This catalog covers air-cooled, single circuit, R-407C, scroll compressor chillers and
condensing units as follows:
ACZ 010BS – ACZ 039BS condensing units, 10 to 39 tons
AGZ 010BS – AGZ 034BS packaged chillers, 10 to 34 tons
AGZ 010BM – AGZ 034BM chiller with remote, 10 to 34 tons, matching water cooler, shipped
separately for field installation, usually indoors
These units utilize a single refrigerant circuit using a set of tandem scroll compressors. They
continue Daikin’s legacy of high quality, high efficiency, latest technology and quiet operation.
These features make the ACZ and AGZ the best overall value in air-cooled units available today.
Latest Control Technology
These units have the latest control technology through utilization of Daikin’s MicroTech II
microprocessor. Integrating with your building automation system is easy with the Daikin’s Open
Choices feature using LONMARK, BACnet or Modbus network communication, requiring only
the addition of a small communication module to the unit controller.
Compact Size
Our reputation for compact designs with small footprints to minimize space requirements continues to be
a primary feature.
Quiet Operation
The ACZ and AGZ units further enhance Daikin’s reputation for low operating sound levels to
make these units “neighborhood friendly”.
NOMENCLATURE
A C Z 010 B S
Air-cooled
C = Condensing Unit
G = Packaged Chiller
Scroll Compressor Nominal Capacity (Tons)
S = Standard Unit
M = Remote Evaporator
Vintage
Catalog 616
3
Features and Benefits
ACZ-AGZ, Single Circuit Units
Great values also come in small packages. The ACZ and AGZ units have a single refrigerant circuit with
capacities from 10 to over 34 tons. Customer benefits include high efficiency operation, low sound levels,
efficient and reliable scroll compressor technology, and MicroTech II controls.
High Efficiency Operation
These units operate at high efficiency with IPLVs up to 14.6 EER. Through the use of tandem scroll
compressors and the latest control technology, excellent part load performance occurs. With a single
compressor running, the entire unit’s condenser surface is utilized, lowering condenser pressure and
reducing power input.
Quiet Operation
ACZ and AGZ units have low sound ratings through the use of scroll compressors. These compressors are
housed in a sheet metal enclosure to further reduce the levels. All units have a sound power rating of 90
dBA or less. For additional sound attenuation, optional acoustic blankets are also available. See page 25
re information regarding our low sound levels.
o
for m
Superior Control with MicroTech II
They have the MicroTech II controller providing control strategies expected of much larger units.
Building Automation System Integration
The MicroTech II controller allows for easy BAS integration through our Open Choice feature using
ONMARK, BACnet or Modbus communications. This is another advanced feature typical of larger units.
L
Figure 1, Model ACZ 033, 30-ton Condensing Unit
4Catalog 616
Design Features
The Daikin air-cooled, scroll compressor units are a product of Daikin’s commitment to offer
quiet, reliable, energy efficient equipment. These units incorporate high quality compressors,
state-of-the-art coil design, and innovative packaging.
Construction
Factory assembled and mounted on a heavy-gauge steel channel base. The base rails, supports and cabinetry are
powder-coat painted. The base distributes the unit weight for roof loading. Varied and convenient installation is
possible by virtue of the unit's small footprint.
Compressors
Copeland’s Compliant Scroll tandem compressors are used. These rugged hermetic compressors are
constructed with an integral cast iron frame, cast iron scrolls, three Teflon impregnated bearings, and three oil
filtration devices for each compressor.
Using Copeland's Compliant Scroll tandem compressors provides two steps of capacity modulation. One
compressor can run alone, depending on the load of the system, utilizing the entire unit’s condenser surface,
which results in excellent part-load efficiency. The refrigerant circuit has specially designed oil and gas
equalization lines to control oil migration.
The design also offers radial and axial compliance (no tip seals), a large internal volume for liquid handling, a
removable suction screen, and a rotary dirt trap and oil screen. In addition, the compressor is self-compensating
for wear, handles liquid and debris, and inherently yields the highest efficiency for its class.
This well protected compressor includes a solid-state motor protection module, 4 individual motor-winding
sensors, a patented internal discharge temperature probe, and a patented shutdown feature that prevents reverse
rotation. An internal discharge check valve helps prevent shutdown noise and comes standard with high and
low pressure taps with Schrader valves, a sight glass, an oil level adjustment valve, and an off cycle crankcase
heater.
Units are available in 60 Hertz electrical voltage configurations from 208 to 575 volt operating at 3500 rpm.
Condenser Coils
Condenser coils have internally enhanced seamless copper tubes arranged in a staggered row pattern. The
coils are mechanically expanded into Daikin lanced and rippled aluminum fins with full fin collars. A variety
of optional coil material and coatings are available for corrosive atmospheres. The external condenser coils are
fitted with a protective wire mesh guard as standard equipment.
Condenser Fans and Motors
Multiple direct-drive, dynamically balanced, propeller fans operate in formed venturi openings at low tip
speeds for maximum efficiency and minimum noise and vibration. A heavy-gauge vinyl-coated fan guard
protects each fan.
Each condenser fan motor is heavy-duty, 3-phase, Totally Enclosed Air Over (TEAO) with permanently
lubricated ball bearings and inherent overload protection. SpeedTrol option includes a single-phase motor with
fan speed control on the lead fan.
Evaporator
Stainless steel, brazed plate evaporators are used on the AGZ units. They have counter-flow operation and very
high efficiencies.
Catalog 616
5
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 II controller described in the next sections, the following components are housed in the panel:
Standard single-point, terminal block connection
Control, input, and output terminal block
Control transformer
Phase voltage monitor with under/over voltage and phase reversal protection
Fan contactors with short circuit protective devices
The standard FanTrol head pressure control system controls refrigerant discharge pressure by fan
staging. The FanTrol system cycles condenser fans based on discharge pressure and outdoor temperature and
is designed for operation down to 35°F (1.7°C).
Optional SpeedTrol™ control using both fan cycling and fan speed control on the lead fan per circuit and
allows operation to 0°F (-18°C) outdoor temperature.
Mechanical high pressure cutout
Power connections are per following table:
Power Connection
ACZ 010-039, Single-Point Connection Std. Opt Not Avail. Opt. Opt.
AGZ 010-034 Single Point Connection Std. Opt Not Avail. Opt. Opt.
Power
Block
Disc.
Swt.
Comp.
Circuit
Breakers
Definitions:
1. Power Block: An electrical device to directly accept field wiring without any disconnecting means.
2. Disconnect Switch: A molded case switch that accepts field wiring and disconnects main power to the
entire unit or each main power supply if the multi-point power supply option is selected. This option does
not provide overcurrent protection.
3. Unit Circuit Breaker with High Interrupting Capacity: A molded case circuit breaker acting as the
main disconnect switch with short circuit current rating (formally known as “withstand”). One circuit
breaker is provided. The circuit breaker provides overcurrent protection for the power supply.
4. Control Panel High Short Circuit Current Rating: (Previously known as “withstand rating”). The
entire control panel is designed for short circuit current rating. In the event of a short circuit, the damage
is contained within the control panel enclosure.
High Interr
Disconnect Switch
Current Rating
High Short Circuit
Current Rating w/
Disconnect Switch
Control System
The MicroTech II
systems available today on this class of equipment. This powerful, user-friendly control system provides
the flexibility and performance needed for either stand-alone unit operation or the controller can be easily
tied into your building automation system of choice using Daikin’s exclusive Open Choices feature that
allows you to choose from open standard protocols such as BACnet, Modbus, and LonTalk to
communicate easily with the building automation system that best meets your facility requirements. These
optional communications modules are available factory-installed or can be easily field installed.
MicroTech II’s state-of-the-art design will not only permit the unit to run more efficiently, but will also
simplify troubleshooting if a system failure occurs. Every MicroTech II controller is programmed and tested
prior to shipment.
Operator-friendly
The MicroTech II control menu structure is separated into four distinct categories that provide the operator or
service technician with a full description of current unit status, control parameters, and alarms. Security
protection helps prevent unauthorized changing of the setpoints and control parameters.
MicroTech II continuously performs self-diagnostic checks, pressures and protection devices, monitoring
system temperatures, and it will automatically shutdown a compressor, or the entire unit, if a fault occurs. The
6Catalog 616
advanced DDC unit controller surpasses all other microprocessor-based unit control
cause of the shutdown will be retained in memory and can be easily displayed in English or metric units for
operator review.
The MicroTech II unit controller can also retain and display the time that the fault occurred and the operating
conditions that were present at the time of the fault, an extremely useful feature for troubleshooting. In
addition to displaying alarm diagnostics, the MicroTech II controller also provides the operator with a
warning of pre-alarm conditions. Alarm notification data can also be passed on to your BAS through an
optional communications module.
Staging
On ACZ condensing units, temperature control for the system is provided by the installer through a field
supplied temperature controller. The field-supplied staging signals are provided to the MicroTech II controller
which correspondingly activates and deactivates the scroll compressors. The temperature controller is
required to close normally-open 24 volt contacts on a demand for cooling. These closure signals are field
wired to the terminal strip (TB2) in the condensing unit. Refer to the typical field wiring diagram on page 34
wo control stages are required:
for details.
Lead/lag is automatic and switched based on operating hours and compressor starts.
T
Equipment Protection
The unit is protected in two ways: (1) by alarms that shut the unit down and require manual reset to restore
unit operation and (2) by limit alarms that reduce unit operation in response to some out-of-limit condition.
Shut down alarms can activate a remote alarm signal. Limit alarms activate a signal on the controller.
Shutdown Alarms
High condenser pressure
No chilled water flow
Motor protection sy
Phase voltage protection (Optional on ACZ-B and
Outside am
Sensor failures
Limit Ala
rms
Condenser pressure stage down, unloads unit at high dischar
Low am
Low evaporator pressure hold, holds stage #1 until pressure rises
Low evaporator pressure unload, shuts off stage #2
bient temp
bient lockout, shuts off unit at low ambient temp
stem
AGZ-B)
erature
ge pressures
eratures
Unit Enable Selection
Enables unit operation from either local keypad, digital input, or BAS
Unit Mode Selection
Selects standard cooling, or test operation mode
Digital Inputs
Unit off switch
Remote start/stop
Flow switch
Digital Outputs
Shutdown alarm; field wired, activates on an alarm condition, off when alarm is cleared
Evaporator pump or air handler fan motor; field wired, starts when unit is set to start
Catalog 616
7
Condenser fan control
The MicroTech II controller provides control of condenser fans. The controller stages condenser fans based
on discharge pressure.
Building Automation System (BAS) Interface
The following BAS standard protocols are supported through Daikin’s Open Choices option:
BACnet/IP
BACnet MS/TP
BACnet Ethernet
L
onTalk
Modbus
The following functions are generally available depending on the application and protocol in use:
Enable/disable operation
Select operating mode
Set the network limit variable
Read all digital and analog inputs and outputs
Read operating mode and status
Send a description of each alarm when it occurs
Keypad/Display
A 4-line by-20 character/line liquid crystal display and 6-key keypad is mounted on the unit controller. Its
layout is shown in
1Figure 2.
Figure 2, MicroTech II
Keypad
Menu Button
"Enter" Button
The four arrow buttons (UP, DOWN, LEFT, RIGHT) have three modes of use.
Scroll between data screens as indicated by the arrows (default mode).
Select a specific data screen in a hierarchical fashion using dynamic labels on the right side of the display
(this mode is entered by pressing the MENU button).
Change field values in edit mode.
8Catalog 616
Figure 3, ACZ/AGZ-B Control Panel
Optional Remote Interface Panel
The ACZ/AGZ units can be individually equipped with a
remote user interface. It provides convenient access to
unit diagnostics and control adjustments, remote from
the condensing unit panel. A separate panel is required
for each chiller on a job site.
Each remote user interface is similar to its unit-mounted
counterpart and offers the same functionality, including:
Touch-sensitive keypad with a 4 line by 20-character
display format
Digital display of messages in English language
All operating conditions, system alarms, control
parameters
Figure 4, Remote Interface Panel Dimensions
Features
Can be wired up to 1,640 feet (500 m
unit for flexibility in placing each rem
eters) from the
ote user interface
within your building.
The main control is isolated from the remote user interface
wiring so that wiring problems are less likely to damage the
unit user interface.
Can be placed on a desk or surface or recessed wall mounted.
Benefits
Allows y
ou to access the user interface for each unit from
one location, inside the building.
Users need to learn one format because the rem
ote user
interface is identical to the unit-mounted version.
No additional field commissioning is required for the remote user interface.
Can be retrofit after unit installation.
All the BAS communications options are still available with the remote interface panel.
Cable and Wiring Recommendations
No more than 1,640 feet (500 m
eters) of wiring can be used to connect the remote user interface to the unit.
Power: AWG 22 twisted pair cable.
Communications: Belden 9841 or equal AWG 22 twisted pair.
A separate small communication terminal board is used at the unit and at the remote panel.
Catalog 616
9
Figure 5, Remote User Interface Wiring Diagram
p
D
A
r
pLAN
cable
Chiller Terminal Board
0 1 2 3 4 5 6
sc
pLAN phone style
cable to J10 of
Display Terminal Board
chiller Unit control
Note:
Maximum distance between terminal
blocks is 1640 feet (500 m)
A
0 1 2 3 4 5 6
sc
Power is supplied through
30 Vdc +
Power Common
RX+/Tx+
Rx-/Tx-
Shield
AWG22 twist ed pair cable
Communications cable is
Belden 9841 or equivalent
WG22 twisted pai
10Catalog 616
ACZ Condensing Unit Performance
Selection Procedure
ACZ condensing units are selected in conjunction with some kind of evaporator equipment. The ACZ ratings
are based on saturated suction temperature at the compressor inlet and on ambient air dry-bulb temperature. For
a system selection, the ACZ condensing unit is usually selected first, and then the line loss added to the
condensing unit saturated suction temperature to determine the saturated evaporating temperature. This
temperature is then used for the selection of the evaporator, whether it is a DX cooling coil or water heat
exchanger. The pipe size can be determined from procedures and data in the Refrigerant Piping Section. For
selection purposes, the tubing size is based on a pressure equivalent of a two-degree F line loss (equal to about
3-psi pressure drop).
uiredjob capacity by
The correction for altitude found in Table 1 is applied, if applicable, by dividing the re
the correction factor to ascertain the necessary unit capacity in the Capacity Tables.
R-407C NOTE: R-407C is an azeotrope and as such has a glide characteristic. An evaporator mid-point
temperature will be about four-degrees higher than the dew point temperature. For example, an R-22 evaporator
selected at a 40F evaporating temperature would be comparable to 44F with R-407C.
Selection example, Inch-Pound units
Given:
200 Mbh job requirement 95°F ambient temperature
40F saturated suction temperature 2,000 foot altitude
R-22
1. To select the correct size unit, correct for altitude by dividing the required capacity by
factor found in T
2. From Table 2 on the following page, an ACZ 020 at th
unit power input of 20.0 kW
3.
Correct for altitude:
Capacity: 202.5 Mbh x 0.986 = 200 Mbh
Power: 20.0 kW x 1.009 = 20.2 kW
EER: 10.1 EER x 0.986/1.009 = 9.9 EER
4. An evaporator would be selected at 42F saturated evaporating temperature.
able 1.
ent.
e given conditions will produce 202.5 Mbh with a
and a unit EER of 10.1.
q
the correction
Selection example-SI units
Use the same procedure as for Inch-Pounds but use SI tables and units.
Application Adjustment Factors
Altitude Correction Factors
Performance tables are based at sea level. Elevations other than sea level affect the performance of the unit.
The decreased air density will reduce condenser capacity, consequently reducing the unit's performance.
Table 1, Altitude Correction Factors
Altitude CapacityPower
Sea Level 1.000 1.000
2000 ft (610 m) 0.986 1.009
4000 ft (1220) m 0.973 1.021
6000 ft (1830) m 0.959 1.031
Catalog 616
11
ACZ Performance Data
Table 2, R-407C, I-P Units, 60 Hz
Suction
ACZ
Dewpoint
Unit
Size
010
013
016
020
025
028
033
039
NOTES:
1.Ratings based on R-407C, and sea level altitude.
2.
3.KWi and EER are for the entire unit, including compressors, fan motors and control power.
Interpolation is allowed; extrapolation is not permitted. Consult the local Daikin sales office for performance outside the cataloged
ratings.
Fan &
Control
Power
(kW)
75 8595 105 115
Unit
PWR
Unit
Unit
Mbh
kWi
EER
PWR
Mbh
Ambient Air Temperature (F)
Unit
Unit
kWi
EER
PWR
Mbh
kWi
105.8 9.7 10.9
145.0 13.4 10.8
192.1 19.3 10.0
217.6 21.0 10.4
292.0 28.2 10.4
319.5 32.6 9.8
376.3 38.1 9.9
462.6 51.8 8.9
Unit
Unit
PWR
Unit
EER
Mbh
kWi
99.9 10.4 9.6 93.9 11.3 8.3
136.6 14.6 9.4 129.3 15.9 8.1
182.1 21.0 8.7 170.9 22.9 7.5
205.6 22.9 9.0 192.5 24.9 7.7
276.1 30.7 9.0 258.9 33.4 7.8
302.2 35.4 8.5 282.5 38.4 7.4
355.4 41.6 8.5 334.5 45.4 7.4
434.6 56.2 7.7 405.5 60.6 6.7
EER
Unit
Mbh
PWR
kWi
Unit
EER
12Catalog 616
Table 3, R-407C, SI, 60 Hz
ACZ
Unit
Size
010
013
016
020
025
028
033
039
NOTES:
1.
2.
3.
Suction
Dewpoint
Temp
(C)
-1
11
13
-1
11
13
-1
11
13
-1
11
13
-1
11
13
-1
11
13
-1
11
13
-1
11
13
Fan &
Control
Power
(kW)
2
5
8
2
5
8
2
5
8
2
5
8
2
5
8
2
5
8
2
5
8
2
5
8
Ratings based on R-407C and sea level altitude.
Interpolation is allowed; extrapolation is not permitted. Consult the local Daikin sales office for performance outside the
cataloged ratings.
KWi and COP are for the entire unit, including compressors, fan motors and control power.