for Installing Aluminum Building
Wire and Cable (ANSI). Wiring within the unit is sized in
accordance with the NEC
®
. Refer to the unit nameplate and
the unit selection report for the correct electrical ratings.
1. Unit wire size ampacity (MCA) is equal to 125% of the
largest compressor-motor RLA plus 100% of RLA of all
other loads in the circuit.
2. Recommended Fuse Sizes are selected at approximately
175% of the largest compressor RLA, plus 100% of all
other loads in the circuit.
3. Maximum Fuse or breaker size is equal to 225% of the
largest compressor RLA, plus 100% of all other loads.
4. The control transformer is furnished and no separate
115V power is required. For both single and multi-point
power connections, the control transformer is in circuit
#1 with control power wired from there to circuit #2. In
multi-point power, disconnecting power to circuit #1
disconnects control power to the unit.
5. Wire sizing supplied to the control panel shall be in
accordance with eld wiring diagram
6. Single-point power supply requires a single disconnect
to supply electrical power to the unit. This power supply
must either be fused or use a circuit breaker.
7. All eld wire lug range values given unit selection report
apply to 75°C rated wire per NEC.
8. Must be electrically grounded according to national and
local electrical codes.
DANGER
Disconnect, lockout and tag all power to the unit before
servicing condenser fan motors or compressors. Failure to do
so can cause bodily injury or death.
CAUTION
A static discharge while handling circuit boards can cause
damage to components. Use a static strap before performing
any service work. Never unplug cables, circuit board terminal
blocks, or power plugs while power is applied to the panel.
Panel High Short Circuit Current Rating
The entire control panel is designed for short circuit current
rating as shown in Table 17. In the event of a short circuit, the
damage is contained within the control panel enclosure.
Table 17: Standard and HSCCR Panel Ratings
208V / 230V 380V / 400V / 460V 575V
Standard 5kA 5kA 5kA
HSCCR 65kA 65kA 25kA
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 o for more than ve 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.
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.
WARNING
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 ve 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. Congure the transfer switch provided with the
generator to automatically shut down the chiller before
transfer is made. The automatic shut-o function can
be accomplished through a BAS interface or with the
“remote on/o” wiring connection shown in the eld
wiring diagrams.
A start signal can be given anytime after the stop signal since
the three-minute start-to-start timer will be in eect.
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