Air-Cooled Scroll Compressor Chiller Installation, Operation and Maintenance Manual 60 Hertz, R-22

Air-Cooled Scroll Compressor Chiller Installation, Operation and Maintenance Manual 60 Hertz, R-22
Installation, Operation and Maintenance Manual
IOMM AGZ-5
Group: Chiller
Part Number: 330411801
Effective: October 2004
Supercedes: IOMM AGZ-4
Air-Cooled Scroll Compressor Chiller
AGZ 026B through 130B
60 Hertz, R-22
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
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 Adjustment .................................... 94
Liquid Line Sight Glass ............................. 94
Refrigerant Charging ................................. 95
Thermostatic Expansion Valve .................. 95
Crankcase Heaters ..................................... 95
Evaporator ................................................. 95
Unit Maintenance.............................96
Electrical Data - High Ambient...... 43
Preventive Maintenance Schedule ............. 97
Dimensional Data ............................ 51
Service...............................................98
MicroTech II Controller ................. 54
Liquid Line Solenoid Valve ....................... 98
Evaporator ................................................. 99
Refrigerant Charging ................................. 99
Controller Section Table of Contents .........54
Overview ....................................................55
General Description....................................55
Logging ......................................................59
Control Logic .............................................60
Chilled Water Pump Control ......................61
Warranty Statement ......................100
AGZ Troubleshooting Chart.........101
This manual also replaces
IOMM AGR-1
Our facility is ISO Certified
"McQuay" is a registered trademark of McQuay International
2002 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.
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
Application
S= Standard Cooling
M= Remote Evaporator
Air-Cooled
IOMM AGZ-5
Global
Design Vintage
Scroll Compressor
Model Size
(Nominal Tons)
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
Spreader bars
required
(use caution)
Number of fans may vary
from this diagram. The lifting
method will remain the same.
All rigging locations
must be used.
4
AGZ 026B through 130B
IOMM AGZ-5
Location
Figure 3, Clearances
Unit Placement
AGZ units are for outdoor applications and
can be mounted either on a roof or at ground
level. For roof mounted applications, install
the unit on a steel channel or I-beam frame to
FT. (1220mm)
support the unit above the roof. For ground 4CLEARANCE
FOR
level applications, install the unit on a 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)
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.
SEE ATTACHED TABLE
DIMENSION “A”
4 FT. (1220)
CLEARANCE FOR
SERVICE ACCESS
SEE ATTACHED TABLE
DIMENSION “A”
Table 1, Recommended Minimum Clearances
Model Size
026B – 070B
075B – 130B
Coil Side “A”
ft (m)
4 (1.2)
6 (1.8)
“B”
ft (m)
8 (2.4)
12 (3.6)
“C”
ft (m)
6 (1.8)
8 (2.4)
End Opposite
Controls ft (m)
4 (1.2)
4 (1.2)
Control Panel End
ft. (m)
4 (1.2)
4 (1.2)
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.
IOMM AGZ-5
AIR
DISCHARGE
AIR
DISCHARGE
AIR FLOW
AIR FLOW
AIR FLOW
“B”
The recommended minimum side clearance between two units
is dimension “B’ in table on this page.
AIR
DISCHARGE
AIR FLOW
AIR FLOW
“C”
“C”
The unit must not be installed in a pit or enclosure 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 table on this page.
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.
Building
Figure 4, Coil and Fan Arrangement
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
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
D
Figure 6, Adjustment Factors
AGZ
AGZ
075-130 026-070
3.0
4.5 ft.
(1.4m)
3.5 ft.
(1.0m)
2.0
AGZ
AGZ
075-130 026-070
4.0
3.5 ft.
(1.0m)
6 ft.
(1.8m)
4 ft.
(1.2m)
8 ft.
(2.4m)
6 ft.
(1.8m)
3.0
1.0
6 ft.
(1.8m)
4 ft.
(1.2m)
.5
8 ft.
(2.4m)
6 ft.
(1.8m)
2.0
0
IOMM AGZ-5
4.5 ft.
(1.4m)
0
AGZ 026B through 130B
7
Case 2, Two Units Side By Side
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
6.0
2.0
4.0
1.0
2.0
0
8
0
9
AGZ 075-130 (2.7)
10
(3.0)
11
(3.3)
12
(3.6)
9
AGZ 075-130 (2.7)
10
(3.0)
11
(3.3)
12
(3.6)
AGZ 026-070 6.5
(2.0)
7
(2.1)
7.5
(2.2)
8
(2.4)
AGZ 026-070 6.5
(2.0)
7
(2.1)
7.5
(2.2)
8
(2.4)
AGZ 026B through 130B
IOMM AGZ-5
Case 3, Three or More Units Side By Side
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
Chiller 1
Chiller 2
Chiller 3
Figure 10, Adjustment Factor
4.0
8.0
3.0
6.0
2.0
4.0
1.0
2.0
0
0
AGZ 075-130
15
(4.6)
16
(4.9)
17
(5.2)
18
(5.5)
AGZ 075-130
15
(4.6)
16
(4.9)
17
(5.2)
18
(5.5)
AGZ 026-070
11
(3.3)
12
(3.7)
13
(4.0)
14
(4.3)
AGZ 026-070
11
(3.3)
12
(3.7)
13
(4.0)
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
AGZ
075-130
4
(1.2)
6
(1.8)
3.5
(1.0)
5
(2.0)
3.0
(0.9)
4
(1.2)
2.5
(0.7)
3
(0.9)
0
10
10
20
AGZ 026B through 130B
30
40
50
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 Installation
Figure 14, Adjustment Factor
AGZ
026-070
D=4
(1.4)
D=5
(2.0)
AGZ
026-070
D=4
(1.4)
D=5
(2.0)
AGZ
075-130
D=6
(1.8)
D=8
(2.4)
AGZ
075-130
D=6
(1.8)
D=8
(2.4)
AGZ
075-130
D=10
(3.1)
IOMM AGZ-5
AGZ
026-070
D=7
(2.1)
AGZ 026B through 130B
AGZ
075-130
D=10
(3.1)
AGZ
026-070
D=7
(2.1)
11
Sound Isolation
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.
Spring Isolator Dimensions
Neoprene-in-Shear Dimensions
Color Code
Gray
Black, Red
L
5.5
6.25
W
3.37
4.62
H
1.75
1.62
B
0.5
0.5
C
4.12
5.0
D
0.56
0.56
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
3
4
CONTROL
PANEL
4
5
6
1
2
3
CONTROL
PANEL
1
2
NOTE: 4-fan units 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
Table 2, AGZ-BS, Isolator Loads At Each Mounting Location (With Aluminum Fins)
(1) Copper
Fin Add
lb.
kg
Unit
Size
No.
of
Fans
lb
kg
lb
kg
lb
kg
lb
kg
lb
kg
lb
kg
lb
kg
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
1
2
3
4
5
6
Total Unit
NOTE (1): Additional weight for copper coils is per mounting location.
Table 3, Isolator Kit Numbers
AGZ
Model
Spring Kit
Part No.
R-I-S Kit
Part No.
026, 030
035
040, 045
050
055
060
065, 070
075, 085
090
100
110
120,130
330349603
330349603
330349605
330349606
330349607
330349609
330349612
330349613
330349614
330349702
330349703
330349704
330349704
330349705
330349706
330349707
330349708
330349709
Table 4, Isolator Locations
AGZ-B, Chillers
Unit
Size
Operating Weight.
Neoprene-In-Shear Mountings
Spring-Flex Mountings
lbs
kg
1
2
3
4
5
6
1
2
3
4
5
6
026B
3990
1807
Black
Gray
Gray
Gray
-
-
Orange
Purple
Purple
Red
-
-
030B
4040
1830
Black
Gray
Gray
Gray
-
-
Orange
Purple
Purple
Red
-
-
035B
4080
1848
Black
Gray
Gray
Gray
-
-
Orange
Purple
Purple
Red
-
-
040B
4130
1871
Black
Gray
Black
Gray
-
-
Orange
Purple
Purple
Red
-
-
045B
4270
1934
Black
Gray
Black
Gray
-
-
Orange
Purple
Purple
Red
-
-
050B
4400
1993
Black
Gray
Black
Gray
-
-
Orange
Purple
Purple
Red
-
-
055B
4540
2057
Black
Black
Black
Gray
-
-
Orange
Purple
Purple
Purple
-
-
060B
4600
2084
Black
Black
Black
Gray
-
-
Orange
Purple Orange Purple
-
-
065B
4860
2202
Black
Black
Black
Black
-
-
Orange Orange Orange Purple
-
-
070B
4990
2260
Black
Black
Black
Black
-
-
Orange Orange Orange Purple
-
-
075B
6530
2958
Red
Black
Red
Black
-
-
Gray
Orange
Gray
Orange
-
-
085B
6690
3031
Red
Black
Red
Black
-
-
Gray
Orange
Gray
Orange
-
-
090B
6850
3103
Red
Black
Red
Black
-
-
Gray
Orange
Gray
Orange
-
-
100B
7870
3565
Black
Black
Black
Black
Black
Black
Orange Orange Orange Orange Orange Orange
110B
8150
3692
Red
Black
Black
Red
Black
Black
Green
Orange Orange Green Orange Orange
120B
8720
3950
Red
Red
Black
Red
Red
Black
Green
Green Orange Green
Green Orange
130B
9050
4100
Red
Red
Black
Red
Red
Black
Green
Green Orange Green
Green Orange
NOTES:
1. Neoprene-in-shear isolators: Gray=RP-3 Gray, Black=RP-4 Black, Red=RP-4 Red.
IOMM AGZ-5
AGZ 026B through 130B
13
Ambient and Water 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
Standard
Controls
w/ Low Ambient
VFD Control Option
w/ or w/o Low Ambient VFD Control
Plus High Ambient Panel Option
AGZ 026B – 130B
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.
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 be installed in the water line before the inlet of the evaporator. This will help
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.
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
T
Air
Vent
Strainer
Inlet
P
Isolation
Valves
Vibration
Eliminators
Outlet
Flow
Switch
T
Thermowell
Drain
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 Rates
Nominal Pipe Size
Inches (mm)
2 (50.8)
2 1/2 (63.50
3 (76.20
4 (101.6)
5 (127.0)
6 (152.4)
Minimum Required Flow To
Activate Switch - gpm (l/m)
13.7 (51.8)
17.9 (67.8)
24.2 (91.6)
35.3 (134.0)
48.6 (184.0)
60.3 (228.0)
Maximum Safe Flow Rate
gpm (l/m)
105 (397.4)
149 (564.0)
230 (870.6)
397 (1502.7)
654 (2475.4)
900 (3406.5)
Note: See pressure drop table on page 18 for minimum and maximum flow through the evaporator.
Figure 18, Flow Switch Installation
Flow direction marked on switch
1" (25mm) NPT flow switch
connection
Tee
16
AGZ 026B through 130B
IOMM AGZ-5
Water Connections
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:
Glycol Flow (gpm) =
24 × Tons Capacity ( glycol )
× Flow Correction Factor )
Delta − T
For Metric Applications – Use the following equation for metric applications:
Glycol Flow (l/s) =
kW Capacity
× Flow Correction Factor
4.18 × Delta − T
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 Table 10.
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
20
30
40
50
Freeze Point
o
F
26
18
7
-7
-28
o
C
-3.3
-7.8
-13.9
-21.7
-33.3
Capacity
Power
Flow
PD
0.998
0.993
0.987
0.980
0.973
0.998
0.997
0.995
0.992
0.991
1.036
1.060
1.092
1.132
1.182
1.097
1.226
1.369
1.557
1.791
Table 8, Propylene Glycol Factors for Models AGZ 026B to 070B
% P.G.
10
20
30
40
50
Freeze Point
o
F
26
19
9
-5
-27
o
C
-3.3
-7.2
-12.8
-20.6
-32.8
Capacity
Power
Flow
PD
0.995
0.987
0.978
0.964
0.952
0.997
0.995
0.992
0.987
0.983
1.016
1.032
1.057
1.092
1.140
1.100
1.211
1.380
1.703
2.251
Table 9, Ethylene Glycol Factors for Models AGZ 075B to 130B
% E.G.
10
20
30
40
50
Freeze Point
o
F
26
18
7
-7
-28
o
C
-3.3
-7.8
-13.9
-21.7
-33.3
Capacity
Power
Flow
PD
0.994
0.982
0.970
0.955
0.939
0.998
0.995
0.992
0.987
0.983
1.038
1.063
1.095
1.134
1.184
1.101
1.224
1.358
1.536
1.755
Table 10, Propylene Glycol Factors for Models AGZ 075B to 130B
% P.G.
10
20
30
40
50
18
Freeze Point
o
F
26
19
9
-5
-27
o
C
-3.3
-7.2
-12.8
-20.6
-32.8
Capacity
Power
Flow
PD
0.988
0.972
0.951
0.926
0.906
0.996
0.992
0.987
0.979
0.974
1.019
1.035
1.059
1.095
1.142
1.097
1.201
1.351
1.598
2.039
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
2
2
0.0001 ft × hr × ° F / BTU or (0.0176m × °C / kW ) per ARI 550/590-98.
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.
Table 11, Capacity and Power Derates, Models AGZ 026 to 070
Altitude
Sea
Level
2000 feet
4000 feet
6000 feet
IOMM AGZ-5
Fouling Factor
Chilled Water Delta T
0.0001 (0.0176)
0.00025 (0.044)
0.00075 (0.132)
0.00175 (0.308)
°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
AGZ 026B through 130B
19
Table 12, Capacity and Power Derates, Models AGZ 075 to 130
Altitude
Sea
Level
2000 feet
4000 feet
6000 feet
8000 feet
Chilled Water
Delta T
Fouling Factor
0.0001 (0.0176)
0.00025 (0.044)
0.00075 (0.132)
0.00175 (0.308)
°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
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
075-085-090
120-130
026-030
035
040
050
045
AGZ Unit
Model
026B
030B
035B
040B
045B
050B
055B
060B
065B
070B
075B
085B
090B
100B
110B
120B
130B
060
100-110
065-070
055
Minimum
Inch-Pound
S.I.
gpm
DP ft.
lps
DP kpa
41
1.6
2.6
4.7
45
1.9
2.9
5.7
50
1.9
3.1
5.6
58
1.9
3.6
5.7
64
1.8
4.0
5.4
71
1.8
4.4
5.4
78
1.8
4.9
5.3
86
1.7
5.4
5.2
92
1.6
5.8
4.9
98
1.9
6.2
5.6
111
5.6
7.0
16.5
119
6.3
7.5
18.9
128
7.2
8.1
21.4
146
2.6
9.2
7.7
161
3.1
10.2
9.2
180
3.5
11.3
10.4
194
4.1
12.2
12.1
Nominal
Inch-Pound
S.I.
gpm
DP ft.
lps
DP kpa
65
3.9
4.1
11.6
72
4.7
4.6
14.1
80
4.6
5.0
13.8
92
4.7
5.8
14.0
102
4.5
6.4
13.4
113
4.5
7.1
13.3
125
4.4
7.9
13.0
137
4.3
8.6
12.8
147
4.1
9.3
12.1
157
4.6
9.9
13.7
177
12.5
11.2
37.4
191
14.3
12.1
42.7
205
16.2
12.9
48.4
234
6.1
14.8
18.2
258
7.3
16.3
21.7
288
8.9
18.1
26.5
311
10.4
19.6
30.9
Maximum
Inch-Pound
S.I.
gpm
DP ft.
lps
DP kpa
109
10.4
6.9
30.9
121
12.7
7.6
37.8
133
12.4
8.4
36.9
154
12.6
9.7
37.5
170
12.1
10.7
35.9
188
12.0
11.9
35.7
209
11.7
13.2
34.8
228
11.5
14.4
34.2
246
10.9
15.5
32.5
262
12.3
16.5
36.8
295
30.4
18.6
90.7
318
34.8
20.1
103.6
342
39.4
21.6
117.3
390
15.5
24.6
46.2
430
18.5
27.1
55.1
479
24.6
30.2
73.4
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
proper unit control.
22
AGZ 026B through 130B
IOMM AGZ-5
Wind Baffles and Hail Guards
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 Attachment (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.
UNIT VERTICAL COIL
ATTACH ALL RIBS TO
COIL VERTICAL CHANNELS.
Front Panel Attachment (Second)
PLACE FRONT "A" AND
FASTEN TO BOTH SIDES
E
UNIT VERTICAL COIL
D
C
B
2
PLACE FRONT "B" BY LAPPING
OVER "A" AND REPEAT
ATTACHMENT PROCEDURE.
A
1
3
Top Panel Attachment (Last)
E
ATTACH TOP "A" AT HORIZONTAL COIL CHANNEL FIRST.
THIS WILL SQUARE THE PANEL.
OVERLAP THE FRONT PANEL FLANGE.
UNIT VERTICAL COIL
D
C
B
A
ATTACH LEFT SIDE SECOND.
LAP PANEL "B" OVER PANEL "A"
AND REPEAT ATTACHMENT PROCEDURE.
IOMM AGZ-5
AGZ 026B through 130B
23
Table 13, Packing List
Description
Vertical Support Rib
Top Cover
Front Panel
¼ - 20 x ½” Screw (Place in Poly Bag)
Part Number
074758501
330409401
330409501
046093807
Bubble Number
1
2
3
Figure 21, Components
TOP
REAR (AGAINST UNIT)
VERTICAL SUPPORT RIB
TOP COVER
FRONT PANEL
Top Panel, Install Last
Overlap the Front panel
Front Panel, Install Second
Rib, Install First
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
Ethernet 10 Base-T
10 Megabits/sec
MicroTech II
Reference ED 15062
BACnet MSTP
RS-485
MicroTech II
Reference ED 15062
MicroTech II
Reference ED 15062
MicroTech II
Reference ED 15063
LONWORKS

Modbus RTU
FTT-10A
RS-485 or RS-232
9600, 19200 or
38400 bits/sec
78kbits/sec
9600 or 19200
bits/sec
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.
•
•
•
•
•
•
•
IOMM AGZ-5
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.
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 under Product Information >
(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.
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
026B
BASIC DATA
Unit Capacity @ ARI (1), Tons (kW)
Number Of Refrigerant Circuits
Unit Operating Charge, R-22, Lbs.
Unit Operating Charge, R-22, (kg)
Cabinet Dimensions, LxWxH, In.
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lb (kg)
Unit Shipping Weight, Lb (kg)
Add'l Weight If Copper Finned Coils, Lb (kg)
AGZ MODEL NUMBER
030B
035B
Ckt.1
Ckt.2
Ckt.1
Ckt.2
Ckt.1
Ckt.2
27.2 (95.4)
30.2 (106.3)
33.2 (117.2)
2
2
2
22
22
22
27
27
27
10
10
10
12
12
12
94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4
2398 x 2235 x 2550 2398 x 2235 x 2550 2398 x 2235 x 2550
3990 (1811)
4040 (1834)
4080 (1852)
39501793)
3990 (1811)
4030 (1830)
284 (129)
284 (129)
284 (129)
COMPRESSORS
Type
Nominal tonnage of each Compressor
Number Of Compressors per Circuit
Oil Charge Per Compressor, Oz.
Oil Charge Per Compressor, (g)
Tandem Scrolls
7.5
7.5
2
2
140
140
(496)
(496)
Tandem Scrolls
7.5
9.0
2
2
140
140
(496)
(496)
Tandem Scrolls
9.0
9.0
2
2
140
140
(496)
(496)
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead
Staging, 4 Stages, Circuit #2 in Lead
0-25-50-75-100
0-25-50-75-100
0-23-50-73-100
0-27-50-77-100
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.
Coil Face Area, (M2)
Finned Height x Finned Length, In.
26.3
26.3
2.4
2.4
50x75.6 50x75.6
1270 x
1270 x
Finned Height x Finned Length, (mm)
1920
1920
Fins Per Inch x Rows Deep
16 x 3
16 x 3
Pumpdown Capacity, 90% Full Lbs. (kg)
49 (22)
49 (22)
Maximum Relief Valve Pressure Setting,
450
450
psig (kPa)
(3103)
(3103)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, In. (mm)
Number Of Motors - HP (kW) (2)
Fan And Motor RPM, 60Hz
60 Hz Fan Tip Speed, FPM (M/Sec)
60 Hz Total Unit Airflow, CFM (M3/sec)
4 – 30 (762)
4 – 1.5
1140
8950 (4224)
24,316 (11,478)
26.3
2.4
50x75.6
1270 x
1920
16 x 3
49 (22)
450
(3103)
26.3
26.3
2.4
2.4
50x75.6 50x75.6
1270 x 1270 x
1920
1920
16 x 3
16 x 3
49 (22) 49 (22)
450
450
(3103)
(3103)
4 – 30 (762)
4 – 1.5
1140
8950 (4224)
24,316 (11,478)
26.3
2.4
50x75.6
1270 x
1920
16 x 3
49 (22)
450
(3103)
4 – 30 (762)
4 – 1.5
1140
8950 (4224)
24,316 (11,478)
EVAPORATOR - BRAZED PLATE-TO-PLATE
Number of Evaporators
1
1
Number of Refrigerant Circuits
2
2
Water Volume, Gallons, (L)
4.3 (16.4)
5.0 (18.9)
Maximum Water Pressure, psig (kPa)
363 (2503)
363 (2503)
Max. Refrig. Working Pressure, psig (kPa)
450 (3102)
450 (3102)
Water Inlet / Outlet Victaulic Conn. In. (mm)
3 (76)
3 (76)
Drain - NPT int, In. (mm)
Field
Field
Vent - NPT int, In. (mm)
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
28
AGZ 026B through 130B
1
2
5.7 (21.4)
363 (2503)
450 (3102)
3 (76)
Field
Field
IOMM AGZ-5
Table 16, AGZ 040BS through 055BS
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW)
Number Of Refrigerant Circuits
Unit Operating Charge, R-22, lbs.
Unit Operating Charge, R-22, (kg)
Cabinet Dimensions, LxWxH, in.
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lbs. (kg)
Unit Shipping Weight, Lbs. (kg)
Add'l Weight If Copper Finned Coils, lbs. (kg)
AGZ MODEL NUMBER
045B
050B
040B
055B
Ckt.1
Ckt.1
Ckt.2
Ckt.1
Ckt.2
Ckt.1
Ckt.2
Ckt.2
38.5 (135.5)
42.5 (149.6)
47.0 (165.4)
52.2 (183.7)
2
2
2
2
31
31
38
38
38
38
46
46
(14)
(14)
(17)
(17)
(17)
(17)
(21)
(21)
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
2398 x 2235 x
2398 x 2235 x
2398 x 2235 x
2398 x 2235 x
2550
2550
2550
2550
4130 (1875)
4270 (1939)
4400 (1998)
4540 (2061)
4070 (1848)
4210 (1911)
4330 (1966)
4460 (2025)
288 (130)
288 (130)
476 (216)
476 (216)
COMPRESSORS
Type
Nominal tonnage of each Compressor
Number Of Compressors per Circuit
Oil Charge Per Compressor, oz.
Oil Charge Per Compressor, (g)
Tandem Scrolls
10.0
10.0
2
2
140
140
(496)
(496)
Tandem Scrolls
10.0
13.0
2
2
140
140
(496)
(496)
Tandem Scrolls
13.0
13.0
2
2
140
140
(496)
(496)
Tandem Scrolls
15.0
15.0
2
2
140
140
(496)
(496)
0-25-50-75-100
0-25-50-75-100
0-25-50-75-100
0-25-50-75-100
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead
Staging, 4 Stages, Circuit #2 in Lead
0-25-50-75-100
0-25-50-75-100
0-22-50-46-100
0-28-50-85-100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, sq. ft.
Coil Face Area , sq. m
Finned Height x Finned Length, in.
44.1
4.1
42x75.6
1067 x
Finned Height x Finned Length, (mm)
1920
Fins Per Inch x Rows Deep
16 x 2
Pumpdown Capacity, 90% Full Lbs. (kg)
60 (27)
450
Maximum Relief Valve Pressure Setting, psig (kPa)
(3103)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, in. (mm)
Number Of Motors - HP (kW) (2)
Fan And Motor RPM, 60Hz
60 Hz Fan Tip Speed, FPM (m/sec)
60 Hz Total Unit Airflow, CFM (m3/sec)
44.1
44.1
44.1
4.1
4.1
4.1
42x75.6 42x75.6 42x75.6
1067 x 1067 x 1067 x
1920
1920
1920
16 x 2
16 x 2
16 x 2
60 (27) 60(27)
60(27)
450
450
450
(3103)
(3103)
(3103)
4 – 30 (762)
4 – 1.5
1140
8950 (4224)
39,600 (18,692)
44.1
4.1
42x75.6
1067 x
1920
16 x 3
82 (37)
450
(3103)
44.1
44.1
44.1
4.1
4.1
4.1
42x75.6 42x75.6 42x75.6
1067 x 1067 x 1067 x
1920
1920
1920
16 x 3
16 x 3
16 x 3
82 (37) 82 (37) 82 (37)
450
450
450
(3103)
(3103)
(3103)
4 – 30 (762)
4 – 1.5
1140
8950 (4224)
39,600 (18,692)
4 – 30 (762)
4 – 1.5
1140
8950 (4224)
39,600 (18,692)
4 – 30 (762)
4 – 1.5
1140
8950 (4224)
39,600 (18,692)
1
2
7.2 (27.3)
363 (2503)
450 (3102)
3 (76)
Field
Field
1
2
8.1 (30.7)
363 (2503)
450 (3102)
3 (76)
Field
Field
1
2
9.2 (34.9)
363 (2503)
450 (3102)
3 (76)
Field
Field
EVAPORATOR - BRAZED PLATE-TO-PLATE
Number of Evaporators
1
Number of Refrigerant Circuits
2
Water Volume, Gallons, (L)
6.3 (23.9)
Maximum Water Pressure, psig (kPa)
363 (2503)
Maximum Refrigerant Working Pressure, psig (kPa)
450 (3102)
Water Inlet / Outlet Victaulic Connections, in. (mm)
3 (76)
Drain - NPT int, in. (mm)
Field
Vent - NPT int, in. (mm)
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
IOMM AGZ-5
AGZ 026B through 130B
29
Table 17, AGZ 060BS through 070BS
PHYSICAL DATA
060B
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW)
Number Of Refrigerant Circuits
Unit Operating Charge, R-22, lbs.
Unit Operating Charge, R-22, (kg)
Cabinet Dimensions, LxWxH, in.
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lbs. (kg)
Unit Shipping Weight, Lbs. (kg)
Add'l Weight If Copper Finned Coils, lbs. (kg)
AGZ MODEL NUMBER
065B
070B
Ckt.1
Ckt.2
Ckt.1
Ckt.2
Ckt.1
Ckt.2
57.1 (201.0)
61.4 (215.5)
65.5 (230.0)
2
2
2
46
46
52
59
59
59
(21)
(21)
(24)
(27)
(27)
(27)
94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4
2398 x 2235 x
2398 x 2235 x
2398 x 2235 x
2550
2550
2550
4600
4860
4990
4520
4760
4890
476 (216)
568 (258)
568 (258)
COMPRESSORS
Type
Nominal tonnage of each Compressor
Number Of Compressors per Circuit
Oil Charge Per Compressor, oz.
Oil Charge Per Compressor, (g)
Tandem Scrolls
15.0
15.0
2
2
140
140
(496)
(496)
Tandem Scrolls
Tandem Scrolls
15.0
15 / 20 15 / 20 15 / 20
2
2
2
2
140
140 /148 140 /148 140 /148
(496) 496/ 525 496/ 525 496/ 525
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead
Staging, 4 Stages, Circuit #2 in Lead
0-25-50-75-100
0-25-50-75-100
0-23-46-77-100
0-31-46-69-100
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.
Coil Face Area, (m2)
Finned Height x Finned Length, in.
44.1
4.1
42x75.6
1067 x
Finned Height x Finned Length, (mm)
1920
Fins Per Inch x Rows Deep
16 x 3
Pumpdown Capacity, 90% Full Lbs. (kg)
82 (37)
450
Maximum Relief Valve Pressure Setting, psig (kPa)
(3103)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, in. (mm)
Number Of Motors - HP (kW) (2)
Fan And Motor RPM, 60Hz
60 Hz Fan Tip Speed, FPM (m/sec)
60 Hz Total Unit Airflow, CFM (m3/sec)
44.1
52.6
52.6
52.6
52.6
4.1
4.9
4.9
4.9
4.9
42x75.6 50x75.6 50x75.6 50x75.6 50x75.6
1067 x 1270 x 1270 x 1270 x 1270 x
1920
1920
1920
1920
1920
16 x 3
16 x 3
16 x 3
16 x 3
16 x 3
82 (37) 98 (44) 98 (44) 98 (44) 98 (44)
450
450
450
450
450
(3103)
(3103)
(3103)
(3103)
(3103)
4 – 30 (762)
4 – 1.5
1140
8950 (4224)
37,228 (17,572
4 – 30 (762)
4 – 2.0
1140
8950 (4224)
43,452 (20,510)
4 – 30 (762)
4 – 2.0
1140
8950 (4224)
43,452 (20,510)
1
2
11.2 (42.5)
363 (2503)
450 (3102)
3 (76)
Field
Field
1
2
11.2 (42.5)
363 (2503)
450 (3102)
3 (76)
Field
Field
EVAPORATOR - BRAZED PLATE-TO-PLATE
Number of Evaporators
1
Number of Refrigerant Circuits
2
Water Volume, Gallons, (L)
9.2 (34.9)
Maximum Water Pressure, psig (kPa)
363 (2503)
Maximum Refrigerant Working Pressure, psig (kPa)
450 (3102)
Water Inlet / Outlet Victaulic Connections, in. (mm)
3 (76)
Drain - NPT int, in. (mm)
Field
Vent - NPT int, in. (mm)
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
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)
Number Of Refrigerant Circuits
Unit Operating Charge, R-22, lbs.
Unit Operating Charge, R-22, (kg)
Cabinet Dimensions, LxWxH, in.
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lbs. (kg)
Unit Shipping Weight, Lbs. (kg)
Add'l Weight If Copper Finned Coils, lbs. (kg)
075B
AGZ MODEL NUMBER
085B
090B
Ckt.1
Ckt.2
73.7 (259.4)
2
59
59
(27)
(27)
134.9 x 88.0 x 100.4
3426 x 2235 x 2550
6530 (2958)
6320 (2863)
870 (395)
Ckt.1
Ckt.2
79.6 (280.2)
2
59
69
(27
(31)
134.9 x 88.0 x 100.4
3426 x 2235 x 2550
6690 (3031)
6480 (2935)
870 (395)
Ckt.1
Ckt.2
85.5 (301.0)
2
69
69
(31)
(31)
134.9 x 88.0 x 100.4
3426 x 2235 x 2550
6850 (3103)
6640 (3008)
870 (395)
Tandem Scrolls
20.0
20.0
2
2
148
148
(525)
(525)
Tandem Scrolls
20.0
25.0
2
2
148
200
(525)
(709)
Tandem Scrolls
25.0
25.0
2
2
200
200
(709)
(709)
COMPRESSORS
Type
Nominal tonnage of each Compressor
Number Of Compressors per Circuit
Oil Charge Per Compressor, oz.
Oil Charge Per Compressor, (g)
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead
Staging, 4 Stages, Circuit #2 in Lead
0-25-50-75-100
0-25-50-75-100
0-22-50-72-100
0-28-50-78-100
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.
Coil Face Area, (m2)
Finned Height x Finned Length, in.
78.8
78.8
78.8
78.8
78.8
78.8
7.3
7.3
7.3
7.3
7.3
7.3
50 x113.4 50 x113.4 50 x113.4 50 x113.4 50 x113.4 50 x113.4
1270 x
1270 x
1270 x
1270 x
1270 x
1270 x
Finned Height x Finned Length, (mm)
2880
2880
2880
2880
2880
2880
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)
450
450
450
450
450
450
Maximum Relief Valve Pressure Setting, psig (kPa)
(3103)
(3103)
(3103)
(3103)
(3103)
(3103)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, in. (mm)
Number Of Motors - HP (kW)
Fan And Motor RPM, 60Hz
60 Hz Fan Tip Speed, FPM (m/sec)
60 Hz Total Unit Airflow, CFM (m3/sec)
6 – 30 (762)
6 – 2.0
1140
8950 (4224)
65,178 (30,765)
6 – 30 (762)
6 – 2.0
1140
8950 (4224)
65,178 (30,765)
6 – 30 (762)
6 – 2.0
1140
8950 (4224)
65,178 (30,765)
1
2
14.0 x 5.2
356 x 1585
25 (95)
152 (1047)
300 (2066)
5 (127)
0.5 (12.7)
0.5 (12.7)
1
2
14.0 x 5.2
356 x 1585
25 (95)
152 (1047)
300 (2066)
5 (127)
0.5 (12.7)
0.5 (12.7)
EVAPORATOR - SHELL AND TUBE
Number of Evaporators
1
Number of Refrigerant Circuits
2
Diameter, in. - Length, ft.
14.0 x 5.2
Diameter, (mm) – Length, (mm)
356 x 1585
Water Volume, Gallons, (L)
25 (95)
Maximum Water Pressure, psig (kPa)
152 (1047)
Maximum Refrigerant Working Pressure, psig (kPa)
300 (2066)
Water Inlet / Outlet Victaulic Connections, in. (mm)
5 (127)
Drain - NPT int, in. (mm)
0.5 (12.7)
Vent - NPT int, in. (mm)
0.5 (12.7)
NOTE:
1. Nominal capacity based on 95°F ambient air and 54°F/44°F water range.
IOMM AGZ-5
AGZ 026B through 130B
31
Table 5, AGZ 100BS through 130BS
PHYSICAL DATA
AGZ MODEL NUMBER
110B
120B
100B
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW)
Number Of Refrigerant Circuits
Unit Operating Charge, R-22, lbs.
Unit Operating Charge, R-22, (kg)
Cabinet Dimensions, LxWxH, in.
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lbs. (kg)
Unit Shipping Weight, Lbs. (kg)
Add'l Weight If Copper Finned Coils, lbs. (kg)
130B
Ckt.1
Ckt.2
97.6 (342.6)
2
76
86
(35)
(39)
173.1 x 88.0 x 100.4
4397 x 2235 x 2550
7870 (3565)
7580 (3434)
1155 (524)
Ckt.1
Ckt.2
107.5 (378.4)
2
86
86
(39)
(39)
173.1 x 88.0 x 100.4
4397 x 2235 x 2550
8150 (3692)
7860 (3561)
1155 (524)
Ckt.1
Ckt.2
119.8 (421.7)
2
86
104
(39)
(47)
173.1 x 88.0 x 100.4
4397 x 2235 x 2550
8720 (3950)
8380 (3796)
1155 (524)
Ckt.1
Ckt.2
129.4 (455.5)
2
104
104
(47)
(47)
173.1 x 88.0 x 100.4
4397 x 2235 x 2550
9050 (4100)
8710 (3946)
1155 (524)
Trio Scrolls
15.0
20.0
3
3
140
148
(496)
(525)
Trio Scrolls
20.0
20.0
3
3
148
148
(525)
(525)
Trio Scrolls
20.0
25.0
3
3
148
200
(525)
(709)
Trio Scrolls
25.0
25.0
3
3
200
200
(709)
(709)
COMPRESSORS
Type
Nominal tonnage of each Compressor
Number Of Compressors per Circuit
Oil Charge Per Compressor, oz.
Oil Charge Per Compressor, (g)
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 6 Stages, Circuit #1 in Lead
Staging, 6 Stages, Circuit #2 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
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.
Coil Face Area, (m2)
Finned Height x Finned Length, in.
105.3
105.3
105.3
105.3
105.3
105.3
105.3
105.3
9.8
9.8
9.8
9.8
9.8
9.8
9.8
9.8
50 x151.6 50 x151.6 50 x151.6 50 x151.6 50 x151.6 50 x151.6 50 x151.6 50 x151.6
1270 x
1270 x
1270 x
1270 x
1270 x
1270 x
1270 x
1270 x
Finned Height x Finned Length, (mm)
3851
3851
3851
3851
3851
3851
3851
3851
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 Pressure Setting, psig
450
450
450
450
450
450
450
450
(kPa)
(3103)
(3103)
(3103)
(3103)
(3103)
(3103)
(3103)
(3103)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, in. (mm)
Number Of Motors - HP (kW)
Fan And Motor RPM, 60Hz
60 Hz Fan Tip Speed, FPM (m/sec)
60 Hz Total Unit Airflow, CFM (m3/sec)
8 – 30 (762)
8 – 2.0
1140
8950 (4224)
86,904 (41,020)
8 – 30 (762)
8 – 2.0
1140
8950 (4224)
86,904 (41,020)
8 – 30 (762)
8 – 2.0
1140
8950 (4224)
86,904 (41,020)
8 – 30 (762)
8 – 2.0
1140
8950 (4224)
86,904 (41,020)
1
2
12.8 x 7.9
324 x 2408
34 (127)
152 (1047)
1
2
12.8 x 7.9
324 x 2408
34 (127)
152 (1047)
1
2
14.0 x 8.0
356 x 2438
40 (150)
152 (1047)
1,
2
14.0 x 8.0
356 x 2438
40 (150)
152 (1047)
300 (2066)
300 (2066)
300 (2066)
300 (2066)
EVAPORATOR - SHELL AND TUBE
Number of Evaporators
Number of Refrigerant Circuits
Diameter, in. - Length, ft.
Diameter, (mm) – Length, (mm)
Water Volume, Gallons, (L)
Maximum Water Pressure, psig (kPa)
Maximum Refrigerant Working Pressure, psig
(kPa)
Water Inlet / Outlet Victaulic Connections, in.
(mm)
Drain - NPT int, in. (mm)
Vent - NPT int, in. (mm)
5 (127)
5 (127)
5 (127)
5 (127)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
0.5 (12.7)
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
Volts
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
Power Supply
Field Wire
Minimum
Circuit
Ampacity
(MCA)
Quantity
133
126
80
68
52
146
143
88
74
58
158
150
96
79
64
167
167
113
81
70
184
184
121
94
78
199
199
127
104
86
221
214
145
108
96
248
228
156
112
105
281
281
162
124
109
301
301
168
130
112
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
Wire
Gauge
75C
Recomm’d.
Fuse
Or HACR
Breaker
Size
Max. Fuse
Or HACR
Breaker
Size
1/0
#1
#4
#4
#6
1/0
1/0
#3
#4
#6
2/0
1/0
#3
#4
#6
2/0
2/0
#2
#4
#4
3/0
3/0
#1
#3
#4
3/0
3/0
#1
#2
#3
4/0
4/0
1/0
#2
#3
250
4/0
2/0
#2
#2
300
300
2/0
#1
#2
350
350
2/0
#1
#2
150
150
90
80
60
175
175
100
80
70
175
175
110
90
70
200
200
125
90
80
225
225
125
110
90
225
225
150
125
100
250
250
175
125
110
300
250
175
150
125
350
350
200
150
125
350
350
200
150
125
150
150
90
80
60
175
175
100
90
70
175
175
110
90
70
200
200
125
90
80
225
225
125
110
90
225
225
150
125
100
250
250
175
125
110
300
250
175
150
125
350
350
200
150
125
350
350
200
150
125
NOTES:
1. Units operating in ambient temperatures of 95°F (35°C) and above must use the
Maximum Fuse or HACR Breaker size.
2. All Electrical Data notes are on page 49.
3. Conduit hubs are not provided.
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)
Rated Load Amps
AGZ
Unit
Size
026B
030B
035B
040B
045B
050B
055B
060B
065B
070B
34
F.L.Amps
Compressors
Volts
Fan
Motors
No. 1 No. 3 No. 5 No. 2 No. 4 No. 6
(Each)
208
25.7
25.7
25.7 25.7
5.8
230
24.2
24.2
24.2 24.2
5.8
380
14.9
14.9
14.9 14.9
4.1
460
13.4
13.4
13.4 13.4
2.8
575
9.3
9.3
9.3
9.3
3.0
208
25.7
25.7
31.8 31.8
5.8
230
24.2
24.2
31.8 31.8
5.8
380
14.9
14.9
18.6 18.6
4.1
460
13.4
13.4
16.0 16.0
2.8
575
9.3
9.3
12.2 12.2
3.0
208
31.8
31.8
31.8 31.8
5.8
230
29.9
29.9
29.9 29.9
5.8
380
18.6
18.6
18.6 18.6
4.1
460
16.0
16.0
16.0 16.0
2.8
575
12.2
12.2
12.2 12.2
3.0
208
33.8
33.8
33.8 33.8
5.8
230
33.8
33.8
33.8 33.8
5.8
380
22.8
22.8
22.8 22.8
4.1
460
16.5
16.5
16.5 16.5
2.8
575
13.7
13.7
13.7 13.7
3.0
208
33.8
33.8
41.4 41.4
5.8
230
33.8
33.8
41.4 41.4
5.8
380
22.8
22.8
26.0 26.0
4.1
460
16.5
16.5
21.8 21.8
2.8
575
13.7
13.7
17.3 17.3
3.0
208
41.4
41.4
41.4 41.4
5.8
230
41.4
41.4
41.4 41.4
5.8
380
26.0
26.0
26.0 26.0
4.1
460
21.8
21.8
21.8 21.8
2.8
575
17.3
17.3
17.3 17.3
3.0
208
41.0
41.0
51.3 51.3
5.8
230
41.0
41.0
48.1 48.1
5.8
380
26.0
26.0
33.8 33.8
4.1
460
21.8
21.8
23.7 23.7
2.8
575
17.3
17.3
21.8 21.8
3.0
208
52.8
52.8
52.8 52.8
5.8
230
48.1
48.1
48.1 48.1
5.8
380
32.7
32.7
32.7 32.7
4.1
460
23.7
23.7
23.7 23.7
2.8
575
21.8
21.8
21.8 21.8
3.0
208
52.8
52.8
52.8 73.1
7.8
230
52.8
52.8
52.8 73.1
7.8
380
32.7
32.7
32.7 38.2
4.1
460
23.7
23.7
23.7 30.1
3.6
575
21.8
21.8
21.8 25.2
3.0
208
52.8
73.1
52.8 73.1
7.8
230
52.8
73.1
52.8 73.1
7.8
380
32.7
38.2
32.7 38.2
4.1
460
23.7
30.1
23.7 30.1
3.6
575
21.8
25.2
21.8 25.2
3.0
All Electrical Data notes are on page 49.
Locked Rotor Amps
No. Of
Fan
Motors
AGZ 026B through 130B
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
Compressors
Fan
Motors
(Each)
No.1
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
31.7
35.6
20.0
17.8
14.0
31.7
35.6
20.0
17.8
14.0
189
189
112
99
74
189
189
112
99
74
232
232
144
125
100
278
278
151
127
100
278
278
151
127
100
350
350
195
158
125
350
350
195
158
125
425
425
239
187
148
425
425
239
187
148
425
425
239
187
148
Across-The-Line
No. 3 No. 5
189
189
112
99
74
189
189
112
99
74
232
232
144
125
100
278
278
151
127
100
278
278
151
127
100
350
350
195
158
125
350
350
195
158
125
425
425
239
187
148
425
425
239
187
148
505
505
280
225
180
-
No.2
No.4
No. 6
189
189
112
99
74
232
232
144
125
100
232
232
144
125
100
278
278
151
127
100
350
350
195
158
125
350
350
195
158
125
425
425
239
187
148
425
425
239
187
148
425
425
239
187
148
425
425
239
187
148
189
189
112
99
74
232
232
144
125
100
232
232
144
125
100
278
278
151
127
100
350
350
195
158
125
350
350
195
158
125
425
425
239
187
148
425
425
239
187
148
505
505
280
225
180
505
505
280
225
180
-
IOMM AGZ-5
Table 21, AGZ 026 BM/BS – 070BM/BS, Field Wiring, Single Point
Wiring to Standard
Power Block
Volts
Connector Wire
Terminal
Range
Amps
(Copper Wire Only)
208
175
14 GA – 2/0
230
175
14 GA – 2/0
026B
380
175
14 GA – 2/0
460
175
14 GA – 2/0
575
175
14 GA – 2/0
208
380
#4 – 500kcmil
230
380
#4 – 500kcmil
030B
380
175
14 GA – 2/0
460
175
14 GA – 2/0
575
175
14 GA – 2/0
208
380
#4 – 500kcmil
230
380
#4 – 500kcmil
035B
380
175
14 GA – 2/0
460
175
14 GA – 2/0
575
175
14 GA – 2/0
208
380
#4 – 500kcmil
230
380
#4 – 500kcmil
040B
380
175
14 GA – 2/0
460
175
14 GA – 2/0
575
175
14 GA – 2/0
208
380
#4 – 500kcmil
230
380
#4 – 500kcmil
045B
380
175
14 GA – 2/0
460
175
14 GA – 2/0
575
175
14 GA – 2/0
208
380
#4 – 500kcmil
230
380
#4 – 500kcmil
050B
380
175
14 GA – 2/0
460
175
14 GA – 2/0
575
175
14 GA – 2/0
208
380
#4 – 500kcmil
230
380
#4 – 500kcmil
055B
380
175
14 GA – 2/0
460
175
14 GA – 2/0
575
175
14 GA – 2/0
208
380
#4 – 500kcmil
230
380
#4 – 500kcmil
060B
380
380
#4 – 500kcmil
460
175
14 GA – 2/0
575
175
14 GA – 2/0
208
380
#4 – 500kcmil
230
380
#4 – 500kcmil
065B
380
380
#4 – 500kcmil
460
175
14 GA – 2/0
575
175
14 GA – 2/0
208
380
#4 – 500kcmil
230
380
#4 – 500kcmil
070B
380
380
#4 – 500kcmil
460
380
#4 – 500kcmil
575
175
14 GA – 2/0
All Electrical Data notes are on page 49.
AGZ
Unit
Size
IOMM AGZ-5
AGZ 026B through 130B
Wiring to Optional
Non-Fused Disconnect Switch
Connector Wire
Disconnect
Range
Size
(Copper Wire Only)
225
# 4 - 300 kcmil
225
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
225
# 4 - 300 kcmil
225
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
225
# 4 - 300 kcmil
225
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
225
# 4 - 300 kcmil
225
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
225
# 4 - 300 kcmil
225
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
250
#6 - 350 kcmil
250
#6 - 350 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
400
250 kcmil -500 kcmil
400
250 kcmil -500 kcmil
250
#6 - 350 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
400
250 kcmil -500 kcmil
400
250 kcmil -500 kcmil
250
#6 - 350 kcmil
150
# 4 - 300 kcmil
150
# 4 - 300 kcmil
400
250 kcmil -500 kcmil
400
250 kcmil -500 kcmil
250
#6 - 350 kcmil
250
# 4 - 300 kcmil
150
# 4 - 300 kcmil
400
250 kcmil -500 kcmil
400
250 kcmil -500 kcmil
250
#6 - 350 kcmil
250
# 4 - 300 kcmil
150
# 4 - 300 kcmil
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
Volts
Minimum
Circuit
Ampacity
(MCA)
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
358
358
187
150
125
380
380
219
171
136
414
414
248
188
146
463
463
260
199
171
528
528
282
220
182
613
613
323
248
198
613
613
361
273
212
Power Supply
Field Wire
Wire
Quantity
Gauge
75C
6
4/0
6
4/0
3
3/0
3
1/0
3
#1
6
250
6
250
3
250
3
2/0
3
1/0
6
300
6
300
3
250
3
3/0
3
1/0
6
350
6
300
3
300
3
3/0
3
2/0
6 - (2)
300
6 - (2)
300
3
300
3
4/0
3
3/0
6 - (2)
350
6 - (2)
350
3
400
3
250
3
3/0
6 - (2)
350
6 - (2)
350
6
4/0
3
300
3
4/0
Recomm’d.
Fuse
Or HACR
Breaker
Size
Max. Fuse
400
400
225
175
150
450
450
250
200
150
500
500
300
225
175
500
500
300
225
175
600
600
300
250
200
700
700
350
250
225
700
700
400
300
225
400
400
225
175
150
450
450
250
200
150
500
500
300
225
175
500
500
300
225
175
600
600
300
250
200
700
700
350
250
225
700
700
400
300
225
Or HACR
Breaker
Size
NOTES:
1. Units operating in ambient temperatures of 95°F (35°C) and above must use the Maximum
Fuse or HACR Breaker size.
2. All Electrical Data notes are on page 49.
3. (2) indicates that two conduits are required.
4. Conduit hubs are not supplied.
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)
AGZ
Unit
Size
075B
085B
090B
100B
110B
120B
130B
Rated Load Amps
Compressors
Volts
No. 1
No. 3 No. 5 No. 2
208
73.1
73.1
73.1
230
73.1
73.1
73.1
380
38.2
38.2
38.2
460
30.1
30.1
30.1
575
25.2
25.2
25.2
208
73.1
73.1
83.3
230
73.1
73.1
83.3
380
38.2
38.2
52.5
460
30.1
30.1
39.0
575
25.2
25.2
30.0
208
86.4
86.4
86.4
230
86.4
86.4
86.4
380
52.5
52.5
52.5
460
39.0
39.0
39.0
575
30.0
30.0
30.0
208
52.8
52.8 52.8 74.5
230
52.8
52.8 52.8 74.5
380
32.7
32.7 32.7 39.8
460
23.7
23.7 23.7 30.6
575
21.8
21.8 21.8 25.2
208
74.5
74.5 74.5 74.5
230
74.5
74.5 74.5 74.5
380
39.8
39.8 39.8 39.8
460
30.6
30.6 30.6 30.6
575
25.2
25.2 25.2 25.2
208
87.9
87.9 87.9 88.0
230
87.9
87.9 87.9 88.0
380
39.8
39.8 39.8 52.5
460
30.6
30.6 30.6 39.0
575
25.2
25.2 25.2 30.0
208
88.0
88.0 88.0 88.0
230
88.0
88.0 88.0 88.0
380
52.5
52.5 52.5 52.5
460
39.0
39.0 39.0 39.0
575
30.0
30.0 30.0 30.0
All Electrical Data notes are on page
IOMM AGZ-5
No. 4
73.1
73.1
38.2
30.1
25.2
83.3
83.3
52.5
39.0
30.0
86.4
86.4
52.5
39.0
30.0
74.5
74.5
39.8
30.6
25.2
74.5
74.5
39.8
30.6
25.2
88.0
88.0
52.5
39.0
30.0
88.0
88.0
52.5
39.0
30.0
49.
F.L.
No. Of
Fan
Amps
Fan
Fan Motors Motors
No. 6
(Each) No.1
Motors
(Each)
7.8
6
31.7
505
7.8
6
35.6
505
4.1
6
20.0
280
3.6
6
17.8
225
3.0
6
14.0
180
7.8
6
31.7
505
7.8
6
35.6
505
4.1
6
20.0
280
3.6
6
17.8
225
3.0
6
14.0
180
7.8
6
31.7
500
7.8
6
35.6
500
4.1
6
20.0
305
3.6
6
17.8
250
3.0
6
14.0
198
74.5
7.8
8
31.7
425
74.5
7.8
8
35.6
425
39.8
4.1
8
20.0
239
30.6
3.6
8
17.8
187
25.2
3.0
8
14.0
148
74.5
7.8
8
31.7
505
74.5
7.8
8
35.6
505
39.8
4.1
8
20.0
280
30.6
3.6
8
17.8
225
25.2
3.0
8
14.0
180
88.0
7.8
8
31.7
505
88.0
7.8
8
35.6
505
52.5
4.1
8
20.0
280
39.0
3.6
8
17.8
225
30.0
3.0
8
14.0
180
88.0
7.8
8
31.7
500
88.0
7.8
8
35.6
500
52.5
4.1
8
20.0
305
39.0
3.6
8
17.8
250
30.0
3.0
8
14.0
198
AGZ 026B through 130B
Locked Rotor Amps
Compressors
Across-The-Line
No. 3 No. 5
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
425
425
239
187
148
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
425
425
239
187
148
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
No.2
No.4
No. 6
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
37
Table 24, AGZ 075BM/BS - 130BM/BS, Field Wiring, Single Point
Wiring to Standard
Power Block
Volts
Connector Wire
Terminal
Range
Amps
(Copper Wire Only)
208
760
2 GA – 500kcmil
230
760
2 GA – 500kcmil
075B
380
380
#4 – 500kcmil
460
380
#4 – 500kcmil
575
380
#4 – 500kcmil
208
760
2 GA – 500kcmil
230
760
2 GA – 500kcmil
085B
380
380
#4 – 500kcmil
460
380
#4 – 500kcmil
575
380
#4 – 500kcmil
208
760
2 GA – 500kcmil
230
760
2 GA – 500kcmil
090B
380
380
#4 – 500kcmil
460
380
#4 – 500kcmil
575
380
#4 – 500kcmil
208
760
2 GA – 500kcmil
230
760
2 GA – 500kcmil
100B
380
380
#4 – 500kcmil
460
380
#4 – 500kcmil
575
380
#4 – 500kcmil
208
760
2 GA – 500kcmil
230
760
2 GA – 500kcmil
110B
380
380
#4 – 500kcmil
460
380
#4 – 500kcmil
575
380
#4 – 500kcmil
208
760
2 GA – 500kcmil
230
760
2 GA – 500kcmil
120B
380
380
#4 – 500kcmil
460
380
#4 – 500kcmil
575
380
#4 – 500kcmil
208
760
2 GA – 500kcmil
230
760
2 GA – 500kcmil
130B
380
760
2 GA – 500kcmil
460
380
#4 – 500kcmil
575
380
#4 – 500kcmil
All Electrical Data notes are on page 49.
AGZ
Unit
Size
38
AGZ 026B through 130B
Wiring to Optional
Non-Fused Disconnect Switch
Disconnect Connector Wire Range
Size
(Copper Wire Only)
600
600
250
250
250
600
600
400
250
250
600
600
400
250
250
600
600
400
400
250
800
800
400
400
400
800
800
400
400
400
800
800
600
400
400
(2) 250 kcmil -500 kcmil
(2) 250 kcmil -500 kcmil
#6 - 350 kcmil
#6 - 350 kcmil
#6 - 350 kcmil
(2) 250 kcmil -500 kcmil
(2) 250 kcmil -500 kcmil
250 kcmil -500 kcmil
#6 - 350 kcmil
#6 - 350 kcmil
(2) 250 kcmil -500 kcmil
(2) 250 kcmil -500 kcmil
250 kcmil -500 kcmil
#6 - 350 kcmil
#6 - 350 kcmil
(2) 250 kcmil -500 kcmil
(2) 250 kcmil -500 kcmil
250 kcmil -500 kcmil
250 kcmil -500 kcmil
#6 - 350 kcmil
(2) 250 kcmil -500 kcmil
(2) 250 kcmil -500 kcmil
250 kcmil -500 kcmil
(2) 3/0-250 kcmil
(2) 3/0-250 kcmil
(2) 250 kcmil -500 kcmil
(2) 250 kcmil -500 kcmil
250 kcmil -500 kcmil
250 kcmil -500 kcmil
(2) 3/0-250 kcmil
(2) 250 kcmil -500 kcmil
(2) 250 kcmil -500 kcmil
(2) 3/0-250 kcmil
250 kcmil -500 kcmil
(2) 3/0-250 kcmil
IOMM AGZ-5
Table 25, AGZ 026BM/BS – 070BM/BS, Electrical Data, Multi-Point (Up to 105°F)
AGZ
Unit
Size
Volts
Electrical Circuit #1
Electrical Circuit #2
Max.
Recomm’d
Power
Supply
Power
Supply Recomm’d
Max. Fuse Minimum
Minimum
Fuse
Fuse
Fuse
Field
Wire
Field
Wire
Circuit
or HACR
Circuit
or HACR or HACR
or HACR
Breaker Ampacity
Ampacity
Wire
Wire
Breaker
Breaker
Breaker
Qty
Qty
(MCA)
Size
(MCA)
Gauge
Gauge
Size
Size
Size
70
3
#4
80
90
70
3
#4
80
90
66
3
#4
80
90
66
3
#4
80
90
42
3
#8
50
50
42
3
#8
50
50
36
3
#8
45
45
36
3
#8
45
45
27
3
#10
35
35
27
3
#10
35
35
70
3
#4
80
90
83
3
#4
100
110
66
3
#4
80
90
83
3
#4
100
100
42
3
#8
50
50
50
3
#8
60
60
36
3
#8
45
45
42
3
#8
50
50
27
3
#10
35
35
34
3
#10
40
45
83
3
#4
100
110
83
3
#4
100
110
79
3
#4
100
100
79
3
#4
100
100
50
3
#8
60
60
50
3
#8
60
60
42
3
#8
50
50
42
3
#8
50
50
34
3
#10
40
45
34
3
#10
40
45
88
3
#3
110
110
88
3
#3
110
110
88
3
#3
110
100
88
3
#3
110
100
60
3
#6
70
80
60
3
#6
70
80
43
3
#8
50
50
43
3
#8
50
50
37
3
#8
45
50
37
3
#8
45
50
88
3
#3
110
110
105
3
#2
125
125
88
3
#3
110
110
105
3
#2
125
125
60
3
#6
70
80
67
3
#4
80
80
43
3
#8
50
50
55
3
#6
70
70
37
3
#8
45
50
45
3
#8
50
60
105
3
#2
125
125
105
3
#2
125
125
105
3
#2
125
125
105
3
#2
125
125
67
3
#4
80
80
67
3
#4
80
80
55
3
#6
70
70
55
3
#6
70
70
45
3
#8
50
60
45
3
#8
50
60
105
3
#2
125
125
120
3
#1
150
150
105
3
#2
125
125
120
3
#1
150
150
67
3
#4
80
80
82
3
#3
100
110
55
3
#6
70
70
59
3
#6
70
80
45
3
#8
50
60
55
3
#6
70
70
120
3
#1
150
150
120
3
#1
150
150
120
3
#1
150
150
120
3
#1
150
150
82
3
#3
100
110
82
3
#3
100
110
59
3
#6
70
80
59
3
#6
70
80
55
3
#6
70
70
55
3
#6
70
70
135
3
1/0
175
175
160
3
2/0
200
225
135
3
1/0
175
175
160
3
2/0
200
225
82
3
#4
100
110
89
3
#3
110
125
61
3
#6
70
80
69
3
#4
90
100
55
3
#6
70
70
59
3
#6
70
80
160
3
2/0
200
225
160
3
2/0
200
225
160
3
2/0
200
225
160
3
2/0
200
225
89
3
#3
110
125
89
3
#3
110
125
69
3
#4
90
100
69
3
#4
90
100
59
3
#6
70
80
59
3
#6
70
80
208
230
026B 380
460
575
208
230
030B 380
460
575
208
230
035B 380
460
575
208
230
040B 380
460
575
208
230
045B 380
460
575
208
230
050B 380
460
575
208
230
055B 380
460
575
208
230
060B 380
460
575
208
230
065B 380
460
575
208
230
070B 380
460
575
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-Point
AGZ
Unit
Size
Wiring to Standard
Power Block
Volts
Terminal
Amps
Connector Wire Range
(Copper Wire Only)
Cir #1
Cir #2
Cir #1
208
175
175
14 GA – 2/0
175
14 GA – 2/0
230
175
175
14 GA – 2/0
026B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
208
175
175
14 GA – 2/0
175
14 GA – 2/0
230
175
175
14 GA – 2/0
030B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
208
175
175
14 GA – 2/0
175
14 GA – 2/0
230
175
175
14 GA – 2/0
035B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
208
175
175
14 GA – 2/0
175
14 GA – 2/0
230
175
175
14 GA – 2/0
040B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
208
175
175
14 GA – 2/0
175
14 GA – 2/0
230
175
175
14 GA – 2/0
045B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
208
175
175
14 GA – 2/0
175
14 GA – 2/0
230
175
175
14 GA – 2/0
050B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
208
175
175
14 GA – 2/0
175
14 GA – 2/0
230
175
175
14 GA – 2/0
055B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
208
175
175
14 GA – 2/0
175
14 GA – 2/0
230
175
175
14 GA – 2/0
060B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
208
380
380
#4 – 500 kcmil
380
#4 – 500 kcmil
230
380
175
14 GA – 2/0
065B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
208
380
380
#4 – 500 kcmil
380
#4 – 500 kcmil
230
380
175
14 GA – 2/0
070B
380
175
175
14 GA – 2/0
460
175
175
14 GA – 2/0
575
175
All Electrical Data notes are on page 49.
40
Wiring to Optional
Non-Fused Disconnect Switch
Cir #2
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
AGZ 026B through 130B
Disconnect Size
Cir #1
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
150
150
150
150
150
150
150
150
225
225
150
150
150
225
225
150
150
150
Cir #2
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
150
150
150
150
150
150
150
150
225
225
150
150
150
225
225
150
150
150
Connector Wire Range
(Copper Wire Only)
Cir #1
#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
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
#14 - 1/0
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
#14 - 1/0
Cir #2
#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
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
#14 - 1/0
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
#14 - 1/0
IOMM AGZ-5
Table 27, AGZ 075BM/BS - 130BM/BS, Field Wiring Data
Wiring to Standard
Power Block
AGZ
Unit
Size
Volts
075B
208
230
380
460
575
Cir #1
380
380
175
175
175
Cir #2
380
380
175
175
175
Cir #1
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
Cir #2
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
Cir #1
250
250
250
150
150
Cir #2
250
250
250
150
150
Cir #1
#4 – 300 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
Cir #2
#4 – 300 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
085B
208
230
380
460
575
380
380
175
175
175
380
380
175
175
175
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
250
250
250
150
150
250
250
250
150
150
#4 – 300 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
#4 – 300 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
090B
208
230
380
460
575
380
380
175
175
175
380
380
175
175
175
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
250
250
250
150
150
250
250
250
150
150
#4 – 300 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
#4 – 300 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
100B
208
230
380
460
575
380
380
175
175
175
380
380
175
175
175
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
14 GA – 2/0
14 GA – 2/0
250
250
150
150
150
400
400
250
250
150
#4 – 300 kcmil 250 – 500 kcmil
#4 – 300 kcmil 250 – 500 kcmil
#14 - 1/0
#4 – 300 kcmil
#14 - 1/0
#4 – 300 kcmil
#14 - 1/0
#14 - 1/0
110B
208
230
380
460
575
380
380
380
380
175
380
380
380
380
175
#4 – 500 kcmil
#4 – 500 kcmil
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
#4 – 500 kcmil
#4 – 500 kcmil
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
400
400
250
250
150
400
400
250
250
150
250 – 500 kcmil
250 – 500 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
250 – 500 kcmil
250 – 500 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
120B
208
230
380
460
575
380
380
380
380
175
380
380
380
380
175
#4 – 500 kcmil #4 – 500 kcmil
#4 – 500 kcmil #4 – 500 kcmil
#4 – 500 kcmil #4 – 500 kcmil
#4 – 500
#4 – 500 kcmil14
14 GA – 2/0
14 GA – 2/0
400
400
250
250
150
400
400
250
250
150
250 – 500 kcmil
250 – 500 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
250 – 500 kcmil
250 – 500 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
400
400
250
250
150
400
400
250
250
150
250 – 500 kcmil
250 – 500 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
250 – 500 kcmil
250 – 500 kcmil
#4 – 300 kcmil
#4 – 300 kcmil
#14 - 1/0
Terminal
Amps
Connector Wire Range
(Copper Wire Only)
208
380
380
#4 – 500 kcmil
230
380
380
#4 – 500 kcmil
380
380
380
#4 – 500 kcmil
130B
460
380
380
#4 – 500 kcmil
575
175
175
14 GA – 2/0
All Electrical Data notes are on page 49.
IOMM AGZ-5
Wiring to Optional
Non-Fused Disconnect Switch
#4 – 500 kcmil
#4 – 500 kcmil
#4 – 500 kcmil
#4 – 500 kcmil
14 GA – 2/0
AGZ 026B through 130B
Disconnect Size
Connector Wire Range
(Copper Wire Only)
41
Table 28, AGZ 065BM/BS - 130BM/BS, Electrical Data, Multi-Point (Up to 105°F)
AGZ
Unit
Size
075B
Electrical Circuit #1
Electrical Circuit #2
Power
Power
Max.
Recomm’d
Recomm’d
Supply
Supply
Max. Fuse Minimum
Minimum
Fuse
Fuse
Fuse
Volts Circuit
Circuit
or HACR
Field Wire
Field Wire
or HACR or HACR
or HACR
Breaker Ampacity
Ampacity
Wire
Wire
Breaker
Breaker
Breaker
(MCA)
Size
(MCA)
Qty Gauge
Qty Gauge
Size
Size
Size
75C
75C
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
085B
208
230
380
460
575
188
188
98
79
66
3
3
3
3
3
3/0
3/0
#3
#4
#4
225
225
110
90
80
250
250
125
110
90
218
218
130
99
77
3
3
3
3
3
4/0
4/0
#1
#3
#4
250
250
150
125
90
300
250
175
125
100
090B
208
230
380
460
575
218
218
130
99
77
3
3
3
3
3
4/0
4/0
#1
#3
#4
250
250
150
125
90
300
250
175
125
100
218
218
130
99
77
3
3
3
3
3
4/0
4/0
#1
#3
#4
250
250
150
125
90
300
250
175
125
100
100B
208
230
380
460
575
203
203
123
92
83
3
3
3
3
3
4/0
3/0
#1
#3
#4
250
225
150
110
100
250
225
150
110
100
273
273
146
114
94
3
3
3
3
3
300
300
1/0
#1
#3
300
300
175
150
110
300
300
200
175
125
110B
208
230
380
460
575
273
273
146
114
94
3
3
3
3
3
300
300
1/0
#1
#3
300
300
175
125
110
300
300
175
125
110
273
273
146
114
94
3
3
3
3
3
300
300
1/0
#1
#3
300
300
175
125
110
300
300
175
125
110
120B
208
230
380
460
575
317
317
146
114
94
3
3
3
3
3
300
300
1/0
#1
#3
400
400
175
125
110
400
400
175
125
110
317
318
187
141
110
3
3
3
3
3
400
400
2/0
1/0
#2
400
400
225
175
125
400
400
225
175
125
130B
208
230
380
460
575
317
318
187
141
110
3
3
3
3
3
400
400
2/0
1/0
#2
400
400
225
175
125
400
400
225
175
125
317
318
187
141
110
3
3
3
3
3
400
400
2/0
1/0
#2
400
400
225
175
125
400
400
225
175
125
NOTES:
1. All Electrical Data notes are on page 49.
2. Conduit hubs are not supplied.
42
AGZ 026B through 130B
IOMM AGZ-5
Electrical Data - High Ambient
Table 29, AGZ 026BB/BH – 070BB/BH, Electrical Data, Single Point
AGZ Unit
Size
026B
030B
035B
040B
045B
050B
055B
060B
065B
070B
Volts
Minimum
Circuit
Ampacity
(MCA)
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
147
133
80
68
53
158
144
88
74
59
168
155
96
80
64
187
167
113
84
70
207
188
123
94
78
226
207
132
104
86
249
229
147
115
96
270
248
160
124
105
303
282
164
138
115
323
304
172
150
123
Power Supply
Field Wire
Wire
Quantity
Gauge
75C
3
1/0
3
1/0
3
#4
3
#4
3
#6
3
2/0
3
1/0
3
#3
3
#4
3
#6
3
2/0
3
2/0
3
#3
3
#4
3
#6
3
3/0
3
2/0
3
#2
3
#4
3
#4
3
4/0
3
3/0
3
#1
3
#3
3
#4
3
4/0
3
3/0
3
1/0
3
#2
3
#3
3
250
3
4/0
3
1/0
3
#2
3
#3
3
300
3
250
3
2/0
3
#1
3
#2
3
350
3
300
3
2/0
3
1/0
3
#2
3
400
3
350
3
2/0
3
1/0
3
#1
Recomm’d.
Fuse
Or HACR
Breaker
Size
Max. Fuse
Or HACR
Breaker
Size
175
150
90
80
60
175
175
100
90
70
200
175
110
90
70
200
200
125
90
80
225
225
125
110
90
225
225
150
125
100
250
250
175
125
110
300
250
175
150
125
350
350
200
175
125
400
350
200
175
150
175
150
90
80
60
175
175
100
90
70
200
175
110
90
70
200
200
125
90
80
225
225
125
110
90
225
225
150
125
100
250
250
175
125
110
300
250
175
150
125
350
350
200
175
125
400
350
200
175
150
NOTES:
1. Units operating in ambient temperatures above 95°F (35°C) must use the Maximum Fuse or
HACR Breaker size.
2. All Electrical Data notes are on page 49.
3. Conduit hubs are not provided.
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)
AGZ
Unit
Size
026B
030B
035B
040B
045B
050B
055B
060B
065B
070B
44
Rated Load Amps
Compressors
Volts
No. 1
No. 3 No. 5 No. 2
208
29.0
29.0
230
25.7
25.7
380
14.9
14.9
460
13.4
13.4
575
9.5
9.5
208
29.0
29.0
230
25.7
25.7
380
14.9
14.9
460
13.4
13.4
575
9.5
9.5
208
34.0
34.0
230
30.9
30.9
380
18.6
18.6
460
16.2
16.2
575
12.2
12.2
208
38.5
38.5
230
33.8
33.8
380
22.8
22.8
460
17.0
17.0
575
13.7
13.7
208
38.5
38.5
230
33.8
33.8
380
22.8
22.8
460
17.0
17.0
575
13.7
13.7
208
47.6
47.6
230
43.3
43.3
380
27.2
27.2
460
21.8
21.8
575
17.3
17.3
208
47.6
47.6
230
43.3
43.3
380
27.2
27.2
460
21.8
21.8
575
17.3
17.3
208
58.1
58.1
230
52.8
52.8
380
33.8
33.8
460
26.5
26.5
575
21.8
21.8
208
58.1
58.1
230
52.8
52.8
380
32.7
32.7
460
25.5
25.5
575
21.8
21.8
208
58.1
78.0
230
52.8
74.1
380
32.7
39.8
460
25.5
37.5
575
21.8
29.9
All Electrical Data notes
-
No. 4
29.0
25.7
14.9
13.4
9.5
34.0
30.9
18.6
16.2
12.2
34.0
30.9
18.6
16.2
12.2
38.5
33.8
22.8
17.0
13.7
47.6
43.3
27.2
21.8
17.3
47.6
43.3
27.2
21.8
17.3
58.1
52.8
33.8
26.5
21.8
58.1
52.8
33.8
26.5
21.8
58.1
52.8
32.7
25.5
21.8
58.1
52.8
32.7
25.5
21.8
are on page
29.0
25.7
14.9
13.4
9.5
34.0
30.9
18.6
16.2
12.2
34.0
30.9
18.6
16.2
12.2
38.5
33.8
22.8
17.0
13.7
47.6
43.3
27.2
21.8
17.3
47.6
43.3
27.2
21.8
17.3
58.1
52.8
33.8
26.5
21.8
58.1
52.8
33.8
26.5
21.8
78.0
74.1
39.8
37.5
29.9
78.0
74.1
39.8
37.5
29.9
49.
No.
R.L.Amps
F.L.Amps
of
Fan
Fan
Fan
No. 6 Motors Motors Motors
(Each)
(Each)
-
5.8
5.8
4.1
2.8
3.0
5.8
5.8
4.1
2.8
3.0
5.8
5.8
4.1
2.8
3.0
5.8
5.8
4.1
2.8
3.0
5.8
5.8
4.1
2.8
3.0
5.8
5.8
4.1
2.8
3.0
5.8
5.8
4.1
2.8
3.0
5.8
5.8
4.1
2.8
3.0
7.8
7.8
4.1
3.6
3.0
7.8
7.8
4.1
3.6
3.0
AGZ 026B through 130B
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
23.3
26.1
20.0
13.0
14.0
31.7
35.6
20.0
17.8
14.0
31.7
35.6
20.0
17.8
14.0
Locked Rotor Amps
Compressors
Across-The-Line
No.1
189
189
112
99
74
189
189
112
99
74
232
232
144
125
100
278
278
151
127
100
278
278
151
127
100
350
350
195
158
125
350
350
195
158
125
425
425
239
187
148
425
425
239
187
148
425
425
239
187
148
No. 3 No. 5
189
189
112
99
74
189
189
112
99
74
232
232
144
125
100
278
278
151
127
100
278
278
151
127
100
350
350
195
158
125
350
350
195
158
125
425
425
239
187
148
425
425
239
187
148
505
505
280
225
180
-
No.2
No.4
No. 6
189
189
112
99
74
232
232
144
125
100
232
232
144
125
100
278
278
151
127
100
350
350
195
158
125
350
350
195
158
125
425
425
239
187
148
425
425
239
187
148
425
425
239
187
148
425
425
239
187
148
189
189
112
99
74
232
232
144
125
100
232
232
144
125
100
278
278
151
127
100
350
350
195
158
125
350
350
195
158
125
425
425
239
187
148
425
425
239
187
148
505
505
280
225
180
505
505
280
225
180
-
IOMM AGZ-5
Table 31, AGZ 026BB/BH - 070BB/BH, Electrical Data, Multi-Point
(106°F to 125°F)
AGZ
Unit
Size
Volts
Electrical Circuit #1
Electrical Circuit #2
Power Supply Recomm’d
Power Supply Recomm’d
Max.
Max. Fuse Minimum
Minimum
Fuse
Fuse
Fuse
Field Wire
Field Wire
Circuit
or HACR
Circuit
or HACR or HACR
Wire
Wire or HACR
Breaker Ampacity
Ampacity
Breaker
Breaker
Breaker
Qty
Qty
Gauge
Gauge
(MCA)
Size
(MCA)
Size
Size
Size
75C
75C
77
3
#4
90
100
77
3
#4
90
100
70
#4
80
90
70
3
#4
80
90
3
40
#8
50
50
42
3
#8
50
50
3
36
#8
45
45
36
3
#8
45
45
3
27
#10
35
35
27
3
#10
35
35
3
77
3
#4
90
100
88
3
#3
100
110
81
#4
100
110
70
3
#4
80
90
3
50
#8
60
60
42
3
#8
50
50
3
42
#8
50
50
36
3
#8
45
45
3
34
#10
45
45
27
3
#10
35
35
3
88
3
#3
100
110
88
3
#3
100
110
81
#4
100
110
81
3
#4
100
110
3
50
#8
60
60
50
3
#8
60
60
3
42
#8
50
50
42
3
#8
50
50
3
34
#10
45
45
34
3
#10
45
45
3
98
3
#3
125
125
98
3
#3
125
125
88
#3
110
110
88
3
#3
110
110
3
60
#6
70
80
60
3
#6
70
80
3
44
#8
50
60
44
3
#8
50
60
3
37
#8
45
50
37
3
#8
45
50
3
98
3
#3
125
125
119
3
#1
150
150
109
#2
125
150
88
3
#3
110
110
3
70
#4
80
90
60
3
#6
70
80
3
55
#6
70
70
44
3
#8
50
60
3
45
#8
60
60
37
3
#8
45
50
3
119
3
#1
150
150
119
3
#1
150
150
109
#2
125
150
109
3
#2
125
150
3
70
#4
80
90
70
3
#4
80
90
3
55
#6
70
70
55
3
#6
70
70
3
45
#8
60
60
45
3
#8
60
60
3
119
3
#1
150
150
142
3
1/0
175
200
130
#1
175
175
109
3
#2
125
150
3
84
#4
100
110
70
3
#4
80
90
3
65
#4
80
90
55
3
#6
70
70
3
55
#6
70
70
45
3
#8
60
60
3
142
3
1/0
175
200
142
3
1/0
175
200
130
#1
175
175
130
3
#1
175
175
3
84
#4
100
110
84
3
#4
100
110
3
65
#4
80
90
65
3
#4
80
90
3
55
#6
70
70
55
3
#6
70
70
3
146
3
1/0
175
200
171
3
2/0
225
225
161
2/0
200
225
134
3
1/0
175
175
3
91
#3
110
125
82
3
#4
100
110
3
80
#4
100
110
67
3
#6
80
90
3
65
#6
90
90
55
3
#6
70
70
3
208
230
026B 380
460
575
208
230
030B 380
460
575
208
230
035B 380
460
575
208
230
040B 380
460
575
208
230
045B 380
460
575
208
230
050B 380
460
575
208
230
055B 380
460
575
208
230
060B 380
460
575
208
230
070B 380
460
575
NOTES:
1. All Electrical Data notes are on page 49.
2. Conduit hubs are not supplied.
IOMM AGZ-5
AGZ 026B through 130B
45
Table 32, AGZ 075BB/BH – 130BB/BH, Electrical Data, Single Point
(Above 105°F)
AGZ Unit
Size
075B
085B
090B
100B
110B
120B
130B
Volts
Minimum
Circuit
Ampacity
(MCA)
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
208
230
380
460
575
378
362
194
187
145
398
382
234
200
151
416
401
270
211
157
522
462
273
230
187
612
526
307
263
211
612
571
352
286
219
613
613
393
307
228
Power Supply
Field Wire
Wire
Quantity
Gauge
75C
6
250
6
4/0
3
3/0
3
3/0
3
1/0
6
250
6
250
3
250
3
4/0
3
1/0
6
300
6
350
3
300
3
4/0
3
2/0
6
400
6
350
3
300
3
4/0
3
3/0
6 - (2)
350
6 - (2)
300
3
350
3
300
3
4/0
6 - (2)
350
6 - (2)
350
6 - (2)
4/0
3
350
3
4/0
6 - (2)
350
6 - (2)
350
6
250
3
350
3
250
Recomm’d.
Fuse
Or HACR
Breaker
Size
Max. Fuse
450
400
225
225
175
450
450
250
225
175
500
450
300
250
175
600
500
300
250
200
700
600
350
300
225
700
600
400
300
250
700
700
450
350
250
450
400
225
225
175
450
450
250
225
175
500
450
300
250
175
600
500
300
250
200
700
600
350
300
225
700
600
400
300
250
700
700
450
350
250
Or HACR
Breaker
Size
NOTES:
1. Units operating in ambient temperatures of 95°F (35°C) and above must use the Maximum
Fuse or HACR Breaker size.
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.
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
Size
075B
085B
090B
100B
110B
120B
130B
Rated Load Amps
Compressors
Volts
No. 1
No. 3 No. 5 No. 2
208
78.0
78.0
230
74.1
74.1
380
39.8
39.8
460
38.8
38.8
575
29.9
29.9
208
78.0
78.0
230
74.1
74.1
380
39.8
39.8
460
38.8
38.8
575
29.9
29.9
208
86.9
86.9
230
83.3
83.3
380
57.6
57.6
460
44.5
44.5
575
32.5
32.5
208
58.1
58.1 58.1
230
52.8
52.8 52.8
380
32.7
32.7 32.7
460
25.5
25.5 25.5
575
21.8
21.8 21.8
208
87.9
87.9 87.9
230
74.2
74.2 74.2
380
43.8
43.8 43.8
460
37.5
37.5 37.5
575
29.9
29.9 29.9
208
87.9
87.9 87.9
230
74.2
74.2 74.2
380
43.8
43.8 43.8
460
37.5
37.5 37.5
575
29.9
29.9 29.9
208
88.0
88.0 88.0
230
88.0
88.0 88.0
380
57.6
57.6 57.6
460
44.5
44.5 44.5
575
32.5
32.5 32.5
All Electrical Data notes are
IOMM AGZ-5
No. 4
78.0
78.0
74.1
74.1
39.8
39.8
38.8
38.8
29.9
29.9
86.9
86.9
83.3
83.3
57.6
57.6
44.5
44.5
32.5
32.5
86.9
86.9
83.3
83.3
57.6
57.6
44.5
44.5
32.5
32.5
87.9
87.9
74.2
74.2
43.8
43.8
37.5
37.5
29.9
29.9
87.9
87.9
74.2
74.2
43.8
43.8
37.5
37.5
29.9
29.9
88.0
88.0
88.0
88.0
57.6
57.6
44.5
44.5
32.5
32.5
88.0
88.0
88.0
88.0
57.6
57.6
44.5
44.5
32.5
32.5
on page 49.
Locked Rotor Amps
Compressors
Across-The-Line
No.
R.L.Amps
F.L.Amps
of
Fan
Fan
Fan
No. 6 Motors Motors Motors
(Each)
(Each)
No.1
87.9
74.2
43.8
37.5
29.9
87.9
74.2
43.8
37.5
29.9
88.0
88.0
57.6
44.5
32.5
88.0
88.0
57.6
44.5
32.5
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
425
425
239
187
148
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
7.8
7.8
4.1
3.6
3.0
7.8
7.8
4.1
3.6
3.0
7.8
7.8
4.1
3.6
3.0
7.8
7.8
4.1
3.6
3.0
7.8
7.8
4.1
3.6
3.0
7.8
7.8
4.1
3.6
3.0
7.8
7.8
4.1
3.6
3.0
AGZ 026B through 130B
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
31.7
35.6
20.0
17.8
14.0
31.7
35.6
20.0
17.8
14.0
31.7
35.6
20.0
17.8
14.0
31.7
35.6
20.0
17.8
14.0
31.7
35.6
20.0
17.8
14.0
31.7
35.6
20.0
17.8
14.0
31.7
35.6
20.0
17.8
14.0
No. 3 No. 5
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
425
425
239
187
148
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
425
425
239
187
148
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
No.2
No.4
No. 6
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
505
505
280
225
180
505
505
280
225
180
500
500
305
250
198
500
500
305
250
198
47
Table 34, AGZ 075BB/BH – 130BB/BH, Electrical Data, Multi-Point (106°F)
Electrical Circuit #1
Electrical Circuit #2
Power
Power
Max.
Recomm’d
Recomm’d
Supply
Supply
Max. Fuse Minimum
Minimum
AGZ
Fuse
Fuse
Fuse
Circuit
or HACR
Field Wire
Field Wire
Unit Volts Circuit
or HACR or HACR
or HACR
Breaker Ampacity
Ampacity
Wire
Wire
Size
Breaker
Breaker
Breaker
(MCA)
Size
(MCA)
Qty Gauge
Qty Gauge
Size
Size
Size
75C
75C
208
199
3
3/0
225
250
199
3
3/0
225
250
230
190
3
3/0
225
250
190
3
3/0
225
250
075B 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
208
199
3
3/0
225
250
219
3
4/0
250
300
230
190
3
3/0
225
250
211
3
4/0
250
250
085B 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
208
219
3
4/0
250
300
219
3
4/0
250
300
230
211
3
4/0
250
250
211
3
4/0
250
250
090B 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
208
220
3
4/0
250
250
317
3
400
350
400
230
203
3
4/0
225
250
272
3
300
300
300
100B 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
208
317
3
400
350
400
317
3
400
350
400
230
272
3
300
300
300
272
3
300
300
300
110B 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
208
317
3
400
400
400
317
3
400
400
400
230
272
3
300
300
300
317
3
400
400
400
120B 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
208
317
3
400
400
400
317
3
400
400
400
230
317
3
400
400
400
317
3
400
400
400
130B 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.
IOMM AGZ-5
Connection Type
Power Block
Single Point (Standard)
Multi-Point (Optional)
Std
Std
Disconnect
Swt.
Opt.
Opt.
AGZ 026B through 130B
Circuit
Breakers
Std
Not Avail.
High Short
Circuit Current
Opt
Opt.
49
Figure 22, AGZ 026B – AGZ 130B, Typical Field Wiring
DISCONNECT
(BY OTHERS)
UNIT MAIN
TERMINAL BLOCK
GND LUG
3 PHASE
TO COMPRESSOR(S)
AND FAN MOTORS
POWER
NOTE: ALL FIELD WIRING TO BE
INSTALLED AS NEC CLASS 1
WIRING SYSTEM WITH CONDUCTOR
RATED 600 VOLTS
FIELD SUPPLIED
OPTION
FUSED CONTROL
CIRCUIT TRANSFORMER
120 VAC
DISCONNECT
(BY OTHERS)
TB1-20
N
10A
FUSE
120VAC
CONTROL POWER
(BY OTHERS)
TB1
1
CONTROL
CIRCUIT
FUSE
2
35
120 VAC
N
33
CHW PUMP RELAY
(BY OTHERS)
120 VAC 1.0 AMP MAX
ALARM BELL
OPTION
FACTORY SUPPLIED ALARM
FIELD WIRED
CONTROLLER
120 VAC
34
ALARM BELL RELAY
32
TIME
CLOCK
REMOTE STOP SWITCH
(BY OTHERS)
TB2
ON
52
IF REMOTE STOP
CONTROL IS USED,
REMOVE LEAD 585
FROM TERM. 52
TO 72.
585
72
MANUAL
OFF
AUTO
ICE MODE SWITCH
(BY OTHERS)
GND
OFF
AUTO
ALARM BELL
RELAY
43
COM
NO
BELL
1
83
ON
2
ALARM BELL OPTION
54
74
MANUAL
CHW FLOW SWITCH
---MANDATORY–(BY OTHERS)
44
NOR. OPEN PUMP AUX.
CONTACTS (OPTIONAL)
61
4-20MA FOR
EVAP. WATER RESET
(BY OTHERS)
+
4-20MA FOR
DEMAND LIMIT
(BY OTHERS)
+
68
-
69
70
-
71
GND
LESS EVAPORATOR ONLY
24 VAC
91
93
N
LIQUID LINE #1 SOLENOID
24 VAC 1.5 AMP MAX
24 VAC
92
93
DWG. 330423101 REV.0A
50
N
LIQUID LINE #2 SOLENOID
24 VAC 1.5 AMP MAX
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
67.76 (1721.10)
13.31
(338.07)
COMPRESSOR (338.07)
CIRCUIT #1
COMPRESSOR
CIRCUIT #2
2.00
(50.8)
EVAPORATOR
2.00
(50.8)
55.65 (1413.51)
CONTROL PANEL
CONTROL
PANEL
POWER ENTRY
POINT
0.875 KNOCK OUT
FIELD CONTROL
CONNECTION
100.40
(2550.16)
8.80
(223.52)
43.75
(1111.25)
Y
33.52
(851.41)
19.94
(506.48)
EVAP
OUTLET
EVAP
INLET
Z
6.38
(162.05)
19.94
(506.48)
94.38 (2397.25)
AGZ 026BS
AGZ 030BS
AGZ 035BS
AGZ 040BS
AGZ 045BS
AGZ 050BS
AGZ 055BS
AGZ 060BS
AGZ 065BS
AGZ 070BS
IOMM AGZ-5
14.33
(363.98)
DWG # 3305195
88.00 (2235.20)
Center of Gravity - Inches (mm)
Unit Size
X
X
Y
Z
39 (991)
39 (991)
40 (1016)
39 (991)
40 (1016)
40 (1016)
40 (1016)
40 (1016)
41 (1041)
41 (1041)
40 (1016)
40 (1016)
40 (1016)
39 (991)
38 (965)
39 (991)
39 (991)
39 (991)
40 (1016)
41 (1041)
42 (1067)
42 (1067)
42 (1067)
41 (1041)
41 (1041)
42 (1067)
43 (1092)
43 (1092)
45 (1143)
45 (1143)
Evap Inlet &
Outlet
Victaulic in.
3
3
3
3
3
3
3
3
3
3
AGZ 026B through 130B
Weights – Lbs (kg)
Shipping Weight
Operating Weight
3950 (1792)
3990 (1810)
4030 (1828)
4070 (1846)
4210 (1910)
4330 (1964)
4460 (2023)
4520 (2050)
4760 (2159)
4890 (2218)
3990 (1810)
4040 (1833)
4080 (1851)
4130 (1873)
4270 (1937)
4400 (1996)
4540 (2059)
4600 (2087)
4860 (2204)
4990 (2263)
51
Figure 24, AGZ 075BS - 090BS Packaged Chiller
ISOLATOR LOCATIONS ON BOTTOM OF RAIL
110.1 (2797)
COMPRESSORS CIRC. #2
12.4
(315)
12.
(315)
2.0
(51)
EVAPORATOR
INLET
OUTLET
2.0
(51)
14.3
(364)
COMPRESSORS CIRC. #1
60.0 (1525)
CONTROL
PANEL
POWER ENTRY
POINT
0.875 KNOCK OUT
CONTROL
PANEL
FIELD CONTROL
CONNECTION
100.4
(2550)
Y
43.8
(1111)
15.5
(392)
28.5 (724)
Z
6.4
(162)
28.5
(724)
88.0 (2235)
134.9 (3426)
Center of Gravity Inches (mm)
Unit Size
AGZ 075BS
AGZ 085BS
AGZ 090BS
52
14.4
(364)
X
X
Y
Z
44 (1118)
43 (1092)
44 (1118)
42 (1067)
40 (1016)
39 (991)
60 (1524)
60 (1524)
59 (1499)
Evap Inlet &
Outlet Victaulic
in.
5
5
5
AGZ 026B through 130B
Dwg. # 3305023
Weights Lbs. (kg)
Shipping Weight
Operating Weight
6320 (2867)
6480 (2939)
6640 (3012)
6530 (2962)
6690 (3035)
6850 (3107)
IOMM AGZ-5
Figure 25, AGZ 100BS - 130BS Packaged Chiller
25.2
(641)
ISOLATOR LOCATIONS ON BOTTOM OF RAIL
67.8 (1721)
67.8 (1721)
COMPRESSORS CIRC. #2
12.4 (315)
2.0
(51)
EVAPORATOR
OUTLET
"A"
33.7
(855)
INLET
"A"
2.0
(51)
"B"
COMPRESSORS CIRC. #1
"C"
CONTROL
PANEL
POWER ENTRY POINT
CONTROL
PANEL
0.875 KNOCK OUTS
FIELD CONTROL
CONNECTION
100.4
(2550)
43.8
(1111)
Y
16.2
(410)
24.0
(610)
24.0
(610)
Z
6.4 (162)
X
173.1 (4396)
Unit Size
AGZ 100BS
AGZ 110BS
AGZ 120BS
AGZ 130BS
IOMM AGZ-5
Evap Inlet
& Outlet
Victaulic
“A” in.
5
5
8
8
14.4 (365)
88.0 (2235)
Dwg. # 3305024
Evaporator Water
Connections
Inches (mm)
Center of Gravity
Inches (mm)
Weights
Lbs. (kg)
B
C
X
Y
Z
14.8 (375.9)
14. 8 (375.9)
15.3 (388.6)
15.3 (388.6)
93.5 (2374.9)
93.5 (2374.9)
92.4 (2346.9)
92.4 (2346.9)
43 (1092)
44 (1118)
43 (1092)
44 (1118)
43 (1092)
43 (1092)
40 (1016)
38 (965)
76 (1930)
75 (1905)
75 (1905)
74 (1880)
AGZ 026B through 130B
Shipping
Weight
7580 (3438)
7860 (3565)
8380 (3801)
8710 (3951)
Operating
Weight
7870 (3570)
8150 (3697)
8720 (3955)
9050 (4105)
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.
1
2
3
Description
Evaporator Refrigerant Pressure #1
Evaporator Refrigerant Pressure #2
Condenser Refrigerant Pressure #1
Type
C1
C2
C1
4
Leaving Evaporator Water Temperature
UT
5
Outside Ambient Temperature
UT
6
7
8
Condenser Refrigerant Pressure #2
Reset of Leaving Water Temperature
Demand Limit
C2
UT
UT
9
Compressor Suction Temperature #1
C1
10
Compressor Suction Temperature #2
C2
Signal Source
0.1 to 0.9 VDC
0.1 to 0.9 VDC
0.1 to 0.9 VDC
NTC Thermister
([email protected]°C)
NTC Thermister
([email protected]°C)
0.1 to 0.9 VDC
4-20 mA Current
4-20 mA Current
NTC Thermister
([email protected]°C)
NTC Thermister
([email protected]°C)
Range
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
0-(10 to 80°F)
0-100 % Load
-58 to 212°F
-58 to 212°F
NOTE: C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit
Table 36, Analog Outputs
No.
1
2
IOMM AGZ-5
Description
Fan #1 VFD
Fan #2 VFD
AGZ 026B through 130B
Output Signal
0 to 10 VDC
0 to 10 VDC
Range
20 to 60 Hz
20 to 60 Hz
55
Table 37, Digital Inputs
#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Description
Unit OFF Switch
Pump Down Switch #1
Evaporator Water Flow Switch
Open
Open
Pump Down Switch #2
Open
Open
Phase Voltage Fault #1 (See Note 1)
Phase Voltage Fault #2 (See Note 1)
Ground Fault Prot. #1 (See Note 2 Below)
Ground Fault Prot. #2 (See Note 2 Below)
Remote Start/Stop
Open
Mechanical High Pressure/Motor Protect
Circuit 1
Mechanical High Pressure/Motor Protect
Circuit 2
Ice Mode Switch
Open
Type
UT
C1
UT
Signal
0 VAC (Disable)
0 VAC (Disable)
0 VAC (No Flow)
Signal
24 VAC (Enable)
24 VAC (Enable)
24 VAC (Flow)
C2
0 VAC (Disable)
24 VAC (Enable)
C1
C2
C1
C2
UT
0 VAC (Fault)
0 VAC (Fault)
0 VAC (Fault)
0 VAC (Fault)
0 VAC (Disable)
24 VAC (No Fault)
24 VAC (No Fault)
24 VAC (No Fault)
24 VAC (No Fault)
24 VAC (Enable)
C2
0 VAC (Fault)
24 VAC (No Fault)
C2
0 VAC (Fault)
24 VAC (No Fault)
UT
0 VAC (Cool)
24 VAC (Ice)
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.
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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
56
Description
Alarm
Evaporator Water Pump
Condenser Fan #1
Motor Control Relay #1 =
Compr#1
Motor Control Relay #3 =
Compr#3
Motor Control Relay #5 =
Compr#5
Liquid Line #1
Condenser Fan #2
Motor Control Relay #2 =
Compr#2
Motor Control Relay #4 =
Compr#4
Motor Control Relay #6 =
Compr#6
Liquid Line #2
Condenser Fan #3
Hot Gas Bypass #1
Hot Gas Bypass #2
Condenser Fan #4
Condenser Fan #5 (&#7 on 8
Fans Only)
Condenser Fan #6 (&#8 on 8
Fans Only)
Type
C1,C2,UT
UT
C1
Load
Alarm Indicator
Pump Contactor
Fan Contactor
Output OFF
Alarm OFF
Pump OFF
Fan OFF
Output ON
Alarm ON
Pump ON
Fan ON
C1
Starter
Compressor OFF
Compressor ON
C1
Starter
Compressor OFF
Compressor ON
C1
Starter
Compressor OFF
Compressor ON
C1
C2
Solenoid
Fan Contactor
Cooling OFF
Fan OFF
Cooling ON
Fan ON
C2
Starter
Compressor OFF
Compressor ON
C2
Starter
Compressor OFF
Compressor ON
C2
Starter
Compressor OFF
Compressor ON
C2
C1
C1
C2
C2
Solenoid
Fan Contactor
Solenoid
Solenoid
Fan Contactor
Cooling OFF
Fan OFF
Cooling OFF
Cooling OFF
Fan OFF
Cooling ON
Fan ON
Cooling ON
Cooling ON
Fan ON
C1
Fan Contactor
Fan OFF
Fan ON
C2
Fan Contactor
Fan OFF
Fan ON
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
Unit Mode
OFF
COOL
OFF, ON
COOL, COOL w/Glycol, ICE w/Glycol, TEST
O
O
DIGITAL
INPUT
KEYPAD, BAS, DIGITAL INPUT
O
COOL
COOL, COOL w/GLYCOL, COOL/ICE w/GLYCOL,
ICE w/GLYCOL. TEST
M
Modbus
001
9600
44. 0°F
40. 0°F
10. 0°F
5.0°F
0.5°F
1.0°F
30
35 °F
No
No
BACnet, LonWorks, Modbus
001-999
1200,2400,4800,9600,19200
20.0(40.0) to 60.0 °F
20.0 to 40.0 °F
6.0 to 16.0 °F
1.0 to 10.0 °F
0.5 to 3.0°F
0.5 to 5.0 °F
15 to 300 sec
–2(35) to 60 °F
No,Yes
No,Yes
M
M
M
O
O
O
O
O
M
M
M
M
M
4
120
30
15 min
5 min
No
4,6
90 to 240 sec
20 to 60 sec
10 to 60 min
3 to 20 min
No,Yes
M
M
M
M
M
M
59 psi
59 psi
370 psi
385 psi
38.0 °F
No
No
5 sec
31 to 65 psi
31 to 65 psi
365 to 380 psi
385 to 390 psi
18(37) to 42 °F
No,Yes
No,Yes
3 to 30 sec
M
M
M
M
M
M
M
M
No
4
8
10
12
15
7
6
5
100%
25%
100
1
2
3
No,Yes
4,6,8
1 to 20 oF
1 to 20 oF
1 to 20 oF
1 to 20 oF
1 to 20 oF
1 to 20 oF
1 to 20 oF
90 to 110%
25 to 60%
90 to 130 °F
1 to # Fans Per Circuit
1 to # Fans Per Circuit
1 to # Fans Per Circuit
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
Control source
Available Modes
Display Units
Language
Protocol
Ident number (Modbus only)
Baud rate (Modbus only)
Cool LWT
Ice LWT
Evap Delta T
Startup Delta T
Stop Delta T
Max Pulldown Rate
Evap Recirculate Timer
Low Ambient Lockout
Demand Limit
* Multipoint Power
Compressor
* Number of Compressors
Stage Up Delay
Stage Down Delay
Start-Start
Stop-Start
Clear Cycle Timers
Alarms
Low Evap Pressure-Hold
Low Evap Pressure-Unload
High Condenser Stage Down
High Condenser Pressure
Evaporator Water Freeze
* Phase Voltage Protection
* Ground Fault Protection
Evap Flow Proof
Condenser Fans
VFD Enable
* Number of Fans
Stage Up 2 Deadband
Stage Up 3 Deadband
Stage Up 4 Deadband
Stage Down 0 Deadband
Stage Down 1 Deadband
Stage Down 2 Deadband
Stage Down 3 Deadband
VFD Max Speed
VFD Min Speed
Sat Condenser Temp Target
Forced Fan 1
Forced Fan 2
Forced Fan 3
(*) These items are factory set prior to shipment.
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 Temperature
Mode
Unit Mode = Cool
Unit Mode = Cool w/Glycol
Range
40 to 60°F
20 to 60°F
Evaporator Freeze Temperature
Mode
Unit Mode = Cool
Unit Mode = Cool w/Glycol,
Ice w/Glycol
Range
37 to 42°F
18 to 42°F
Low Evaporator Pressure Hold and Unload
Mode
Unit Mode = Cool
Unit Mode = Cool w/Glycol,
Ice w/Glycol
Range
55 to 65 Psig
31 to 65 Psig
Low Ambient Lockout Temperature
VFD
Range
35 – 60°F
-2 – 60°F
Number of Fans
4
6
8
Range
1 – 2 fans
1 – 3 fans
1 – 4 fans
VFD = N
VFD = Y
Forced Fan 1,2,3
Shutdown Alarms
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
High Condenser Pressure
Condenser Press > High Condenser Pressure SP
Mechanical High Condenser
Pressure/Motor Protect
Digital Input = Off
On Power Up: Delay 150 Sec. before checking
Action
Taken
Rapid Stop
Unit
Rapid Stop
Circuit
Rapid Stop
Circuit
Rapid Stop
Circuit
Phase Voltage Protection (opt.)
If Phase Voltage Protection = Y, Then
Digital Input Off= Phase/Voltage Problem
Rapid Stop
Circuit
Ground Fault Protection (opt.)
If Phase Voltage Protection = Y, Then
Digital Input Off= Phase/Voltage Problem
Rapid Stop
Circuit
Rapid Stop
Circuit
Rapid Stop
Unit
Normal Stop
Unit
Rapid Stop
Circuit
Rapid Stop
Circuit
Normal Stop
Unit
Description
Occurs When:
Evap Pump State = RUN AND Evap Flow Digital
Input = No Flow for time > Evap Flow Proof SP
Evaporator Press < Low Evap Pressure SP for
time > Low Evap Pressure Delay SP
No Evaporator Water Flow
Low Evaporator Pressure
Re-Start Fault
Re-Start = Third Time
Evap. Freeze Protect
Evap LWT < Evaporator Freeze SP AND Unit state
= enable
Leaving Evap. Water Temp.
Sensor Fault
Evaporator Pressure Sensor
Fault
Condenser Pressure Sensor
Fault
Outside Ambient Temp. Sensor
Fault
Sensor shorted or open
Sensor shorted or open
Sensor shorted or open
Sensor shorted or open
Reset
Evap flow switch
closes
manual
manual
manual
Phase/Voltage
Input returns to
normal
manual
manual
manual
manual
manual
manual
manual
NOTE: SP=SetPoint
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
Condenser Pressure Stage
Down
Low Ambient Lockout
Occurs When:
Pressure > High Condenser Stage Down
Setpoint
Any compressor is running AND Outside
Ambient < Low Amb Lockout SP
Action Taken
Shutoff
Stage #2
Shutoff Stages #1
& #2
Low Evaporator Pressure –
Hold
Low Evaporator Pressure –
Unload
Pressure < Low Evap Pressure–Hold
Setpoint
Pressure < Low Evap Pressure–Unload
Setpoint
Hold @
Stage 1
Shutoff
Stage 2
Reset
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)
NOTE: SP = Setpoint
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
ON
ON
ON
ON
ON
ON
Control Source
Setpoint
x
SWITCHES
SWITCHES
KEYPAD
KEYPAD
NETWORK
NETWORK
NETWORK
Remote Input
Keypad Entry
BAS Request
Enable
x
OFF
ON
X
X
x
OFF
ON
x
x
x
OFF
ON
x
x
x
x
x
x
x
x
OFF
x
ON
OFF
OFF
ON
OFF
ON
OFF
OFF
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:
•
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
Mode
Input
Keypad Entry
BAS
Request
x
x
x
x
Available Modes
Setpoint
COOL
Unit Mode
COOL
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.
60
AGZ 026B through 130B
IOMM AGZ-5
Unit Test Mode
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.
Power ON
OFF
TEST: Unit State = AUTO AND
At least one circuit is enabled for start
TEST: Unit State=OFF &
All Comp State=OFF &
NO Evap water freeze condition
OR
Evap water freeze condition
TEST: Unit State=OFF &
All Comp State=OFF &
NO Evap water freeze condition
RUN
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 the start, or stop, is to occur.
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
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. The
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:
Limit Signal vs. Max Stage
(with 4 compressors)
4
3
Max
Stage
2
1
0.0
25.0
50.0
75.0
Limit Signal (%)
100.0
Limit Signal vs. Max Stage
(with 6 compressors)
6
5
4
Max
Stage
3
2
1
0
0
64
16.7
33.3 50.0 66.7
Limit Signal (%)
AGZ 026B through 130B
83.3 100.0
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)
1
2
3
Fans On Cir. 1
1
1,3
1,3,5
Fans On Cir. 2
2
2,4
2,4,6
Fans On Cir 1
1
1,3
1,5,7
1,3,5,7
Fans On Cir. 2
2
2,4
2,6,8
2,4,6,8
8 Fan Units
Stage (2&4-Fan)
1
2
3
4
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
,
Fantrol Stage At Start
> 75 oF
Forced Fan 1 SP
> 90 oF
Forced Fan 2 SP
> 105 oF
Forced Fan 3 SP
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 75oF, 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, Hertz/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.
2
) Keys - Use these keys alternately to move up or down the lists of
Up/Down ( 1 ,
parameter and functions shown in the display, and increment/decrement values.
Store (
) 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
Probable Cause
Condition
•
Is the frequency command source A_01
parameter setting correct?
Is the Run command source A-02
parameter setting correct?
•
•
Is power being supplied to terminals [L1],
[L2], and [L3/N]? If so, the POWER lamp
should be ON.
•
•
Is there an error code E X X displayed?
•
Press the Func. key and determine the error
type. Eliminate the error cause, then clear the
error (Reset).
•
Are the signals to the intelligent input
terminals correct?
Is the Run Command active?
Is the {FW] terminal (or [RV]) connected to
[P24] (via switch, etc.)
•
Verify the terminal functions for C_01 – C_05
are correct.
Turn ON Run Command enable.
Supply 24V to {FW] or [RV] terminal, if
configured.
Has the frequency setting for F_01 been
set greater than zero?
Are the control circuit terminals [H], [O],
and [L] connected to the potentiometer?
•
•
Is the RS (reset) function or FRS (free-run
stop) function ON?
•
Turn OFF the command(s).
•
Is the motor load too heavy?
•
Reduce load, and test the motor
independently.
•
Are the operational settings between the
remote operator and the inverter unit
correct?
•
Check the operator type setting.
•
Are the connections of output terminals
[U/T1], [V/T2], and [W/T3] correct?
Is the phase sequence of the motor
forward or reverse with respect to [U/T1],
[V/T2], and [W/T3]?
•
Make connections according to the phase
sequence of the motor. In general:
FWD = U-V-W, and
REV = U-W-V.
•
Are the control terminals [FW] and [RW]
wired correctly?
•
•
•
Use terminal [FW] for forward, and [RV] for
reverse.
Set motor direction in F_04.
Is parameter F_04 properly set?
•
If using the analog input, is the current or
voltage at [O] or [OI]?
•
Reduce the load.
•
Heavy loads activate the overload restriction
feature (reduces output as needed).
•
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).
Solution
•
•
•
•
•
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.
Set the parameter for F_01 to a safe, nonzero value.
If the potentiometer is the frequency setting
source, verify voltage at [O] > 0V.
•
Is the load too heavy?
•
•
Reduce the load
Heavy loads activate the overload restriction
feature (reduces output as needed).
•
Is the inverter internally limiting the output
frequency?
•
•
Check max frequency setting (A_04).
Check frequency upper limit setting (A_61).
Continued on next page.
70
AGZ 026B through 130B
IOMM AGZ-5
Symptom Condition
The RPM of the motor does
not match the inverter output
frequency setting.
Inverter data is
not correct.
A parameter
will not change
after an edit
(reverts to old
setting).
No
downloads
have
occurred.
A download
to the
inverter was
attempted.
True for
certain
parameters.
True for all
parameters.
Probable Cause
•
Solution
Is the maximum frequency setting A_04
correct?
Does the monitor function D_01 display
the expected output frequency?
•
•
Was power turned OFF after a
parameter edit but before pressing the
Store key?
•
Edit the data and press the Store key once.
•
Edits to data are permanently stores at
power down. Was the time from power
OFF to power ON less than six
seconds?
•
Wait six seconds or more before turning
power OFF after editing data.
•
Was the power turned OFF within six
seconds after the display changed from
REMT to INV?
•
Copy data to the inverter again, and keep
power ON for six seconds or more after
copying.
•
Is the inverter in Run Mode? Some
parameters cannot be edited during
Run Mode.
•
Put inverter in Stop Mode (press the
Stop/reset key). Then edit the parameter.
•
If you’re using the [SFT] intelligent input
(software lock function)is the [SFT]
input ON?
•
Change the state of the SFT input, and
check the B_31 parameter (SFT mode).
•
•
Verify the V/f settings match motor
specification.
Make sure all scaling (such as A_11 to
A_14) is properly set.
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
Name
Cause(s)
Over current event while at constant
speed
E02
E03
Over current event during deceleration
E04
Over current event during
other conditions
E05
Overload protection
E07
Over voltage protection
E08
EEPROM error
E09
Under-voltage error
E11
E22
CPU error
E12
External trip
E13
USP
E14
Ground fault
E15
Input over-voltage
E21
Inverter thermal trip
E35
Thermistor
---U
Under-voltage (brownout) with output
shutoff
Over current event during acceleration
The inverter output was short-circuited, or the motor shaft is locked or
has a heavy load. These conditions cause excessive current for the
inverter, so the inverter output is turned OFF.
The dual-voltage motor is wired incorrectly.
When a motor overload is detected by the electronic thermal 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 problems due to noise or
excessive temperature, the inverter trips and turns OFF its output to
the motor.
A decrease of internal DC bus voltage below a threshold results in a
control circuit fault This condition can also generate excessive motor
heat or cause low torque. The inverter trips and turns 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 configured as EXT has
occurred. The inverter trips and turns OFF the output to the motor.
When the Unattended Start Protection (LJSP) is enabled, an error
occurred when power is applied while a Run signal is present. The
inverter trips and does not go into Run Mode until the error is cleared.
The inverter is protected by the detection of ground faults between the
inverter output and the motor during powerup tests. This feature
protects the inverter, and does not protect humans.
When the input voltage is higher than the specified value, it is
detected 100 seconds after powerup and the inverter trips and turns
OFF its output.
When the inverter internal temperature is above the threshold, the
thermal sensor in the inverter module detects the excessive
temperature of the power devices and trips, 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 trips and
turns OFF the output.
Due to low input voltage, the inverter turns its output OFF and tries to
restart. If it fails 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 (En), or the error code for the
past two trip events (E n-1) and E n-2) using the D_09 Trip History function.
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
VFD Monthly and Yearly Inspection Chart
Item Inspected
Overall
Main
circuit
Display
IOMM AGZ-5
Frequency
Month Year
Inspection Method
Criteria
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
Ambient
environment
Extreme Temperatures &
humidity
Thermometer, hygrometer
Major devices
Abnormal noise &
vibration
Visual & aural
Power supply
voltage
Voltage tolerance
Digital volt meter, measure
between inverter terminals
[L1], [L2], [L3}
Ground Insulation
Adequate resistance
Digital volt meter, GND to
terminals
Mounting
No loose screws
Torque wrench
Components
Housing
Terminal block
Smoothing
capacitor
Overheating
Dirt, dust
Secure connections
Thermal trip events
Visual
Visual
M3: 0.5 – 0.6 Nm
M4: 0.98 – 1.3 Nm
M5: 1.5 – 2.0 Nm
No trip events
Vacuum dust & dirt
No abnormalities
Leading, swelling
Visual
No abnormalities
Relay(s)
Chattering
Aural
Resistors
Cracks or discoloring
Visual
Noise
Dust
No order, discoloring,
corrosion
No leaks or deformation
Legibility
Power down, manually rotate
Visual
Single click when switching
ON or OFF
Use Ohm meter to check
braking resistors
Rotation must be smooth
Vacuum to clean
Visual
No abnormalities
Visual
Visual
Undistorted appearance
All LED segments work
Cooling fan
Control
circuit
Check for ...
Overall
Capacitor
LEDs
AGZ 026B through 130B
5 Meg. Ohms or greater
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
Name
Code
F_01
F_02
F_03
F_04
74
McQuay
Setting
Output Frequency Setting
Acceleration (1)
Deceleration (1)
Keypad Run Key Routing
AGZ 026B through 130B
0.0
10.0
10.0
00
IOMM AGZ-5
Standard Functions
“A” Group Parameters
Function
Code
Name
McQuay
Setting
“A” Group Parameters
Function
Name
Code
A_01
A_02
A_03
Frequency source setting
Run command source setting
Base frequency setting
01
01
60.0
A_53
A_54
A_04
Maximum frequency setting
60.0
A_11
O-L input active range start frequency
A_12
McQuay
Setting
DC braking wait time
DC braking force during deceleration
0.0
0
A_55
DC braking time during deceleration
0.0
A_61
Frequency upper limit setting
0.0
0
A_62
Frequency lower limit setting
0.0
O-L input active range end frequency
0
A_13
O-L input active range start voltage
0
Jump (center) frequency setting
0.0
A_14
O-L input active range end voltage
100
A_15
O-L input start frequency enable
01
A_16
External frequency filter time constant
Jump (hysteresis) frequency width
setting
0.5
8
A_63,
A_65,
A_67
A_64A_66
A_68
A_20
Multi-speed 0 setting
0
A_71
PID Enable
00
A_21
Multi-speed 1 setting
0
A_72
PID proportional gain
1.0
A_22
Multi-speed 2 setting
0
A_73
PID integral time constant
1.0
A_23
Multi-speed 3 setting
0
A_74
PID derivative gain
0.0
A_24
Multi-speed 4 setting
0
A_75
PV scale conversion
1.00
A_25
Multi-speed 5 setting
0
A_76
PV source setting
A_26
Multi-speed 6 setting
0
A_81
AVR function select
00
A_27
Multi-speed 7 setting
0
A_82
AVR voltage select
230/460
A_28
Multi-speed 8 setting
0
A_92
Second acceleration time setting
15.0
A_29
Multi-speed 9 setting
0
A_93
Second deceleration time setting
15.0
A_30
Multi-speed 10 setting
0
A_94
A_31
Multi-speed 11 setting
00
0
Select method to switch to second
accel/decel profile
A_32
Multi-speed 12 setting
0
A_95
Acc1 to Acc2 frequency transition point
0.0
0.0
00
A_33
Multi-speed 13 setting
0
A_96
Dec1 to Dec2 frequency transition
point
A_34
Multi-speed 14 setting
0
A_97
Acceleration curve selection
A_35
Multi-speed 15 setting
00
0
A_98
Deceleration curve selection
A_38
Jog frequency setting
00
1.0
A_39
Jog stop mode
00
A_41
Torque boost method selection
00
A_42
Manual torque boost value
11
A_43
Manual torque boost frequency
adjustment
A_44
V/f characteristic curve selection
00
A_45
V/f gain setting
100
A_51
DC braking enable
00
A_52
DC braking frequency setting
0.5
IOMM AGZ-5
10.0
AGZ 026B through 130B
75
Fine Tuning Functions
Intelligent Terminal Functions
“B” Group Parameters
Function
Code
B_01
B_02
B_03
B_12
Name
Selection of automatic restart
Allowable under-voltage power failure
time
Retry wait time before motor restart
Level of electronic thermal setting
“C” Group Parameters
Function
Code
00
1.0
C_01
C_02
C_03
McQuay
Setting
Name
Terminal [1] function
Terminal [2] function
Terminal [3] function
00
01
16
1.0
C_04
Terminal [4] function
13
Rated
current for
each
inverter
C_05
Terminal [5] function
18
C_11
Terminal [1] active state
00
C_12
Terminal [2] active state
00
C_13
Terminal [3] active state
00
B_13
Electronic thermal characteristic
01
C_14
Terminal [4] active state
B_21
Overload restriction operation mode
01
01
C_15
Terminal [5] active state
00
Rated
current x
1.25
C_21
Terminal [11] function
01
C_22
Terminal [12] function
00
C_23
[FM] signal selection
00
Terminal [11] active state (-FU)
00
B_22
76
McQuay
Setting
Overload restriction setting
B_23
Deceleration rate at overload restriction
1.0
B_31
Software lock mode selection
01
C_31
B_32
Reactive current setting
Rated
current x
0.58
C_32
B_81
{FM] terminal analog meter adjustment
80
C_33
Reserved (-FE / FR)
Terminal [12] active state (-FU)
00
Terminal [11] active state (-FE / FR)
Alarm relay terminal active state
01
Inverter
rated
current
B_82
Start frequency adjustment
0.5
B_83
Carrier frequency setting
5.0
B_84
Initialization mode (parameters or trip
history)
00
C_42
Frequency arrival setting for accel
0.0
B_85
Country code for initialization
02
C_43
Arrival frequency setting for decel
0.0
B_86
Frequency scaling conversion factor
1.0
C_44
PID deviation level setting
3.0
C_91
Debug mode enable
00
B_87
STOP key enable
00
B_88
Restart mode after FRS
00
B_89
Data select for digital op. OPE-J
01
AGZ 026B through 130B
C_41
Overload level setting
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
MENU Key
Air Conditioning
< ALARM
VIEW
<
SET
<
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 (SCROLL) Mode and Keypad Layout
MENU Key
Air Conditioning
VIEW UNIT STATUS
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, cancels any change made to a value and returns to the original
setting.
UP key
Increment, increases the value of the setting
DOWN key Decrement decreases the value of a setting.
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
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
"MENU"
"VIEW" MENUS
VIEW UNIT
VIEW UNIT VIEW CIR #1 VIEW CIR #2
VIEW REFRIG CIR VIEW REFRIG CIR
VIEW FAN S
STATUS (1)
TEMP (1)
STATUS (1)
STATUS (1)
#1 STATUS (1)
#2 STATUS (1)
(1)
VIEW UNIT
VIEW CIR #1
VIEW COMP
TEMP (2)
VIEW UNIT
STATUS (5)
VIEW REFRIG CIR VIEW REFRIG CIR
STATUS (4) #2 STATUS (2)
#1 STATUS (3)
#2 STATUS (2)
VIEW FAN S
(3)
⇐ Continued ⇐
(Right side of matrix continued from above)
"ALARM" MENUS
"SET" MENUS
ALARM LOG
ACTIVE ALARM
SET UNIT
SET COMP
SET ALARM
SET FANS
TEST
(LAST)
(1)
SPs, (1)
SPs (1)
LIMITS (1)
SP(1)
UNIT (1)
TYPE, TIME
TYPE, TIME
SET COMP
ALARM LOG
ACTIVE ALARM
(NEXT TO LAST)
(2)
ALARM LOG
ACTIVE ALARM
SET UNIT
SET ALARM
SET FANS
TEST
LAST 25 SHOWN (n)
SPs, (13)
LIMITS (4)
SP (3)
UNIT (6)
SPs (2)
TYPE, TIME
CLEAR/VIEW
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
the “REFRIGERANT” menu button, the selected data screen will show:
VIEW REFRIG
PSI
SAT EVAP XXX.X
SAT COND XXX.X
°F
XX.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
Analog
(volts
1=XXX.X
STATUS (6)
Outputs
X 100)
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.X oF
Sat Cond= XXX.X oF
VFD Target= XXX.X oF
VIEW REFRG
Suct Temp=
Superheat=
Evap Appr=
CIR 1 (3)
XXX.X oF
XXX.X oF
XX.X oF
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
Stg Error
Cir 1=
Cir 2=
Up
XXX
XXX
(2)
Down
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. The
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
DEFAULT
INCREMENT
DECREMENT
Reset the current field to the value it had when editing began.
Set value to original factory setting.
Increase the value or select the next item in a list.
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)
(data)
(data)
(data)
<D
<C
<+
<-
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 4th 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 4th line is a reminder
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.
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.X oF
Cir 2 Offset= XX.X oF
SET UNIT SPs
(13)
Leaving Evaporator
Water Temp Sensor
Offset= XX.X oF
SET UNIT SPs
(14)
Outside Ambient
Temperature Sensor
Offset= XX.X oF
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
1
2
3
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
Fan 1= Off
Fan 3= Off
Fan 5/7= Off
(4)
TEST UNIT
Fan 2= Off
Fan 4= Off
Fan 6/8= Off
(5)
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
Switch Position
ON
Circuits will operate in the
normal automatic mode
Unit will operate in the
normal automatic mode
OFF
Circuit will go through the
normal pumpdown cycle and
shut off.
Unit will shut off immediately
without pumping down
(emergency stop)
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”.
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
minimum of 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 Adjustment
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, check that unit charge is correct 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 ft2 °F at 75°F.
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.
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
WARNING
Electric shock hazard. Turn off all power before continuing with following service.
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).
96
•
Ambient temperatures above 115°F (46°C) with standard FanTrol control.
•
Check inlet filters periodically and clean as required.
operational.
AGZ 026B through 130B
Verify that the fan is
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
General
Complete unit log and review (Note 3)
Visually inspect unit for loose or damaged components
Inspect thermal insulation for integrity
Clean and paint as required
WEEKLY
Condenser (air-cooled)
Clean condenser coils (Note 4)
Check fan blades for tightness on shaft (Note 5)
Check fans for loose rivets and cracks
Check coil fins for damage
ANNUAL
(Note 2)
X
X
X
X
Electrical
Check terminals for tightness, tighten as necessary
Clean control panel interior
Visually inspect components for signs of overheating
Verify compressor heater operation
Test and calibrate equipment protection and operating controls
Megger compressor motor *
Refrigeration
Leak test
Check sight glasses for clear flow
Check filter-drier pressure drop (see manual for spec)
Perform compressor vibration test
Acid test oil sample
MONTHLY
(Note 1)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Notes:
1. Monthly operations include all weekly operations.
2. Annual (or spring start-up) operations includes all weekly and monthly operations.
3. Log readings can be taken daily for a higher level 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.
*
IOMM AGZ-5
Never Megger motors while they are in a vacuum.
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%
75%
50%
25%
MAXIMUM RECOMMENDED PRESSURE
DROP ACROSS FILTER DRIER PSIG (KPA)
10 (69)
8 (55.2)
5 (34.5)
4 (27.6)
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
AGZ Troubleshooting Chart
PROBLEM
Compressor Will
Not Run
Compressor Noisy
Or Vibrating
High Discharge
Pressure
Low Discharge
Pressure
High Suction
Pressure
Low Suction
Pressure
Compressor Will
Not Stage Up
Compressor
Staging Intervals
Too Short
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
1.
Main switch.
1.
2.
2.
Fuse blown. circuit breakers open
3.
Thermal overloads tripped
4.
Defective contactor or coil.
5.
System shutdown by equipment protection devices
6.
No cooling required
6.
Close switch.
Check electrical circuits and motor windings for shorts or
grounds. Investigate for possible overloading. Replace
fuse or reset breakers after fault is corrected. Check for
loose or corroded connections.
Overloads are auto-reset. Check unit closely when unit
comes back on line. Allow time for auto-reset.
Repair or replace
Determine type and cause of shutdown and correct it
before resetting equipment protection switch.
None. Wait until unit calls for cooling.
7.
Liquid line solenoid will not open
7.
Repair or replace solenoid coil. Check wiring.
8.
Motor electrical trouble
8.
Check motor for opens, shorts, or burnout.
9.
Loose wiring
9.
Check all wire junctions. Tighten all terminal screws.
1.
2.
3.
4.
5.
Low or no refrigerant charge
Compressor running in reverse
Improper piping support on suction or discharge
Worn compressor isolator bushing
Worn Compressor
1.
2.
3.
4.
5.
Repair and recharge
Check unit and compressor for correct phasing
Relocate, add, or remove hangers
Replace
Replace
1.
Noncondensables in system
1.
Extract the noncondensables with approved procedures.
2.
System overcharged with refrigerant
2.
Remove excess, check liquid subcooling.
3.
Optional discharge shutoff valve partially closed
3.
Open valve.
4.
FanTrol wiring not correct
4.
Check FanTrol wiring.
5.
6.
7.
Fan not running
Dirty condenser coil
Air recirculation
5.
6.
7.
Check electrical circuit, Check fan motor.
Clean coil.
Correct.
3.
4.
5.
1.
Refrigerant flood back
1.
Correct.
2.
Wind blowing into coil at low ambient
2.
Shield coil from direct wind, Wind guards are available.
3.
4.
5.
6.
Faulty condenser temperature regulation
Insufficient refrigerant in system
Low suction pressure
Only one compressor operating
3.
4.
5.
6.
Check condenser control operation.
Check for leaks. Repair and add charge.
See corrective steps for Low Suction Pressure.
See corrective steps for Compressor Will Not Stage Up.
1.
Excessive water temperature
1.
Check control settings.
2.
Excessive load
2.
Reduce load or add additional equipment.
3.
Expansion valve overfeeding
3.
Check remote bulb. Regulate superheat.
4.
Compressors running in reverse
4.
Check for proper phasing.
1.
Rapid load swings
2.
Lack of refrigerant
1.
2.
3.
Clogged liquid line filter drier
3.
Stabilize load.
Check for leaks, repair, add charge. Check liquid sight
glass.
Check pressure drop across filter drier. Replace.
4.
Expansion valve malfunctioning
4.
Check and reset for proper superheat.
5.
Condensing temperature too low
6.
Compressor will not unload
5.
6.
7.
Insufficient water flow
8.
Evaporator head ring gasket slippage
9.
10.
Evaporator dirty
Rapid load swings
9.
10.
Check means for regulating condenser temperature.
See corrective steps for Compressor Staging Intervals
Too Low.
Adjust flow.
Take pressure drop across vessel and contact factory to
obtain design pressure drop for that vessel.
Clean chemically.
Stabilize load.
1.
Defective capacity control
1.
Replace.
2.
Faulty thermostat stage or broken wire
2.
Replace.
3.
Stages not set for application
3.
Reset thermostat setting for application.
7.
8.
1.
Thermostat control band not set properly
1.
Set control band wider.
2.
Faulty water temperature sensor
2.
Replace.
3.
4.
Insufficient water flow
Rapid load swings
3.
4.
Adjust flow.
Stabilize load.
Table continued on next page.
IOMM AGZ-5
AGZ 026B through 130B
101
PROBLEM
Compressor Oil
Level Too High Or
Too Low
Compressor Loses
Oil
Motor Overload
Relays or Circuit
Breakers Open
Compressor
Thermal Protection
Switch Open
102
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
1.
Oil hang-up in piping
1.
Review refrigerant piping and correct.
2.
Low oil level
2.
Check and add oil.
3.
Loose fitting on oil line
3.
Check and tighten system.
4.
Level too high
4.
Adjust thermal expansion valve.
5.
6.
Insufficient water flow - Level too high
Excessive liquid in crankcase - Level too high
5.
6.
7.
Short cycling
7.
Adjust flow.
Check crankcase heater. Reset expansion valve for
higher superheat. Check liquid line solenoid valve
operation.
Stabilize load or increase staging interval.
1.
Lack of refrigerant
1.
Check for leaks and repair. Add refrigerant
2.
Suction superheat too high
2.
Adjust superheat.
3.
Crankcase heater burnout
3.
Replace crankcase heater.
1.
Low voltage during high load conditions
1.
Check supply voltage for excessive line drop.
2.
Defective or grounded wiring in motor
2.
Replace compressor motor.
3.
4.
5.
Loose power wiring or burnt contactors
High condenser temperature
Power line fault causing unbalanced voltage
3.
4.
5.
Check all connections and tighten.
See corrective steps for High Discharge Pressure.
Check supply voltage. Notify power company. Do not
start until fault is corrected..
1.
2.
Operating beyond design conditions
Discharge valve partially shut
1.
2.
Add facilities so conditions are within allowable limits.
Open valve.
3.
Blown compressor internal gasket
3.
Replace gasket.
4.
5.
6.
Voltage range or imbalance
High superheat
Compressor bearing failure
4.
5.
6.
Check and correct.
Adjust to correct superheat.
Replace compressor .
AGZ 026B through 130B
IOMM AGZ-5
IOMM AGZ-5
AGZ 026B through 130B
103
104
AGZ 026B through 130B
IOMM AGZ-5
This document contains the most current product information as of this printing. For the most up-todate product information, please go to www.mcquay.com.
Post Office 2510, Staunton, Virginia 24402 USA • (800) 432-1342 • www.mcquay.com
IOMM AGZ-5 (10/04)
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