McQuay AGZ030BS, AGZ035BS, AGZ045BS, AGZ050BS, AGZ055BS Installation, Operation And Maintenance Manual
...
Installation, Operation and Maintenance Manual
Air-Cooled Scroll Compressor Chiller
AGZ 026B through 130B
60 Hertz, R-22
IOMM A G Z- 5
Group: Chiller
Part Number: 330411801
Effective: October 2004
Supercedes: IOMM A GZ -4
Table of Contents
Introduction.......................................3
General Description......................................3
Inspection.....................................................3
Nomenclature...............................................3
Installation......................................... 4
Handling.......................................................4
Location........................................................5
Vibration Isolators......................................12
Ambient and Water Flow Limitations.........14
Water Piping...............................................14
Flow Switch................................................16
Water Connections......................................17
System Water Volume Considerations........17
Variable Speed Pumping ............................17
Glycol Solutions.........................................17
Evaporator Flow and Pressure Drop...........21
Wind Baffles and Hail Guards....................23
Optional Features............................25
Physical Data ...................................28
Electrical Data - Standard Ambient33
Electrical Data - High Ambient......43
Compressor Control................................... 61
Condenser Fan Control.............................. 65
Optional Low Ambient VFD...................... 67
Using the Controller .................................. 77
Startup..............................................91
Pre Start-up................................................ 91
Start-Up ..................................................... 91
Shutdown................................................... 92
Water Piping Checkout.............................. 92
Refrigerant Piping Checkout...................... 92
Electrical Check Out.................................. 93
Operation..........................................93
Hot Gas Bypass (Optional)........................ 93
VFD Low Ambient Control (Optional)...... 94
Filter-Driers............................................... 94
System A djustment.................................... 94
Liquid Line Sight Glass............................. 94
Refrigerant Charging ................................. 95
Thermostatic Expansion Valve .................. 95
Crankcase Heaters ..................................... 95
Evaporator ................................................. 95
Unit Maintenance.............................96
Preventive Maintenance Schedule............. 97
Dimensional Data............................ 51
MicroTech II Controller .................54
Controller Section Table of Contents.........54
Overview....................................................55
General Description....................................55
Logging......................................................59
Control Logic.............................................60
Chilled Water Pump Control ......................61
This manual also replaces
Our facility is ISO Certified
"McQuay" is a registered trademark of McQuay International
Illustrations and data cover McQuay International products at the time of publication and we reserve the right to
make changes in design and construction at anytime without notice.
2002 McQuay International
Service...............................................98
Liquid Line Solenoid Valve....................... 98
Evaporator ................................................. 99
Refrigerant Charging ................................. 99
Warranty Statement ......................100
AGZ Troubleshooting Chart.........101
IOMM AGR-1
2 AGZ 026B through 130B IOMM AGZ-5
Introduction
General Description
McQuay Air-Cooled Global Water Chillers are complete, self-contained automatic
refrigerating units. Every unit is completely assembled, factory wired, charged, and
tested. Each unit consists of twin air-cooled condensers with integral subcooler
sections, two tandem or triple scroll compressors, brazed-plate or replaceable tube,
dual circuit shell-and-tube evaporator, and complete refrigerant piping. Liquid line
components include manual liquid line shutoff valves, sight-glass/moisture indicators,
solenoid valves, and thermal expansion valves. Other features include compressor
crankcase heaters, an evaporator heater for chilled water freeze protection, limited
pumpdown during “on” or “off” periods, automatic compressor lead-lag to alternate the
compressor starting sequence, and sequenced starting of compressors.
The electrical control center includes all equipment protection and operating controls
necessary for dependable automatic operation. Condenser fan motors are protected in
all three phases and started by their own three-pole contactors.
Inspection
Check all items carefully against the bill of lading. Inspect all units for damage upon
arrival. Report shipping damage and file a claim with the carrier. Check the unit
nameplate before unloading, making certain it agrees with the power supply available.
McQuay is not responsible for physical damage after the unit leaves the factory.
Note: Unit shipping and operating weights are available in the Physical Data
tables beginning on page 28.
Nomenclature
A G Z - XXX B S
Scroll Compressor
Air-Cooled
Global
Application
S= Standard Cooling
M= Remote Evaporator
Design Vintage
Model Size
(Nominal Tons)
IOMM AGZ-5 AGZ 026B through 130B 3
Installation
Note: Installation is to be performed by qualified personnel who are familiar
with local codes and regulations.
WARNING
Sharp edges on unit and coil surfaces are a potential hazard to personal safety.
Avoid contact with them.
Handling
Be careful to avoid rough handling of the unit. Do not push or pull the unit from
anything other than the base. Block the pushing vehicle away from the unit to prevent
damage to the sheet metal cabinet and end frame (see Figure 1).
To lift the unit, 2 1/2" (64mm) diameter lifting tabs are provided on the base of the
unit. Arrange spreader bars and cables to prevent damage to the condenser coils or
cabinet (see Figure 2).
Figure 1, Suggested Pushing Arrangement
Blocking is required
across full width
Figure 2, Suggested Lifting Arrangement
Number of fans may vary
from this diagram. The lifting
Spreader bars
Spreader bars
required
required
(use caution)
(use caution)
method will remain the same.
All rigging locations
must be used.
4 AGZ 026B through 130B IOMM AGZ-5
Location
A
A
Unit Placement
AGZ units are for outdoor applications and
can be mounted either on a roof or at ground
Figure 3, Clearances
SEE ATTACHED TABLE
DIMENSION “A”
level. For roof mounted applications, install
the unit on a steel channel or I-beam frame to
support the unit above the roof. For ground
level applications, install the unit on a
4 FT. (1220mm)
CLEARANCE FOR
SERVICE ACCESS
substantial base that will not settle. A onepiece concrete slab with footings extended
below the frost line is recommended. Be sure
the foundation is level within 1/2" (13mm)
SEE ATTACHED TABLE
DIMENSION “A”
over its length and width. The foundation
must be strong enough to support the weights
listed in the Physical Data Tables beginning on page 28.
Table 1, Recommended Minimum Clearances
Model Size
026B – 070B 4 (1.2) 8 (2.4) 6 (1.8) 4 (1.2) 4 (1.2)
075B – 130B 6 (1.8) 12 (3.6) 8 (2.4) 4 (1.2) 4 (1.2)
Coil Side “A”
ft (m)
“B”
ft (m)
“C”
ft (m)
End Opposite
Controls ft (m)
Control Panel End
Clearances
Do not block the flow of air to and
from the condenser coil. Restricting
airflow or allowing air recirculation
will result in a decrease in unit
performance and efficiency because
discharge pressures are increased.
There must be no obstruction above
the unit that would deflect discharge
air downward where it could be
recirculated back to the inlet of the
condenser coil. The condenser fans
are propeller type and will not
operate with ductwork.
Install the unit with enough side
clearance for air to enter the coil and
for servicing. Provide service access
to the evaporator, compressors,
electrical control panel and piping
components.
Do not allow debris to accumulate
near the unit where it could be drawn
into the condenser coil. Keep
condenser coils and fan discharge
free of snow or other obstructions to
permit adequate airflow for proper
operation.
AIR FLOW
The recommended minimum side clearance be tween two units
is dimension “B’ in table on this page.
AIR FLOW
The unit must not be installed in a pit or encl osure that is
deeper or taller than the height of the unit unless extra space
is provided. The minimum clearance on each
side of the unit is dimension “C” in tabl e on this page.
AIR
DISCHARGE
AIR FLOW
DISCHARGE
“C” “C”
ft. (m)
“B”
AIR
4 FT. (1220)
CLEARANCE FOR
SERVICE ACCESS
AIR
DISCHARGE
IR FLOW
IR FLOW
IOMM AGZ-5 AGZ 026B through 130B 5
Restricted Air Flow
General
The clearances required for design-life operation of AGZ air-cooled condensers are
described in the previous section. Occasionally, these clearances cannot be maintained
due to site restrictions such as units being too close together or a fence or wall
restricting airflow, or both.
Fortunately, the McQuay AGZ chillers have several features that can mitigate the
problems attributable to restricted airflow.
• The condenser section is shaped as shown Figure 4. This allows inlet air for these
coils to come in from either side. A vertical coil and its adjacent angled coil are
manifolded together to serve one refrigerant circuit.
• The MicroTech II control is proactive in response to “off-design conditions”. In
the case of single or compounded influences restricting airflow to the unit, the
microprocessor will act to keep the compressor(s) running (possibly at reduced
capacity) rather than allowing a shut-off on high discharge pressure.
• The MicroTech II control can be programmed to sequence the compressors in the
most advantageous way. For example, in the diagram shown below, it might be
desirable to program circuit #1 to be the lag circuit (last circuit to reach full load)
during periods of high ambient temperatures.
Figure 4, Coil and Fan Arrangement
Building
Circuit #1 Circuit #2
NOTE: Models AGZ 026 to 035 do not have an interior slanted coil.
The following sections discuss the most common situations of condenser air restriction
and give capacity and power adjustment factors for each. Note that in unusually severe
conditions, the MicroTech II controller would adjust the unit operation to remain
online until a less severe condition is reached.
6 AGZ 026B through 130B IOMM AGZ-5
Case 1, Building or Wall on One Side of One Unit
A
The existence of a screening wall or the wall of a building in close proximity to an air-cooled
chiller is common in both rooftop and ground level applications. Hot air recirculation on the
coils adjoining the wall will increase compressor discharge pressure, decreasing capacity and
increasing power consumption. Only the compressor(s) connected to these coils will be
affected. Circuits opposite the wall are unaffected.
When close to a wall, it is desirable to place chillers on the north or east side of them. It is
also desirable to have prevailing winds blowing parallel to the unit’s long axis. The worst
case is to have wind blowing hot discharge air into the wall.
Figure 5, Unit Adjacent to Wall
H
Figure 6, Adjustment Factors
3.0
2.0
1.0
.5
D
GZ
075-130
4.5 ft.
(1.4m)
6 ft.
(1.8m)
8 ft.
(2.4m)
AGZ
026-070
3.5 ft.
(1.0m)
4 ft.
(1.2m)
6 ft.
(1.8m)
4.0
3.0
2.0
AGZ
6 ft.
8 ft.
AGZ
026-070
3.5 ft.
(1.0m)
4 ft.
(1.2m)
6 ft.
(1.8m)
075-130
4.5 ft.
(1.4m)
(1.8m)
(2.4m)
0
IOMM AGZ-5 AGZ 026B through 130B 7
0
Case 2, Two Units Side By Side
A
A
A
A
Two or more units sited side by side are common. If spaced closer than 12 feet (3.7 meters) or
8 feet (2.5meters) depending on size, it is necessary to adjust the performance of each unit;
circuits adjoining each other are affected. NOTE: This case applies only to two units side by
side. See Case 3 for three or more parallel units. If one of the two units also has a wall
adjoining it, see Case 1. Add the two adjustment factors together and apply to the unit located
between the wall and the other unit.
Mounting units end to end will not necessitate adjusting performance. Depending on the
actual arrangement, sufficient space must be left between the units for access to the control
panel door opening and/or evaporator tube removal. See “Clearance” section of this guide for
requirements for specific units.
Figure 7, Two Units Side by Side
Figure 8, Adjustment Factor
3.0
2.0
1.0
0
GZ 075-130
GZ 026-070
9
(2.7)
6.5
(2.0)
10
(3.0)
7
(2.1)
11
(3.3)
7.5
(2.2)
12
(3.6)
8
(2.4)
GZ 075-130
GZ 026-070
6.0
4.0
2.0
0
9
(2.7)
6.5
(2.0)
10
(3.0)
7
(2.1)
11
(3.3)
7.5
(2.2)
12
(3.6)
8
(2.4)
8 AGZ 026B through 130B IOMM AGZ-5
Case 3, Three or More Units Side By Side
A
A
A
A
When three or more units are side by side, the outside chillers (1 and 3 in this case) are
influenced by the middle unit only on their inside circuits. Their adjustment factors will be the
same as Case 2. All inside units (only number 2 in this case) are influenced on both sides and
must be adjusted by the factors shown below.
Figure 9, Three or More Units
GZ 075-130
GZ 026-070
Chiller 1 Chiller 2 Chiller 3
Figure 10, Adjustment Factor
4.0
3.0
2.0
1.0
0
15
(4.6)
11
(3.3)
16
(4.9)
12
(3.7)
17
(5.2)
13
(4.0)
18
(5.5)
14
(4.3)
GZ 075-130
GZ 026-070
8.0
6.0
4.0
2.0
0
15
(4.6)
11
(3.3)
16
(4.9)
12
(3.7)
17
(5.2)
13
(4.0)
18
(5.5)
14
(4.3)
IOMM AGZ-5 AGZ 026B through 130B 9
Case 4, Open Screening Walls
Decorative screening walls are often used to help conceal a unit either on grade or on a rooftop.
These walls should be designed such that the combination of their open area and distance from
the unit do not require performance adjustment. It is assumed that the wall height is equal to or
less than the unit height when mounted on its base support. This is usually satisfactory for
concealment. If the wall height is greater than the unit height, see Case 5, Pit Installation.
The distance from the ends of the unit to the end walls should be sufficient for service, opening
control panel doors, and pulling evaporator tubes, as applicable.
If each side wall is a different distance from the unit, the distances can be averaged providing
either wall is not less than 8 feet (2.4 meters) from the unit. For example, do not average 4 feet
and 20 feet to equal 12 feet.
Figure 11, Open Screening Walls
Figure 12, Wall Free Area vs Distance
AGZ
026-070
4
(1.2)
3.5
(1.0)
3.0
(0.9)
2.5
(0.7)
AGZ
075-130
6
(1.8)
5
(2.0)
4
(1.2)
3
(0.9)
01020304050
10 AGZ 026B through 130B IOMM AGZ-5
Case 5, Pit/Solid Wall Installation
Pit installations can cause operating problems and great care should be exercised if they are
to be used on an installation. Recirculation and restriction can both occur. A solid wall
surrounding a unit is substantially the same as a pit and the data presented here should be
used.
Steel grating is sometimes used to cover a pit to prevent accidental falls or trips into the pit.
The grating material and installation design must be strong enough to prevent such accidents,
yet provide abundant open area or serious recirculation problems will occur. Have any pit
installation reviewed by McQuay application engineers prior to installation to make sure it
has sufficient air-flow characteristics. The installation design engineer must approve the
work to avoid the risk of accident.
Figure 13, Pit Installati on
Figure 14, Adjustment Factor
D=4
(1.4)
D=6
(1.8)
D=5
(2.0)
D=8
(2.4)
075-130
D=10
AGZ
026-070
AGZ
075-130
AGZ
(3.1)
AGZ
026-070
D=7
(2.1)
D=4
(1.4)
D=6
(1.8)
D=5
(2.0)
D=8
(2.4)
AGZ
075-130
D=10
(3.1)
AGZ
026-070
D=7
(2.1)
AGZ
026-070
AGZ
075-130
IOMM AGZ-5 AGZ 026B through 130B 11
Sound Isolation
N
The low sound level of the AGZ chiller is suitable for most applications. When additional
sound reduction is necessary, locate the unit away from sound sensitive areas. Avoid
locations beneath windows or between structures where normal operating sounds may be
objectionable. Reduce structurally transmitted sound by isolating water lines, electrical
conduit and the unit itself. Use wall sleeves and rubber isolated piping hangers to reduce
transmission of water or pump noise into occupied spaces. Use flexible electrical conduit to
isolate sound transmission through electrical conduit. Spring isolators are effective in
reducing the low amplitude sound generated by scroll compressors and for unit isolation in
sound sensitive areas.
Vibration Isolators
Vibration isolators are recommended for all roof mounted installations or wherever
vibration transmission is a consideration. Table 2 lists isolator loads for all unit sizes.
Neoprene-in-Shear Dimensions
Color Code L W H B C D
Gray 5.5 3.37 1.75 0.5 4.12 0.56
Black, Red 6.25 4.62 1.62 0.5 5.0 0.56
Spring Isolator Dimensions
Figure 15 shows isolator locations. See Dimensional Data starting on page 51 for detailed
mounting hole locations.
Isolators are also recommended for slab installations, primarily to keep the unit base from
resting its entire length directly on the slab.
Isolator Installation
The unit should be initially installed on shims or blocks at the listed free height. When all
piping, wiring, flushing, charging, etc. is completed, adjust the springs upward to load
them and to provide clearance to remove the shims or blocks.
Installation of spring isolators requires flexible piping connections and at least three feet of
conduit flex tie-ins. Piping and conduit must be supported independently of the unit.
Figure 15, Isolator Locations
6 FAN UNIT 8 FAN UNIT
CONTROL
PANEL
OTE: 4-fan uni ts are same as 6-fan units . See Table 2 for number of fans and mounting location weights.
12 AGZ 026B through 130B IOMM AGZ-5
34
12
CONTROL
PANEL
45
12
6
3
Table 2, AGZ-BS, Isolator Loads At Each Mounting Location (With Aluminum Fins)
No.
Unit
Size
026B 4 1281 580 941 426 1020 462 748 339 - - - - 3990 1807 72 32
030B 4 1297 588 952 431 1032 467 759 344 - - - - 4040 1830 72 32
035B 4 1283 581 942 427 1069 484 786 356 - - - - 4080 1848 72 32
040B 4 1360 616 940 426 1082 490 748 339 - - - - 4130 1871 72 32
045B 4 1377 624 952 431 1148 520 793 359 - - - - 4270 1934 72 32
050B 4 1384 627 1016 460 1153 522 847 384 - - - - 4400 1993 119 54
055B 4 1391 630 1085 492 1159 525 905 410 - - - - 4540 2057 119 54
060B 4 1410 639 1099 498 1175 532 916 415 - - - - 4600 2084 142 65
065B 4 1382 626 1214 550 1205 546 1059 480 - - - - 4860 2202 142 65
070B 4 1419 643 1246 564 1238 561 1087 492 - - - - 4990 2260 217 99
075B 6 1854 840 1411 639 1854 840 1411 639 - - - - 6530 2958 217 99
085B 6 1942 880 1479 670 1856 841 1413 640 - - - - 6690 3031 217 99
090B 6 1975 895 1450 657 1975 895 1450 657 - - - - 6850 3103 217 99
100B 8 1464 663 1341 607 1219 552 1400 634 1282 581 1164 527 7870 3565 289 131
110B 8 1513 685 1358 615 1204 545 1513 685 1358 615 1204 545 8150 3692 289 131
120B 8 1656 750 1486 673 1317 597 1582 717 1420 643 1259 570 8720 3950 289 131
130B 8 1714 776 1508 683 1303 590 1714 776 1508 683 1303 590 9050 4100 289 131
of
Fans
1 2 3 4 5 6 Total Unit
lb kg lb kg lb kg lb kg lb kg lb kg lb kg lb. kg
NOTE (1): Additional weight for copper coils is per mounting location.
(1) Copper
Fin Add
Table 3, Isolator Kit Numbers
AGZ
Model
Spring Kit
Part No.
R-I-S Kit
Part No.
026, 030
035
330349603 330349603 330349605 330349606 330349607 330349609 330349612 330349613 330349614
330349702 330349703 330349704 330349704 330349705 330349706 330349707 330349708 330349709
040, 045
050
055 060 065, 070
075, 085
090
100 110 120,130
Table 4, Isolator Locations
AGZ-B, Chillers
Operating Weight. Neoprene-In-Shear Mountings Spring-Flex Mountings
Unit
Size
026B 3990 1807
030B 4040 1830
035B 4080 1848
040B 4130 1871
045B 4270 1934
050B 4400 1993
055B 4540 2057
060B 4600 2084
065B 4860 2202
070B 4990 2260
075B 6530 2958
085B 6690 3031
090B 6850 3103
100B 7870 3565
110B 8150 3692
120B 8720 3950
130B 9050 4100
NOTES:
1. Neoprene-in-shear isolators: Gray=RP-3 Gray, Black=RP-4 Black, Red=RP-4 Red.
lbs kg
1 2 3 4 5 6 1 2 3 4 5 6
Black Gray Gray Gray - - Orange Purple Purple Red - Black Gray Gray Gray - - Orange Purple Purple Red - Black Gray Gray Gray - - Orange Purple Purple Red - Black Gray Black Gray - - Orange Purple Purple Red - Black Gray Black Gray - - Orange Purple Purple Red - Black Gray Black Gray - - Orange Purple Purple Red - Black Black Black Gray - - Orange Purple Purple Purple - Black Black Black Gray - - Orange Purple Orange Purple - Black Black Black Black - - Orange Orange Orange Purple - Black Black Black Black - - Orange Orange Orange Purple - -
Red Black Red Black - - Gray Orange Gray Orange - Red Black Red Black - - Gray Orange Gray Orange - Red Black Red Black - - Gray Orange Gray Orange - -
Black Black Black Black Black Black Orange Orange Orange Orange Orange Orange
Red Black Black Red Black Black Green Orange Orange Green Orange Orange
Red Red Black Red Red Black Green Green Orange Green Green Orange
Red Red Black Red Red Black Green Green Orange Green Green Orange
IOMM AGZ-5 AGZ 026B through 130B 13
Ambient and Wa ter Flow Limitations
AGZ units are designed to operate in temperatures as show in the following table.
Table 5, Unit Maximum Operating Ambient Temperature
AGZ Unit Model
AGZ 026B – 130B
Standard
Controls
115°F 105°F 125°F
The VFD Low Ambient Control Option on models AGZ 026B to 130B imposes an additional heat
load on the control panel limiting operation to 105°F ambient temperature. The addition of the
High Ambient Panel Option allows operation to 125°F ambient temperature.
Compressor loading and unloading is adaptively determined by system load, ambient air
temperature, and other inputs to the MicroTech II control algorithms. A low ambient fan VFD
option allows operation down to 0°F (-18°C). The minimum ambient temperature is based on still
conditions where the wind is not greater than five mph. Greater wind velocities will result in
reduced discharge pressure, increasing the minimum operating ambient temperature. Field installed
hail/wind guards are available to allow the chiller to operate effectively down to the ambient
temperature for which it was designed.
Evaporator flow rates below the minimum values can result in laminar flow causing freeze-up
problems, scaling and poor control. Flow rates above the maximum values will result in
unacceptable pressure drops and can cause excessive erosion, potentially leading to failure.
w/ Low Ambient
VFD Control Option
w/ or w/o Low Ambient VFD Control
Plus High Ambient P anel Option
Water Piping
Local authorities can supply the installer with the proper building and safety codes required for safe
and proper installation.
Install piping with minimum bends and changes in elevation to minimize pressure drop. The following
issues must be considered when designing and installing water piping:
1. Vibration eliminators to reduce vibration and noise transmission to the building.
2. Shutoff valves are required to isolate the unit from the piping during unit servicing.
3. Manual or automatic air vent valves at the high points of the system. Drains must be installed at
the lowest points in the system.
4. Adequate water pressure must be maintained (expansion tank or regulating valve).
5. Temperature and pressure indicators located at the unit are required to aid in unit servicing.
6. A strainer or other means of removing foreign matter from the water before it enters the pump must
be installed. Place the strainer far enough upstream to prevent cavitation at the pump inlet (consult
pump manufacturer for recommendations). The use of a strainer will prolong pump life and keep
system performance up.
7. A strainer must
prevent foreign material from entering and decreasing the evaporator performance.
8. The unit’s evaporator has a thermostat and heater to prevent freeze-up down to -20°F (-29°C).
The heating cable can be wired to a separate 115V supply circuit. As shipped from the factory, the
heating cable is wired to the control circuit. All water piping to the unit must also be protected to
prevent freezing.
be installed in the water line before the inlet of the evaporator. This will help
14 AGZ 026B through 130B IOMM AGZ-5
CAUTION
If separate disconnect is used for the 115V supply to the evaporator heating cable,
mark the disconnect clearly to ensure the disconnect is not accidentally shut off during
cold seasons causing a possible damaging evaporator freeze-up.
9. If the unit is used as a replacement chiller, flush the system thoroughly before unit
installation. Regular water analysis and chemical water treatment for the
evaporator loop is recommended immediately at equipment start-up.
10. The total water volume in the system should be sufficient to prevent frequent “onoff” cycling. Turnover rate should not be less than 4 minutes for normal variable
cooling loads.
11. When glycol is added to the water system for freeze protection, the refrigerant
suction pressure will be lower, cooling performance less, and water side pressure
drop greater. If the percentage of glycol is high, or if propylene is used instead of
ethylene glycol, the added pressure drop and loss of performance could be
substantial. When Glycol or Ice are selected as Unit Mode, the MicroTech II will
automatically reset the available range for the Leaving Water Temperature,
Freezestat and Evaporator Pressure settings.
12. Reset the freezestat setting to approximately 4 to 5 degrees F (2.3 to 2.8 degrees C)
below the leaving chilled water setpoint temperature. See the section titled
“Glycol Solutions” for additional information concerning glycol.
13. Perform a preliminary leak check before insulating the piping and filling the
system.
14. Piping insulation should include a vapor barrier to prevent condensation and
possible damage to the building structure.
Figure 16, AGZ 075 – AGZ 130, Typical Field Evaporator Water Piping
THERMOWELL
T
INLET
T
IOMM AGZ-5 AGZ 026B through 130B 15
Figure 17, AGZ 026 - AGZ 070, Typical Field Evaporator Water Piping
A
ir
T
Inlet
Outlet
T
Thermowell
Vent
P
Drain
Vibration
Eliminators
Strainer
Isolation
Valves
Flow
Switch
NOTE: Outdoor piping must be protected if freezing temperatures are a possibility.
Flow Switch
Mount a water flow switch in the leaving water line to shut down the unit when water
flow is interrupted. A flow switch is an equipment protection control and should never
be used to cycle a unit.
A “paddle” type flow switch is available from McQuay (part number 017503300).
Certain minimum flow rates are required to close the switch and are listed in Table 6.
Installation should be as shown in Figure 18. Connect the normally open contacts of
the flow switch in the unit control center at terminals 44 and 61. There is also a set of
normally closed contacts on the switch that can be used for an indicator light or an
alarm to indicate when a “no flow” condition exists. Freeze protect any flow switch
that is installed outdoors. Manufacturer’s instructions included with the switch should
be followed.
NOTE: Differential pressure switches are not recommended for outdoor installation.
They can freeze and not indicate a no-flow condition.
Table 6, Flow Switch Minimum/Maximum Flow Rat es
Nominal Pipe Size
Inches (mm)
2 (50.8) 13.7 (51.8) 105 (397.4)
2 1/2 (63.50 17.9 (67. 8) 149 (564.0)
3 (76.20 24.2 (91.6) 230 (870.6)
4 (101.6) 35.3 (134.0) 397 (1502.7)
5 (127.0) 48.6 (184.0) 654 (2475.4)
6 (152.4) 60.3 (228.0) 900 (3406.5)
Note: See pressure drop table on page 18 for minimum and m axim um flow through the evaporator.
Minimum Required Flow To
Activate Switch - gpm (l/m)
Maximum Safe Flow Rate
gpm (l/m)
Figure 18, Flow Switch Instal lation
Flow direction marked on switch
1" (25mm) NPT flow switch
connection
Tee
16 AGZ 026B through 130B IOMM AGZ-5
Water Connections
T
D
Bring water piping to the evaporator through the side between the vertical supports.
Provide taps for the connection of pressure gauges and thermometers in the inlet and
outlet lines. Check the inlet and outlet labels on the unit against the certified drawings
supplied on the job and be sure the water piping is hooked up correctly. Contact the
McQuay sales office if any discrepancies exist.
System Water Volume Considerations
All chillers need adequate time to recognize a load change, respond to the change and
stabilize without short cycling the compressor. The water volume in the system and the
size of the piping loop is a critical consideration. Good engineering practice is to have
a minimum water volume of four times the flow rate (GPM) for comfort cooling
applications. For process applications where the load can change quickly, contact the
local McQuay sales office for recommendations. A water storage tank (provided by
others) may be required to increase the system water volume in some systems.
Since there are many other factors that can influence performance, systems can
successfully operate below these suggestions. However, as the water volume decreases
below these suggestions, the possibility of problems increases. We believe that these
guidelines should be an industry standard and not just recommendations from McQuay.
Variable Speed Pumping
Variable water flow involves reducing the water flow through the evaporator as the
load decreases. McQuay chillers are designed for this duty provided that the rate of
change in water flow is not greater than 10 percent of the change per minute.
The water flow through the vessel must remain between the minimum and maximum
values listed on page 22. If flow drops below the minimum allowable, large reductions
in heat transfer can occur. If the flow exceeds the maximum rate, excessive pressure
drop and tube erosion can occur.
Glycol Solutions
The use of a glycol/water mixture in the evaporator to prevent freezing will reduce
system capacity and efficiency, as well as increase pressure drop. The system capacity,
required glycol solution flow rate, and pressure drop with glycol may be calculated
using the following formulas and tables.
1. Capacity – Multiply the capacity based on water by the Capacity correction factor
from Table 7 through Table 10.
2. Flow – Multiply the water evaporator flow by the Flow correction factor from
Table 7 through Table 10 to determine the increased evaporator flow due to glycol.
If the flow is unknown, it can be calculated from the following equation:
)(24
×
=
CapacitykW
elta
−×=18.4
For Metric Applications
(gpm) Flow Glycol FactorCorrectionFlow
– Use the following equation for metric applications:
(l/s) Flow Glycol
3. Pressure drop -- Multiply the water pressure drop from page 22 by Pressure Drop
correction factor from Table 7 through Table 10. High concentrations of propylene
glycol at low temperatures may cause unacceptably high pressure drops.
4. Power -- Multiply the water system power by Power correction factor from Table 7
through T able 10.
glycolCapacityTons
TDelta
−
×
×
FactorCorrectionFlow
)
IOMM AGZ-5 AGZ 026B through 130B 17
Test coolant with a clean, accurate glycol solution hydrometer (similar to that found in
service stations) to determine the freezing point. Obtain percent glycol from the
freezing point table below. It is recommended that a minimum of 25% solution by
weight be used for protection against corrosion or that additional compatible inhibitors
be added.
Concentrations above 35 percent do not provide any additional burst protection and
should be carefully considered before using.
CAUTION
Do not use an automotive grade antifreeze. Industrial grade glycols must be used.
Automotive antifreeze contains inhibitors which will cause plating on the copper tubes
within the chiller evaporator. The type and handling of glycol used must be consistent
with local codes.
Table 7, Ethylene Glycol Factors for Models AGZ 026B to 070B
% E.G.
10 26 -3.3 0.998 0.998 1.036 1.097
20 18 -7.8 0.993 0.997 1.060 1.226
30 7 -13.9 0.987 0.995 1.092 1.369
40 -7 -21.7 0.980 0.992 1.132 1.557
50
Freeze Point
o
F
-28 -33.3 0.973 0.991 1.182 1.791
o
C
Capacity Power Flow PD
Table 8, Propylene Glycol Factors for Models AGZ 026B to 070B
% P.G.
10 26 -3.3 0.995 0.997 1.016 1.100
20 19 -7.2 0.987 0.995 1.032 1.211
30 9 -12.8 0.978 0.992 1.057 1.380
40 -5 -20.6 0.964 0.987 1.092 1.703
50
Freeze Point
o
F
-27 -32.8 0.952 0.983 1.140 2.251
o
C
Capacity Power Flow PD
Table 9, Ethylene Glycol Factors for Models AGZ 075B to 130B
% E.G.
10 26 -3.3 0.994 0.998 1.038 1.101
20 18 -7.8 0.982 0.995 1.063 1.224
30 7 -13.9 0.970 0.992 1.095 1.358
40 -7 -21.7 0.955 0.987 1.134 1.536
50
Freeze Point
o
F
-28 -33.3 0.939 0.983 1.184 1.755
o
C
Capacity Power Flow PD
Table 10, Propylene Glycol Factors for Models AGZ 075B to 130B
% P.G.
10 26 -3.3 0.988 0.996 1.019 1.097
20 19 -7.2 0.972 0.992 1.035 1.201
30 9 -12.8 0.951 0.987 1.059 1.351
40 -5 -20.6 0.926 0.979 1.095 1.598
50
Freeze Point
o
F
-27 -32.8 0.906 0.974 1.142 2.039
o
C
Capacity Power Flow PD
18 AGZ 026B through 130B IOMM AGZ-5
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. For performance at elevations other than sea level, refer to Table 11 or Table 12.
Evaporator Temperature Drop Factors
Performance tables are based on a 10°F (5°C) temperature drop through the evaporator. Adjustment
factors for applications with temperature ranges from 6°F to 16°F (3.3°C to 8.9°C) are in Table 11 or
Table 12.
Temperature drops outside this 6°F to 16°F (3.3°C to 8.9°C) range can affect the control system's
capability to maintain acceptable control and are not recommended.
The maximum water temperature that can be circulated through the evaporator in a non-operating
mode is 100°F (37.8°C).
Fouling Factor
Performance tables are based on water with a fouling factor of
As fouling is increased, performance decreases. For performance at other than 0.0001 (0.0176)
fouling factor, refer to Table 11 or Table 12.
Foreign matter in the chilled water system will adversely affect the heat transfer capability of
the evaporator and could increase the pressure drop and reduce the water flow. Maintain
proper water treatment to provide optimum unit operation.
22
)/0176.0(/0001.0
kWCmorBTUFhrft °×°×× per ARI 550/590-98.
Table 11, Capaci t y and Power Derates, Models AGZ 026 to 070
Fouling Factor
Altitude
Sea
Level
2000 feet
4000 feet
6000 feet
Chilled Water Delta T
°F °C Cap. Power Cap. Power Cap. Power Cap. Power
6 3.3 0.978 0.993 0.975 0.991 0.963 0.987 0.940 0.980
8 4.4 0.989 0.996 0.986 0.994 0.973 0.990 0.950 0.983
10 5.6 1.000 1.000 0.996 0.999 0.984 0.994 0.961 0.987
12 6.7 1.009 1.003 1.005 1.001 0.993 0.997 0.969 0.990
14 7.7 1.018 1.004 1.014 1.003 1.002 0.999 0.978 0.991
16 8.9 1.025 1.007 1.021 1.006 1.009 1.001 0.985 0.994
6 3.3 0.977 1.001 0.973 1.000 0.961 0.996 0.938 0.989
8 4.4 0.987 1.006 0.984 1.004 0.971 1.000 0.948 0.993
10 5.6 0.998 1.009 0.995 1.007 0.982 1.003 0.959 0.996
12 6.7 1.007 1.011 1.004 1.010 0.991 1.006 0.967 0.998
14 7.7 1.014 1.014 1.011 1.013 0.998 1.009 0.974 1.001
16 8.9 1.022 1.016 1.018 1.014 1.005 1.010 0.981 1.003
6 3.3 0.973 1.011 0.970 1.010 0.957 1.006 0.935 0.998
8 4.4 0.984 1.014 0.980 1.013 0.968 1.009 0.945 1.001
10 5.6 0.995 1.019 0.991 1.017 0.979 1.013 0.955 1.005
12 6.7 1.004 1.021 1.000 1.020 0.987 1.016 0.964 1.008
14 7.7 1.011 1.024 1.007 1.023 0.994 1.018 0.971 1.011
16 8.9 1.018 1.027 1.014 1.026 1.002 1.021 0.978 1.014
6 3.3 0.969 1.021 0.966 1.020 0.954 1.016 0.931 1.008
8 4.4 0.980 1.026 0.977 1.024 0.964 1.020 0.942 1.013
10 5.6 0.989 1.029 0.986 1.027 0.973 1.023 0.950 1.015
12 6.7 0.998 1.033 0.995 1.031 0.982 1.027 0.959 1.020
14 7.7 1.007 1.036 1.004 1.034 0.991 1.030 0.967 1.022
16 8.9 1.014 1.037 1.011 1.036 0.998 1.031 0.974 1.024
0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)
IOMM AGZ-5 AGZ 026B through 130B 19
Table 12, Capacity and Power Derates, Models AGZ 075 to 130
Fouling Factor
Altitude
Sea
Level
2000 feet
4000 feet
6000 feet
8000 feet
Chilled Water
Delta T
°F °C Cap. Power Cap. Power Cap. Power Cap. Power
6 3.3 0.990 0.997 0.976 0.994 0.937 0.983 0.868 0.964
8 4.4 0.994 0.998 0.981 0.995 0.942 0.984 0.872 0.965
10 5.6 1.000 1.000 0.987 0.996 0.947 0.986 0.877 0.967
12 6.7 1.005 1.001 0.991 0.997 0.951 0.986 0.881 0.968
14 7.7 1.009 1.002 0.995 0.998 0.955 0.987 0.884 0.968
16 8.9 1.013 1.004 1.000 1.000 0.960 0.989 0.889 0.970
6 3.3 0.987 1.005 0.974 1.002 0.934 0.991 0.865 0.972
8 4.4 0.992 1.006 0.979 1.003 0.940 0.992 0.870 0.973
10 5.6 0.997 1.008 0.984 1.004 0.944 0.994 0.875 0.975
12 6.7 1.002 1.009 0.989 1.005 0.949 0.994 0.879 0.975
14 7.7 1.007 1.011 0.993 1.007 0.953 0.996 0.883 0.977
16 8.9 1.011 1.012 0.998 1.008 0.958 0.997 0.887 0.978
6 3.3 0.985 1.014 0.972 1.010 0.933 0.999 0.864 0.980
8 4.4 0.991 1.015 0.977 1.012 0.938 1.001 0.869 0.981
10 5.6 0.995 1.016 0.982 1.013 0.943 1.002 0.873 0.982
12 6.7 1.000 1.018 0.987 1.014 0.947 1.003 0.877 0.984
14 6.8 1.005 1.019 0.991 1.015 0.951 1.004 0.881 0.985
16 8.9 1.009 1.021 0.995 1.017 0.955 1.006 0.884 0.987
6 3.3 0.982 1.023 0.969 1.020 0.930 1.009 0.861 0.989
8 4.4 0.988 1.025 0.975 1.022 0.935 1.010 0.866 0.991
10 5.6 0.992 1.026 0.979 1.022 0.940 1.011 0.870 0.992
12 6.7 0.997 1.028 0.984 1.024 0.944 1.013 0.875 0.994
14 7.7 1.002 1.029 0.989 1.025 0.949 1.014 0.879 0.995
16 8.9 1.006 1.031 0.992 1.027 0.952 1.016 0.882 0.996
6 3.3 0.979 1.034 0.966 1.031 0.927 1.019 0.859 1.000
8 4.4 0.984 1.036 0.971 1.032 0.932 1.021 0.863 1.002
10 5.6 0.990 1.037 0.976 1.033 0.937 1.022 0.868 1.002
12 6.7 0.993 1.039 0.980 1.035 0.941 1.024 0.871 1.004
14 7.7 0.998 1.041 0.985 1.037 0.945 1.026 0.875 1.006
16 8.9 1.003 1.041 0.990 1.038 0.950 1.026 0.879 1.007
0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)
Evaporator Freeze Protection
Evaporator freeze-up can be a concern in the application of air-cooled water chillers.
To protect against freeze-up, insulation and an electric heater cable are furnished with
the unit. This protects the evaporator down to -20°F (-29°C) ambient air temperature.
Although the evaporator is equipped with freeze protection, it does not protect water
piping external to the unit or the evaporator itself if there is a power failure or heater
cable burnout. Consider the following recommendations for additional protection.
1. If the unit will not be operated during the winter, drain evaporator and chilled
water piping and flush with glycol. Drain and vent connections are provided on the
evaporator to ease draining.
2. Add a glycol solution to the chilled water system to provide freeze protection.
Freeze point should be approximately ten degrees below minimum design ambient
temperature.
3. The addition of thermostatically controlled heat and insulation to exposed piping.
4. Continuous circulation of water through the chilled water piping and evaporator.
20 AGZ 026B through 130B IOMM AGZ-5
The evaporator heater cable is factory wired to the 115-volt circuit in the control box.
This power should be supplied from a separate source, but it can be supplied from the
control circuit. Operation of the heater cable is automatic through the ambient sensing
thermostat that energizes the evaporator heater cable for protection against freeze-up.
Unless the evaporator is drained in the winter, the disconnect switch to the evaporator
heater must not be open.
Evaporator Flow and Pressure Drop
Evaporator flow rate must fall between the minimum and maximum values shown in
the evaporator pressure drop table on the following page.
IOMM AGZ-5 AGZ 026B through 130B 21
Figure 19, AGZ 026B – 130B, Evaporator Pressure Drop
040
045
050
055
026-030
035
065-070
075-085-090
120-130
060
100-110
AGZ Unit
Model
026B 41 1.6 2.6 4.7 65 3.9 4.1 11.6 109 10.4 6.9 30.9
030B 45 1.9 2.9 5.7 72 4.7 4.6 14.1 121 12.7 7.6 37.8
035B 50 1.9 3.1 5.6 80 4.6 5.0 13.8 133 12.4 8.4 36.9
040B 58 1.9 3.6 5.7 92 4.7 5.8 14.0 154 12.6 9.7 37.5
045B 64 1.8 4.0 5.4 102 4.5 6.4 13.4 170 12.1 10.7 35.9
050B 71 1.8 4.4 5.4 113 4.5 7.1 13.3 188 12.0 11.9 35.7
055B 78 1.8 4.9 5.3 125 4.4 7.9 13.0 209 11.7 13.2 34.8
060B 86 1.7 5.4 5.2 137 4.3 8.6 12.8 228 11.5 14.4 34.2
065B 92 1.6 5.8 4.9 147 4.1 9.3 12.1 246 10.9 15.5 32.5
070B 98 1.9 6.2 5.6 157 4.6 9.9 13.7 262 12.3 16.5 36.8
075B 111 5.6 7.0 16.5 177 12.5 11.2 37.4 295 30.4 18.6 90.7
085B 119 6.3 7.5 18.9 191 14.3 12.1 42.7 318 34.8 20.1 103.6
090B 128 7.2 8.1 21.4 205 16.2 12.9 48.4 342 39.4 21.6 117.3
100B 146 2.6 9.2 7.7 234 6.1 14.8 18.2 390 15.5 24.6 46.2
110B 161 3.1 10.2 9.2 258 7.3 16.3 21.7 430 18.5 27.1 55.1
120B 180 3.5 11.3 10.4 288 8.9 18.1 26.5 479 24.6 30.2 73.4
130B 194 4.1 12.2 12.1 311 10.4 19.6 30.9 518 28.7 32.7 85.6
NOTE: Minimum and maximum flows are established to ensure the Delta-T for each unit size falls within the 6 - 16°F range for
Inch-Pound S.I. Inch-Pound S.I. Inch-Pound S.I.
gpm DP ft. lps DP kpa gpm DP ft. lps DP kpa gpm DP ft. lps DP kpa
proper unit control.
Minimum Nominal Maximum
22 AGZ 026B through 130B IOMM AGZ-5
Wind Baffles and Hail Guards
G
A
Wind Baffles/Hail Guards are a field installed option that are used to stabilize unit operation
in high wind areas and to assist in operation at low ambient temperatures. Figure 20 is a
sketch of a typical panel assembly on an AGZ unit. The actual number of panels and parts
will vary by model size. The parts are shown in the table below and referenced by balloon
numbers.
Figure 20, Installation Sequence
Rib Att achment (First)
RIB FLANGES ON THE END
MUST POINT TO CENTER
OF COIL TO HAVE A FINISHED
LOOK. INTERIOR RIB FLANGES
CAN POINT IN ANY DIRECTION.
U
I
I
R
E
N
T
T
C
V
O
I
L
C
L
A
Front Panel Attachment (Second)
PLACE FRONT "A" AND
FASTEN TO BOTH SIDES
C
O
L
I
C
I
A
L
V
E
R
U
2
T
N
T
I
C
B
A
ATTACH ALL RIBS TO
COIL VERTICAL CHANNELS.
E
D
PLACE FRONT "B" BY LAPPIN
OVER "A" AND REPEAT
ATTACHMENT PROCEDURE.
1
Top Panel Attachment (Last)
ATTACH TOP "A" AT HORIZONTAL COIL CHANNEL FIRST.
IOMM AGZ-5 AGZ 026B through 130B 23
THIS WILL SQ UA RE THE P AN EL .
OVERLAP THE FRONT PANEL FLANGE.
3
E
D
L
I
C
O
L
C
A
R
E
I
T
T
V
I
U
N
B
A
C
ATTACH LEFT SIDE SECOND.
LAP PANEL "B" OVER PANEL "A"
ND REPEAT ATTACHMENT PR OCEDURE.
Table 13, Packing List
L
O
t
Description Part Number Bubble Number
Vertical Support Rib 074758501 1
Top Cover 330409401 2
¼ - 20 x ½” Screw (Place in Poly Bag) 046093807
Front Panel 330409501 3
Figure 21, Components
Top Panel, Install Last
Overlap the Front panel
T
REAR (AGAINST UNIT)
VERTICAL SUPPORT RIB TOP COVER FRONT PANE
P
Front Panel, Install Second
Rib, Install Firs
24 AGZ 026B through 130B IOMM AGZ-5
Optional Features
Controls
Hot Gas Bypass
Hot gas bypass permits unit operation down to 10% of full load capacity. This option
includes a factory-mounted hot gas bypass valve, solenoid valve, and manual shutoff
valve for each circuit. See page 93 for further information.
Head Pressure Control
Optional fan VFD control allows unit operation down to 0°F (-18°C). (Not available
on 380 volt, 60 Hertz units.)
Water Flow Switch
(P/N 017503300) A water flow switch is available for field installation in the chilled
water piping to avoid evaporator freeze-up under low or no flow conditions. Terminals
are provided in the unit control center for field hook-up of the water flow switch. If
this option is not ordered with the unit, then a field supplied water flow switch must be
installed.
Alarm Bell
Bell for field installation and wiring to the control panel to provide remote indication
of unit alarm condition. See Field Wiring Diagram for connection locations.
BAS Interface (Protocol Selectability
)
Connection to Chiller
Connection to the chiller for all building automation systems (BAS) protocols will be
at the unit controller. An interface card, depending on the protocol being used, may
have been factory-installed in the unit controller (or it can be field installed).
Protocols Supported
Table 14, Standard Protocol Data
Protocol Physical Layer Data Rate Controller Other
BACnet/IP or
BACnet/Ethernet
BACnet MSTP RS-485
LONWORKS
Modbus RTU RS-485 or RS-232
Ethernet 10 Base-T 10 Megabits/sec
9600, 19200 or
38400 bits/sec
FTT-10A 78kbits/sec
9600 or 19200
bits/sec
MicroTech II
MicroTech II
MicroTech II
MicroTech II
Reference ED 15062
Reference ED 15062
Reference ED 15062
Reference ED 15063
The interface kits on the MicroTech II controller are as follows:
• BACnet Kit P/N 350147404: BACnet/IP, BACnet MS/TP, or BACnet Ethernet
• LONWORKS Kit P/N 350147401: LonTalk (FTT-10A)
• Modbus: Modbus RTU
The following functions are available through the BAS where possible. Exact
capabilities may vary depending on the protocol in use.
• Enable/Disable chiller operation by setting the Unit Enable setpoint.
• Select the operating mode by setting the Unit Mode setpoint.
• Set the Cool LWT and Ice LWT setpoints.
• Set the Network Limit variable.
• Read Enable/Disable status of chiller
• Read current operating mode and status (state) of chiller.
• Read a description of each alarm when it occurs.
IOMM AGZ-5 AGZ 026B through 130B 25
Reference documents ED 15062 and ED 15063 may be obtained from the local
McQuay sales office, from the local McQuayService office, or from the McQuay
Technical Response Center, located in Staunton, Virginia (540-248-0711).
These documents can also be found on www.mcquay.com
(chiller type) > Control Integration.
The following are trademarks or registered trademarks of their respective
companies: BACnet from the American Society of Heating, Refrigerating and AirConditioning Engineers, Inc., LonTalk, LONMARK and LONWORKS from Echelon
Corporation, and Modbus and Modbus RTU from Schneider Electric.
under Product Information >
Unit
Vibration Isolators
Spring vibration isolators are available for field installation to reduce vibration
transmission through the unit base. See page 12 for detailed information on their
installation.
Protective Base Guards
Optional factory-installed, vinyl-coated welded wire base guards provide all-around
lower unit protection on ground level installations. Coil guards are standard.
Copper Fin Condenser Coils
Copper fin condenser coils are available as an option on all models.
Black Fin Coils
Aluminum fin stock precoated with a phenolic coating with 1000 hour salt spray
resistance (ASTM B117-90).
Coated Fins
Copper or aluminum fins coated with ElectroFin baked epoxy protective coating with
3000+ hour salt spray resistance (ASTM B117-90).
Evaporator Insulation
Double insulation thickness (total of 1½ inches) for high humidity areas or low fluid
temperatures.
Sound Reduction
Acoustical blankets are factory-installed on each compressor.
Hail and Wind Guards
A field-mounted option that is shipped as a kit including panels, fasteners, and
instructions. See page 23 for further information.
Shut-off Valves
Factory-mounted suction and discharge shut-off valves, liquid line shutoff valve is
standard.
Electrical
Multi-Point Electrical Connection
Provides a power connection to each of the unit’s two electrical circuits.
Disconnect Switch with Through-the-Door Handle
A factory or field-installed option for service use, nonfused disconnect switch
(mounted inside the power section of the control box) with a through-the-door handle
is available with single and multi-point power supply.
26 AGZ 026B through 130B IOMM AGZ-5
Phase Loss/Voltage Protection
Phase loss with under/over voltage protection and multiple LED indication of fault
type is available as a factory-installed option to guard against compressor motor
burnout.
Convenience Outlet
10.0 amp, 115-volt outlet located in control panel to provide power for servicing unit.
Ground Fault Protection
Protects equipment from damage from line-to-ground fault currents less than those
required for conductor protection.
High Short Circuit Current Protection
Provides control panel protection against short circuit currents per the following table:
Voltage 208 240 460 600
Current (kA) 120 100 65 25
High Ambient Control Panel
Consists of exhaust fan with rain hood, two inlet screens with filters, necessary
controls and wiring to allow operation to 125°F. The option can be factory or field
installed as a kit. Must be used for:
• Ambient temperatures above 105°F (40°C) with fan VFD (low ambient option)
• Ambient temperatures above 115°F (46°C) with standard FanTrol control.
IOMM AGZ-5 AGZ 026B through 130B 27
Physical Data
AGZ-BS
Table 15, AGZ 026BS through 035BS
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI (1), Tons (kW) 27. 2 (95. 4) 30.2 (106.3) 33.2 (117.2)
Number Of Refrigerant Circuits 2 2 2
Unit Operating Charge, R-22, Lbs. 22 22 22 27 27 27
Unit Operating Charge, R-22, (kg) 10 10 10 12 12 12
Cabinet Dimensions, LxWxH, In. 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4
Cabinet Dimensions, LxWxH, (mm) 2398 x 2235 x 2550 2398 x 2235 x 2550 2398 x 2235 x 2550
Unit Operating Weight, Lb (kg) 3990 (1811) 4040 (1834) 4080 (1852)
Unit Shipping Wei ght, Lb (kg) 39501793) 3990 (1811) 4030 (1830)
Add'l Weight If Copper Finned Coils, Lb (kg) 284 (129) 284 (129) 284 (129)
COMPRESSORS
Type Tandem Scrolls Tandem Scrolls Tandem Scrolls
Nominal tonnage of each Com pressor 7. 5 7.5 7.5 9.0 9.0 9. 0
Number Of Compressors per Circuit 2 2 2 2 2 2
Oil Charge Per Compressor, Oz. 140 140 140 140 140 140
Oil Charge Per Compressor, (g) (496) (496) (496) (496) (496) (496)
CAPACITY REDUCTION STEPS - PERCE NT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead 0-25-50-75-100 0-23-50-73-100 0-25-50-75-100
Staging, 4 Stages, Circuit #2 in Lead 0-25-50-75-100 0-27-50-77-100 0-25-50-75-100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area Sq. Ft. 26.3 26.3 26.3 26.3 26.3 26.3
Coil Face Area, (M2) 2.4 2.4 2.4 2.4 2.4 2.4
Finned Height x Finned Length, In. 50x75.6 50x75.6 50x75.6 50x75.6 50x75.6 50x75.6
Finned Height x Finned Length, (mm)
Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3
Pumpdown Capacity, 90% Full Lbs . (kg) 49 (22) 49 (22) 49 (22) 49 (22) 49 (22) 49 (22)
Maximum Relief Valve Pressure Setting,
psig (kPa)
CONDENSER FANS - DIRECT DRIVE PROPELL ER TYPE
Number Of Fans - Fan Diameter, In. (mm) 4 – 30 (762) 4 – 30 (762) 4 – 30 (762)
Number Of Motors - HP (kW) (2) 4 – 1.5 4 – 1.5 4 – 1.5
Fan And Motor RPM, 60Hz 1140 1140 1140
60 Hz Fan Tip Speed, FPM (M/Sec) 8950 (4224) 8950 (4224) 8950 (4224)
60 Hz Total Unit Airflow, CFM (M3/sec) 24,316 (11,478) 24,316 (11,478) 24,316 (11,478)
EVAPORATOR - BRAZED PLATE-TO-PLATE
Number of Evaporators 1 1 1
Number of Refrigerant Circuits 2 2 2
Water Volume, Gallons, (L) 4.3 (16.4) 5.0 (18.9) 5.7 (21.4)
Maximum Water P ressure, psig (kPa) 363 (2503) 363 (2503) 363 (2503)
Max. Refrig. Working Pressure, psig (kPa) 450 (3102) 450 (3102) 450 (3102)
Water Inlet / Outlet Victaulic Conn. In. (mm) 3 (76) 3 (76) 3 (76)
Drain - NPT int, In. (mm) Field Field Field
Vent - NPT int, In. (mm) Field Fiel d Field
NOTES:
1. Nominal capacity bas ed on 95° F ambient air and 54°F/44°F water range.
2. Except for 380V/60 & 575V /60, HP = 2.0
AGZ MODEL NUMBER
026B 030B 035B
Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
28 AGZ 026B through 130B IOMM AGZ-5
Table 16, AGZ 040BS through 055BS
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW) 38.5 (135.5) 42. 5 (149.6) 47.0 (165.4) 52.2 (183. 7)
Number Of Refrigerant Circuits 2 2 2 2
Unit Operating Charge, R-22, lbs. 31 31 38 38 38 38 46 46
Unit Operating Charge, R-22, (kg) (14) (14) (17) (17) (17) (17) (21) (21)
Cabinet Dimensions, LxWxH, in. 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lbs. (kg) 4130 (1875) 4270 (1939) 4400 (1998) 4540 (2061)
Unit Shipping Wei ght, Lbs. (kg) 4070 (1848) 4210 (1911) 4330 (1966) 4460 (2025)
Add'l Weight If Copper Finned Coils, lbs. (kg) 288 (130) 288 (130) 476 (216) 476 (216)
COMPRESSORS
Type Tandem Scrolls Tandem Scrolls Tandem Scrol l s Tandem Scrolls
Nominal tonnage of each Compressor 10.0 10.0 10.0 13.0 13.0 13.0 15.0 15.0
Number Of Compressors per Ci rcuit 2 2 2 2 2 2 2 2
Oil Charge Per Compressor, oz. 140 140 140 140 140 140 140 140
Oil Charge Per Compressor, (g) (496) (496) (496) (496) (496) (496) (496) (496)
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead 0-25-50-75-100 0-22-50-46-100 0-25-50-75-100 0-25-50-75-100
Staging, 4 Stages, Circuit #2 in Lead 0-25-50-75-100 0-28-50-85-100 0-25-50-75-100 0-25-50-75-100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, sq. ft. 44.1 44.1 44.1 44.1 44.1 44.1 44.1 44.1
Coil Face Area , sq. m 4.1 4.1 4.1 4.1 4.1 4.1 4.1 4.1
Finned Height x Finned Length, in. 42x75.6 42x75.6 42x75.6 42x75.6 42x75.6 42x75.6 42x75.6 42x75.6
Finned Height x Finned Length, (mm)
Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 2 16 x 2 16 x 3 16 x 3 16 x 3 16 x 3
Pumpdown Capacity, 90% Full Lbs . (kg) 60 (27) 60 (27) 60(27) 60(27) 82 (37) 82 (37) 82 (37) 82 (37)
Maximum Relief Valve Pressure Setting, psig (kPa)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, in. (mm) 4 – 30 (762) 4 – 30 (762) 4 – 30 (762) 4 – 30 (762)
Number Of Motors - HP (kW) (2) 4 – 1.5 4 – 1.5 4 – 1.5 4 – 1.5
Fan And Motor RPM, 60Hz 1140 1140 1140 1140
60 Hz Fan Tip Speed, FPM (m/sec) 8950 (4224) 8950 (4224) 8950 (4224) 8950 (4224)
60 Hz Total Unit Airflow, CFM (m3/sec) 39,600 (18,692) 39,600 (18,692) 39,600 (18,692) 39,600 (18, 692)
EVAPORATOR - BRAZED PLATE-TO-PLATE
Number of Evaporators 1 1 1 1
Number of Refrigerant Circuits 2 2 2 2
Water Volume, Gallons, (L) 6.3 (23.9) 7.2 (27.3) 8.1 (30.7) 9.2 (34.9)
Maximum Water P ressure, psig (kPa) 363 (2503) 363 (2503) 363 (2503) 363 (2503)
Maximum Refrigerant Working Pressure, psig (k Pa) 450 (3102) 450 (3102) 450 (3102) 450 (3102)
Water Inlet / Outlet Victaulic Connections, in. (mm) 3 (76) 3 (76) 3 (76) 3 (76)
Drain - NPT int, in. (mm ) Field Field Field Field
Vent - NPT int, in. (mm) Field Field Field Field
NOTES:
1. Nominal capacity based on 95°F ambient air and 54°F/44°F water range.
2. Except for 380V/60 & 575V/60, HP = 2.0
040B 045B 050B 055B
Ckt.1 Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.2
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1067 x
1920
450
(3103)
AGZ MODEL NUMBER
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1067 x
1920
450
(3103)
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1067 x
1920
(3103)
450
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1067 x
1920
(3103)
450
IOMM AGZ-5 AGZ 026B through 130B 29
Table 17, AGZ 060BS through 070BS
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW) 57.1 (201.0) 61.4 (215.5) 65. 5 (230. 0)
Number Of Refrigerant Circuits 2 2 2
Unit Operating Charge, R-22, lbs. 46 46 52 59 59 59
Unit Operating Charge, R-22, (kg) (21) (21) (24) (27) (27) (27)
Cabinet Dimensions, LxWxH, in. 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lbs. (kg) 4600 4860 4990
Unit Shipping Wei ght, Lbs. (kg) 4520 4760 4890
Add'l Weight If Copper Finned Coils, lbs. (kg) 476 (216) 568 (258) 568 (258)
COMPRESSORS
Type Tandem Scrolls Tandem Scrolls Tandem Sc rol l s
Nominal tonnage of each Com pressor 15.0 15.0 15.0 15 / 20 15 / 20 15 / 20
Number Of Compressors per Circuit 2 2 2 2 2 2
Oil Charge Per Compressor, oz. 140 140 140 140 /148 140 /148 140 /148
Oil Charge Per Compressor, (g) (496) (496) (496) 496/ 525 496/ 525 496/ 525
CAPACITY REDUCTION STEPS - PERCE NT OF COMPRESSOR DISPL ACEMENT
Staging, 4 Stages, Circuit #1 in Lead 0-25-50-75-100 0-23-46-77-100 0-25-50-75-100
Staging, 4 Stages, Circuit #2 in Lead 0-25-50-75-100 0-31-46-69-100 0-25-50-75-100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, sq. ft. 44.1 44.1 52.6 52.6 52.6 52.6
Coil Face Area, (m2) 4.1 4.1 4.9 4.9 4.9 4.9
Finned Height x Finned Length, in. 42x75.6 42x75.6 50x75.6 50x75.6 50x75.6 50x75.6
Finned Height x Finned Length, (mm)
Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3
Pumpdown Capacity, 90% Full Lbs . (kg) 82 (37) 82 (37) 98 (44) 98 (44) 98 (44) 98 (44)
Maximum Relief Valve Pressure Setting, psig (kPa)
CONDENSER FANS - DIRECT DRIVE PROPELL E R TYPE
Number Of Fans - Fan Diameter, in. (mm) 4 – 30 (762) 4 – 30 (762) 4 – 30 (762)
Number Of Motors - HP (kW) (2) 4 – 1.5 4 – 2.0 4 – 2.0
Fan And Motor RPM, 60Hz 1140 1140 1140
60 Hz Fan Tip Speed, FPM (m/sec) 8950 (4224) 8950 (4224) 8950 (4224)
60 Hz Total Unit Airflow, CFM (m3/sec) 37,228 (17,572 43,452 (20,510) 43,452 (20,510)
EVAPORATOR - BRAZED PLATE-TO-PLATE
Number of Evaporators 1 1 1
Number of Refrigerant Circuits 2 2 2
Water Volume, Gallons, (L) 9.2 (34.9) 11.2 (42.5) 11.2 (42.5)
Maximum Water P ressure, psig (kPa) 363 (2503) 363 (2503) 363 (2503)
Maximum Refrigerant Working Pressure, psig (k Pa) 450 (3102) 450 (3102) 450 (3102)
Water Inlet / Outlet Victaulic Connections, in. (mm) 3 (76) 3 (76) 3 (76)
Drain - NPT int, in. (mm ) Field Field Field
Vent - NPT int, in. (mm) Field Field Field
NOTES:
1. Nominal capacity based on 95°F ambient air and 54° F/ 44° F water range.
2. Except for 380V/60 & 575V/60 for AGZ 060, HP = 2.0
060B 065B 070B
Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2
2398 x 2235 x
2550
1067 x
1920
450
(3103)
AGZ MODEL NUMBER
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
2398 x 2235 x
2550
1270 x
1920
450
(3103)
1270 x
1920
(3103)
450
30 AGZ 026B through 130B IOMM AGZ-5
Table 18, AGZ 075BS through 090BS
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW) 73.7 (259.4) 79.6 (280.2) 85.5 (301.0)
Number Of Refrigerant Circuits 2 2 2
Unit Operating Charge, R-22, lbs. 59 59 59 69 69 69
Unit Operating Charge, R-22, (kg) (27) (27) (27 (31) (31) (31)
Cabinet Dimensions, LxWxH, in. 134.9 x 88.0 x 100.4 134.9 x 88.0 x 100.4 134.9 x 88.0 x 100.4
Cabinet Dimensions, LxWxH, (mm) 3426 x 2235 x 2550 3426 x 2235 x 2550 3426 x 2235 x 2550
Unit Operating Weight, Lbs. (kg) 6530 (2958) 6690 (3031) 6850 (3103)
Unit Shipping Wei ght, Lbs. (kg) 6320 (2863) 6480 (2935) 6640 (3008)
Add'l Weight If Copper Finned Coils, lbs. (kg) 870 (395) 870 (395) 870 (395)
COMPRESSORS
Type Tandem Scrolls Tandem Scrolls Tandem Scrolls
Nominal tonnage of each Com pressor 20.0 20.0 20.0 25.0 25.0 25.0
Number Of Compressors per Ci rcuit 2 2 2 2 2 2
Oil Charge Per Compressor, oz. 148 148 148 200 200 200
Oil Charge Per Compressor, (g) (525) (525) (525) (709) (709) (709)
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead 0-25-50-75-100 0-22-50-72-100 0-25-50-75-100
Staging, 4 Stages, Circuit #2 in Lead 0-25-50-75-100 0-28-50-78-100 0-25-50-75-100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, sq. ft. 78.8 78.8 78.8 78.8 78.8 78.8
Coil Face Area, (m2) 7.3 7.3 7.3 7.3 7.3 7.3
Finned Height x Finned Length, in. 50 x113.4 50 x113.4 50 x113.4 50 x113.4 50 x113.4 50 x113.4
Finned Height x Finned Length, (mm)
Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3
Pumpdown Capacity, 90% Full Lbs . (kg) 147 (67) 147 (67) 147 (67) 147 (67) 147 (67) 147 (67)
Maximum Relief Valve Pressure Setting, psig (kPa)
CONDENSER FANS - DIRECT DRIVE PROPELL ER TYPE
Number Of Fans - Fan Diameter, in. (mm) 6 – 30 (762) 6 – 30 (762) 6 – 30 (762)
Number Of Motors - HP (kW) 6 – 2.0 6 – 2.0 6 – 2.0
Fan And Motor RPM, 60Hz 1140 1140 1140
60 Hz Fan Tip Speed, FPM (m/sec) 8950 (4224) 8950 (4224) 8950 (4224)
60 Hz Total Unit Airflow, CFM (m3/sec) 65,178 (30,765) 65,178 (30,765) 65,178 (30,765)
EVAPORATOR - SHELL AND TUBE
Number of Evaporators 1 1 1
Number of Refrigerant Circuits 2 2 2
Diameter, in. - Length, ft. 14.0 x 5.2 14.0 x 5.2 14.0 x 5.2
Diameter, (mm) – Length, (mm) 356 x 1585 356 x 1585 356 x 1585
Water Volume, Gallons, (L) 25 (95) 25 (95) 25 (95)
Maximum Water P ressure, psig (kPa) 152 (1047) 152 (1047) 152 (1047)
Maximum Refrigerant Working Pressure, psig (k Pa) 300 (2066) 300 (2066) 300 (2066)
Water Inlet / Outlet Victaulic Connections, in. (mm) 5 (127) 5 (127) 5 (127)
Drain - NPT int, in. (mm) 0.5 (12.7) 0.5 (12.7) 0.5 (12.7)
Vent - NPT int, in. (m m) 0.5 (12.7) 0.5 (12.7) 0.5 (12.7)
NOTE:
1. Nominal capacity bas ed on 95° F ambient air and 54°F/44°F water range.
075B 085B 090B
Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2
1270 x
2880
450
(3103)
AGZ MODEL NUMBER
1270 x
2880
450
(3103)
1270 x
2880
450
(3103)
1270 x
2880
450
(3103)
1270 x
2880
450
(3103)
1270 x
2880
450
(3103)
IOMM AGZ-5 AGZ 026B through 130B 31
Table 5, AGZ 100BS through 130BS
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW) 97.6 (342.6) 107.5 (378. 4) 119.8 (421.7) 129.4 (455.5)
Number Of Refrigerant Circuits 2 2 2 2
Unit Operating Charge, R-22, lbs. 76 86 86 86 86 104 104 104
Unit Operating Charge, R-22, (kg) (35) (39) (39) (39) (39) (47) (47) (47)
Cabinet Dimensions, LxWxH, in. 173.1 x 88.0 x 100.4 173.1 x 88.0 x 100.4 173.1 x 88.0 x 100.4 173.1 x 88.0 x 100.4
Cabinet Dimensions, LxWxH, (mm) 4397 x 2235 x 2550 4397 x 2235 x 2550 4397 x 2235 x 2550 4397 x 2235 x 2550
Unit Operating Weight, Lbs. (kg) 7870 (3565) 8150 (3692) 8720 (3950) 9050 (4100)
Unit Shipping Wei ght, Lbs. (kg) 7580 (3434) 7860 (3561) 8380 (3796) 8710 (3946)
Add'l Weight If Copper Finned Coils, lbs. (kg) 1155 (524) 1155 (524) 1155 (524) 1155 (524)
COMPRESSORS
Type Trio Scrolls Trio Scrolls Trio Scrolls Trio Scrolls
Nominal tonnage of each Compressor 15.0 20.0 20.0 20.0 20.0 25.0 25.0 25.0
Number Of Compressors per Ci rcuit 3 3 3 3 3 3 3 3
Oil Charge Per Compressor, oz. 140 148 148 148 148 200 200 200
Oil Charge Per Compressor, (g) (496) (525) (525) (525) (525) (709) (709) (709)
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 6 Stages, Circuit #1 in Lead 0-14-33-48-67-81-100 0-17-33-50-67-83-100 0-15-33-48-67-81-100 0-17-33-50-67-83-100
Staging, 6 Stages, Circuit #2 in Lead 0-19-33-52-67-86-100 0-17-33-50-67-83-100 0-19-33-52-67-86-100 0-17-33-50-67-83-100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, sq. ft. 105.3 105.3 105.3 105.3 105.3 105.3 105.3 105.3
Coil Face Area, (m2) 9.8 9.8 9.8 9.8 9.8 9.8 9.8 9.8
Finned Height x Finned Length, in. 50 x151.6 50 x151.6 50 x151.6 50 x151.6 50 x151.6 50 x151.6 50 x151.6 50 x151.6
Finned Height x Finned Length, (mm)
Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3
Pumpdown Capacity, 90% Full Lbs . (kg) 196 (89) 196 (89) 196 (89) 196 (89) 196 (89) 196 (89) 196 (89) 196 (89)
Maximum Relief Valve Press ure Setting, psig
(kPa)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, in. (mm) 8 – 30 (762) 8 – 30 (762) 8 – 30 (762) 8 – 30 (762)
Number Of Motors - HP (kW) 8 – 2.0 8 – 2.0 8 – 2.0 8 – 2.0
Fan And Motor RPM, 60Hz 1140 1140 1140 1140
60 Hz Fan Tip Speed, FPM (m/sec) 8950 (4224) 8950 (4224) 8950 (4224) 8950 (4224)
60 Hz Total Unit Airflow, CFM (m3/sec) 86,904 (41,020) 86,904 (41,020) 86,904 (41,020) 86,904 (41,020)
EVAPORATOR - SHELL AND TUBE
Number of Evaporators 1 1 1 1,
Number of Refrigerant Circuits 2 2 2 2
Diameter, in. - Length, ft. 12.8 x 7.9 12.8 x 7.9 14.0 x 8.0 14.0 x 8.0
Diameter, (mm) – Length, (mm) 324 x 2408 324 x 2408 356 x 2438 356 x 2438
Water Volume, Gallons, (L) 34 (127) 34 (127) 40 (150) 40 (150)
Maximum Water P ressure, psig (kPa) 152 (1047) 152 (1047) 152 (1047) 152 (1047)
Maximum Refrigerant Working Pressure, psig
(kPa)
Water Inlet / Outlet Victaulic Connections, in.
(mm)
Drain - NPT int, in. (mm) 0.5 (12.7) 0.5 (12.7) 0.5 (12.7) 0.5 (12.7)
Vent - NPT int, in. (m m) 0.5 (12.7) 0.5 (12.7) 0.5 (12.7) 0.5 (12.7)
100B 110B 120B 130B
Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2
1270 x
3851
450
(3103)
1270 x
3851
450
(3103)
300 (2066) 300 (2066) 300 (2066) 300 (2066)
5 (127) 5 (127) 5 (127) 5 (127)
1270 x
(3103)
AGZ MODEL NUMBER
3851
450
1270 x
3851
450
(3103)
1270 x
3851
450
(3103)
1270 x
3851
450
(3103)
1270 x
3851
450
(3103)
1270 x
3851
450
(3103)
NOTE:
1. Nominal capacity based on 95°F ambient air and 54°F/44° F water range.
32 AGZ 026B through 130B IOMM AGZ-5
Electrical Data - Standard Ambient
Table 19, AGZ 026BM/BS – 070BM/BS, Electrical Data, Single Point
(105°F & below)
AGZ Unit
Size
026B
030B
035B
040B
045B
050B
055B
060B
065B
070B
NOTES:
1. Units operating in am bi ent temperatures of 95°F (35°C) and above must use the
2. All Elect ri cal Data notes are on page 49.
3. Conduit hubs are not provided.
Volts
Maximum Fuse or HACR Breaker si ze.
Minimum
Circuit
Ampacity
(MCA)
208 133 3 1/0 150 150
230 126 3 #1 150 150
380 80 3 #4 90 90
460 68 3 #4 80 80
575 52 3 #6 60 60
208 146 3 1/0 175 175
230 143 3 1/0 175 175
380 88 3 #3 100 100
460 74 3 #4 80 90
575 58 3 #6 70 70
208 158 3 2/0 175 175
230 150 3 1/0 175 175
380 96 3 #3 110 110
460 79 3 #4 90 90
575 64 3 #6 70 70
208 167 3 2/0 200 200
230 167 3 2/0 200 200
380 113 3 #2 125 125
460 81 3 #4 90 90
575 70 3 #4 80 80
208 184 3 3/0 225 225
230 184 3 3/0 225 225
380 121 3 #1 125 125
460 94 3 #3 110 110
575 78 3 #4 90 90
208 199 3 3/0 225 225
230 199 3 3/0 225 225
380 127 3 #1 150 150
460 104 3 #2 125 125
575 86 3 #3 100 100
208 221 3 4/0 250 250
230 214 3 4/0 250 250
380 145 3 1/0 175 175
460 108 3 #2 125 125
575 96 3 #3 110 110
208 248 3 250 300 300
230 228 3 4/0 250 250
380 156 3 2/0 175 175
460 112 3 #2 150 150
575 105 3 #2 125 125
208 281 3 300 350 350
230 281 3 300 350 350
380 162 3 2/0 200 200
460 124 3 #1 150 150
575 109 3 #2 125 125
208 301 3 350 350 350
230 301 3 350 350 350
380 168 3 2/0 200 200
460 130 3 #1 150 150
575 112 3 #2 125 125
Power Supply
Field Wire
Quantity
Wire
Gauge
75C
Recomm’d.
Fuse
Or HACR
Breaker
Size
Max. Fuse
Or HACR
Breaker
Size
IOMM AGZ-5 AGZ 026B through 130B 33
Table 20, AGZ 026BM/BS – 070BM/BS, Compressor and Fan Motor Amps, Single and
Multi-Point (Up to 105°F)
AGZ
Unit
Volts
Size
026B
030B
035B
040B
045B
050B
055B
060B
065B
070B
All Electrical Dat a notes are on page 49.
No. 1 No. 3 No. 5 No. 2 No. 4 No. 6
208 25.7 25.7 - 25.7 25.7 - 5.8 4 23.3 189 189 - 189 189 230 24.2 24.2 - 24.2 24.2 - 5.8 4 26.1 189 189 - 189 189 380 14.9 14.9 - 14.9 14.9 - 4.1 4 20.0 112 112 - 112 112 460 13.4 13.4 - 13.4 13.4 - 2.8 4 13.0 99 99 - 99 99 575 9.3 9.3 - 9.3 9.3 - 3.0 4 14.0 74 74 - 74 74 -
208 25.7 25.7 - 31.8 31.8 - 5.8 4 23.3 189 189 - 232 232 230 24.2 24.2 - 31.8 31.8 - 5.8 4 26.1 189 189 - 232 232 380 14.9 14.9 - 18.6 18.6 - 4.1 4 20.0 112 112 - 144 144 460 13.4 13.4 - 16.0 16.0 - 2.8 4 13.0 99 99 - 125 125 575 9.3 9.3 - 12.2 12.2 - 3.0 4 14.0 74 74 - 100 100 -
208 31.8 31.8 - 31.8 31.8 - 5.8 4 23.3 232 232 - 232 232 230 29.9 29.9 - 29.9 29.9 - 5.8 4 26.1 232 232 - 232 232 380 18.6 18.6 - 18.6 18.6 - 4.1 4 20.0 144 144 - 144 144 460 16.0 16.0 - 16.0 16.0 - 2.8 4 13.0 125 125 - 125 125 575 12.2 12.2 - 12.2 12.2 - 3.0 4 14.0 100 100 - 100 100 -
208 33.8 33.8 - 33.8 33.8 - 5.8 4 23.3 278 278 - 278 278 230 33.8 33.8 - 33.8 33.8 - 5.8 4 26.1 278 278 - 278 278 380 22.8 22.8 - 22.8 22.8 - 4.1 4 20.0 151 151 - 151 151 460 16.5 16.5 - 16.5 16.5 - 2.8 4 13.0 127 127 - 127 127 575 13.7 13.7 - 13.7 13.7 - 3.0 4 14.0 100 100 - 100 100 -
208 33.8 33.8 - 41.4 41.4 - 5.8 4 23.3 278 278 - 350 350 230 33.8 33.8 - 41.4 41.4 - 5.8 4 26.1 278 278 - 350 350 380 22.8 22.8 - 26.0 26.0 - 4.1 4 20.0 151 151 - 195 195 460 16.5 16.5 - 21.8 21.8 - 2.8 4 13.0 127 127 - 158 158 575 13.7 13.7 - 17.3 17.3 - 3.0 4 14.0 100 100 - 125 125 -
208 41.4 41.4 - 41.4 41.4 - 5.8 4 23.3 350 350 - 350 350 230 41.4 41.4 - 41.4 41.4 - 5.8 4 26.1 350 350 - 350 350 380 26.0 26.0 - 26.0 26.0 - 4.1 4 20.0 195 195 - 195 195 460 21.8 21.8 - 21.8 21.8 - 2.8 4 13.0 158 158 - 158 158 575 17.3 17.3 - 17.3 17.3 - 3.0 4 14.0 125 125 - 125 125 -
208 41.0 41.0 - 51.3 51.3 - 5.8 4 23.3 350 350 - 425 425 230 41.0 41.0 - 48.1 48.1 - 5.8 4 26.1 350 350 - 425 425 380 26.0 26.0 - 33.8 33.8 - 4.1 4 20.0 195 195 - 239 239 460 21.8 21.8 - 23.7 23.7 - 2.8 4 13.0 158 158 - 187 187 575 17.3 17.3 - 21.8 21.8 - 3.0 4 14.0 125 125 - 148 148 -
208 52.8 52.8 - 52.8 52.8 - 5.8 4 23.3 425 425 - 425 425 230 48.1 48.1 - 48.1 48.1 - 5.8 4 26.1 425 425 - 425 425 380 32.7 32.7 - 32.7 32.7 - 4.1 4 20.0 239 239 - 239 239 460 23.7 23.7 - 23.7 23.7 - 2.8 4 13.0 187 187 - 187 187 575 21.8 21.8 - 21.8 21.8 - 3.0 4 14.0 148 148 - 148 148 -
208 52.8 52.8 - 52.8 73.1 - 7.8 4 31.7 425 425 - 425 505 230 52.8 52.8 - 52.8 73.1 - 7.8 4 35.6 425 425 - 425 505 380 32.7 32.7 - 32.7 38.2 - 4.1 4 20.0 239 239 - 239 280 460 23.7 23.7 - 23.7 30.1 - 3.6 4 17.8 187 187 - 187 225 575 21.8 21.8 - 21.8 25.2 - 3.0 4 14.0 148 148 - 148 180 -
208 52.8 73.1 - 52.8 73.1 - 7.8 4 31.7 425 505 - 425 505 230 52.8 73.1 - 52.8 73.1 - 7.8 4 35.6 425 505 - 425 505 380 32.7 38.2 - 32.7 38.2 - 4.1 4 20.0 239 280 - 239 280 460 23.7 30.1 - 23.7 30.1 - 3.6 4 17.8 187 225 - 187 225 575 21.8 25.2 - 21.8 25.2 - 3.0 4 14.0 148 180 - 148 180 -
Rated Load Amps Locked Rotor Amps
Compressors Compressors
F.L.Amps
Fan
Motors
(Each)
No. Of
Fan
Motors
Fan
Motors
(Each)
Across-The-Line
No.1 No. 3 No. 5 No.2 No.4 No. 6
34 AGZ 026B through 130B IOMM AGZ-5
Table 21, AGZ 026 BM/BS – 070BM/BS, Field Wiring, Single Point
Wiring to Standard
Amps
Power Block
Connector Wire
Range
(Copper Wire Only)
AGZ
Unit
Size
026B
030B
035B
040B
045B
050B
055B
060B
065B
070B
All Electrical Dat a notes are on page 49.
Volts
208 175 14 GA – 2/0 225 # 4 - 300 kcmil
230 175 14 GA – 2/0 225 # 4 - 300 kcmil
380 175 14 GA – 2/0 150 # 4 - 300 kcmil
460 175 14 GA – 2/0 150 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
208 380 #4 – 500kc mil 225 # 4 - 300 kcmil
230 380 #4 – 500kc mil 225 # 4 - 300 kcmil
380 175 14 GA – 2/0 150 # 4 - 300 kcmil
460 175 14 GA – 2/0 150 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
208 380 #4 – 500kc mil 225 # 4 - 300 kcmil
230 380 #4 – 500kc mil 225 # 4 - 300 kcmil
380 175 14 GA – 2/0 150 # 4 - 300 kcmil
460 175 14 GA – 2/0 150 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
208 380 #4 – 500kc mil 225 # 4 - 300 kcmil
230 380 #4 – 500kc mil 225 # 4 - 300 kcmil
380 175 14 GA – 2/0 150 # 4 - 300 kcmil
460 175 14 GA – 2/0 150 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
208 380 #4 – 500kc mil 225 # 4 - 300 kcmil
230 380 #4 – 500kc mil 225 # 4 - 300 kcmil
380 175 14 GA – 2/0 150 # 4 - 300 kcmil
460 175 14 GA – 2/0 150 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
208 380 #4 – 500kc mil 250 #6 - 350 kcmi l
230 380 #4 – 500kc mil 250 #6 - 350 kcmi l
380 175 14 GA – 2/0 150 # 4 - 300 kcmil
460 175 14 GA – 2/0 150 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
208 380 #4 – 500kc mil 400 250 kcmil -500 kcmil
230 380 #4 – 500kc mil 400 250 kcmil -500 kcmil
380 175 14 GA – 2/0 250 #6 - 350 kcmil
460 175 14 GA – 2/0 150 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
208 380 #4 – 500kc mil 400 250 kcmil -500 kcmil
230 380 #4 – 500kc mil 400 250 kcmil -500 kcmil
380 380 #4 – 500kc mil 250 #6 - 350 kcmi l
460 175 14 GA – 2/0 150 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
208 380 #4 – 500kc mil 400 250 kcmil -500 kcmil
230 380 #4 – 500kc mil 400 250 kcmil -500 kcmil
380 380 #4 – 500kc mil 250 #6 - 350 kcmi l
460 175 14 GA – 2/0 250 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
208 380 #4 – 500kc mil 400 250 kcmil -500 kcmil
230 380 #4 – 500kc mil 400 250 kcmil -500 kcmil
380 380 #4 – 500kc mil 250 #6 - 350 kcmi l
460 380 #4 – 500kc mil 250 # 4 - 300 kcmil
575 175 14 GA – 2/0 150 # 4 - 300 kcmil
Terminal
Disconnect
Wiring to Optional
Non-Fused Disconnect Switch
Connector Wire
Size
Range
(Copper Wire Only)
IOMM AGZ-5 AGZ 026B through 130B 35
Table 22, AGZ 075BM/BS – 130BM/BS, Electrical Wiring, Single Point
(Up to 105°F)
AGZ Unit
Size
075B
085B
090B
100B
110B
120B
130B
NOTES:
1. Units operating in ambient tem peratures of 95°F (35°C) and above m ust use the Maximum
2. All Electrical Data notes are on page 49.
3. (2) indicates that two conduits are requi red.
4. Conduit hubs are not supplied.
Volts
Fuse or HACR Breaker size.
Minimum
Circuit
Ampacity
(MCA)
208 358 6 4/0 400 400
230 358 6 4/0 400 400
380 187 3 3/0 225 225
460 150 3 1/0 175 175
575 125 3 #1 150 150
208 380 6 250 450 450
230 380 6 250 450 450
380 219 3 250 250 250
460 171 3 2/0 200 200
575 136 3 1/0 150 150
208 414 6 300 500 500
230 414 6 300 500 500
380 248 3 250 300 300
460 188 3 3/0 225 225
575 146 3 1/0 175 175
208 463 6 350 500 500
230 463 6 300 500 500
380 260 3 300 300 300
460 199 3 3/0 225 225
575 171 3 2/0 175 175
208 528 6 - (2) 300 600 600
230 528 6 - (2) 300 600 600
380 282 3 300 300 300
460 220 3 4/0 250 250
575 182 3 3/0 200 200
208 613 6 - (2) 350 700 700
230 613 6 - (2) 350 700 700
380 323 3 400 350 350
460 248 3 250 250 250
575 198 3 3/0 225 225
208 613 6 - (2) 350 700 700
230 613 6 - (2) 350 700 700
380 361 6 4/0 400 400
460 273 3 300 300 300
575 212 3 4/0 225 225
Power Supply M ax. Fuse
Field Wire
Quantity
Wire
Gauge
75C
Recomm’d.
Fuse
Or HACR
Breaker
Size
Or HACR
Breaker
Size
36 AGZ 026B through 130B IOMM AGZ-5
Table 23, AGZ 075BM/BS – 130BM/BS, Compressor and Fan Motor Amps, Single and
Multi-Point (Up to 105°F)
Rated Load Amps Locked Rotor Amps
AGZ
Unit
Volts
Size
075B
085B
090B
100B
110B
120B
130B
All Electrical Dat a notes are on page 49.
No. 1 No. 3 No. 5 No. 2 No. 4 No. 6
208 73.1 73.1 - 73.1 73.1 - 7.8 6 31.7 505 505 - 505 505 230 73.1 73.1 - 73.1 73.1 - 7.8 6 35.6 505 505 - 505 505 380 38.2 38.2 - 38.2 38.2 - 4.1 6 20.0 280 280 - 280 280 460 30.1 30.1 - 30.1 30.1 - 3.6 6 17.8 225 225 - 225 225 575 25.2 25.2 - 25.2 25.2 - 3.0 6 14.0 180 180 - 180 180 -
208 73.1 73.1 - 83.3 83.3 - 7.8 6 31.7 505 505 - 500 500 230 73.1 73.1 - 83.3 83.3 - 7.8 6 35.6 505 505 - 500 500 380 38.2 38.2 - 52.5 52.5 - 4.1 6 20.0 280 280 - 305 305 460 30.1 30.1 - 39.0 39.0 - 3.6 6 17.8 225 225 - 250 250 575 25.2 25.2 - 30.0 30.0 - 3.0 6 14.0 180 180 - 198 198 -
208 86.4 86.4 - 86.4 86.4 - 7.8 6 31.7 500 500 - 500 500 230 86.4 86.4 - 86.4 86.4 - 7.8 6 35.6 500 500 - 500 500 380 52.5 52.5 - 52.5 52.5 - 4.1 6 20.0 305 305 - 305 305 460 39.0 39.0 - 39.0 39.0 - 3.6 6 17.8 250 250 - 250 250 575 30.0 30.0 - 30.0 30.0 - 3.0 6 14.0 198 198 - 198 198 -
208 52.8 52.8 52.8 74.5 74.5 74.5 7.8 8 31.7 425 425 425 505 505 505
230 52.8 52.8 52.8 74.5 74.5 74.5 7.8 8 35.6 425 425 425 505 505 505
380 32.7 32.7 32.7 39.8 39.8 39.8 4.1 8 20.0 239 239 239 280 280 280
460 23.7 23.7 23.7 30.6 30.6 30.6 3.6 8 17.8 187 187 187 225 225 225
575 21.8 21.8 21.8 25.2 25.2 25.2 3.0 8 14.0 148 148 148 180 180 180
208 74.5 74.5 74.5 74.5 74.5 74.5 7.8 8 31.7 505 505 505 505 505 505
230 74.5 74.5 74.5 74.5 74.5 74.5 7.8 8 35.6 505 505 505 505 505 505
380 39.8 39.8 39.8 39.8 39.8 39.8 4.1 8 20.0 280 280 280 280 280 280
460 30.6 30.6 30.6 30.6 30.6 30.6 3.6 8 17.8 225 225 225 225 225 225
575 25.2 25.2 25.2 25.2 25.2 25.2 3.0 8 14.0 180 180 180 180 180 180
208 87.9 87.9 87.9 88.0 88.0 88.0 7.8 8 31.7 505 505 505 500 500 500
230 87.9 87.9 87.9 88.0 88.0 88.0 7.8 8 35.6 505 505 505 500 500 500
380 39.8 39.8 39.8 52.5 52.5 52.5 4.1 8 20.0 280 280 280 305 305 305
460 30.6 30.6 30.6 39.0 39.0 39.0 3.6 8 17.8 225 225 225 250 250 250
575 25.2 25.2 25.2 30.0 30.0 30.0 3.0 8 14.0 180 180 180 198 198 198
208 88.0 88.0 88.0 88.0 88.0 88.0 7.8 8 31.7 500 500 500 500 500 500
230 88.0 88.0 88.0 88.0 88.0 88.0 7.8 8 35.6 500 500 500 500 500 500
380 52.5 52.5 52.5 52.5 52.5 52.5 4.1 8 20.0 305 305 305 305 305 305
460 39.0 39.0 39.0 39.0 39.0 39.0 3.6 8 17.8 250 250 250 250 250 250
575 30.0 30.0 30.0 30.0 30.0 30.0 3.0 8 14.0 198 198 198 198 198 198
Compressors Compressors
F.L.
Amps
Fan
Motors
(Each)
No. Of
Fan
Motors
Fan
Motors
(Each)
Across-The-Line
No.1 No. 3 No. 5 No.2 No.4 No. 6
IOMM AGZ-5 AGZ 026B through 130B 37
Table 24, AGZ 075BM/BS - 130BM/BS, Field Wiring, Single Point
Wiring to Standard
Amps
Power Block
Connector Wire
(Copper Wire Only)
AGZ
Unit
Size
075B
085B
090B
100B
110B
120B
130B
All Electrical Dat a notes are on page 49.
Volts
208 760 2 GA – 500kcmil 600 (2) 250 kcmil -500 kcm i l
230 760 2 GA – 500kcmil 600 (2) 250 kcmil -500 kcm i l
380 380 #4 – 500kcmil 250 #6 - 350 kcmil
460 380 #4 – 500kcmil 250 #6 - 350 kcmil
575 380 #4 – 500kcmil 250 #6 - 350 kcmil
208 760 2 GA – 500kcmil 600 (2) 250 k cmil -500 kcmil
230 760 2 GA – 500kcmil 600 (2) 250 k cmil -500 kcmil
380 380 #4 – 500kc mil 400 250 kc mil -500 kcmil
460 380 #4 – 500kc mil 250 #6 - 350 kcmil
575 380 #4 – 500kc mil 250 #6 - 350 kcmil
208 760 2 GA – 500kcmil 600 (2) 250 k cmil -500 kcmil
230 760 2 GA – 500kcmil 600 (2) 250 k cmil -500 kcmil
380 380 #4 – 500kc mil 400 250 kc mil -500 kcmil
460 380 #4 – 500kc mil 250 #6 - 350 kcmil
575 380 #4 – 500kc mil 250 #6 - 350 kcmil
208 760 2 GA – 500kcmil 600 (2) 250 k cmil -500 kcmil
230 760 2 GA – 500kcmil 600 (2) 250 k cmil -500 kcmil
380 380 #4 – 500kc mil 400 250 kc mil -500 kcmil
460 380 #4 – 500kc mil 400 250 kc mil -500 kcmil
575 380 #4 – 500kc mil 250 #6 - 350 kcmil
208 760 2 GA – 500kcmil 800 (2) 250 k cmil -500 kcmil
230 760 2 GA – 500kcmil 800 (2) 250 k cmil -500 kcmil
380 380 #4 – 500kc mil 400 250 kc mil -500 kcmil
460 380 #4 – 500kc mil 400 (2) 3/0-250 kcmil
575 380 #4 – 500kc mil 400 (2) 3/0-250 kcmil
208 760 2 GA – 500kcmil 800 (2) 250 k cmil -500 kcmil
230 760 2 GA – 500kcmil 800 (2) 250 k cmil -500 kcmil
380 380 #4 – 500kc mil 400 250 kc mil -500 kcmil
460 380 #4 – 500kc mil 400 250 kc mil -500 kcmil
575 380 #4 – 500kc mil 400 (2) 3/0-250 kcmil
208 760 2 GA – 500kcmil 800 (2) 250 k cmil -500 kcmil
230 760 2 GA – 500kcmil 800 (2) 250 k cmil -500 kcmil
380 760 2 GA – 500kcmil 600 (2) 3/0-250 kcmil
460 380 #4 – 500kc mil 400 250 kc mil -500 kcmil
575 380 #4 – 500kc mil 400 (2) 3/0-250 kcmil
Terminal
Range
Disconnect
Wiring to Optional
Non-Fused Disconnect Switch
Size
Connector Wire Range
(Copper Wire Only)
38 AGZ 026B through 130B IOMM AGZ-5
Table 25, AGZ 026BM/BS – 070BM/BS, Electrical Data, Multi- Point (Up to 105°F)
Electrical Circuit #1 Electrical Circuit #2
Max.
Fuse
or HACR
Breaker
Size
Wire
Gauge
Recomm’d
Fuse
or HACR
Breaker
Size
Max. Fuse
or HACR
Breaker
Size
Minimum
Circuit
Ampacity
(MCA)
Qty
Gauge
AGZ
Unit
Size
026B
030B
035B
040B
045B
Minimum
Volts
230 66 3 #4 80 90 66 3 #4 80 90
380 42 3 #8 50 50 42 3 #8 50 50
460 36 3 #8 45 45 36 3 #8 45 45
575 27 3 #10 35 35 27 3 #10 35 35
230 66 3 #4 80 90 83 3 #4 100 100
380 42 3 #8 50 50 50 3 #8 60 60
460 36 3 #8 45 45 42 3 #8 50 50
575 27 3 #10 35 35 34 3 #10 40 45
230 79 3 #4 100 100 79 3 #4 100 100
380 50 3 #8 60 60 50 3 #8 60 60
460 42 3 #8 50 50 42 3 #8 50 50
575 34 3 #10 40 45 34 3 #10 40 45
230 88 3 #3 110 100 88 3 #3 110 100
380 60 3 #6 70 80 60 3 #6 70 80
460 43 3 #8 50 50 43 3 #8 50 50
575 37 3 #8 45 50 37 3 #8 45 50
230 88 3 #3 110 110 105 3 #2 125 125
380 60 3 #6 70 80 67 3 #4 80 80
460 43 3 #8 50 50 55 3 #6 70 70
575 37 3 #8 45 50 45 3 #8 50 60
Circuit
Ampacity
(MCA)
Power Supply Power Supply
Field Wire Field Wire
Qty
Wire
Recomm’d
Fuse
or HACR
Breaker
Size
230 105 3 #2 125 125 105 3 #2 125 125
380 67 3 #4 80 80 67 3 #4 80 80
050B
460 55 3 #6 70 70 55 3 #6 70 70
575 45 3 #8 50 60 45 3 #8 50 60
230 105 3 #2 125 125 120 3 #1 150 150
380 67 3 #4 80 80 82 3 #3 100 110
055B
460 55 3 #6 70 70 59 3 #6 70 80
575 45 3 #8 50 60 55 3 #6 70 70
230 120 3 #1 150 150 120 3 #1 150 150
380 82 3 #3 100 110 82 3 #3 100 110
060B
460 59 3 #6 70 80 59 3 #6 70 80
575 55 3 #6 70 70 55 3 #6 70 70
230 135 3 1/0 175 175 160 3 2/0 200 225
380 82 3 #4 100 110 89 3 #3 110 125
065B
460 61 3 #6 70 80 69 3 #4 90 100
575 55 3 #6 70 70 59 3 #6 70 80
230 160 3 2/0 200 225 160 3 2/0 200 225
380 89 3 #3 110 125 89 3 #3 110 125
070B
460 69 3 #4 90 100 69 3 #4 90 100
575 59 3 #6 70 80 59 3 #6 70 80
NOTES:
1. All Electrical Data notes are on page 49.
2. Conduit hubs are not supplied.
IOMM AGZ-5 AGZ 026B through 130B 39
Table 26, AGZ 026BM/BS - 070BM/BS, Field Wiring, Multi- Poi nt
Wiring to Standard
AGZ
Unit
Size
026B
030B
035B
040B
045B
050B
055B
060B
Volts
230
380
460
575
230
380
460
575
230
380
460
575
230
380
460
575
230
380
460
575
230
380
460
575
230
380
460
575
230
380
460
575
Power Block
Terminal
Amps
Cir #1 Cir #2 Cir #1 Cir #2 Cir #1 Cir #2 Cir #1 Cir #2
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
175
Connector Wire Range
(Copper Wire Only)
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
Disconnect Size
Non-Fused Disconnect Switch
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
Wiring to Optional
Connector Wire Range
(Copper Wire Only)
-
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
-
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
-
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
-
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
-
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
-
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
-
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
-
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
-
-
-
-
-
-
-
-
230
065B
070B
All Electrical Dat a notes are on page 49.
380
460
575
230
380
460
575
380
175
175
175
380
175
175
175
40 AGZ 026B through 130B IOMM AGZ-5
#4 – 500 kcmil #4 – 500 kcmil 225
380
175
175
175
380
175
175
175
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
#4 – 500 kcmil #4 – 500 kcmil 225
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
14 GA – 2/0 14 GA – 2/0 150
#4 – 300 kcmil #4 – 300 kcmil
225
150
150
150
225
150
150
150
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#4 – 300 kcmil #4 – 300 kcmil
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
#14 - 1/0 #14 - 1/0
Table 27, AGZ 075BM/BS - 130BM/BS, Field Wiring Data
Wiring to Standard
AGZ
Unit
Size
075B
085B
090B
100B
110B
120B
130B
All Electrical Dat a notes are on page 49.
Volts
208 380 380 #4 –500 kcmil #4 –500 kcmil 250 250 #4 – 300 kcmil #4 –300 kcmil
230 380 380 #4 – 500 kcmil #4 – 500 kcmil 250 250 #4 – 300 kcmil #4 – 300 kcmil
380 175 175 14 GA – 2/0 14 GA – 2/0 250 250 #4 – 300 kcmil #4 – 300 kcmil
460 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
575 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
208 380 380 #4 –500 kcmil #4 –500 kcmil 250 250 #4 – 300 kcmil #4 –300 kcmil
230 380 380 #4 – 500 kcmil #4 – 500 kcmil 250 250 #4 – 300 kcmil #4 – 300 kcmil
380 175 175 14 GA – 2/0 14 GA – 2/0 250 250 #4 – 300 kcmil #4 – 300 kcmil
460 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
575 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
208 380 380 #4 –500 kcmil #4 –500 kcmil 250 250 #4 – 300 kcmil #4 –300 kcmil
230 380 380 #4 – 500 kcmil #4 – 500 kcmil 250 250 #4 – 300 kcmil #4 – 300 kcmil
380 175 175 14 GA – 2/0 14 GA – 2/0 250 250 #4 – 300 kcmil #4 – 300 kcmil
460 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
575 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
208 380 380 #4 –500 kcmil #4 –500 kcmil 250 400 #4 – 300 kcmil 250 –500 kcmil
230 380 380 #4 – 500 kcmil #4 – 500 kcmil 250 400 #4 – 300 kcmil 250 – 500 kcmil
380 175 175 14 GA – 2/0 14 GA – 2/0 150 250 #14 - 1/0 #4 – 300 kcmil
460 175 175 14 GA – 2/0 14 GA – 2/0 150 250 #14 - 1/0 #4 – 300 kcmil
575 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
208 380 380 #4 –500 kcmil #4 –500 kcmil 400 400 250 – 500 kcmil 250 –500 kcmil
230 380 380 #4 – 500 kcmil #4 – 500 kcmil 400 400 250 – 500 kcmil 250 – 500 k cmil
380 380 380 #4 – 500 kcmil #4 – 500 kcmil 250 250 #4 – 300 kcmil #4 – 300 kcmil
460 380 380 #4 – 500 kcmil #4 – 500 kcmil 250 250 #4 – 300 kcmil #4 – 300 kcmil
575 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
208 380 380 #4 –500 kcmil #4 –500 kcmil 400 400 250 – 500 kcmil 250 –500 kcmil
230 380 380 #4 – 500 kcmil #4 – 500 kcmil 400 400 250 – 500 kcmil 250 – 500 k cmil
380 380 380 #4 – 500 kcmil #4 – 500 kcmil 250 250 #4 – 300 kcmil #4 – 300 kcmil
460 380 380
575 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
208 380 380 #4 –500 kcmil #4 –500 kcmil 400 400 250 – 500 kcmil 250 –500 kcmil
230 380 380 #4 – 500 kcmil #4 – 500 kcmil 400 400 250 – 500 kcmil 250 – 500 k cmil
380 380 380 #4 – 500 kcmil #4 – 500 kcmil 250 250 #4 – 300 kcmil #4 – 300 kcmil
460 380 380 #4 – 500 kcmil #4 – 500 kcmil 250 250 #4 – 300 kcmil #4 – 300 kcmil
575 175 175 14 GA – 2/0 14 GA – 2/0 150 150 #14 - 1/0 #14 - 1/0
Terminal
Amps
Cir #1 Cir #2 Cir #1 Cir #2 Cir #1 Cir #2 Cir #1 Cir #2
Power Block
Connector Wire Range
(Copper Wire Only)
#4 – 500
#4 – 500 kcmil14 250 250 #4 – 300 kcmil #4 – 300 kcmil
Disconnect Size
Wiring to Optional
Non-Fused Disconnect Switch
Connector Wire Range
(Copper Wire Only)
IOMM AGZ-5 AGZ 026B through 130B 41
Table 28, AGZ 065BM/BS - 130BM/BS, Electrical Data, Multi -Point (Up to 105°F)
V
Electrical Circuit #1 Electrical Circuit #2
Power
AGZ
Unit
Size
075B
085B
090B
100B
110B
120B
130B
NOTES:
1. All Electrical Dat a notes are on page 49.
2. Conduit hubs are not supplied.
Minimum
olts
Circuit
Ampacity
(MCA)
208 188 3 3/0 225 250 188 3 3/0 225 250
230 188 3 3/0 225 250 188 3 3/0 225 250
380 98 3 #3 110 125 98 3 #3 110 125
460 79 3 #4 90 110 79 3 #4 90 110
575 66 3 #4 80 90 66 3 #4 80 90
208 188 3 3/0 225 250 218 3 4/0 250 300
230 188 3 3/0 225 250 218 3 4/0 250 250
380 98 3 #3 110 125 130 3 #1 150 175
460 79 3 #4 90 110 99 3 #3 125 125
575 66 3 #4 80 90 77 3 #4 90 100
208 218 3 4/0 250 300 218 3 4/0 250 300
230 218 3 4/0 250 250 218 3 4/0 250 250
380 130 3 #1 150 175 130 3 #1 150 175
460 99 3 #3 125 125 99 3 #3 125 125
575 77 3 #4 90 100 77 3 #4 90 100
208 203 3 4/0 250 250 273 3 300 300 300
230 203 3 3/0 225 225 273 3 300 300 300
380 123 3 #1 150 150 146 3 1/0 175 200
460 92 3 #3 110 110 114 3 #1 150 175
575 83 3 #4 100 100 94 3 #3 110 125
208 273 3 300 300 300 273 3 300 300 300
230 273 3 300 300 300 273 3 300 300 300
380 146 3 1/0 175 175 146 3 1/0 175 175
460 114 3 #1 125 125 114 3 #1 125 125
575 94 3 #3 110 110 94 3 #3 110 110
208 317 3 300 400 400 317 3 400 400 400
230 317 3 300 400 400 318 3 400 400 400
380 146 3 1/0 175 175 187 3 2/0 225 225
460 114 3 #1 125 125 141 3 1/0 175 175
575 94 3 #3 110 110 110 3 #2 125 125
208 317 3 400 400 400 317 3 400 400 400
230 318 3 400 400 400 318 3 400 400 400
380 187 3 2/0 225 225 187 3 2/0 225 225
460 141 3 1/0 175 175 141 3 1/0 175 175
575 110 3 #2 125 125 110 3 #2 125 125
Supply
Field Wire Field Wire
Gauge
Qty
Wire
75C
Recomm’d
Fuse
or HACR
Breaker
Size
Max. Fuse
or HACR
Breaker
Size
Minimum
Circuit
Ampacity
(MCA)
Power
Supply
Qty
Wire
Gauge
75C
Recomm’d
Fuse
or HACR
Breaker
Size
Max.
Fuse
or HACR
Breaker
Size
42 AGZ 026B through 130B IOMM AGZ-5
Electrical Data - High Ambient
Table 29, AGZ 026BB/BH – 070BB/BH, Electrical Data, Single Point
Power Supply
Field Wire
Quantity
AGZ Unit
Size
026B
030B
035B
040B
Minimum
Volts
230 133 3 1/0 150 150
380 80 3 #4 90 90
460 68 3 #4 80 80
575 53 3 #6 60 60
230 144 3 1/0 175 175
380 88 3 #3 100 100
460 74 3 #4 90 90
575 59 3 #6 70 70
230 155 3 2/0 175 175
380 96 3 #3 110 110
460 80 3 #4 90 90
575 64 3 #6 70 70
230 167 3 2/0 200 200
380 113 3 #2 125 125
460 84 3 #4 90 90
575 70 3 #4 80 80
Circuit
Ampacity
(MCA)
Wire
Gauge
75C
Recomm’d.
Fuse
Or HACR
Breaker
Size
Max. Fuse
Or HACR
Breaker
Size
230 188 3 3/0 225 225
045B
050B
055B
060B
065B
070B
NOTES:
1. Units operating in ambient tem peratures above 95°F (35° C) must us e the Maximum Fuse or
HACR Breaker size.
2. All Electrical Data notes are on page 49.
3. Conduit hubs are not provided.
380 123 3 #1 125 125
460 94 3 #3 110 110
575 78 3 #4 90 90
230 207 3 3/0 225 225
380 132 3 1/0 150 150
460 104 3 #2 125 125
575 86 3 #3 100 100
230 229 3 4/0 250 250
380 147 3 1/0 175 175
460 115 3 #2 125 125
575 96 3 #3 110 110
230 248 3 250 250 250
380 160 3 2/0 175 175
460 124 3 #1 150 150
575 105 3 #2 125 125
230 282 3 300 350 350
380 164 3 2/0 200 200
460 138 3 1/0 175 175
575 115 3 #2 125 125
230 304 3 350 350 350
380 172 3 2/0 200 200
460 150 3 1/0 175 175
575 123 3 #1 150 150
IOMM AGZ-5 AGZ 026B through 130B 43
Table 30, AGZ 026BB/BH – 070BB/BH, Compressor and Fan Motor Amps, Single and
Multi-Point (106°F to 125°F)
Rated Load Amps Locked Rotor Amps
AGZ
Unit
Volts
Size
026B
030B
035B
040B
045B
050B
055B
060B
065B
070B
All Electrical Dat a notes are on page 49.
No. 1 No. 3 No. 5 No. 2 No. 4 No. 6
230 25.7 25.7 - 25.7 25.7 - 5.8 4 26.1 189 189 - 189 189 380 14.9 14.9 - 14.9 14.9 - 4.1 4 20.0 112 112 - 112 112 460 13.4 13.4 - 13.4 13.4 - 2.8 4 13.0 99 99 - 99 99 575 9.5 9.5 - 9.5 9.5 - 3.0 4 14.0 74 74 - 74 74 -
230 25.7 25.7 - 30.9 30.9 - 5.8 4 26.1 189 189 - 232 232 380 14.9 14.9 - 18.6 18.6 - 4.1 4 20.0 112 112 - 144 144 460 13.4 13.4 - 16.2 16. 2 - 2.8 4 13.0 99 99 - 125 125 575 9.5 9.5 - 12.2 12.2 - 3.0 4 14.0 74 74 - 100 100 -
230 30.9 30.9 - 30.9 30.9 - 5.8 4 26.1 232 232 - 232 232 380 18.6 18.6 - 18.6 18.6 - 4.1 4 20.0 144 144 - 144 144 460 16.2 16.2 - 16.2 16.2 - 2.8 4 13.0 125 125 - 125 125 575 12.2 12.2 - 12.2 12.2 - 3.0 4 14.0 100 100 - 100 100 -
230 33.8 33.8 - 33.8 33.8 - 5.8 4 26.1 278 278 - 278 278 380 22.8 22.8 - 22.8 22.8 - 4.1 4 20.0 151 151 - 151 151 460 17.0 17.0 - 17.0 17.0 - 2.8 4 13.0 127 127 - 127 127 575 13.7 13.7 - 13.7 13.7 - 3.0 4 14.0 100 100 - 100 100 -
230 33.8 33.8 - 43.3 43.3 - 5.8 4 26.1 278 278 - 350 350 380 22.8 22.8 - 27.2 27.2 - 4.1 4 20.0 151 151 - 195 195 460 17.0 17.0 - 21.8 21.8 - 2.8 4 13.0 127 127 - 158 158 575 13.7 13.7 - 17.3 17.3 - 3.0 4 14.0 100 100 - 125 125 -
230 43.3 43.3 - 43.3 43.3 - 5.8 4 26.1 350 350 - 350 350 380 27.2 27.2 - 27.2 27.2 - 4.1 4 20.0 195 195 - 195 195 460 21.8 21.8 - 21.8 21.8 - 2.8 4 13.0 158 158 - 158 158 575 17.3 17.3 - 17.3 17.3 - 3.0 4 14.0 125 125 - 125 125 -
230 43.3 43.3 - 52.8 52.8 - 5.8 4 26.1 350 350 - 425 425 380 27.2 27.2 - 33.8 33.8 - 4.1 4 20.0 195 195 - 239 239 460 21.8 21.8 - 26.5 26.5 - 2.8 4 13.0 158 158 - 187 187 575 17.3 17.3 - 21.8 21.8 - 3.0 4 14.0 125 125 - 148 148 -
230 52.8 52.8 - 52.8 52.8 - 5.8 4 26.1 425 425 - 425 425 380 33.8 33.8 - 33.8 33.8 - 4.1 4 20.0 239 239 - 239 239 460 26.5 26.5 - 26.5 26.5 - 2.8 4 13.0 187 187 - 187 187 575 21.8 21.8 - 21.8 21.8 - 3.0 4 14.0 148 148 - 148 148 -
230 52.8 52.8 - 52.8 74.1 - 7.8 4 35.6 425 425 - 425 505 380 32.7 32.7 - 32.7 39.8 - 4.1 4 20.0 239 239 - 239 280 460 25.5 25.5 25.5 37.5 - 3.6 4 17.8 187 187 - 187 225 575 21.8 21.8 - 21.8 29.9 - 3.0 4 14.0 148 148 - 148 180 -
230 52.8 74.1 - 52.8 74.1 - 7.8 4 35.6 425 505 - 425 505 380 32.7 39.8 - 32.7 39.8 - 4.1 4 20.0 239 280 - 239 280 460 25.5 37.5 - 25.5 37.5 - 3.6 4 17.8 187 225 - 187 225 575 21.8 29.9 - 21.8 29.9 - 3.0 4 14.0 148 180 - 148 180 -
Compressors Compressors
-
-
-
-
-
-
-
-
-
-
F.L.Amps
Fan
Motors
(Each)
-
-
-
-
-
-
-
-
-
-
No.
of
Fan
Motors
R.L.Amps
Fan
Motors
(Each)
Across-The-Line
No.1 No. 3 No. 5 No.2 No. 4 No. 6
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
44 AGZ 026B through 130B IOMM AGZ-5
Table 31, AGZ 026BB/BH - 070BB/BH, Electrical Data, Multi -Point
(106°F to 125°F)
Electrical Circuit #1 Electrical Circuit #2
AGZ
Unit
Size
Volts
Minimum
Circuit
Ampacity
(MCA)
Power Supply Power Supply
Field Wire Field Wire
Qty
Wire
Gauge
75C
Recomm’d
Fuse
or HACR
Breaker
Size
Max. Fuse
or HACR
Breaker
Size
Minimum
Circuit
Ampacity
(MCA)
Qty
Wire
Gauge
75C
Recomm’d
Fuse
or HACR
Breaker
Size
Max.
Fuse
or HACR
Breaker
Size
230 70 3 #4 80 90
380 42 3 #8 50 50
026B
460 36 3 #8 45 45
575 27 3 #10 35 35
230 70 3 #4 80 90
380 42 3 #8 50 50
030B
460 36 3 #8 45 45
575 27 3 #10 35 35
230 81 3 #4 100 110
380 50 3 #8 60 60
035B
460 42 3 #8 50 50
575 34 3 #10 45 45
230 88 3 #3 110 110
380 60 3 #6 70 80
040B
460 44 3 #8 50 60
575 37 3 #8 45 50
230 88 3 #3 110 110
380 60 3 #6 70 80
045B
460 44 3 #8 50 60
575 37 3 #8 45 50
230 109 3 #2 125 150
380 70 3 #4 80 90
050B
460 55 3 #6 70 70
575 45 3 #8 60 60
70
40
36
27
81
50
42
34
81
50
42
34
88
60
44
37
109
70
55
45
109
70
55
45
#4 80 90
3
#8 50 50
3
#8 45 45
3
#10 35 35
3
#4 100 110
3
#8 60 60
3
#8 50 50
3
#10 45 45
3
#4 100 110
3
#8 60 60
3
#8 50 50
3
#10 45 45
3
#3 110 110
3
#6 70 80
3
#8 50 60
3
#8 45 50
3
#2 125 150
3
#4 80 90
3
#6 70 70
3
#8 60 60
3
#2 125 150
3
#4 80 90
3
#6 70 70
3
#8 60 60
3
230 109 3 #2 125 150
380 70 3 #4 80 90
055B
460 55 3 #6 70 70
575 45 3 #8 60 60
230 130 3 #1 175 175
380 84 3 #4 100 110
060B
460 65 3 #4 80 90
575 55 3 #6 70 70
230 134 3 1/0 175 175
380 82 3 #4 100 110
070B
460 67 3 #6 80 90
575 55 3 #6 70 70
NOTES:
1. All Electric al Data notes are on page 49.
2. Conduit hubs are not supplied.
130
84
65
55
130
84
65
55
161
91
80
65
#1 175 175
3
#4 100 110
3
#4 80 90
3
#6 70 70
3
#1 175 175
3
#4 100 110
3
#4 80 90
3
#6 70 70
3
2/0 200 225
3
#3 110 125
3
#4 100 110
3
#6 90 90
3
IOMM AGZ-5 AGZ 026B through 130B 45
Table 32, AGZ 075BB/BH – 130BB/BH, Electrical Data, Single Point
(Above 105°F)
Recomm’d.
Fuse
Or HACR
Breaker
Size
Or HACR
Breaker
Size
AGZ Unit
Size
Volts
Minimum
Circuit
Ampacity
(MCA)
Power Supply M ax. Fuse
Field Wire
Quantity
Wire
Gauge
75C
075B
085B
090B
100B
110B
120B
130B
NOTES:
1. Units operating in ambient tem peratures of 95° F (35°C) and above must use the Maximum
2. All Electrical Data notes are on page 49.
3. (2) in column with wire qty. indicates that two conduits are required.
4. Conduit hubs are not supplied.
230 362 6 4/0 400 400
380 194 3 3/0 225 225
460 187 3 3/0 225 225
575 145 3 1/0 175 175
230 382 6 250 450 450
380 234 3 250 250 250
460 200 3 4/0 225 225
575 151 3 1/0 175 175
230 401 6 350 450 450
380 270 3 300 300 300
460 211 3 4/0 250 250
575 157 3 2/0 175 175
230 462 6 350 500 500
380 273 3 300 300 300
460 230 3 4/0 250 250
575 187 3 3/0 200 200
-
230 526 6 - (2) 300 600 600
380 307 3 350 350 350
460 263 3 300 300 300
575 211 3 4/0 225 225
-
230 571 6 - (2) 350 600 600
380 352 6 - (2) 4/0 400 400
460 286 3 350 300 300
575 219 3 4/0 250 250
-
230 613 6 - (2) 350 700 700
380 393 6 250 450 450
460 307 3 350 350 350
575 228 3 250 250 250
Fuse or HACR Breaker size.
46 AGZ 026B through 130B IOMM AGZ-5
Table 33, AGZ 075BB/BH – 130BB/BH, Compressor and Fan Motor Amps, Single and
Multi-Point (106°F to 125°F)
AGZ
Unit
Volts
Size
075B
085B
090B
100B
110B
120B
130B
All Electrical Dat a notes are on page 49.
No. 1 No. 3 No. 5 No. 2 No. 4 No. 6
208 78.0 78.0 78.0 78.0 - 7.8 6 31.7 505 505 - 505 505 230 74.1 74.1 - 74.1 74.1 - 7.8 6 35.6 505 505 - 505 505 380 39.8 39.8 - 39.8 39.8 - 4.1 6 20.0 280 280 - 280 280 460 38.8 38.8 - 38.8 38.8 - 3.6 6 17.8 225 225 - 225 225 575 29.9 29.9 - 29.9 29.9 - 3.0 6 14.0 180 180 - 180 180 -
208 78.0 78.0 - 86.9 86.9 - 7.8 6 31.7 505 505 - 500 500 230 74.1 74.1 - 83.3 83.3 - 7.8 6 35.6 505 505 - 500 500 380 39.8 39.8 - 57.6 57.6 - 4.1 6 20.0 280 280 - 305 305 460 38.8 38.8 - 44.5 44.5 - 3.6 6 17.8 225 225 - 250 250 575 29.9 29.9 - 32.5 32.5 - 3.0 6 14.0 180 180 - 198 198 -
208 86.9 86.9 - 86.9 86.9 - 7.8 6 31.7 500 500 - 500 500 230 83.3 83.3 - 83.3 83.3 - 7.8 6 35.6 500 500 - 500 500 380 57.6 57.6 - 57.6 57.6 - 4.1 6 20.0 305 305 - 305 305 460 44.5 44.5 44.5 44.5 - 3.6 6 17.8 250 250 - 250 250 575 32.5 32.5 - 32.5 32.5 - 3.0 6 14.0 198 198 - 198 198 -
208 58.1 58.1 58.1 87.9 87.9 87.9 7.8 8 31.7 425 425 425 505 505 505
230 52.8 52.8 52.8 74.2 74.2 74.2 7.8 8 35.6 425 425 425 505 505 505
380 32.7 32.7 32.7 43.8 43.8 43.8 4.1 8 20.0 239 239 239 280 280 280
460 25.5 25.5 25.5 37.5 37.5 37.5 3.6 8 17.8 187 187 187 225 225 225
575 21.8 21.8 21.8 29.9 29.9 29.9 3.0 8 14.0 148 148 148 180 180 180
208 87.9 87.9 87.9 87.9 87.9 87.9 7.8 8 31.7 505 505 505 505 505 505
230 74.2 74.2 74.2 74.2 74.2 74.2 7.8 8 35.6 505 505 505 505 505 505
380 43.8 43.8 43.8 43.8 43.8 43.8 4.1 8 20.0 280 280 280 280 280 280
460 37.5 37.5 37.5 37.5 37.5 37.5 3.6 8 17.8 225 225 225 225 225 225
575 29.9 29.9 29.9 29.9 29.9 29.9 3.0 8 14.0 180 180 180 180 180 180
208 87.9 87.9 87.9 88.0 88.0 88.0 7.8 8 31.7 505 505 505 500 500 500
230 74.2 74.2 74.2 88.0 88.0 88.0 7.8 8 35.6 505 505 505 500 500 500
380 43.8 43.8 43.8 57.6 57.6 57.6 4.1 8 20.0 280 280 280 305 305 305
460 37.5 37.5 37.5 44.5 44.5 44.5 3.6 8 17.8 225 225 225 250 250 250
575 29.9 29.9 29.9 32.5 32.5 32.5 3.0 8 14.0 180 180 180 198 198 198
208 88.0 88.0 88.0 88.0 88.0 88.0 7.8 8 31.7 500 500 500 500 500 500
230 88.0 88.0 88.0 88.0 88.0 88.0 7.8 8 35.6 500 500 500 500 500 500
380 57.6 57.6 57.6 57.6 57.6 57.6 4.1 8 20.0 305 305 305 305 305 305
460 44.5 44.5 44.5 44.5 44.5 44.5 3.6 8 17.8 250 250 250 250 250 250
575 32.5 32.5 32.5 32.5 32.5 32.5 3.0 8 14.0 198 198 198 198 198 198
Compressors Compressors
Rated Load Amps Locked Rotor Amps
F.L.Amps
Fan
Motors
(Each)
No.
of
Fan
Motors
R.L.Amps
Fan
Motors
(Each)
Across-The-Line
No.1 No. 3 No. 5 No.2 No.4 No. 6
IOMM AGZ-5 AGZ 026B through 130B 47
Table 34, AGZ 075BB/BH – 130BB/BH, Electrical Data, M ulti-Point (106°F)
V
Electrical Circuit #1 Electrical Circuit #2
AGZ
Unit
Size
olts
Minimum
Circuit
Ampacity
(MCA)
Power
Supply
Field Wire Field Wire
Gauge
Qty
Wire
75C
Recomm’d
Fuse
or HACR
Breaker
Size
Max. Fuse
or HACR
Breaker
Size
Minimum
Circuit
Ampacity
(MCA)
Power
Supply
Qty
Wire
Gauge
75C
Recomm’d
Fuse
or HACR
Breaker
Size
Max.
Fuse
or HACR
Breaker
Size
075B
085B
090B
100B
110B
120B
230 190 3 3/0 225 250 190 3 3/0 225 250
380 102 3 #2 125 125 102 3 #2 125 125
460 99 3 #3 110 125 99 3 #3 110 125
575 76 3 #4 90 100 76 3 #4 90 100
230 190 3 3/0 225 250 211 3 4/0 250 250
380 102 3 #2 125 125 142 3 1/0 175 175
460 99 3 #3 110 125 111 3 #2 125 150
575 76 3 #4 90 100 83 3 #3 100 110
230 211 3 4/0 250 250 211 3 4/0 250 250
380 142 3 1/0 175 175 142 3 1/0 175 175
460 111 3 #2 125 150 111 3 #2 125 150
575 83 3 #3 100 110 83 3 #3 100 110
230 203 3 4/0 225 250 272 3 300 300 300
380 123 3 #1 150 150 159 3 2/0 175 200
460 101 3 #2 110 125 136 3 1/0 150 175
575 83 3 #4 100 100 109 3 #2 125 125
230 272 3 300 300 300 272 3 300 300 300
380 159 3 2/0 175 200 159 3 2/0 175 200
460 136 3 1/0 150 175 136 3 1/0 150 175
575 109 3 #2 125 125 109 3 #2 125 125
230 272 3 300 300 300 317 3 400 400 400
380 159 3 2/0 200 200 204 3 4/0 250 250
460 136 3 1/0 175 175 159 3 2/0 200 200
575 109 3 #2 125 125 118 3 #1 150 150
130B
230 317 3 400 400 400 317 3 400 400 400
380 204 3 4/0 250 250 204 3 4/0 250 250
460 159 3 2/0 200 200 159 3 2/0 200 200
575 118 3 #1 150 150 118 3 #1 150 150
NOTES:
1. All Electrical Data notes are on page 49.
2. Conduit hubs are not supplied.
48 AGZ 026B through 130B IOMM AGZ-5
Notes for “Electrical Data Single- and Multi-Point” Power:
1. Unit wire size ampacity (MCA) is equal to 125% of the largest compressormotor RLA plus 100% of RLA of all other loads in the circuit including the
control transformer.
2. 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 a circuit will disconnect
all control power to the unit.
3. If a separate 115V power supply is used for the control circuit, then the
wire sizing amps is 10 amps for all unit sizes.
4. Recommended power lead wire sizes for 3 conductors per conduit are
based on 100% conductor ampacity in accordance with NEC. Voltage drop
has not been included. Therefore, it is recommended that power leads be
kept short. All terminal block connections must be made with copper (type
THW) wire.
5. “Recommended Fuse Sizes” are selected at approximately 150% to 175%
of the largest compressor RLA, plus 100% of all other loads in the circuit.
6. “Maximum Fuse or HACR breaker size” is selected at approximately
225% of the largest compressor RLA, plus 100% of all other loads in the
circuit.
7. The recommended power lead wire sizes are based on an ambient
temperature of 86°F (30°C). Ampacity correction factors must be applied
for other ambient temperatures. Refer to the National Electrical Code
Handbook.
8. Must be electrically grounded according to national and local electrical
codes.
Voltage Limitations:
Within ± 10 percent of nameplate rating
Notes for “Compressor and Condenser Fan Amp Draw”:
1. Compressor RLA values are for wiring sizing purposes only but do not
reflect normal operating current draw at rated capacity.
Notes for “Field Wiring Data”
1. Requires a single disconnect to supply electrical power to the unit. This
power supply must either be fused or use an HACR type circuit breaker.
2. All field wiring to unit power block or optional non-fused disconnect
switch must be copper.
3. All field wire size values given in the tables apply to 75°C rated wire per
NEC.
Circuit Breakers
Factory-installed circuit breakers are standard on units with single point power supply
only. This option provides unit-installed compressor short circuit protection and makes
servicing easier.
Connection Type Power Block
Single Point (Standard) Std Opt. Std Opt
Multi-Point (Optional) Std Opt. Not Avail. Opt.
Disconnect
Swt.
Circuit
Breakers
High Short
Circuit Current
IOMM AGZ-5 AGZ 026B through 130B 49
Figure 22, AGZ 026B – AGZ 130B, Typical Field Wiring
A
A
A
A
SCO
DI
3 PHASE
POWER
NNECT
(BY OTHERS)
UNIT MAIN
TERMINAL BLOCK
GND LUG
TO COMPRESSOR(S)
AND FAN MOTORS
NOTE: ALL FIELD WIRING TO BE
INSTALLED AS NEC CLASS 1
WIRING SYSTEM WITH CONDUCTOR
RATED 600 VOLTS
FIELD SUPPL IED
REMOTE STOP SWITCH
(BY OTHERS)
ICE MODE SWITCH
(BY OTHERS)
ALARM BELL
OPTION
CHW FLOW SWITCH
---MANDATORY–(BY OTHERS)
OPTION
CONTROL POWER
N
120VAC
FACTORY SUPPLIED ALARM
FIELD WIRED
ALARM BELL R ELAY
TIME
CLOCK
FUSED CONTRO L
CIRCUIT TRANSFORM ER
DISCONNECT
(BY OTHERS)
10A
FUSE
(BY OTHERS)
CHW PUMP RELAY
120 VAC 1.0 AMP MAX
OFF
UTO
ON
MANUAL
OFF
UTO
ON
MANUAL
(BY OTHERS)
120 VAC
CONTROLLER
TB1
TB2
TB1-20
1
2
35
33
34
CONTROL
CIRCUIT
FUSE
120 VAC
N
120 VAC
32
GND
IF REMOTE STOP
52
72
43
83
54
CONTROL IS USED,
585
REMOVE LEAD 585
FROM TERM. 52
TO 72.
BELL
12
LARM BELL OPTION
LARM BELL
RELAY
COM NO
74
NOR. OPEN PUMP AUX.
CONTACTS (OPTIONAL)
44
61
4-20MA FOR
EVAP. WATER RESET
(BY OTHERS)
4-20MA FOR
DEMAND LIMIT
(BY OTHERS)
DWG. 330423101 REV.0A
+
-
+
-
LESS EVAPORATOR ONLY
LIQUID LINE #1 SOLENOID
24 VAC 1.5 AMP MAX
LIQUID LINE #2 SOLENOID
24 VAC 1.5 AMP MAX
68
69
70
71
GND
91
93
92
93
24 VAC
N
24 VAC
N
50 AGZ 026B through 130B IOMM AGZ-5
Dimensional Data
(
)
(
)
(
)
(
)
(
)
)
Figure 23, Dimensions, AGZ 026BS – 070BS Packaged Chiller
ISOLATOR LOCATIONS ON BOTTOM OF RAIL
13.31
(338.07)
67.76 (1721.10)
COMPRESSOR
CIRCUIT #2
EVAPORATOR
55.65 (1413.51)
COMPRESSOR
CIRCUIT #1
13.31
(338.07)
2.00
(50.8)
2.00
(50.8)
33.52
(851.41)
8.80
(223.52)
19.94
(506.48)
Unit Size
AGZ 026BS
AGZ 030BS
AGZ 035BS
AGZ 040BS
AGZ 045BS
AGZ 050BS
AGZ 055BS
AGZ 060BS
AGZ 065BS
AGZ 070BS
CONTROL PANEL
CONTROL
PANEL
FIELD CONTROL
CONNECTION
Y
EVAP
INLET
94.38 (2397.25)
EVAP
OUTLET
Z
19.94
506.48
88.00 (2235.20
6.38
162.05
X
Center of Gravity - Inches (mm) Weights – Lbs (kg)
X Y Z
39 (991) 40 (1016) 42 (1067) 3 3950 (1792) 3990 (1810)
39 (991) 40 (1016) 42 (1067) 3 3990 (1810) 4040 (1833)
40 (1016) 40 (1016) 42 (1067) 3 4030 (1828) 4080 (1851)
39 (991) 39 (991) 41 (1041) 3 4070 (1846) 4130 (1873)
40 (1016) 38 (965) 41 (1041) 3 4210 (1910) 4270 (1937)
40 (1016) 39 (991) 42 (1067) 3 4330 (1964) 4400 (1996)
40 (1016) 39 (991) 43 (1092) 3 4460 (2023) 4540 (2059)
40 (1016) 39 (991) 43 (1092) 3 4520 (2050) 4600 (2087)
41 (1041) 40 (1016) 45 (1143) 3 4760 (2159) 4860 (2204)
41 (1041) 41 (1041) 45 (1143) 3 4890 (2218) 4990 (2263)
Evap Inlet &
Outlet
Victaulic in.
Shipping Weight Operating W eight
14.33
363.98
POWER ENTRY
POINT
0.875 KNOCK OUT
43.75
1111.25
DWG # 3305195
100.40
2550.16
IOMM AGZ-5 AGZ 026B through 130B 51
Figure 24, AGZ 075BS - 090BS Packaged Chiller
12.4
(315)
14.3
(364)
ISOLATOR LOCATIONS ON BOTTOM OF RAIL
EVAPORATOR
INLET
OUTLET
60.0 (1525)
110.1 (2797)
COMPRESSORS CIRC. #2
COMPRESSORS CIRC. #1
12.
(315)
2.0
(51)
2.0
(51)
CONTROL
PANEL
FIELD CONTROL
CONNECTION
CONTROL
PANEL
POWER ENTRY
POINT
0.875 KNOCK OUT
100.4
(2550)
15.5
(392)
28.5 (724)
Unit Size
AGZ 075BS
AGZ 085BS
AGZ 090BS
Y
28.5
(724)
134.9 (3426)
Center of Gravity Inches (mm) Weights Lbs. (kg)
X Y Z
Z
Evap Inlet &
Outlet Victaulic
in.
Shipping Weight Operating Weight
88.0 (2235)
6.4
(162)
X
43.8
(1111)
14.4
(364)
Dwg. # 3305023
44 (1118) 42 (1067) 60 (1524) 5 6320 (2867) 6530 (2962)
43 (1092) 40 (1016) 60 (1524) 5 6480 (2939) 6690 (3035)
44 (1118) 39 (991) 59 (1499) 5 6640 (3012) 6850 (3107)
52 AGZ 026B through 130B IOMM AGZ-5
Figure 25, AGZ 100BS - 130BS Packaged Chiller
(
)
)
(
)
33.7
(855)
16.2
(410)
ISOLATOR LOCATIONS ON BOTTOM OF RAIL
67.8 (1721)
EVAPORATOR
OUTLET
"A"
"C"
INLET
"A"
173.1 (4396)
67.8 (1721)
COMPRESSORS CIRC. #2
Z
12.4 (315)
2.0
(51)
2.0
(51)
COMPRESSORS CIRC. #1
CONTROL
PANEL
FIELD CONTROL
CONNECTION
Y
24.0
(610)
CONTROL
PANEL
6.4 (162)
88.0 (2235
POWER ENTRY POINT
0.875 KNOCK OUTS
100.4
2550
43.8
1111
14.4 (365)
X
Dwg. # 3305024
"B"
(610)
25.2
(641)
24.0
Unit Size
AGZ 100BS
AGZ 110BS
AGZ 120BS
AGZ 130BS
Evap Inlet
& Outlet
Victaulic
“A” in.
5
5
8
8
Evaporator Water
Connections
Inches (mm)
B C X Y Z
Center of Gravity
Inches (mm)
Weights
Lbs. (kg)
Shipping
Weight
Operating
Weight
14.8 (375.9) 93. 5 (2374.9) 43 (1092) 43 (1092) 76 (1930) 7580 (3438) 7870 (3570)
14. 8 (375.9) 93.5 (2374.9) 44 (1118) 43 (1092) 75 (1905) 7860 (3565) 8150 (3697)
15.3 (388.6) 92. 4 (2346.9) 43 (1092) 40 (1016) 75 (1905) 8380 (3801) 8720 (3955)
15.3 (388.6) 92. 4 (2346.9) 44 (1118) 38 (965) 74 (1880) 8710 (3951) 9050 (4105)
IOMM AGZ-5 AGZ 026B through 130B 53
MicroTech II Controller
Software Version AGZD20101A
Controller Section Table of Contents
Overview............................................................................. 55
Inputs/Outputs................................................................ 55
Setpoints ........................................................................ 57
Shutdown Alarms ...........................................................58
Limit Alarms..................................................................59
Control Logic................................................................. 60
Compressor Control ....................................................... 61
Condenser Fan Control................................................... 65
Using the Controller ............................................................68
Getting Started.....................................................................77
Menu Screens................................................................. 77
Menu Matrix ..................................................................80
View Screens Defined.....................................................81
Alarm Screens Defined...................................................84
Set Screens Defined........................................................84
54 AGZ 026B through 130B IOMM AGZ-5
Overview
MicroTech II controller’s state-of-the-art design not only permits the chiller to run
more efficiently, but also can simplify troubleshooting if a system failure occurs.
Every MicroTech II controller is programmed and tested prior to shipment to facilitate
start-up.
Operator-friendly
The MicroTech II controller menu structure is separated into three distinct categories
that provide the operator or service technician with a full description of 1) current unit
status, 2) control parameters, and 3) alarms. Security protection prevents unauthorized
changing of the setpoints and control parameters.
MicroTech II control continuously performs self-diagnostic checks, monitoring system
temperatures, pressures and protection devices, and will automatically shut down a
compressor or the entire unit should a fault occur. The cause of the shutdown will be
retained in memory and can be easily displayed in plain English for operator review.
The MicroTech II chiller controller will also retain and display the date/time the fault
occurred. In addition to displaying alarm diagnostics, the MicroTech II chiller
controller also provides the operator with a warning of limit (pre-alarm) conditions.
General Description
AGZ-B Inputs/Outputs
Table 35, Analog Inputs
No. Description Type Signal Source Range
1 Evaporator Refrigerant Pressure #1 C1 0.1 to 0.9 VDC
2 Evaporator Refrigerant Pressure #2 C2 0.1 to 0.9 VDC
3 Condenser Refrigerant Pressure #1 C1 0.1 t o 0.9 VDC
4 Leaving Evaporator Water Temperature UT
5 Outside Ambient Temperat ure UT
6 Condenser Refrigerant Pressure #2 C2 0.1 t o 0.9 VDC
7 Reset of Leaving Water Temperature UT 4-20 mA Current 0-(10 to 80°F)
8 Demand Limit UT 4-20 mA Current 0-100 % Load
9 Compressor Suction Temperature #1 C1
10 Compressor Suction Temperat ure #2 C2
NOTE: C1 = Refrigerant Circuit #1, C2 = Ref ri gerant Circuit #2, UT = Unit
NTC Thermister
(10k@25°C)
NTC Thermister
(10k@25°C)
NTC Thermister
(10k@25°C)
NTC Thermister
(10k@25°C)
Table 36, Analog Outputs
No. Description Output Signal Range
1 Fan #1 VFD 0 to 10 VDC 20 to 60 Hz
2 Fan #2 VFD 0 to 10 VDC 20 to 60 Hz
0 to 132 psi
0 to 132 psi
3.6 to 410 psi
-58 to 212°F
-58 to 212°F
3.6 to 410 psi
-58 to 212°F
-58 to 212°F
IOMM AGZ-5 AGZ 026B through 130B 55
Table 37, Digital Inputs
# Description Type Signal Signal
1 Unit OFF Switch UT 0 VAC (Disable) 24 VAC (Enable)
2 Pump Down Switch #1 C1 0 VAC (Disable) 24 VAC (Enable)
3 Evaporator Water Flow Switch UT 0 VAC (No Flow) 24 VAC (Flow)
4 Open
5 Open
6 Pump Down Switch #2 C2 0 VAC (Disable) 24 VAC (Enable)
7 Open
8 Open
9 Phase Voltage Fault #1 (See Note 1) C1 0 VAC (Fault) 24 VAC (No Fault)
10 Phase Voltage Fault #2 (See Note 1) C2 0 VAC (Fault) 24 VAC (No Fault)
11 Ground Fault Prot. #1 (See Note 2 Below) C1 0 VAC (Fault) 24 VAC (No Fault)
12 Ground Fault Prot. #2 (See Note 2 Below) C2 0 VAC (Fault) 24 VAC (No Fault)
13 Remote Start/Stop UT 0 VAC (Disable) 24 VAC (Enable)
14 Open
15 Mechanical High Pressure/Motor Protect
Circuit 1
16 Mechanical High Pressure/Motor Protect
Circuit 2
17 Ice Mode Switch UT 0 VAC (Cool) 24 VAC (Ice)
18 Open
NOTES:
1. See Safety Alarms Table for “Phase Voltage Protection”. Units with single point electrical connection
will have one PVM with Inputs 9 and 10 wired together. Units with multiple point connection will
have two PVM’s with Input 9 for Electrical Circuit #1 and Input 10 for Electrical Circuit #2.
C2 0 VAC (Fault) 24 VAC (No Fault)
C2 0 VAC (Fault) 24 VAC (No Fault)
2. See Safety Alarms Table 40 for “Ground Fault Protection”. Units with single point electrical
connection will have one GFP with Inputs 11 and 12 wired together. Units with multiple point
connection will have two GFP’s with Input 11 for Electrical Circuit #1 and Input 12 for Electrical
Circuit #2.
Table 38, Digital Outputs
No. Description Type Load Output OFF Output ON
1 Alarm C1,C2,UT Alarm Indicator Alarm OFF A l arm ON
2 Evaporator Water Pump UT Pump Contactor Pump OFF Pump ON
3 Condenser Fan #1 C1 Fan Contactor Fan OFF Fan ON
Motor Control Relay #1 =
4
Compr#1
Motor Control Relay #3 =
5
Compr#3
Motor Control Relay #5 =
6
Compr#5
7 Li qui d Li ne #1 C1 Solenoid Cooling OFF Cooling ON
8 Condenser Fan #2 C2 Fan Contactor Fan OFF Fan ON
Motor Control Relay #2 =
9
Compr#2
Motor Control Relay #4 =
10
Compr#4
Motor Control Relay #6 =
11
Compr#6
12 Liquid Li ne #2 C2 Solenoid Cooling OFF Cooling ON
13 Condenser Fan #3 C1 Fan Contactor Fan OFF Fan ON
14 Hot Gas Bypass #1 C1 Solenoid Cooling OFF Cooling ON
15 Hot Gas Bypass #2 C2 Solenoid Cooling OFF Cooling ON
16 Condenser Fan #4 C2 Fan Contactor Fan OFF Fan ON
Condenser Fan #5 ( on 8
17
Fans Only)
Condenser Fan #6 ( on 8
18
Fans Only)
C1 Starter Compressor OFF Compressor ON
C1 Starter Compressor OFF Compressor ON
C1 Starter Compressor OFF Compressor ON
C2 Starter Compressor OFF Compressor ON
C2 Starter Compressor OFF Compressor ON
C2 Starter Compressor OFF Compressor ON
C1 Fan Contactor Fan OFF Fan ON
C2 Fan Contactor Fan OFF Fan ON
56 AGZ 026B through 130B IOMM AGZ-5
Setpoints
The setpoints shown in Table 39 are retained by battery-back-up and remembered
during power off, are factory set to the Default value, and can be adjusted within the
values shown in Range.
The PW (password) column indicates the password. Passwords are as follows:
O = Operator =0100
M = Manager=2001
Table 39, Setpoints
Description Default Range PW
Unit Enable OFF OFF, ON O
Unit Mode COOL COOL, COOL w/Glycol, ICE w/Glycol, TEST O
Control source
Available Modes COOL
Display Units
Language
Protocol Modbus BACnet, LonWorks, Modbus M
Ident number (Modbus only) 001 001-999 M
Baud rate (Modbus only) 9600 1200,2400,4800,9600, 19200 M
Cool LWT
Ice LWT
Evap Delta T
Startup Delta T
Stop Delta T
Max Pulldown Rate
Evap Recirculate Timer 30 15 to 300 sec M
Low Ambient Lockout
Demand Limit No No,Yes M
* Multipoint Power No No,Yes M
Compressor
* Number of Compressors 4 4,6 M
Stage Up Delay 120 90 to 240 sec M
Stage Down Delay 30 20 to 60 sec M
Start-Start 15 min 10 to 60 min M
Stop-Start 5 min 3 to 20 min M
Clear Cycle Timers No No,Yes M
Alarms
Low Evap Pressure-Hold 59 psi 31 to 65 psi M
Low Evap Pressure-Unload 59 ps i 31 to 65 psi M
High Condenser Stage Down 370 psi 365 to 380 psi M
High Condenser Pressure 385 psi 385 to 390 psi M
Evaporator Water Freeze
* Phase Voltage Protecti on No No,Yes M
* Ground Fault Protection No No,Yes M
Evap Flow Proof 5 sec 3 to 30 sec M
Condenser Fans
VFD Enable No No,Yes M
* Number of Fans 4 4,6,8 M
Stage Up 2 Deadband 8 1 t o 20 oF M
Stage Up 3 Deadband 10 1 to 20 oF M
Stage Up 4 Deadband 12 1 to 20 oF M
Stage Down 0 Deadband 15 1 to 20 oF M
Stage Down 1 Deadband 7 1 to 20 oF M
Stage Down 2 Deadband 6 1 to 20 oF M
Stage Down 3 Deadband 5 1 to 20 oF M
VFD Max Speed 100% 90 to 110% M
VFD Min Speed 25% 25 to 60% M
Sat Condenser Temp Target 100
Forced Fan 1 1 1 to # Fans Per Circui t M
Forced Fan 2 2 1 to # Fans Per Circui t M
Forced Fan 3 3 1 to # Fans Per Circui t M
(*) These items are factory set prior to shipment.
DIGITAL
INPUT
COOL, COOL w/GLYCOL, COOL/ICE w/GLYCOL,
44. 0°F 20.0(40.0) to 60.0 °F
40. 0°F 20. 0 to 40.0 °F
10. 0°F 6.0 to 16.0 °F
5.0°F 1.0 to 10.0 °F
0.5°F 0.5 to 3.0°F
1.0°F 0.5 to 5.0 °F
35 °F –2(35) to 60 °F
38.0 °F 18(37) to 42 °F
KEYPAD, BAS, DIGITAL INPUT O
ICE w/GLYCOL. TEST
90 to 130 °F
M
O
O
O
O
O
M
M
M
M
IOMM AGZ-5 AGZ 026B through 130B 57
Automatic Adjusted Ranges
The following are setpoints that will be limited based on the option selected.
Evaporator Leaving Water T em perature
Mode Range
Unit Mode = Cool
Unit Mode = Cool w/Glycol
40 to 60
20 to 60
°F
°F
Evaporator Freeze Temperature
Mode Range
Unit Mode = Cool
Unit Mode = Cool w/Glycol,
Ice w/Glycol
37 to 42
18 to 42
°F
°F
Low Evaporator Pressure Hold and Unload
Mode Range
Unit Mode = Cool 55 to 65 Psig
Unit Mode = Cool w/Glycol,
Ice w/Glycol
31 to 65 Psig
Low Ambient Lockout Temperature
VFD Range
VFD = N
VFD = Y
35 – 60
-2 – 60
°F
°F
Forced Fan 1,2,3
Number of Fans Range
4 1 – 2 fans
6 1 – 3 fans
8 1 – 4 fans
Shutdown Al arms
Shutdown alarms (also know as “Stop Alarms” or “Safeties”) execute rapid compressor
shutdown and require manual reset. They are also logged in the Alarm Log.
The following table identifies each equipment protection alarm, gives the condition
that causes the alarm to occur, and states the action taken because of the alarm. If the
alarm is auto-clearing, the reset condition is also shown. Otherwise, the alarm is
manually reset, requiring the operator to clear the alarm.
58 AGZ 026B through 130B IOMM AGZ-5
Table 40, Shutdown Alarms
Description Occurs When:
No Evaporator Water Flow
Low Evaporator Pressure
High Condenser Pressure Condens er P ress > High Condenser Pressure SP
Mechanical High Condenser
Pressure/Motor Protect
Phase Voltage Protecti on (opt.)
Ground Fault Protection (opt.)
Re-Start Fault Re-Start = Third Time
Evap. Freeze Protect
Leaving Evap. Water Temp.
Sensor Fault
Evaporator Pressure Sensor
Fault
Condenser Pressure Sensor
Fault
Outside Ambient Temp. Sensor
Fault
NOTE: SP=SetPoint
Evap Pump State = RUN AND Evap Fl ow Digital
Input = No Flow for time > Evap Flow Proof SP
Evaporator Press < Low Evap Pressure SP for
time > Low Evap Pressure Delay SP
Digital Input = Off
On Power Up: Delay 150 Sec. before check i ng
If Phase Voltage Protec tion = Y, Then
Digital Input Off= Phas e/Voltage Problem
If Phase Voltage Protec tion = Y, Then
Digital Input Off= Phas e/Voltage Problem
Evap LWT < Evaporator Freeze SP AND Unit state
= enable
Sensor shorted or open
Sensor shorted or open
Sensor shorted or open
Sensor shorted or open
Action
Taken
Rapid Stop
Unit
Rapid Stop
Circuit
Rapid Stop
Circuit
Rapid Stop
Circuit
Rapid Stop
Circuit
Rapid Stop
Circuit
Rapid Stop
Circuit
Rapid Stop
Unit
Normal Stop
Unit
Rapid Stop
Circuit
Rapid Stop
Circuit
Normal Stop
Unit
Reset
Evap flow switch
closes
manual
manual
manual
Phase/Voltage
Input returns to
normal
manual
manual
manual
manual
manual
manual
manual
Events (Limit Alarms)
The following events limit the operation of the chiller in some way, as described in the Action
Taken column. These events are auto-clearing based on reaching the conditions in the reset
column.
Table 41, Limit Alarms
Description Occurs When: Action Taken Reset
Condenser Pressure Stage
Down
Low Ambient Lockout Any com pressor is running AND Outside
Low Evaporator Pressure –
Hold
Low Evaporator Pressure –
Unload
NOTE: SP = Setpoint
Pressure > High Condenser Stage Down
Setpoint
Ambient < Low Amb Lockout SP
Pressure < Low Evap Pressure–Hold
Setpoint
Pressure < Low Evap Pressure–Unload
Setpoint
Shutoff
Stage #2
Shutoff Stages #1
& #2
Hold @
Stage 1
Shutoff
Stage 2
Condenser Press drops
below (SP – 100psi)
Outside Ambient > Low
Amb Lockout
(SP + 5ºF)
Evap Press rises above
(SP + 8psi)
Evap Press rises above
(SP + 10 psi)
Logging
When an alarm or event occurs, the description, date, and time are stored in the active alarm
buffer corresponding to that alarm, viewed on the Alarm Active screens, and also in the alarm
history buffer, viewed on the Alarm Log screens. The active alarm buffers hold a record of all
current alarms. The active alarms can be cleared by pressing the Enter key when the end of the
list has been reached by scrolling. Active alarms may only be cleared if the appropriate
password level is active.
A separate alarm log stores the last 25 alarms and events that occur. When an alarm or event
occurs, it is put into the first slot in the alarm log, and all others are moved down one, dropping
the last entry. The date and time of the occurrence are stored in the alarm log, as well as the
unit state. If the alarm is a circuit alarm, then the circuit state, refrigerant pressures and
temperatures, and number of fans on are also stored. The parameters may be accessed by
scrolling the last line on the alarm log screen (similar to a setpoint).
IOMM AGZ-5 AGZ 026B through 130B 59
Control Logic
Unit Enable
Enabling and disabling the chiller is controlled by the Unit Enable Setpoint, with
options of OFF and ON. This setpoint can be altered by the Unit Off Input, Digital
Input, keypad entry, or BAS request. The Control Source setpoint determines which
source can change the Unit Enable setpoint with options of DIGITAL INPUT,
KEYPAD, or BAS.
Changing the Unit Enable Setpoint can be accomplished according to the following
table.
Table 42, Unit Enable Conditions
Unit Off
Input
OFF x x x x OFF
x SWITCHES OFF x x OFF
ON SWITCHES ON x x ON
ON KEYPAD X OFF x OFF
ON KEYPAD X ON x ON
ON NETWORK x x OFF OFF
ON NETWORK OFF x x OFF
ON NETWORK ON x ON ON
NOTE: An “x” indicates that the value is ignored
Unit Mode Selection
The overall operating mode of the chiller is set by the Unit Mode Setpoint with options
of COOL, COOL w/Glycol, ICE w/Glycol, and TEST. This mode setting can be
altered by the keypad, BAS, and Mode input. Changes to the Unit Mode Setpoint are
controlled by two additional setpoints:
Control Source
Setpoint
Remote Input Keypad Entry BAS Request Enable
• Available Modes Setpoint: Determines the operational modes available at any time
with options of COOL, COOL w/Glycol, COOL/ICE w/Glycol, and TEST.
• Control Source Setpoint: Determines the source that can change the Unit Mode
Setpoint with options of KEYPAD, NETWORK, or SWITCHES.
When the Control source is set to KEYPAD, the Unit Mode stays at its previous setting
until changed by the operator. When the Control source is set to BAS, the most recent
BAS mode request goes into effect, even if it changed while the Control source was set
to KEYPAD or DIGITAL INPUTS.
Changing the Unit Mode Setpoint can be accomplished according to the following
table.
Table 43, Unit Mode Selection
Control Source
Setpoint
x x x x
x x x x COOL w/Glycol COOL w/Glycol
SWITCHES OFF x x COOL/ICE w/Glycol COOL w/Glycol
SWITCHES ON x x COOL/ICE w/Glycol ICE w/Glycol
KEYPAD x COOL w/Glycol x COOL/ICE w/Glycol COOL w/Glycol
KEYPAD x ICE w/Glycol x COOL/ICE w/Glycol ICE w/Glycol
NETWORK x x COOL COOL/ICE w/Glycol COOL w/Glycol
NETWORK x x ICE COOL/ICE w/Glycol ICE w/Glycol
x x x x ICE w/Glycol ICE w/Glycol
x x x x TEST TEST
NOTE: An “x” indicates that the value is ignored.
Mode
Input
Ke ypad E ntry
BAS
Request
Available Modes
Setpoint
COOL
Unit Mode
COOL
60 AGZ 026B through 130B IOMM AGZ-5
Unit Test Mode
N
N
The unit test mode allows manual testing of controller outputs. Entering this mode
requires the following conditions.
Unit OFF input = OFF (i.e., entire chiller is shut down).
Manager password active.
Available Unit Mode setpoint = TEST
A test menu can then be selected to allow activation of the outputs. It is possible to
switch each digital output ON or OFF and set the analog outputs to any value.
Chilled Water Pump Control
Operation of the evaporator pump is controlled by the state-transition diagram shown
below.
TEST: Unit State=OFF &
All Comp State=OFF &
O Evap water freeze condition
Power ON
RUN
OFF
TEST: Unit State = AUTO AND
At least one circuit is enabled for start
OR
Evap water f r eeze condition
TEST: Unit State=OFF &
All Comp State=OFF &
O Evap water fr eeze condition
START
TEST: Flow OK for
Evap Recirc Time
Compressor Control
Compressor Sequencing
This section defines which compressor is the next one to start or stop. The next section
defines when
Compressor sequencing is based primarily on compressor run-hours and starts.
Compressors that have less starts will start before those with more starts. Compressors
that have more run-hours will shut off before those with less run-hours. In the event of
a tie on number of starts, the lower numbered compressor starts first. In the event of a
tie on run-hours, the lower numbered compressor shuts off first.
If possible, the number of running compressors on each circuit will be balanced. If a
circuit is unavailable for any reason, the other circuit is allowed to stage on all
compressors.
IOMM AGZ-5 AGZ 026B through 130B 61
the start, or stop, is to occur.
Required Parameters
• Number of starts for all compressors
• Number of run-hours for all compressors
• Status of all compressors (Available/Unavailable)
• Compressor number
Compressor Start/Stop Timing-Cool Mode
This section defines when a compressor is to start, or stop, and the scenario for doing
so.
Required Parameters
1. Start Delta setpoint.
2. Max Pulldown Rate setpoint
3. Evap Delta T setpoint
4. Number of Compressors/Circuit setpoint
5. LWT error
6. LWT Slope
7. Number of compressors running
8. Interstage timer status
Stage Up
For 2 compressors/circuit:
Control band = Evap Delta T x .25
For 3 compressors/circuit:
Control band = Evap Delta T x .17
IF [LWT Error > Startup_Delta_T_SP + 0.5(Control band)
AND No Compressors Running
AND Stage Up Timer Expired]
THEN Stage_Up_Now = YES
ELSE IF
[LWT Error > 0.5(Control band) AND LWT Slope <= Max Pulldown setpoint
AND Stage Up Timer Expired]
THEN Stage_Up_Now = YES
Stage Down
IF [LWT Error < -0.5(Control band)
AND Stage Down Timer Expires]
THEN Stage_Down_Now = YES
Compressor Start/Stop Timing – Ice Mode
This section defines when a compressor is to start, or stop, and the scenario for doing
so.
Required Parameters
Start Delta setpoint
Evap Delta T setpoint
Number of Compressors/Circuit setpoint
LWT error
Number of compressors running
Interstage timer status
Ice timer status (12 hours between starts)
62 AGZ 026B through 130B IOMM AGZ-5
Stage Up
For 2 compressors/circuit:
Control band = Evap Delta T x .3
For 3 compressors/circuit:
Control band = Evap Delta T x .2
IF
[LWT Error > Startup_Delta_T_SP + 0.5(Control band)
AND Number Comps Running = 0
AND Ice Timer Expired]
THEN Stage_Up_Now = YES
ELSE IF
[LWT Error > 0
AND Number Comps Running > 0
AND Stage Up Timer Expired]
THEN Stage_Up_Now = YES
Stage Down
IF LWT Error < 0
THEN Stage_Down_Now = YES
Leaving Water Reset
The leaving water reset input uses a 4-to-20mA signal to reset the leaving water
setpoint to a higher value. The adjustment varies linearly from 0 degrees F to 10
degrees F, with a reset of 0 for a 4mA signal and a reset of 10 for a 20mA signal.
At all times, the active leaving water setpoint is limited to a maximum of 60°F. T h e
reset remains proportional within the 10 degree band, but the setpoint will simply stop
resetting when it reaches the maximum.
Circuit Capacity Overrides – Limits of Operation
The following conditions override the automatic capacity control when the chiller is in
COOL mode or ICE mode. These overrides keep a circuit from entering a condition in
which it is not designed to run.
Low Evaporator Pressure
If a circuit is running, and the evaporator pressure drops below the Low Evaporator
Pressure-Hold setpoint, no more compressors will be allowed to start on that circuit.
This limit is active until the evaporator pressure reaches the hold setpoint plus 8 psi.
If a circuit is running with two or three compressors on, and the evaporator pressure
drops below the Low Evaporator Pressure-Unload setpoint, the circuit will begin
reducing capacity. If two compressors are running, one of the running compressors
will be stopped. If three compressors are running, then one compressor will be stopped
initially. Ten seconds later, if the pressure has not risen above the unload setpoint,
another compressor will be stopped. The last compressor on a circuit will not stop due
to the unload condition.
IOMM AGZ-5 AGZ 026B through 130B 63
High Condenser Pressure
If the discharge pressure rises above the High Condenser Pressure Unload setpoint, and
more than one compressor on the circuit is running, the circuit will stage down. One
compressor will shutdown as soon as the pressure rises above the unload setpoint, and
if two remain running, then one more will shut down 10 seconds later, if the pressure is
still above the unload setpoint. No stage up will be allowed on the circuit until the
condenser pressure drops to the unload setpoint, less 100 psi, and the outdoor ambient
temperature drops 5 degrees F.
Low Ambient Lockout
If the OAT drops below the low ambient lockout setpoint, then all running circuits will
do a normal stop. Once the lockout has been triggered, no compressors will start until
the OAT rises to the lockout setpoint plus 5 degrees F.
High Ambient Limit
On units not configured with multi-point power connections, the maximum load amps
could be exceeded at high ambient temperatures. If all circuit 1 compressors are
running or all but one compressor on circuit 1, power connection is single point, and
the OAT is greater than 116°F, circuit 2 is limited to running all but one compressor.
The circuit 2 status will indicate if this is the case. This action will allow the unit to
operate at higher temperatures than 116°F.
Unit Capacity Overrides
The following conditions override the automatic capacity control when the chiller is in
COOL mode only.
Demand Limit
The maximum unit capacity can be limited by a 4-to-20 mA signal on the Demand
Limit analog input. This function is only enabled if the Demand Limit setpoint is set to
ON. The maximum unit capacity stage is determined as shown in the following graphs:
Max
Stage
Max
Stage
Limit Signal vs. Max Stage
(with 4 compressors)
4
3
2
1
0.0 25.0 50.0 100.075.0
6
5
4
3
2
1
0
0 16.7 66.7 83.350.0
Limit Signal (%)
Limit Signal vs. Max Stage
(with 6 compressors)
33.3 100.0
Limit Signal (%)
64 AGZ 026B through 130B IOMM AGZ-5
BAS Limit
The maximum unit capacity can be limited by a BAS signal. This function is only
enabled if the unit control source is set to network. The maximum unit capacity stage
is based on the BAS limit value received from the BAS, and is determined as shown in
the graphs in the previous section.
Maximum LWT Rate
The maximum rate at which the leaving water temperature can drop is limited at all
times by the Maximum Rate setpoint. If the rate exceeds this setpoint, no more
compressors will be started until the pulldown rate is less than the setpoint.
Pumpdown
When a circuit reaches a condition where it needs to shut down normally, a pumpdown
cycle will be performed. All but the lowest numbered running compressor will shut off.
During pumpdown, the hot gas bypass and liquid line valves are closed, while a
compressor continues to run. The pumpdown is complete when the evaporator
pressure is less than the low evaporator pressure unload setpoint, less 15 psi, or the
circuit has been in the pumpdown state for 60 seconds.
Condenser Fan Control
Stage Up Compensation
In order to create a smoother transition when another fan is staged on, the VFD
compensates by slowing down initially. This is accomplished by adding the new fan
stage up deadband to the VFD target. The higher target causes the VFD logic to
decrease fan speed. Then, every 10 seconds, 0.5 degree F is subtracted from the VFD
target until it is equal to the saturated condenser temperature target setpoint. This will
allow the VFD to slowly bring the saturated condenser temperature back down.
Fantrol
Condenser Fans Staging is based on condenser pressure as selected by Fan Stage On &
Off setpoints. Fans 1, 3, 5, and 7 are for circuit 1, and fans 2, 4, 6, and 8 are for circuit
2. Fans 1 and 2 start with the first compressor on the respective circuit when the
ambient temperature is greater than 75°F. Below 75°F, these fans start when the
condenser pressure gets up to the stage on setpoint. The compressor must be running in
order to run any fans.
IOMM AGZ-5 AGZ 026B through 130B 65
Fan Stages
There are 2, 3, or 4 fans available per circuit. On 8 fan units, fans 5/7 and 6/8 are
controlled by one contactor for each pair, using virtual stages to allow a difference of
only one fan between stages. See the tables below:
4 and 6 Fan Units
Stage (3-Fan) Fans On Cir. 1 Fans On Cir. 2
1 1 2
2 1,3 2,4
3 1,3,5 2,4,6
8 Fan Units
Stage (2&4-Fan) Fans On Cir 1 Fans On Cir. 2
1 1 2
2 1,3 2,4
3 1,5,7 2,6,8
4 1,3,5,7 2,4,6,8
Normal Operation - Staging Up
At startup, the first fan will start when the saturated condenser temperature rises above
the target. After this, the stage-up deadbands apply.
When the saturated condenser temperature is above the Target + the active deadband, a
Stage Up error is accumulated.
Stage Up Error Step = Saturated Condenser Refrigerant temperature – (Target + Stage
Up dead band)
The Stage Up Error Step is added to Stage Up Accumulator once every Stage Up Error
Delay seconds. When Stage Up Error Accumulator is greater than the Stage Up Error
Setpoint another stage is started.
When a stage-up occurs or the saturated condenser temperature falls back within the
Stage Up dead band, the Stage Up Accumulator is reset to zero.
Normal Operation - Staging Down
There are four Stage Down dead bands, one for each stage.
When the saturated condenser refrigerant temperature is below the Target – the active
deadband, a Stage Down error is accumulated.
Stage Down Error Step = (Target − Stage Down dead band) − Saturated Condenser
Refrigerant temperature
The Stage Down Error Step is added to Stage Down Accumulator once every Stage
Down Error Delay seconds. When the Stage Down Error Accumulator is greater than
the Stage Down Error Setpoint, another stage of condenser fans turns off. The last
stage on will not shut off until the circuit is in an off state.
When a stage down occurs, or the saturated temperature rises back within the Stage
Down dead band, the Stage Down Error Accumulator is reset to zero.
66 AGZ 026B through 130B IOMM AGZ-5
Forced Fan Stage At Start
Fans may be started simultaneously with the compressor based on outdoor ambient
temperature. When the compressor starts, a Fantrol stage is forced based on the
following table.
Table 44, Forced Fan Staging
,
> 75 oF Forced Fan 1 SP
> 90 oF Forced Fan 2 SP
> 105 oF Forced Fan 3 SP
Fantrol Stage At Start
Up to four fans may be forced on when the compressor starts. If the unit has the Optional Low
Ambient VFD option, then only three fans can start with the compressor, and the VFD will start
normally when the saturated condenser temperature is higher than the target.
After forcing fans on, the saturated condenser temperature may temporarily stay below the
target by some amount. In order to keep these fans from staging off, no stage down error can
be accumulated until either the OAT drops below 75
o
F, or the saturated condenser temperature
goes above the target.
Optional Low Ambient VFD
Low ambient air temperature control is accomplished by using the Optional Low Ambient VFD
to control the speed of the first fan on each circuit. This VFD control uses a proportional
integral function to drive the saturated condenser temperature to a target value by changing the
fan speed. The target value is normally the same as the saturated condenser temperature target
setpoint.
The fan VFD always starts when the saturated condenser temperature rises higher than the
target.
What is an Inverter?
The term inverter and variable-frequency drive are related and somewhat interchangeable. An
electronic motor drive, for an AC motor, controls the motor’s speed by varying the frequency of
the power sent to the motor.
An inverter, in general, is a device that converts DC power to AC power. The figure below
shows how the variable-frequency drive employs an internal inverter. The drive first converts
incoming AC power to DC through a rectifier bridge, creating an internal DC bus voltage. Then
the inverter circuit converts the DC back to AC again to power the motor. The special inverter
can vary its output frequency and voltage according to the desired motor speed.
IOMM AGZ-5 AGZ 026B through 130B 67
Inverter Output to the Motor
The AC motor must be connected only to the inverter’s output
terminals. The output terminals are uniquely labeled (to
differentiate them from the input terminals) with the
designations U/T1, V/T2, and W/T3. This corresponds to
typical motor lead connection designations T1, T2, and T3.
The consequence of swapping any two of the three connections
is the reversal of the motor direction. This must not be done.
In applications where reversed rotation could cause equipment
damage or personnel injury, be sure to verify direction of
rotation before attempting full-speed operation. For safety to
personnel, the motor chassis ground must be connected to the
ground connection at the bottom of the inverter housing.
Notice the three connections to the motor do not include one marked “Neutral” or “Return.”
The motor represents a balanced “Y” impedance to the inverter, so there is no need for a
separate return. In other words, each of the three “Hot” connections serves also as a return for
the other connections, because of their phase relationship.
Do not to switch off power to the inverter while the motor is running (unless it is an emergency
stop). Also, do not install or use disconnect switches in the wiring from the inverter to the motor
(except thermal disconnect).
Inverter Front Panel Keypad
The CR100 Series inverter front keypad contains all the elements for both monitoring and
programming parameters. The keypad layout is pictured below. The fan VFD is programmed in
the factory before shipment and no field programming is required.
Key and Indicator Legend
Run/Stop LED - ON when the inverter output is ON and the motor is developing torque (Run
Mode), and OFF when the inverter output is OFF (Stop Mode).
Program/Monitor LED - This LED is ON when the inverter is ready for parameter editing
(Program Mode). It is OFF when the parameter display is monitoring data (Monitor Mode).
Run Key Enable LED - is ON when the inverter is ready to respond to the Run key, OFF when
the Run key is disabled.
Run Key - Press this key to run the motor (the Run Enable LED must be ON first). Parameter
F_04, Keypad Run Key Routing, determines whether the Run key generates a Run FWD or Run
REV command.
68 AGZ 026B through 130B IOMM AGZ-5
Stop/Reset Key - Press this key to stop the motor when it is running (uses the programmed
deceleration rate). This key will also reset an alarm that has tripped.
Potentiometer -Allows an operator to directly set the motor speed when the potentiometer is
enabled for output frequency control.
Potentiometer Enable LED - ON when the potentiometer is enabled for value entry.
Parameter Display - A 4-digit, 7-segment display for parameters and function codes.
Display Units, He rtz/ Amperes - One of these LEDs will be ON to indicate the units associated
with the parameter display.
Power LED - This LED is ON when the power input to the inverter is ON.
Function Key - This key is used to navigate through the lists of parameters and functions for
setting and monitoring parameter values.
Up/Down (
1
,
2
) Keys - Use these keys alternately to move up or down the lists of
parameter and functions shown in the display, and increment/decrement values.
Sto re ( ) Key - When the unit is in Program Mode and you have edited a parameter value,
press the Store key to write the new value to the EEPROM.
Keypad Navigational Map
The CR100 Series inverter front keypad contains all the elements for both monitoring and
programming parameters. The diagram below shows the basic navigational map of parameters
and functions.
IOMM AGZ-5 AGZ 026B through 130B 69
NOTE: The inverter 7-segment display shows lower case “b” and “d,” meaning the same as the
upper case letters “B” and “D” used in this manual (for uniformity “A to F”).
NOTE: The Store Key saves the edited parameter (shown in the display) to the EEPROM in the
inverter, regardless of the programming device. Upload and download of parameters is
accomplished through a separate command—do not confuse Store with Download or Upload.
Troubleshooting Tips
The table below lists typical symptoms and the corresponding solution(s).
Symptom
Condition
The inverter
outputs [U],
[V], [W] are
not supplying
voltage.
The
motor
will not
run.
Inverter
outputs [U],
[V], [W] are
supplying
voltage.
The optional
remote
operator is
used (SRW).
The direction of the motor
is reversed.
The motor speed will not
reach the target
frequency (desired
speed).
Continued on next page.
• Is the frequency command source A_01
• Is t he Run command source A-02
• Is power being suppl i ed t o terminals [L1],
• Is t here an error code E X X displayed? • Pres s the Func. key and determine t he error
• Are the si gnals to the intelligent input
• Is the Run Command active?
• Has the f requency setting for F_01 been
• Are the c ontrol circuit terminals [H], [O],
• Is t he RS (reset) function or FRS (free-run
• Is the motor load too heavy? • Reduce load, and test the motor
• Are the operat i onal settings between the
• Are the c onnections of output term i nal s
• Is t he phase sequence of the motor
• Are the c ontrol terminals [FW] and [RW]
• Is parameter F_04 properly set?
• If us i ng the analog input, is the current or
• Is the load too heavy? • Reduce the load
• Is the inverter internally limit i ng t he output
Probable Cause Solution
parameter setting correct?
parameter setting correct?
[L2], and [L3/N]? If so, the POWER l a mp
should be ON.
terminals correct?
Is the {FW] terminal (or [RV]) connect ed to
[P24] (via switch, etc.)
set greater than zero?
and [L] connected to the potentiometer?
stop) function ON?
remote operator and the inverter unit
correct?
[U/T1], [V/T2] , and [W/T3] c orrect?
forward or reverse with respect to [U/T1] ,
[V/T2], and [W/T3]?
wired correctly?
voltage at [O] or [OI]?
frequency?
• Make sure the parameter setting A-01 is
correct.
• Make sure the parameter setting A-02 is
correct.
• Check terminals [L1], [L2], and [L3/N], then
[U/T1], [V/T2] , and [W/T3].
• Turn ON the power supply or check fuses.
type. Eliminate the error cause, then clear the
error (Reset).
• Verify the terminal functions for C_01 – C_05
are correct.
• Turn ON Run Command enable.
• Supply 24V to {FW] or [RV] t erminal, if
configured.
• Set t he parameter for F_01 to a safe, nonzero value.
• If t he potentiometer is the frequency setting
source, verify voltage at [O ] > 0V.
• Turn OFF the command(s).
independently.
• Check the operator type setting.
• Make connec t i ons according to the phase
sequence of the motor. I n general :
FWD = U-V-W, and
REV = U-W-V.
• Use terminal [FW] for forward, and [RV] for
reverse.
• Set motor direction in F_04.
• Reduce the l oad.
• Heavy loads ac tivate the overload restricti on
feature (reduces output as needed).
• Heavy loads ac tivate the overload restricti on
feature (reduces output as needed).
• Check max frequency setting (A_04).
• Check frequency upper limit setting (A_61).
70 AGZ 026B through 130B IOMM AGZ-5
Symptom Condition Probable Cause Solution
The RPM of the motor does
not match the inverter output
frequency setting.
No
downloads
have
Inverter data is
not correct.
A parameter
will not change
after an edit
(reverts to old
setting).
occurred.
A download
to the
inverter was
attempted.
True for
certain
parameters.
True for all
parameters.
• Is the maximum frequency setting A_04
correct?
• Does the monitor function D_01 displ ay
the expected output frequency?
• Was power turned OFF after a
parameter edit but before pressing the
Store key?
• Edits to data are permanently stores at
power down. Was the time from power
OFF to power ON less than six
seconds?
• Was the power turned OFF within six
seconds after the dis pl ay changed from
REMT to INV?
• Is the inverter in Run Mode? Some
parameters cannot be edited duri ng
Run Mode.
• If you’re using the [SFT] intelligent input
(software lock function)i s the [SFT]
input ON?
• Verify the V/f settings match motor
specification.
• Make sure all scaling (such as A_11 to
A_14) is properly set.
• Edit the data and press the Store key once.
• Wait six seconds or more bef ore turning
power OFF after editing data.
• Copy data to t he i nverter again, and keep
power ON for six seconds or more after
copying.
• Put in vert er i n Stop Mode (press the
Stop/reset key). Then edit the parameter.
• Change the st ate of the SFT input, and
check the B_31 parameter (SFT mode).
Monitoring Trip Events, History. & Conditions
Fault Detection and Clearing
The microprocessor in the inverter detects a variety of fault
conditions and captures the event, recording it in a history
table. The inverter output turns OFF, or “trips” similar to the
way a circuit breaker trips due to an over-current condition.
Most faults occur when the motor is running (refer to the
diagram to the right). However, the inverter could have an
internal fault and trip in Stop Mode. In either case, you can
clear the fault by pressing the Stop/Reset key.
IOMM AGZ-5 AGZ 026B through 130B 71
Error Codes
An error code will appear on the display automatically when a fault causes the inverter to trip The
following table lists the cause associated with the error.
Error
Code
E01
E02
E03
E04
E05
E07
E08
E09
E11
E22
E12
E13
E14
E15
E21
E35
---U
Name Cause(s)
Over current event while at constant
speed
Over current event during deceleration
Over current event during acceleration
Over current event during
other conditions
Overload protection
Over voltage protection
EEPROM error
Under-voltage error
CPU error
External trip
USP
Ground fault
Input over-voltage
Inverter thermal trip
Thermistor
Under-voltage (brownout) with output
shutoff
The inverter output was short-circui ted, or the motor shaft i s locked or
has a heavy load. These conditions cause excessive current for the
inverter, so the inverter output i s turned OFF.
The dual-voltage motor is wired incorrectly.
When a motor overl oad i s detected by the electronic t hermal function,
the inverter trips and turns OFF its output.
When the DC bus voltage exceeds a threshold, due to regenerative
energy from the motor.
When the built-in EEPROM memory has problem s due to noise or
excessive temperature, the i nverter trips and turns OFF its output t o
the motor.
A decrease of internal DC bus voltage below a threshold results in a
control circuit faul t This condition can also generate exces sive motor
heat or cause low torque. The inverter trips and t urns OFF its output.
A malfunction in the built-in CPU has occurred, so the inverter trips
and turns OFF its output to the motor.
A signal on an intelligent input terminal c onf igured as EXT has
occurred. The inverter trips and turns OFF the output to the motor.
When the Unattended S t art Protection (LJSP) is enabl ed, an error
occurred when power is applied while a Run signal is present. The
inverter trips and does not go into Run Mode unt i l t he error i s cleared.
The inverter is protected by the det ection of ground faults between the
inverter output and the motor during powerup tes ts. This feature
protects the inverter, and does not protect humans.
When the input volt age i s higher than the specified value, i t is
detected 100 seconds aft er powerup and the inverter trips and turns
OFF its output.
When the inverter int ernal temperature is above the threshol d, the
thermal sensor in the i nvert er module detects the excess i ve
temperature of the power devices and t ri ps, turning the inverter output
OFF.
When a thermistor is connected to terminals {5} and [CM1] and the
inverter has sensed the temperature is too high, the inverter t ri ps and
turns OFF the output.
Due to low input voltage, the inverter turns i ts output OFF and tries to
restart. If it f ai l s to restart, then the alarm trips to record the undervoltage error event.
Note: If an EEPROM error (E08) occurs, be sure to confirm the parameter data values are still
correct. If the power is turned OFF while the [RS] (Reset) intelligent input terminal is ON, an
EEPROM error will occur when power is restored.
Trip History and Inverter Status
Always find the cause of the fault before clearing it. When a fault occurs, the inverter stores
important performance data at the moment of the fault. To access the data, use the monitor
functions (D_xx) and select D_08 for details about the present fault (E
past two trip events (E
The following Monitor Menu map shows how to access the error codes. When fault(s) exist, you
can review their details by first selecting the proper function: D_08 displays current trip data, and
D09 displays trip history.
72 AGZ 026B through 130B IOMM AGZ-5
n-1
) and E
n-2
) using the D_09 Trip History function.
n
), or the error code for the
VFD Monthly and Yearly Inspection Chart
Item Inspected Check for ...
Ambient
environment
Overall
Main
circuit
Control
circuit
Display LEDs Legibility
Major devices
Power supply
voltage
Ground Insulation
Mounting
Components Overheating
Housing Dirt, dust
Terminal block Secure connections
Smoothing
capacitor
Relay(s) Chattering
Resistors Cracks or discoloring
Cooling fan
Overall
Capacitor No leaks or deformation
Extreme Temperatures &
humidity
Abnormal noise &
vibration
Voltage tolerance
Adequate resistance
No loose screws
Leading, swelling
Noise
Dust
No order, discoloring,
corrosion
Frequency
Month Year
Inspection Method
Thermometer, hygrometer
Vis ual & aural
Digital volt meter, measure
between inverter terminals
[L1], [L2], [L3}
Digital volt meter, GND to
terminals
Torque wrench
Thermal trip events No trip events
Visual Vacuum dust & dirt
Visual No abnormalities
Visual
Aural
Visual
Power down, manually rotate Rotation must be smooth
Vis ual Vacuum to clean
Visual No abnormalities
Visual Undistorted appearance
Vis ual All LED segments work
Ambient temperature
between – 10 to 40°C, noncondensing
Stable environment for
electronic controls
200V class:
200 to 240V 50/60 Hz
400V class:
380 to 460V 50/60 Hz
5 Meg. Ohms or greater
M3: 0.5 – 0.6 Nm
M4: 0.98 – 1.3 Nm
M5: 1.5 – 2.0 Nm
No abnormalities
Single click when switching
ON or OFF
Use Ohm meter to check
braking resistors
Criteria
IOMM AGZ-5 AGZ 026B through 130B 73
Important Messages
WARNING
WARNING HIGH VOLTAGE: Motor control equipment and electronic controllers are
connected to hazardous line voltages. When servicing drives and electronic controllers,
there may be exposed components with housings or protrusions at or above line
potential. Extreme care should be taken to protect against shock.
Stand on an insulating pad and make it a habit to use only one hand when checking
components. Always work with another person in case an emergency occurs.
Disconnect power before checking controllers or performing maintenance. Be sure
equipment is properly grounded. Wear safety glasses whenever working on electronic
controllers or rotating machinery.
WARNING
Wait at least five (5) minutes after turning OFF the input power supply before
performing maintenance or an inspection.
Otherwise, there is the danger of electric shock.
Introduction
This end of this section lists the parameters for the CR100 series inverters and the values as
programmed in the factory.
Unit identification
Parameter Settings for Keypad Entry
Main Profile Parameters
“F” Group Parameters
Function
Code
F_01 Output Frequency Setting
F_02 Acceleration (1)
F_03 Deceleration (1)
F_04 Keypad Run Key Routing
Name
McQuay
Setting
0.0
10.0
10.0
00
74 AGZ 026B through 130B IOMM AGZ-5
Standard Functions
“A” Group Parameters
Function
Code
A_01 Frequency source setting 01
A_02 Run command source setting 01
A_03 Base frequency sett i ng 60.0
A_04 Maximum frequency setting
A_11 O-L input active range start frequency
A_12 O-L input active range end frequency
A_13 O-L input active range start vol tage
A_14 O-L input active range end voltage
A_15 O-L input start frequency enabl e
A_16 External frequency filter t i me constant
A_20 Multi-speed 0 setting
A_21 Multi-speed 1 setting
A_22 Multi-speed 2 setting
A_23 Multi-speed 3 setting
A_24 Multi-speed 4 setting
A_25
A_26 Multi-speed 6 setting
A_27 Multi-speed 7 setting
A_28 Multi-speed 8 setting
A_29 Multi-speed 9 setting
A_30 Multi-speed 10 setting
A_31 Multi-speed 11 setting
A_32 Multi-speed 12 setting
A_33 Multi-speed 13 setting
A_34 Multi-speed 14 setting
A_35 Multi-speed 15 setting
A_38 Jog frequency setti ng
A_39 Jog stop mode
A_41 Torque boost method selection
A_42 Manual torque boost value
A_43
A_44 V/f characteristic curve selecti on
A_45 V/f gain setting
A_51 DC braking enable
A_52 DC braking frequency sett i ng
Multi-speed 5 setting
Manual torque boost frequency
adjustment
Name
McQuay
Setting
60.0
100
01
1.0
00
00
11
10.0
00
100
00
0.5
“A” Group Parameters
Function
Code
A_53 DC braki ng wait time 0.0
A_54 DC braki ng force during deceleration 0
A_55
A_61 Frequency upper l i mit setting
0
0
0
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
A_62 Frequency l ower limit setting
A_63,
A_65,
A_67
A_64-
A_66
A_68
A_71 PID Enable
A_72 PI D proportional gain
A_73 PI D i ntegral time constant
A_74 PI D deri vat i ve gai n
A_75 PV scale conversion
A_76 PV source setting
A_81 AV R function select
A_82 AVR voltage select
A_92 Second acceleration time s et ting
A_93 Second deceleration time setting
A_94
A_95 Acc1 to Acc2 frequency transition point
A_96
A_97 Acceleration curve selection
A_98 Decel eration curve selection
DC braking time during deceleration
Jump (center) frequency setting
Jump (hysteresis) frequency width
setting
Select method to s witch to second
accel/decel profile
Dec1 to Dec2 frequency transi tion
point
Name
McQuay
Setting
0.0
0.0
0.0
0.0
0.5
00
1.0
1.0
0.0
1.00
00
00
230/460
15.0
15.0
00
0.0
0.0
00
00
IOMM AGZ-5 AGZ 026B through 130B 75
Fine Tuning Functions
“B” Group Parameters
Function
Code
B_01 Selection of automatic restart 00
B_02
B_03 Retry wait time before motor restart 1.0
B_12 Level of electronic t hermal setting
B_13 Electronic thermal characteristic
B_21 Overload restriction operat i on mode
B_22 Overload restriction s etting
B_23 Deceleration rate at overload res triction
B_31 Software lock mode selection
B_32 Reactive current setting
B_81 {FM] terminal analog m eter adjustment
B_82 Start frequency adjus tment
B_83 Carrier frequency setting
B_84
B_85 Country code for initial i zat i on
B_86 Frequency scaling convers i on factor
B_87 STOP key enable
B_88 Restart mode aft er FRS
B_89 Data select for digi t al op. OPE-J
Allowable under-voltage power failure
time
Initialization mode (parameters or trip
history)
Name
McQuay
Setting
1.0
Rated
current for
each
inverter
01
01
Rated
current x
1.25
1.0
01
Rated
current x
0.58
80
0.5
5.0
00
02
1.0
00
00
01
Intelligent Terminal Functions
“C” Group Parameters
Function
Code
C_01 Terminal [1] function 00
C_02 Terminal [2] function 01
C_03 Terminal [3] function 16
C_04 Terminal [4] function
C_05 Terminal [5] function
C_11 Terminal [1] active state
C_12 Terminal [2] active state
C_13 Terminal [3] active state
C_14 Terminal [4] active state
C_15 Terminal [5] active state
C_21 Terminal [11] function
C_22 Terminal [12] function
C_23 [FM] signal selection
C_31
C_32
C_33 Alarm relay terminal active s tate
C_41 Overload level setting
C_42 Frequency arrival setting for accel
C_43 Arrival frequency setting for decel
C_44 PID deviation level setting
C_91 Debug mode enable
Terminal [11] active state (-FU)
Reserved (-FE / FR)
Terminal [12] active state (-FU)
Terminal [11] active s tate (-FE / FR)
Name
McQuay
Setting
13
18
00
00
00
01
00
01
00
00
00
00
01
Inverter
rated
current
0.0
0.0
3.0
00
76 AGZ 026B through 130B IOMM AGZ-5
Using the Controller
4x20 Display & Keypad
Layout
The 4-line by 20-character/line liquid crystal display and 6-key keypad are shown
below.
Figure 26, Display (in MENU mode) and Keypad Layout
Key to Screen Pathway
Air Conditioni ng
ALARM
<
VIEW
<
<
SET
MENU Key
ARROW Keys (4)
ENTER Key
Note that each ARROW key has a pathway to a line in the display. Pressing an
ARROW key will activate the associated line when in the MENU mode.
Getting Started
There are two basic procedures to learn in order to utilize the MicroTech II controller:
1. Knowing where a particular screen is located and navigating through the menu
matrix to reach it.
2. Knowing what is contained in a menu screen and how to read that information or
how to change a setpoint contained in the menu screen.
Navigating Through the Menus
The menus are arranged in a matrix of screens across a top horizontal row. Some of
these top-level screens have sub-screens located under them. The general content of
each screen and its location in the matrix are shown in Figure 28 on page 80. A
detailed description of each menu begins on page 81.
There are two ways to navigate through the menu matrix to reach a desired menu
screen.
1. Scroll Mode: Scroll through the matrix from one screen to another using the four
ARROW keys.
2. Menu Mode: Use shortcuts to work through the matrix hierarchy. From any menu
screen, pressing the MENU key will take you to the top level of the hierarchy. The
display will show ALARM, VIEW, and SET as shown in Figure 26. This
corresponds to the second row of screens on Figure 28. One of these groups of
IOMM AGZ-5 AGZ 026B through 130B 77
screens can then be selected by pressing the key connected to it via the pathway
shown in Figure 26.
For example, selecting ALARM will go the next row of menus under ALARM
(ALARM LOG or ACTIVE ALARM). Selecting VIEW will go the next level of
screens under VIEW (VIEW UNIT STATUS or VIEW UNIT TEMP). Selecting SET
will go to a series of screens for viewing and changing setpoints.
MENU Key
The MENU key is used to switch between the shortcut method (known as the MENU
mode and as shown in Figure 26) and scrolling method (known as the SCROLL mode
shown in Figure 27). The MENU mode is the shortcut to specific groups of menus
used for checking ALARMS, for VIEWING information, or to SET setpoint values.
The SCROLL mode allows the user to move about the matrix (from one menu to
another, one at a time) by using the four ARROW keys. A typical menu screen is
shown in Figure 27.
Pressing the MENU key from any menu screen will automatically return you to the
MENU mode as shown in Figure 26.
Figure 27, Display in the Shortcut ( SCRO LL) M ode and Keypad Layout
MENU Key
Air Conditioni ng
VIEW UNIT ST ATUS
Unit = COOL
Compr. #1/#2=OFF/OFF
Evap Pump = RUN
ARROW Keys (4)
ENTER Key
Menu Screens
The menus are shown in the controller display. Each menu screen shows specific
information; in some cases menus are used only to view the status of the unit, in some
cases they are used for checking and clearing alarms, and in some cases they are used
to set setpoint values.
The ARROW keys on the controller can be used to navigate through the menus. The
keys are also used to change numerical setpoint values contained in certain menus.
Changing Setpoints
Pressing the ENTER key changes the function of the ARROW keys to the editing
function as shown below:
LEFT key Default
, changes a value to the factory-set default value.
RIGHT key Cancel
UP key Increment
DOWN key Decrement
These four edit functions are indicated by one-character abbreviation on the right side
of the display (this mode is entered by pressing the ENTER key).
78 AGZ 026B through 130B IOMM AGZ-5
, cancels any change made to a value and returns to the original
setting.
, increases the value of the setting
decreases the value of a setting.
Most menus containing setpoint values have several different setpoints shown on one
menu. When in a setpoint menu, the ENTER key is used to proceed from the top line
to the second line and on downward. The cursor will blink at the entry point for
making a change. The ARROW keys (now in the edit mode) are used to change the
setpoint, as described above. When the change has been made, press the ENTER key
to enter it. No setting is changed until the ENTER key is pressed.
For example, to change the chilled water setpoint:
1. Press MENU key to go to the MENU mode (see Figure 26).
2. Press SET (the UP Key) to go to the setpoint menus.
3. Press UNIT SPs (the Right key) to go to setpoints associated with unit operation.
4. Press the DOWN key to scroll down through the setpoint menus to the third menu
which contains Evap LWT=XX.X°F.
5. Press the ENTER key to move the cursor down from the top line to the second line
in order to make the change.
6. Use the ARROW keys (now in the edit mode as shown above) to change the setting.
7. When the desired value is achieved, press ENTER to enter it. The cursor will
automatically move down.
At this point, the following actions can be taken:
1. Change another setpoint in this menu by scrolling to it with the ENTER key
2. Using the ENTER key, scroll to the first line in the menu. From there the ARROW
keys can be used to scroll to different menus.
IOMM AGZ-5 AGZ 026B through 130B 79
Figure 28, Menu Matrix
VIEW UNIT
STATUS (1)
VIEW UNIT
STATUS (5)
(Right side of matrix continued from above)
ALARM LOG
TYPE, TIME
ALARM LOG
(NEXT TO LAST)
ALARM LOG
LAST 25 SHOWN
VIEW UNIT
TEMP (1)
VIEW UNIT
TEMP (2)
VIEW CIR #1
STATUS (1)
VIEW CIR #1
STATUS (4)
⇐ Continued ⇐
"ALARM" MENUS "SET" MENUS
SET UNIT
SET UNIT
(LAST)
ACTIVE ALARM
(1)
TYPE, TIME
ACTIVE ALARM
(2)
TYPE, TIME
ACTIVE ALARM
(n)
CLEAR/VIEW
"VIEW" MENUS
VIEW CIR #2
STATUS (1)
VIEW COMP
#2 STATUS (2)
SPs, (1)
SPs, (13)
VIEW REFRIG CIR
#1 STATUS (1)
VIEW REFRIG CIR
#1 STATUS (3)
SET COMP
SPs (1)
SET COMP
SPs (2)
SET ALARM
LIMITS (1)
SET ALARM
LIMITS (4)
VIEW REFRIG CIR
#2 STATUS (1)
VIEW REFRIG CIR
#2 STATUS (2)
SET FANS
SP(1)
SET FANS
SP (3)
"MENU"
VIEW FAN S
(1)
VIEW FAN S
(3)
TEST
UNIT (1)
TEST
UNIT (6)
Menu Structure (Hierarchical)
As discussed previously, a hierarchical menu structure can be used to access the
various screens. One to twenty-five levels can be used below the top-level menu, with
two or three being typical. Optionally, the last menu selection can access one of a set
of screens that can be navigated with the UP/DOWN ARROW keys (see the scrolled
menu structure below).
Menu selection is initiated by pressing the MENU key that changes the display from a
regular data screen to a menu screen. Menu selections are then made using the arrow
keys according to labels on the right side of the display (the arrows are ignored). When
the last menu item is selected, the display changes to the selected data screen. An
example follows showing the selection of the “VIEW COMPRESSOR (n) screen.
Assume the initial screen resembles the screen below or any other menu screen:
ALARM LOG
(data)
(data)
(data)
After pressing the MENU key, the top level menu screen will show:
< ALARM
< VIEW
< SET
80 AGZ 026B through 130B IOMM AGZ-5
After pressing the “VIEW” menu key, a menu screen will show:
VIEW < UNIT
< COMPRESSOR
< REFRIGRANT
< FANS
Selection of any of these will advance to the appropriate data menu. For example, after pressing
REFRIGERANT” menu button, the selected data screen will show:
the “
VIEW REFRIG
PSI °°°°F
SAT EVAP XXX.X XX.X
SAT COND XXX.X XX.X
The ARROW keys will automatically return to the “scroll” mode at this time.
Screen Definitions: VIEW
This section contains information on each menu screen. The menu screens are in order
of the matrix in Figure 28, going from left to right and then down when there are submenus. Many menus are self-explanatory.
VIEW UNIT STATUS
VIEW UNIT STATUS (1)
Off:Unit Switch
Cool Stage=0
Evap Pump=Off
Unit states can be OFF, AUTO, and ALARM as determined by the authority Switch,
Remote, Etc.
VIEW UNIT STATUS (2)
Demand Limit= Stg X
Network Limit=Stg X
VIEW UNIT STATUS (3)
Stg Up Delay=XXXXsec
Stg Dn Delay=XXXXsec
Ice Delay= XXh XXm
Ice Delay only appears when in the ICE mode.
VIEW UNIT STATUS (4)
D.O. 111111111
123456789012345678
111111111111111111
This menu gives the status of digital outputs (D.O.), 1=ON, 0=OFF. Numbers are 1
through 18. See Table 38, Digital Outputs, on page 56 for number reference.
IOMM AGZ-5 AGZ 026B through 130B 81
VIEW UNIT STATUS (5)
D.I. 111111111
123456789012345678
111111111111111111
This menu gives the status of digital inputs (D.I.). 1=ON, 0=OFF. Numbers are 1
through 18. See Table 37, Digital Inputs, on page 56 for number reference.
VIEW UNIT STATUS (6)
Analog Outputs
(volts X 100)
1=XXX.X 2=XXX.X
This menu give the output voltage for fans #1 and #2 VFD. Divide by 100 for actual
voltage.
VIEW UNIT TEMPERATURES
VIEW UNIT TEMP (1)
Evap LWT = XXX.X °°°°F
OAT = XXX.X °°°°F
LWT Target = XX.X °°°°F
VIEW UNIT TEMP (2)
LWT Pulldn=XX.X °°°°F/m
Control Band=XX.X °°°°F
VIEW CIRCUIT STATUS
The following four screens are duplicated for circuit # 2. Units with two
compressors per circuit (AGZ 026 through AGZ 090) will not have screen #4
present. Circuit 1 has compressor #1, #3, (#5), circuit 2 has compressor #2, #4,
(#6).
VIEW CIR1 STATUS (1)
Off:Pumpdown Switch
VIEW CIR1 STATUS (2)
Comp1=Off
Hours= XXXXX
Starts= XXXXX
VIEW CIR1 STATUS (3)
Comp3=Off
Hours= XXXXX
Starts= XXXXX
82 AGZ 026B through 130B IOMM AGZ-5
VIEW CIR1 STATUS (4)
Comp5=Off
Hours= XXXXX
Starts= XXXXX
SCREEN DEFINITION: VIEW REFRIGERANT
The following three screens are duplicated for circuit #2.
VIEW REFRG CIR 1 (1)
Evap Press= XXX.Xpsi
Cond Press= XXX.Xpsi
VIEW REFRG CIR 1 (2)
Sat Evap= XXX.XoF
Sat Cond= XXX.XoF
VFD Target= XXX.XoF
VIEW REFRG CIR 1 (3)
Suct Temp= XXX.XoF
Superheat= XXX.XoF
Evap Appr= XX.XoF
Evap Appr (evaporator approach temperature) is the difference between the leaving
fluid temperature and the saturated evaporator temperature. It is an indication of the
evaporator efficiency; an increasing approach temperature indicates decreasing heat
transfer efficiency.
SCREEN DEFINITION: VIEW FANS
VIEW FANS (1)
Fans On VFD Speed
Cir 1= X XXX.X%
Cir 2= X XXX.X%
VIEW FANS (2)
Stg Error Up Down
Cir 1= XXX XXX
Cir 2= XXX XXX
VIEW FANS (3)
Sat Cond
Target= XXX.X°°°°F
See explanation of fan operation on page 65.
IOMM AGZ-5 AGZ 026B through 130B 83
Screen Definitions – ALARM
Alarm Log (X)
Alarm Description
Time/Date
Data:Edit and scroll
The last 25 alarms, either shutdown or limit, are shown in this menu with earlier alarm
menus stored under it. ARROW DOWN from this menu will go to the next-to-last
alarm, ARROW DOWN again will go to the second from last, and so on through the
last 25 occurrences. The screens are numbered (1), (2), (3),....(X).
Alarm Active
Alarm Description
Time/Date
.
Alarm Active
No more alarms
Press ENTER to clear
all active alarms
If the unit is off on a shutdown alarm, or running, but in a limit alarm condition, the
cause, date/time, and UNIT STATUS will appear in the ALARM ACTIVE screen. The
remote alarm relay will close, and a red light will appear behind the LEFT button. T he
light will go out when the fault is cleared. If there is a simultaneous occurrence of
more than one alarm, the others will appear in additional screens below this one,
accessed by the DOWN ARROW.
If an alarm occurs, press the MENU button, then the LEFT button for ALARM, and
then the left button again to reach the ALARM ACTIVE screen.
The cause of the alarm must be remedied before attempting to clear the alarm. To clear
the alarm(s), scroll down to the last screen (bottom screen above) and press ENTER.
The SET UNIT SPs screen will appear and the password will be asked for. Press
ENTER and the cursor will flash in the password field. Press the UP button to scroll
the numbers up to the required password. Press ENTER to clear.
If other faults have appeared, they will all be cleared at the same time.
Screen Definitions – SET
Changing setpoints; in general, setpoints are changed as follows:
1. Select the desired menu by scrolling through SET menus with the UP, DOWN,
LEFT and RIGHT ARROWS. Alternatively, press the MENU button, select the
type of setpoint desired, then up or down to the exact screen.
2. When the desired menu is selected, select the desired field within the menu by
moving between lines using the ENTER key. Some fields may not be accessible
due to settings in other menus.
3. If a numerical value is being changed, use the INCREMENT key (UP ARROW) to
increase or the DECREMENT key (DOWN ARROW) to decrease the value of the
setpoint.
84 AGZ 026B through 130B IOMM AGZ-5
If a word-type setpoint (for example, YES or NO) is to be selected, the choices are
loaded into the menu and selected by scrolling through the available setpoint
options using the UP ARROW key.
4. Enter the desired value or word into the controller by pressing the ENTER key.
Stated another way, once the desired set screen is reached, editing is accomplished by
pressing the ENTER key until the desired field is selected within the set screen. This
field is indicated by the cursor blinking on it. The arrow keys will then operate as
defined below.
CANCEL Reset the current field to the value it had when editing began.
DEFAULT Set value to original factory setting.
INCREMENT Increase the value or select the next item in a list.
DECREMENT Decrease the value or select the previous item in a list.
During edit mode, the display shows a two-character-wide menu pane on the right as
shown below. These characters relate to the functions shown above. After a field has
been set to the desired new values, press ENTER. This enters the value and scrolls to
the next field.
SET UNIT SPs (X) <D
(data) <C
(data) <+
(data) <-
Additional fields can be edited by pressing the ENTER key until the desired field is
selected.
Two four-digit passwords provide OPERATOR and MANAGER levels of access to
setpoints. The passwords are preprogrammed into the controller. The Operator
Password is 0100, the Manager Password is 2001. Either password must be entered
using the ENTER PASSWORD screen (15) before a protected setting can be changed.
This screen can be accessed either through the SET OTHER menu, or by simply
pressing the ENTER key while on one of the SET screens. The controller will
automatically go from the screen with the setting change to this screen. After the
correct password has been entered, the controller will automatically return to the
original set screen.
Once a password has been entered, it remains valid for 15 minutes after the last keypress.
SET UNIT SPs (1)
Unit Enable=OFF
Mode=COOL
Source=KEYPAD
Unit Enable is an external signal, or a keypad setting, that keeps the unit off when the
setting is OFF, and allows it to run if there is a call for cooling when the setting is ON.
The source for the signal is selected in the 4
th
line and can be:
1. KEYPAD, in which case the selection is made in line 2 and would be normally
selected as ON. This is the normal setting when no external signals are controlling
the unit.
2. DIGITAL INPUT, in which an external switch is wired across terminals #52 and
#72. (See wiring diagram page 50).
3. BAS, used with BAS signal.
IOMM AGZ-5 AGZ 026B through 130B 85
Unit Mode settings can be:
1. COOL, normal setting used with chilled water air-condition applications.
2. COOL w/GLYCOL, used with low temperature glycol applications. It allows a
lower LWT setpoint to be used.
3. ICE w/GLYCOL, used with ice storage systems, allows changing from chilled
glycol operation to lower temperature ICE operation. In ICE, the unit runs at full
load until the ICE setpoint is reached, at which time the unit shuts off. A threeposition switch wired to terminals #28 and #38 initiates the change from glycol
cooling to making ice. (See wiring diagram on page 50.)
4. TEST, for use by service technician for certain test procedures.
SET UNIT SPs (2)
Available Modes
=COOL w/Glycol
Set w/ FP Switch Off
Available Modes settings can be COOL, COOL w/Glycol, ICE w/Glycol, or TEST as
selected from the available modes imbedded in the menu. The 4
that the ON/OFF switch on the front panel (FP) must be in the OFF position before the
MODE can be changed. This prevents a mode change while the unit is operating.
th
line is a reminder
SET UNIT SPs (3)
Evap LWT = XX.X°°°°F
Ice LWT = XX.X°°°°F
SET UNIT SPs (4)
EvapDeltaT= XX.X°°°°F
StartDelta= XX.X°°°°F
Stop Delta = XX.X°°°°F
See the Compressor Control section beginning on page 61 for explanation.
SET UNIT SPs (5)
Max Pulldn=X.X°°°°F/min
Evap Recirc=XXX sec
LowAmbLock= XX.X°°°°F
SET UNIT SPs (6)
Demand Limit=No
Multipoint Power=No
SET UNIT SPs (7)
CLOCK
dd/mmm/yyyy
hh:mm:weekday
86 AGZ 026B through 130B IOMM AGZ-5
SET UNIT SPs (8)
Units = °°°°F/psi
Lang = ENGLISH
Units settings are only °F/psi at the present time. °C/kPa will be available later.
Lang (Language) settings can be only ENGLISH at present.
SET UNIT SPs (9)
Protocol = MODBUS
Ident Number=001
Baud Rate=9600
SET UNIT SPs (10)
Evap Pressure Sensor
Cir1 Offset= XX.Xpsi
Cir2 Offset= XX.Xpsi
The pressure offsets on menus 10 and 11 and the temperature offsets on menus 12, 13
and 14 correct the controller's display of the parameters. The sensors used in these
units have a high degree of repeatability but may need initial correction (offset). An
accurate pressure gauge or thermometer is used to determine the correct temperature or
pressure. A positive or negative offset value is then entered to make the controller
reading agree with the measured value.
SET UNIT SPs (11)
Cond Pressure Sensor
Cir1 Offset= XX.Xpsi
Cir2 Offset= XX.Xpsi
SET UNIT SPs (12)
Suction Temp Sensor
Cir 1 Offset= XX.XoF
Cir 2 Offset= XX.XoF
SET UNIT SPs (13)
Leaving Evaporator
Water Temp Sensor
Offset= XX.XoF
SET UNIT SPs (14)
Outside Ambient
Temperature Sensor
Offset= XX.XoF
IOMM AGZ-5 AGZ 026B through 130B 87
SET UNIT SPs (15)
ENTER PASSWORD XXXX
Active Password
Level:None
SET COMP SETPOINTS
SET COMP SPs (1)
# of Compressors =X
Stop-Start =XXmin
Start-Start =XXmin
This menu sets the anti-recycle timers. Stop-Start is the time required before starting a
compressor after it has stopped. Start-Start is the time required before starting a
compressor after the last time it has started. It is recommended that these default
values not be changed.
SET COMP SPs (2)
InterStageUp=XXXsec
InterStageDn=XXXsec
Clear Cycle Tmrs =no
InterStageUp is the time delay since the last stage change before a compressor can
stage on.
InterStageDn is the time delay since the last stage change before a compressor can
stage off normally (not by an alarm).
SET LIMIT ALARMS
SET ALARM LMTS (1)
LowEvPrHold=XXXpsi
LowEvPrUnld=XXXpsi
The LowEvPrHold and LowEvPrUnld have the same default value of 59 psi. If two
compressors are running, the LowEvPrUnld is in effect and the lag compressor will be
shut off to unload the unit. If one compressor is running, the LowEvPrHold is in effect
and the lag compressor is prevented from starting, thereby holding the unit capacity.
SET ALARM LMTS (2)
Evap Freeze= XX.X°°°°F
EvapFlowProof=XXXsec
Evap Freeze (the unit freeze protection shutdown) is actually a stop alarm and shuts off
the unit when the LWT reaches 36°F. It is cleared by going to the CLEAR ALARM
menu in the ACTIVE ALARM hierarchy.
EvapFlowProof is a time delay on the flow switch trip that reduces nuisance low flow
trips. The default setting is 5 seconds.
88 AGZ 026B through 130B IOMM AGZ-5
SET ALARM LMTS (3)
HighCondPr = XXXpsi
HiCondStgDn = XXXpsi
HighCondPr (the unit high-discharge-pressure shutdown) is a stop alarm that shuts off
the unit when the discharge pressure reaches the setting. The default setting is 385 psi.
The HiCondStDn is a limit alarm that unloads the unit in an attempt to prevent total
shutdown from the HighCondPr. The stage down is set at 370 psi.
SET ALARM LMTS (4)
PhaseVoltage=YES/NO
GroundFault=YES/NO
SET FAN STAGES
SET FANS SPs (1)
Number of Fans = X
Fan VFD = YES/NO
The Number of Fans line tells the controller the number of fans on the unit. The UP
ARROW toggles between 4, 6 and 8.
Fan VFD tells the controller whether the optional low ambient fan VFD is installed in
the unit. The UP ARROW toggles between YES and NO. The setting changes the
range available: YES = -2°F to 60°F, NO = 35°F to 60°F.
SET FANS SPs (2)
Stg Up Deadband(°°°°F)
Stg2 Stg3 Stg4
XX.X XX.X XX.X
SET FANS SPs (3)
Stg Dn Deadband(°°°°F)
Stg0 Stg1 Stg2 Stg3
XX.X XX.X XX.X XX.X
SET FANS SPs (4)
VFD Min Speed= XX%
VFD Max Speed= XXX%
SET FANS SPs (5)
Cond Sat Temp Target
Setpoint= XXX.X °°°°F
IOMM AGZ-5 AGZ 026B through 130B 89
SET FANS SPs (6)
# Fans On At Startup
>75°°°°F >90°°°°F >105°°°°F
123
Screen Definitions – TEST
The field test screens are only available when the unit is in TEST mode. Using these
screens, any digital output can be controlled manually.
TEST UNIT (1)
Alarm Signal=Off
EvapWaterPump=Off
TEST UNIT (2)
Liq Line Sol 1=Off
Compressor HG1=Off
1=Off 3=Off 5=Off
TEST UNIT (3)
Liq Line Sol 2=Off
Compressor HG2=Off
2=Off 4=Off 6=Off
TEST UNIT (4)
Fan 1= Off
Fan 3= Off
Fan 5/7= Off
TEST UNIT (5)
Fan 2= Off
Fan 4= Off
Fan 6/8= Off
TEST UNIT (6)
Fan VFD 1= 000.0%
Fan VFD 2= 000.0%
90 AGZ 026B through 130B IOMM AGZ-5
Startup
Pre Start-up
The chiller must be inspected to ensure no components became loose or damaged
during shipping or installation.
Start-Up
Refer to the MicroTech II Controller section beginning on page 54 to become familiar
with its operation before starting chiller.
There should be adequate building load (at least 50 percent of the unit full load
capacity) to properly check the operation of the chiller refrigerant circuits.
Be prepared to record all operating parameters required by the “Compressorized
Equipment Warranty Form”. Return this information within 10 working days to
McQuay International as instructed on the form to obtain full warranty benefits.
1. Verify chilled water flow.
2. Verify remote start / stop or time clock has requested the chiller to start.
3. Set the chilled water setpoint to the required temperature. (The system water
temperature must be greater than the total of the leaving water temperature setpoint
plus one-half the control band before the MicroTech II controller will stage on
cooling.)
4. Set the Evap Delta T and the Start Delta T as a starting point.
5. Put both pumpdown switches (PS1 and PS2) to the ON position.
6. Put system switch (S1) to ON position.
Switch
PS1, PS2,
Pumpdown
Switches
S1,
System Switch
Circuits will operate in the
normal automatic mode
Unit will operate in the
normal automatic mode
ON OFF
7. There may be a delay of 2 minutes after closing S1. The time delay is due to the
compressor inherent motor protection or the Stage Up Timer counting. This should
only occur on initial start-up or when power to the chiller has been turned off and
back on. More than one compressor will not start at the same time.
8. After the chiller has been operating for a period of time and has become stable,
check the following:
S Compressor oil level. (Some scroll compressors do not have oil sight glasses.)
S Refrigerant sight glass for flashing
S Rotation of condenser fans
9. Complete the “Compressorized Equipment Warranty Form”.
Switch Position
Circuit will go through the
normal pumpdown cycle and
shut off.
Unit will shut off immediately
without pumping down
(emergency stop)
IOMM AGZ-5 AGZ 026B through 130B 91
Shutdown
Temporary
1. Put both circuit switches to the OFF position (Pumpdown and Stop).
2. After compressors have stopped, put System Switch (S1) to OFF (emergency stop).
3. Turn off chilled water pump. Chilled water pump to operate while compressors are
pumping down.
To start the chiller after a temporary shutdown, follow the start-up instructions.
Extended
1. Front seat both condenser liquid line service valves.
2. Put both circuit switches to the OFF position (Pumpdown and Stop position).
3. After the compressors have stopped, put System Switch (S1) to the OFF position
(emergency stop).
4. Front seat both refrigerant circuit discharge valves (if applicable).
5. If chilled water system is not drained, maintain power to the evaporator heater to
prevent freezing. Maintain heat tracing on the chilled water lines.
6. Drain evaporator and water piping to prevent freezing.
7. If electrical power to the unit is on, the compressor crankcase heaters will keep the
liquid refrigerant out of the compressor oil. This will minimize start-up time when
putting the unit back into service. The evaporator heater will be able to function.
8. If electrical power is off, make provisions to power the evaporator heater (if chilled
water system is not drained). Tag all opened electrical disconnect switches to warn
against start-up before the refrigerant valves are in the correct operating position.
At start-up, electrical power must be on for 24 hours before starting the chiller.
To start the chiller after an extended shutdown, follow the prestart-up and start-up
instructions.
Water Piping Checkout
1. Check the pump operation and vent all air from the system.
2. Circulate evaporator water, checking for proper system pressure and evaporator
pressure drop. Compare the pressure drop to the evaporator water pressure drop
curve.
3. Clean all water strainers before placing the chiller into service.
Refrigerant Piping Checkout
1. Check all exposed brazed joints for evidence of leaks. Joints may have been
damaged during shipping or when the unit was installed.
2. Check that all refrigerant valves are either opened or closed as required for proper
operation of the chiller.
3. A thorough leak test must be done using an approved electronic leak detector.
Check all valve stem packing for leaks. Replace all refrigerant valve caps and
tighten.
4. Check all refrigerant lines to insure that they will not vibrate against each other or
against other chiller components and are properly supported.
5. Check all flare connections and all refrigerant threaded connectors.
6. Look for any signs of refrigerant leaks around the condenser coils and for damage
during shipping or installation.
92 AGZ 026B through 130B IOMM AGZ-5
7. Leak detector is applied externally to refrigerant joints at the factory. Do not
confuse this residue with an oil leak.
8. Connect refrigerant service gauges to each refrigerant circuit before starting unit.
Electrical Check Out
CAUTION
Electrical power must be applied to the compressor crankcase heaters 24 hours before
starting unit to drive off refrigerant from the oil.
1. Open all electrical disconnects and check all power wiring connections. Start at
the power block and check all connections through all components to and including
the compressor terminals. These should be checked again after 3 months of
operation and at least yearly thereafter.
2. Check all control wiring by pulling on the wire at the spade connections and
tighten all screw connections. Check plug-in relays for proper seating and to
insure retaining clips are installed.
3. Put System Switch (S1) to the Emergency Stop position.
4. Put both circuit #1 & #2 switches to the Pumpdown and Stop position.
5. Apply power to the unit. The panel Alarm Light will stay on until S1 is closed.
Ignore the Alarm Light for the check out period. If you have the optional Alarm
Bell, you may wish to disconnect it.
6. Check at the power block or disconnect for the proper voltage and proper voltage
between phases. Check power for proper phasing using a phase sequence meter
before starting unit.
7. Check for 120Vac at the optional control transformer and at TB-2 terminal #1 and
the neutral block (NB).
8. Check between TB-2 terminal #7 and NB for 120Vac supply for transformer #2.
9. Check between TB-2 terminal #2 and NB for 120Vac control voltage. This
supplies the compressor crank case heaters.
10. Check between TB-3 terminal #17 and #27 for 24Vac control voltage.
Operation
Hot Gas Bypass (Optional)
This option allows the system to operate at lower loads without the ON-OFF cycling of
the compressor. When the hot gas bypass option is used, it is required to be on both
refrigerant circuits because of the lead / lag feature of the controller.
This option allows passage of discharge gas into the evaporator inlet (between the TX
valve and the evaporator) which generates a false load to supplement the actual chilled
water load.
Note: The hot gas bypass valve cannot be used to generate a 100% false load.
The valve that is supplied can provide a load of approximately 10 tons. The system
load added to the ten tons of the hot gas bypass valve has to exceed the compressor
capacity for stage 1 compressors for stable system operation. This requires 3-6 tons of
system load.
IOMM AGZ-5 AGZ 026B through 130B 93
A solenoid valve in the hot gas bypass lines is wired in parallel with both circuit’s
liquid line solenoid valves SV1 and SV2. The hot gas bypass is available whenever a
refrigerant circuit is operating and regulates the evaporator pressure. The pressure
regulating valve is factory set to begin opening at 58 psig (32°F for R-22).
WARNING
The hot gas line may become hot enough to cause injury.
Be careful during valve checkout.
VFD Low Ambient Control (Optional)
The optional VFD fan control is used for unit operation below 35°F (2°C) down to a
mini mum o f 0 °F (-17°C). The control looks at the saturated discharge temperature and
varies the fan speed to hold the temperature (pressure) ) at the “target” temperature.
This temperature is established as an input to a setpoint screen labeled “Sat Condenser
Temp Target”.
Filter-Driers
Each refrigerant circuit is furnished with a full flow filter drier (AGZ 026 – 070) or a
replaceable core type filter-drier (AGZ 075 – 130). The core assembly of the
replaceable core drier consists of a filter core held tightly in the shell in a manner that
allows full flow without bypass.
Pressure drop across the filter drier at full load conditions must not exceed 10 psig at
full load. See page 98 for maximum pressure drop at other load points. Replace the
filter drier if the pressure drop exceeds maximum.
WARNING
Pump out refrigerant before removing end flange for replacement of core(s) to remove
liquid refrigerant and lower pressure to prevent accidental blow off of cover. EPA
recovery regulations apply to this procedure.
A condenser liquid line service valve is provided for isolating the charge in the
condenser, but also serves as the point from which the liquid line can be pumped out.
With the line free of refrigerant, the filter-drier core(s) can be easily replaced.
System A djustment
To maintain peak performance at full load operation, the system superheat and liquid
subcooling may require adjustment. Read the following subsections closely to
determine if adjustment is required.
Liquid Line Sight Glass
The color of the moisture indicator is an indication of the dryness of the system and is
extremely important when the system has been serviced. Immediately after the system
has been opened for service, the element may indicate a wet condition. It is
recommended that the equipment operate for about 12 hours to allow the system to
reach equilibrium before deciding if the system requires a change of drier cores.
Bubbles in the sight glass at constant full load indicates a shortage of refrigerant, a
plugged filter-drier, or a restriction in the liquid line. However, it is not unusual to see
bubbles in the sight glass during changing load conditions.
94 AGZ 026B through 130B IOMM AGZ-5
Refrigerant Charging
Liquid line subcooling at the liquid shut-off valve should be between 15 and 20 degrees
F at full load. If the unit is at steady full load operation and bubbles are visible in the
sight glass, then check liquid subcooling.
Thermostatic Expansion Valve
The expansion valve performs one specific function. It keeps the evaporator supplied
with the proper amount of refrigerant to satisfy the load conditions.
The sensing bulb of the expansion valve is installed in the closest straight run of
suction line from the evaporator. The bulb is held on by clamps around the suction line
and is insulated to reduce the effect of surrounding ambient temperatures. In case the
bulb must be removed, simply slit the insulation on each side of the bulb, remove the
clamps and then remove the capillary tubing that runs along the suction line from the
valve. The power element is removable from the valve body.
NOTE: Before adjusting superheat, chec k that unit charge is corr ect and liquid line sight
glass is full with no bubbles and that the circuit is operating under stable, full load
conditions.
The suction superheat for the suction leaving the evaporator is set at the factory for 8 to
12 degrees F at full load. To have full rated unit performance, the superheat must be
about 8 degrees F at 95°F outdoor ambient temperature.
Crankcase Heaters
The scroll compressors are equipped with externally mounted band heaters located at
the oil sump level. The function of the heater is to keep the temperature in the
crankcase high enough to prevent refrigerant from migrating to the crankcase and
condensing in the oil during off-cycle.
Power must be supplied to the heaters 24 hours before starting the compressors.
Evaporator
Models AGZ 026 through 070
The evaporator is a compact, high efficiency, single or dual circuit, brazed plate-toplate type heat exchanger consisting of parallel stainless steel plates.
The evaporator is protected with an electric resistance heater and insulated with 3/4"
(19mm) thick closed-cell polyurethane insulation. This combination provides freeze
protection down to -20°F (-29°C) ambient air temperature.
The water side working pressure is 363 psig (2503 kPa). Evaporators are designed and
constructed according to, and listed by, Underwriters Laboratories (UL).
Models AGZ 075 through 130
The evaporator is direct expansion, shell-and-tube type with water flowing in the
baffled shell side and refrigerant flowing through the tubes. Two independent
refrigerant circuits within the evaporator serve the unit's dual refrigerant circuits.
The evaporator is wrapped with an electric resistance heater cable and insulated with
3/4" (19mm) thick vinyl nitrate polymer sheet insulation, protecting against water
freeze-up at ambient air temperatures to -20°F (-29°C). An ambient air thermostat
controls the heater cable. The fitted and glued-in-place insulation has a K factor of
0.28 Btu in/hr ft
The refrigerant (tube) side maximum working pressure is 300 psig (2068 kPa). The
water side working pressure is 152 psig (1048 kPa). Each evaporator is designed,
constructed, inspected, and stamped according to the requirements of the ASME Boiler
and Pressure Vessel Code. Double thickness insulation is available as an option.
2
°F at 75°F.
IOMM AGZ-5 AGZ 026B through 130B 95
Unit Maintenance
General
On initial start-up and periodically during operation, it will be necessary to perform
certain routine service checks. Among these are checking the liquid line sight glasses,
taking condensing and suction pressure readings, and checking to see that the unit has
normal superheat and subcooling readings. A recommended maintenance schedule is
located at the end of this section.
Compressor Maintenance
The scroll compressors are fully hermetic and require no maintenance other than
checking oil level.
Lubrication
No routine lubrication is required on AGZ units. The fan motor bearings are
permanently lubricated and no further lubrication is required. Excessive fan motor
bearing noise is an indication of a potential bearing failure.
Compressor oil should be standard refrigeration mineral oil such as Suniso 3GS.
Electrical Terminals
Electric shock hazard. Turn off all power before continuing with following service.
WARNING
Condensers
The condensers are air-cooled and constructed of 3/8" (9.5mm) O.D. internally finned
copper tubes bonded in a staggered pattern into louvered aluminum fins. Maintenance
consists primarily of the routine removal of dirt and debris from the outside surface of
the fins and repairing any fin damage. McQuay recommends the use of foaming coil
cleaners available at most air conditioning supply outlets. Use caution when applying
such cleaners as they can contain potentially harmful chemicals. Care should be taken
not to damage the fins during cleaning. The coils should be thoroughly rinsed to
remove any cleaner residue.
If the service technician determines that the refrigerant circuit contains
noncondensables, recovery can be required, strictly following Clean Air Act
regulations governing refrigerant discharge to the atmosphere. The Schrader purge
valve is located on the vertical coil headers on both sides of the unit at the end opposite
the control box. Decorative panels cover the condenser coils and must be removed for
servicing. Recover with the unit off, after a shutdown of 15 minutes or longer, to allow
air to collect at the top of the coil. Restart and run the unit for a brief period. If
necessary, shut the unit off and repeat the procedure. Follow accepted environmentally
sound practices when removing refrigerant from the unit.
Optional High Ambient Control Panel
Consists of exhaust fan with rain hood, two inlet screens with filters, necessary
controls and wiring to allow operation to 125°F (52°C). The option can be factory or
field installed as a kit. Must be used for:
• Ambient temperatures above 105°F (40°C) with fan VFD (low ambient option).
• Ambient temperatures above 115°F (46°C) with standard FanTrol control.
• Check inlet filters periodically and clean as required. Verify that the fan is
operational.
96 AGZ 026B through 130B IOMM AGZ-5
Liquid Line Sight Glass
The refrigerant sight glasses should be observed periodically. (A weekly observation
should be adequate.) A clear glass of liquid indicates that there is subcooled refrigerant
charge in the system. Bubbling refrigerant in the sight glass, during stable run
conditions, indicates that the system can be short of refrigerant charge. Refrigerant gas
flashing in the sight glass could also indicate an excessive pressure drop in the liquid
line, possibly due to a clogged filter-drier or a restriction elsewhere in the liquid line.
See Table 45 for maximum allowable pressure drops. If subcooling is low, add charge
to clear the sight glass. If subcooling is normal (15 to 20 degrees F) and flashing is
visible in the sight glass, check the pressure drop across the filter-drier. Subcooling
should be checked at full load with 70°F (21.1°C) outdoor air temperature, stable
conditions, and all fans running.
An element inside the sight glass indicates the moisture condition corresponding to a
given element color. If the sight glass does not indicate a dry condition after about 12
hours of operation, the circuit should be pumped down and the filter-drier changed or
verify moisture content by performing an acid test on the compressor oil.
Preventive Maintenance Schedule
OPERATION WEEKLY
General
Complete unit log and review (Note 3) X
Visually inspect unit for loose or damaged components X
Inspect thermal insulation for integrity X
Clean and paint as required X
Electrical
Check terminals for tightness, tighten as necessary X
Clean control panel interior X
Visually inspect components for signs of overheating X
Verify compressor heater operation X
Test and calibrate equipment protection and operating controls X
Megger compressor motor * X
Refrigeration
Leak test X
Check sight glasses for clear flow X
Check filter-drier pressure drop (see manual for spec) X
Perform compressor vibration test X
Acid test oil sample X
Condenser (air-cooled)
Clean condenser coils (Note 4) X
Check fan blades for tightness on shaft (Note 5) X
Check fans for loose rivets and cracks X
Check coil fins for damage X
MONTHLY
(Note 1)
Notes:
1. Monthly operations include all weekly operations.
2. Annual (or spring start-up) operations inc ludes all weekly and monthly operations.
3. Log readings can be taken daily for a higher l evel of unit observation.
4. Coil cleaning can be required more frequently in areas with a high level of airborne particles.
5. Be sure fan motors are electrically locked out.
* Never Megger motors while they are in a vacuum.
ANNUAL
(Note 2)
IOMM AGZ-5 AGZ 026B through 130B 97
Service
WARNING
Service on this equipment is to be performed by qualified refrigeration personnel
familiar with equipment operation, maintenance, correct servicing procedures, and the
safety hazards inherent in this work. Causes for repeated tripping of equipment
protection controls must be investigated and corrected.
Disconnect all power before doing any service inside the unit.
Anyone servicing this equipment shall comply with the requirements set forth by the
EPA in regards to refrigerant reclamation and venting.
Filter-Driers
A replacement of the filter-drier is recommended any time excessive pressure drop is
read across the filter-drier and/or when bubbles occur in the sight glass with normal
subcooling. The maximum recommended pressure drops across the filter-drier are as
follows:
Table 45, Filter-Drier Pressure Drop
PERCENT CIRCUIT
LOADING (%)
100% 10 (69)
75% 8 (55.2)
50% 5 (34.5)
25% 4 (27.6)
MAXIMUM RECOMME N D ED PRESSU R E
DROP ACROSS FILTER DRIE R PSIG (KPA)
The filter-drier should also be changed if the moisture indicating liquid line sight glass
indicates excess moisture in the system.
During the first few months of operation the filter-drier replacement can be necessary if
the pressure drop across the filter-drier exceeds the values listed in the paragraph
above. Any residual particles from the condenser tubing, compressor and
miscellaneous components are swept by the refrigerant into the liquid line and are
caught by the filter-drier.
Liquid Line Solenoid Valve
The liquid line solenoid valves that shut off refrigerant flow in the event of a power
failure do not normally require any maintenance. The solenoids can, however, require
replacement of the solenoid coil or of the entire valve assembly.
The solenoid coil can be checked to see that the stem is magnetized when energized by
touching a screwdriver to the top of the stem. If there is no magnetization, either the
coil is bad or there is no power to the coil.
The solenoid coil can be removed from the valve body without opening the refrigerant
piping after pumpdown. For personal safety, shut off and lock out the unit power.
The coil can then be removed from the valve body by simply removing a nut or snapring located at the top of the coil. The coil can then be slipped off its mounting stud for
replacement.
To replace the entire solenoid valve follow the steps involved when changing a filterdrier.
98 AGZ 026B through 130B IOMM AGZ-5
Evaporator
The evaporators are the direct expansion, shell-and-tube type with refrigerant flowing
through the tubes and water flowing through the shell over the tubes or stainless steel
brazed-plate type. The tubes are internally finned to provide extended surface as well
as turbulent flow of refrigeration through the tubes. Other than cleaning and testing, no
service work should be required on the evaporator.
Refrigerant Charging
AGZ air-cooled chillers are shipped factory charged with a full operating charge of
refrigerant but there can be times that a unit must be recharged at the job site. Follow
these recommendations when field charging. Refer to the unit operating charge found
in the Physical Data Tables.
Unit charging can be done at any steady load condition (preferably at 75 to 100% load)
and at any outdoor temperature (preferably higher than 70°F (21.1°C). Unit must be
allowed to run 5 minutes or longer so that the condenser fan staging is stabilized at
normal operating discharge pressure. For best results, charge with two or more
condenser fans operating on each refrigerant circuit.
The AGZ units have a condenser coil design with approximately 15% of the coil tubes
located in a subcooler section of the coil to achieve liquid cooling to within 5°F (3°C)
of the outdoor air temperature when all condenser fans are operating. This is equal to
15°F to 20°F (8.3°C to 11.1°C) subcooling below the saturated condensing temperature
when the pressure is read at the liquid valve between the condenser coil and the liquid
line filter-drier. Once the subcooler is filled, extra charge will not lower the liquid
temperature and does not help system capacity or efficiency.
One of the following three scenarios will be experienced with an undercharged
unit:
1. If the unit is slightly undercharged, the unit will show bubbles in the sight glass.
Recharge the unit as described in the charging procedure below.
2. If the unit is moderately undercharged, it will normally trip on freeze protection.
Recharge the unit as described in the charging procedure below. However,
freezestat trips can also be an indication of low flow or poor heat transfer due to
tube fouling. Anti-freeze solutions can also cause freezestat trips.
3. If the unit is severely undercharged, the unit will trip due to lack of liquid flow to
the expansion valve. In this case either remove the remaining charge by means of a
proper reclamation system and recharge the unit with the proper amount of
refrigerant as stamped on the unit nameplate, or add refrigerant through the suction
valve on the compressor. If the unit is severely undercharged, the unit can nuisance
trip during this charging procedure. If this happens, operate the unit at minimum
load, adding charge until the sight glass is clear. Once the unit has enough charge
so that it does not trip out, continue with step 2 of the charging procedure below.
IOMM AGZ-5 AGZ 026B through 130B 99
Procedure to charge a moderately undercharged AGZ unit:
1. If a unit is low on refrigerant, you must first determine the cause before attempting
to recharge the unit. Locate and repair any refrigerant leak. Evidence of oil is a
good indicator of leakage, however, oil may not be visible at all leaks. Liquid leak
detector fluids work well to show bubbles at medium size leaks but electronic leak
detectors can be needed to locate small leaks.
2. Add the charge to the system through the suction shutoff valve or through the
Schrader fitting on the tube entering the evaporator between the compressor and
the evaporator head.
3. The charge can be added at any load condition between 25-100% load per circuit
but at least two fans should be operating per refrigerant circuit, if possible. The
suction superheat should be in the 8 to 12 degree F (4.4°C-6.6°C) range.
4. Add sufficient charge to clear the liquid line sight glass and until all flashing stops
in the sight glass.
5. Check the unit subcooling value by reading the liquid line pressure and
temperature at the liquid line near the filter-drier. The subcooling values should be
between 15 and 20 degrees F (8.3 and 11.1 degrees C).
6. With outdoor temperatures above 60°F (15.6°C), all condenser fans should be
operating and the liquid line temperature should be within 5°F to 10°F (2.8°C to
5.6°C) of the outdoor air temperature. At 25-50% load, the liquid line temperature
should be within 5°F (2.8°C) of outdoor air temperature with all fans on. At 75100% load the liquid line temperature should be within 10°F (5.6°C) of outdoor air
temperature with all fans on.
7. Overcharging of refrigerant will raise the compressor discharge pressure due to
filling of the condenser tubes with excess refrigerant.
Warranty Statement
Limited Warranty
Consult your local McQuay Representative for warranty details. Refer to Form 93343285Y. To find your local McQuay Representative, go to www.mcquay.com.
100 AGZ 026B through 130B IOMM AGZ-5
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