IOM 1206-7 • TRAILBLAZER
™
MODEL AGZ CHILLERS
34 www.DaikinApplied.com
Electrical Data Notes
1. Power wiring connections to the chiller may be done with
either copper or aluminum wiring. Copper wire should be
sized per NEC and/or local codes. Aluminum wire should
be installed in accordance with NECA/AA 10402012,
Standard for Installing Aluminum Building Wire and
Cable (ANSI). Wire sizing and wire count must fit in the
power connection lug sizing shown in the Electrical Data
tables starting on
page 37
.
2. 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.
3. Recommended Fuse Sizes are selected at approximately
175% of the largest compressor RLA, plus 100% of all
other loads in the circuit.
4. Maximum Fuse or breaker size is equal to 225% of the
largest compressor RLA, plus 100% of all other loads.
5. 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.
6. Wire sizing amps is 15 amps if a separate 115V power
supply is used for the control circuit.
7. 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.
8.
All field wire lug range values given in Electrical Data
starting on
page 37
apply to 75°C rated wire per NEC.
9. Must be electrically grounded according to national and
local electrical codes.
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.
Circuit Breakers
Factory installed compressor circuit breakers are standard on
units with single point power supply only. This option provides
compressor short circuit protection and makes servicing easier
Voltage Limitations:
1. Within 10 percent of nameplate rating.
2. Voltage unbalance not to exceed 2% with a resultant
current unbalance of 6 to 10 times the voltage unbalance
per NEMA MG-1, 2009 Standard Rev. 1-2010.
Panel High Short Circuit Current Rating
(Previously known as “withstand rating”). The entire control
panel is designed for short circuit current rating as shown
in
Table 12
. In the event of a short circuit, the damage is
contained within the control panel enclosure.
Table 12: Standard and HSCCR Panel Ratings
Panel Type
208V / 230V
380V / 400V / 460V
575V
Standard
5kA
5kA
5kA
HSCCR
65kA
65kA
25kA
Electrical Control Center
Operating and equipment protection controls and motor
starting components are separately housed in a centrally
located, weather resistant control panel with hinged and
tool-locked doors. In addition to the MicroTech
®
III controller
described in the next sections, the following components are
housed in the panel:
• Power terminal blocks, multi-point connection standard
• Control, input, and output terminal block
• Control transformer
• Optional disconnect switch (through-the-door handle)
• Compressor motor inherent thermal and overload
protection is standard
• Optional phase voltage monitor with under/over voltage
and phase reversal protection
• Fan contactors with short circuit protective devices.
• Optional ground fault protection
• FanTrol
™
fan staging head pressure control system
• Power connections are per
Table 13
Power Connections
Table 13: Power Connection Availability
Power Connection
Power
Block
Disc .
Swt .
Comp .
Circuit
Breakers
Panel High
Short Circuit
Current Rating
Optional Single Point
Std.
Opt.
Std.
Opt.
Standard Multi-Point
Std.
Opt.
Not Avail.
Opt.
Switching from line voltage to generator power and vice versa
requires that the chiller must either be shut down or the power
must be off for more than a second to avoid sending out of
phase voltage to the operating motors. A properly installed
Synchronized Transfer Switch is the only time that a transfer
can be done while the chiller is running.
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.
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