McQuay AGZ 026B Installation Manual
Installation, Operation and Maintenance Manual
Air-Cooled Scroll Compressor Chiller
AGZ 026B through 130B
60 Hertz, R-22
IOMM A G Z- 5
Group: Chiller
Part Number: 330411801
Effective: October 2004
Supercedes: IOMM A GZ -4
Table of Contents
Introduction.......................................3
General Description......................................3
Inspection.....................................................3
Nomenclature...............................................3
Installation......................................... 4
Handling.......................................................4
Location........................................................5
Vibration Isolators......................................12
Ambient and Water Flow Limitations.........14
Water Piping...............................................14
Flow Switch................................................16
Water Connections......................................17
System Water Volume Considerations........17
Variable Speed Pumping ............................17
Glycol Solutions.........................................17
Evaporator Flow and Pressure Drop...........21
Wind Baffles and Hail Guards....................23
Optional Features............................25
Physical Data ...................................28
Electrical Data - Standard Ambient33
Electrical Data - High Ambient......43
Compressor Control................................... 61
Condenser Fan Control.............................. 65
Optional Low Ambient VFD...................... 67
Using the Controller .................................. 77
Startup..............................................91
Pre Start-up................................................ 91
Start-Up ..................................................... 91
Shutdown................................................... 92
Water Piping Checkout.............................. 92
Refrigerant Piping Checkout...................... 92
Electrical Check Out.................................. 93
Operation..........................................93
Hot Gas Bypass (Optional)........................ 93
VFD Low Ambient Control (Optional)...... 94
Filter-Driers............................................... 94
System A djustment.................................... 94
Liquid Line Sight Glass............................. 94
Refrigerant Charging ................................. 95
Thermostatic Expansion Valve .................. 95
Crankcase Heaters ..................................... 95
Evaporator ................................................. 95
Unit Maintenance.............................96
Preventive Maintenance Schedule............. 97
Dimensional Data............................ 51
MicroTech II Controller .................54
Controller Section Table of Contents.........54
Overview....................................................55
General Description....................................55
Logging......................................................59
Control Logic.............................................60
Chilled Water Pump Control ......................61
This manual also replaces
Our facility is ISO Certified
"McQuay" is a registered trademark of McQuay International
Illustrations and data cover McQuay International products at the time of publication and we reserve the right to
make changes in design and construction at anytime without notice.
2002 McQuay International
Service...............................................98
Liquid Line Solenoid Valve....................... 98
Evaporator ................................................. 99
Refrigerant Charging ................................. 99
Warranty Statement ......................100
AGZ Troubleshooting Chart.........101
IOMM AGR-1
2 AGZ 026B through 130B IOMM AGZ-5
Introduction
General Description
McQuay Air-Cooled Global Water Chillers are complete, self-contained automatic
refrigerating units. Every unit is completely assembled, factory wired, charged, and
tested. Each unit consists of twin air-cooled condensers with integral subcooler
sections, two tandem or triple scroll compressors, brazed-plate or replaceable tube,
dual circuit shell-and-tube evaporator, and complete refrigerant piping. Liquid line
components include manual liquid line shutoff valves, sight-glass/moisture indicators,
solenoid valves, and thermal expansion valves. Other features include compressor
crankcase heaters, an evaporator heater for chilled water freeze protection, limited
pumpdown during “on” or “off” periods, automatic compressor lead-lag to alternate the
compressor starting sequence, and sequenced starting of compressors.
The electrical control center includes all equipment protection and operating controls
necessary for dependable automatic operation. Condenser fan motors are protected in
all three phases and started by their own three-pole contactors.
Inspection
Check all items carefully against the bill of lading. Inspect all units for damage upon
arrival. Report shipping damage and file a claim with the carrier. Check the unit
nameplate before unloading, making certain it agrees with the power supply available.
McQuay is not responsible for physical damage after the unit leaves the factory.
Note: Unit shipping and operating weights are available in the Physical Data
tables beginning on page 28.
Nomenclature
A G Z - XXX B S
Scroll Compressor
Air-Cooled
Global
Application
S= Standard Cooling
M= Remote Evaporator
Design Vintage
Model Size
(Nominal Tons)
IOMM AGZ-5 AGZ 026B through 130B 3
Installation
Note: Installation is to be performed by qualified personnel who are familiar
with local codes and regulations.
WARNING
Sharp edges on unit and coil surfaces are a potential hazard to personal safety.
Avoid contact with them.
Handling
Be careful to avoid rough handling of the unit. Do not push or pull the unit from
anything other than the base. Block the pushing vehicle away from the unit to prevent
damage to the sheet metal cabinet and end frame (see Figure 1).
To lift the unit, 2 1/2" (64mm) diameter lifting tabs are provided on the base of the
unit. Arrange spreader bars and cables to prevent damage to the condenser coils or
cabinet (see Figure 2).
Figure 1, Suggested Pushing Arrangement
Blocking is required
across full width
Figure 2, Suggested Lifting Arrangement
Number of fans may vary
from this diagram. The lifting
Spreader bars
Spreader bars
required
required
(use caution)
(use caution)
method will remain the same.
All rigging locations
must be used.
4 AGZ 026B through 130B IOMM AGZ-5
Location
A
A
Unit Placement
AGZ units are for outdoor applications and
can be mounted either on a roof or at ground
Figure 3, Clearances
SEE ATTACHED TABLE
DIMENSION “A”
level. For roof mounted applications, install
the unit on a steel channel or I-beam frame to
support the unit above the roof. For ground
level applications, install the unit on a
4 FT. (1220mm)
CLEARANCE FOR
SERVICE ACCESS
substantial base that will not settle. A onepiece concrete slab with footings extended
below the frost line is recommended. Be sure
the foundation is level within 1/2" (13mm)
SEE ATTACHED TABLE
DIMENSION “A”
over its length and width. The foundation
must be strong enough to support the weights
listed in the Physical Data Tables beginning on page 28.
Table 1, Recommended Minimum Clearances
Model Size
026B – 070B 4 (1.2) 8 (2.4) 6 (1.8) 4 (1.2) 4 (1.2)
075B – 130B 6 (1.8) 12 (3.6) 8 (2.4) 4 (1.2) 4 (1.2)
Coil Side “A”
ft (m)
“B”
ft (m)
“C”
ft (m)
End Opposite
Controls ft (m)
Control Panel End
Clearances
Do not block the flow of air to and
from the condenser coil. Restricting
airflow or allowing air recirculation
will result in a decrease in unit
performance and efficiency because
discharge pressures are increased.
There must be no obstruction above
the unit that would deflect discharge
air downward where it could be
recirculated back to the inlet of the
condenser coil. The condenser fans
are propeller type and will not
operate with ductwork.
Install the unit with enough side
clearance for air to enter the coil and
for servicing. Provide service access
to the evaporator, compressors,
electrical control panel and piping
components.
Do not allow debris to accumulate
near the unit where it could be drawn
into the condenser coil. Keep
condenser coils and fan discharge
free of snow or other obstructions to
permit adequate airflow for proper
operation.
AIR FLOW
The recommended minimum side clearance be tween two units
is dimension “B’ in table on this page.
AIR FLOW
The unit must not be installed in a pit or encl osure that is
deeper or taller than the height of the unit unless extra space
is provided. The minimum clearance on each
side of the unit is dimension “C” in tabl e on this page.
AIR
DISCHARGE
AIR FLOW
DISCHARGE
“C” “C”
ft. (m)
“B”
AIR
4 FT. (1220)
CLEARANCE FOR
SERVICE ACCESS
AIR
DISCHARGE
IR FLOW
IR FLOW
IOMM AGZ-5 AGZ 026B through 130B 5
Restricted Air Flow
General
The clearances required for design-life operation of AGZ air-cooled condensers are
described in the previous section. Occasionally, these clearances cannot be maintained
due to site restrictions such as units being too close together or a fence or wall
restricting airflow, or both.
Fortunately, the McQuay AGZ chillers have several features that can mitigate the
problems attributable to restricted airflow.
• The condenser section is shaped as shown Figure 4. This allows inlet air for these
coils to come in from either side. A vertical coil and its adjacent angled coil are
manifolded together to serve one refrigerant circuit.
• The MicroTech II control is proactive in response to “off-design conditions”. In
the case of single or compounded influences restricting airflow to the unit, the
microprocessor will act to keep the compressor(s) running (possibly at reduced
capacity) rather than allowing a shut-off on high discharge pressure.
• The MicroTech II control can be programmed to sequence the compressors in the
most advantageous way. For example, in the diagram shown below, it might be
desirable to program circuit #1 to be the lag circuit (last circuit to reach full load)
during periods of high ambient temperatures.
Figure 4, Coil and Fan Arrangement
Building
Circuit #1 Circuit #2
NOTE: Models AGZ 026 to 035 do not have an interior slanted coil.
The following sections discuss the most common situations of condenser air restriction
and give capacity and power adjustment factors for each. Note that in unusually severe
conditions, the MicroTech II controller would adjust the unit operation to remain
online until a less severe condition is reached.
6 AGZ 026B through 130B IOMM AGZ-5
Case 1, Building or Wall on One Side of One Unit
A
The existence of a screening wall or the wall of a building in close proximity to an air-cooled
chiller is common in both rooftop and ground level applications. Hot air recirculation on the
coils adjoining the wall will increase compressor discharge pressure, decreasing capacity and
increasing power consumption. Only the compressor(s) connected to these coils will be
affected. Circuits opposite the wall are unaffected.
When close to a wall, it is desirable to place chillers on the north or east side of them. It is
also desirable to have prevailing winds blowing parallel to the unit’s long axis. The worst
case is to have wind blowing hot discharge air into the wall.
Figure 5, Unit Adjacent to Wall
H
Figure 6, Adjustment Factors
3.0
2.0
1.0
.5
D
GZ
075-130
4.5 ft.
(1.4m)
6 ft.
(1.8m)
8 ft.
(2.4m)
AGZ
026-070
3.5 ft.
(1.0m)
4 ft.
(1.2m)
6 ft.
(1.8m)
4.0
3.0
2.0
AGZ
6 ft.
8 ft.
AGZ
026-070
3.5 ft.
(1.0m)
4 ft.
(1.2m)
6 ft.
(1.8m)
075-130
4.5 ft.
(1.4m)
(1.8m)
(2.4m)
0
0
IOMM AGZ-5 AGZ 026B through 130B 7
Case 2, Two Units Side By Side
A
A
A
A
Two or more units sited side by side are common. If spaced closer than 12 feet (3.7 meters) or
8 feet (2.5meters) depending on size, it is necessary to adjust the performance of each unit;
circuits adjoining each other are affected. NOTE: This case applies only to two units side by
side. See Case 3 for three or more parallel units. If one of the two units also has a wall
adjoining it, see Case 1. Add the two adjustment factors together and apply to the unit located
between the wall and the other unit.
Mounting units end to end will not necessitate adjusting performance. Depending on the
actual arrangement, sufficient space must be left between the units for access to the control
panel door opening and/or evaporator tube removal. See “Clearance” section of this guide for
requirements for specific units.
Figure 7, Two Units Side by Side
Figure 8, Adjustment Factor
3.0
2.0
1.0
0
GZ 075-130
GZ 026-070
9
(2.7)
6.5
(2.0)
10
(3.0)
7
(2.1)
11
(3.3)
7.5
(2.2)
12
(3.6)
8
(2.4)
GZ 075-130
GZ 026-070
6.0
4.0
2.0
0
9
(2.7)
6.5
(2.0)
10
(3.0)
7
(2.1)
11
(3.3)
7.5
(2.2)
12
(3.6)
8
(2.4)
8 AGZ 026B through 130B IOMM AGZ-5
Case 3, Three or More Units Side By Side
A
A
A
A
When three or more units are side by side, the outside chillers (1 and 3 in this case) are
influenced by the middle unit only on their inside circuits. Their adjustment factors will be the
same as Case 2. All inside units (only number 2 in this case) are influenced on both sides and
must be adjusted by the factors shown below.
Figure 9, Three or More Units
GZ 075-130
GZ 026-070
Chiller 1 Chiller 2 Chiller 3
Figure 10, Adjustment Factor
4.0
3.0
2.0
1.0
0
15
(4.6)
11
(3.3)
16
(4.9)
12
(3.7)
17
(5.2)
13
(4.0)
18
(5.5)
14
(4.3)
GZ 075-130
GZ 026-070
8.0
6.0
4.0
2.0
0
15
(4.6)
11
(3.3)
16
(4.9)
12
(3.7)
17
(5.2)
13
(4.0)
18
(5.5)
14
(4.3)
IOMM AGZ-5 AGZ 026B through 130B 9
Case 4, Open Screening Walls
Decorative screening walls are often used to help conceal a unit either on grade or on a rooftop.
These walls should be designed such that the combination of their open area and distance from
the unit do not require performance adjustment. It is assumed that the wall height is equal to or
less than the unit height when mounted on its base support. This is usually satisfactory for
concealment. If the wall height is greater than the unit height, see Case 5, Pit Installation.
The distance from the ends of the unit to the end walls should be sufficient for service, opening
control panel doors, and pulling evaporator tubes, as applicable.
If each side wall is a different distance from the unit, the distances can be averaged providing
either wall is not less than 8 feet (2.4 meters) from the unit. For example, do not average 4 feet
and 20 feet to equal 12 feet.
Figure 11, Open Screening Walls
Figure 12, Wall Free Area vs Distance
AGZ
026-070
4
(1.2)
3.5
(1.0)
3.0
(0.9)
2.5
(0.7)
AGZ
075-130
6
(1.8)
5
(2.0)
4
(1.2)
3
(0.9)
01020304050
10 AGZ 026B through 130B IOMM AGZ-5
Case 5, Pit/Solid Wall Installation
Pit installations can cause operating problems and great care should be exercised if they are
to be used on an installation. Recirculation and restriction can both occur. A solid wall
surrounding a unit is substantially the same as a pit and the data presented here should be
used.
Steel grating is sometimes used to cover a pit to prevent accidental falls or trips into the pit.
The grating material and installation design must be strong enough to prevent such accidents,
yet provide abundant open area or serious recirculation problems will occur. Have any pit
installation reviewed by McQuay application engineers prior to installation to make sure it
has sufficient air-flow characteristics. The installation design engineer must approve the
work to avoid the risk of accident.
Figure 13, Pit Installati on
Figure 14, Adjustment Factor
D=4
(1.4)
D=6
(1.8)
D=5
(2.0)
D=8
(2.4)
075-130
D=10
AGZ
026-070
AGZ
075-130
AGZ
(3.1)
AGZ
026-070
D=7
(2.1)
D=4
(1.4)
D=6
(1.8)
D=5
(2.0)
D=8
(2.4)
AGZ
075-130
D=10
(3.1)
AGZ
026-070
D=7
(2.1)
AGZ
026-070
AGZ
075-130
IOMM AGZ-5 AGZ 026B through 130B 11
Sound Isolation
N
The low sound level of the AGZ chiller is suitable for most applications. When additional
sound reduction is necessary, locate the unit away from sound sensitive areas. Avoid
locations beneath windows or between structures where normal operating sounds may be
objectionable. Reduce structurally transmitted sound by isolating water lines, electrical
conduit and the unit itself. Use wall sleeves and rubber isolated piping hangers to reduce
transmission of water or pump noise into occupied spaces. Use flexible electrical conduit to
isolate sound transmission through electrical conduit. Spring isolators are effective in
reducing the low amplitude sound generated by scroll compressors and for unit isolation in
sound sensitive areas.
Vibration Isolators
Vibration isolators are recommended for all roof mounted installations or wherever
vibration transmission is a consideration. Table 2 lists isolator loads for all unit sizes.
Neoprene-in-Shear Dimensions
Color Code L W H B C D
Gray 5.5 3.37 1.75 0.5 4.12 0.56
Black, Red 6.25 4.62 1.62 0.5 5.0 0.56
Spring Isolator Dimensions
Figure 15 shows isolator locations. See Dimensional Data starting on page 51 for detailed
mounting hole locations.
Isolators are also recommended for slab installations, primarily to keep the unit base from
resting its entire length directly on the slab.
Isolator Installation
The unit should be initially installed on shims or blocks at the listed free height. When all
piping, wiring, flushing, charging, etc. is completed, adjust the springs upward to load
them and to provide clearance to remove the shims or blocks.
Installation of spring isolators requires flexible piping connections and at least three feet of
conduit flex tie-ins. Piping and conduit must be supported independently of the unit.
Figure 15, Isolator Locations
6 FAN UNIT 8 FAN UNIT
CONTROL
PANEL
34
CONTROL
PANEL
12
45
12
OTE: 4-fan uni ts are same as 6-fan units . See Table 2 for number of fans and mounting location weights.
12 AGZ 026B through 130B IOMM AGZ-5
6
3
Table 2, AGZ-BS, Isolator Loads At Each Mounting Location (With Aluminum Fins)
No.
Unit
Size
026B 4 1281 580 941 426 1020 462 748 339 - - - - 3990 1807 72 32
030B 4 1297 588 952 431 1032 467 759 344 - - - - 4040 1830 72 32
035B 4 1283 581 942 427 1069 484 786 356 - - - - 4080 1848 72 32
040B 4 1360 616 940 426 1082 490 748 339 - - - - 4130 1871 72 32
045B 4 1377 624 952 431 1148 520 793 359 - - - - 4270 1934 72 32
050B 4 1384 627 1016 460 1153 522 847 384 - - - - 4400 1993 119 54
055B 4 1391 630 1085 492 1159 525 905 410 - - - - 4540 2057 119 54
060B 4 1410 639 1099 498 1175 532 916 415 - - - - 4600 2084 142 65
065B 4 1382 626 1214 550 1205 546 1059 480 - - - - 4860 2202 142 65
070B 4 1419 643 1246 564 1238 561 1087 492 - - - - 4990 2260 217 99
075B 6 1854 840 1411 639 1854 840 1411 639 - - - - 6530 2958 217 99
085B 6 1942 880 1479 670 1856 841 1413 640 - - - - 6690 3031 217 99
090B 6 1975 895 1450 657 1975 895 1450 657 - - - - 6850 3103 217 99
100B 8 1464 663 1341 607 1219 552 1400 634 1282 581 1164 527 7870 3565 289 131
110B 8 1513 685 1358 615 1204 545 1513 685 1358 615 1204 545 8150 3692 289 131
120B 8 1656 750 1486 673 1317 597 1582 717 1420 643 1259 570 8720 3950 289 131
130B 8 1714 776 1508 683 1303 590 1714 776 1508 683 1303 590 9050 4100 289 131
of
Fans
1 2 3 4 5 6 Total Unit
lb kg lb kg lb kg lb kg lb kg lb kg lb kg lb. kg
NOTE (1): Additional weight for copper coils is per mounting location.
(1) Copper
Fin Add
Table 3, Isolator Kit Numbers
AGZ
Model
Spring Kit
Part No.
R-I-S Kit
Part No.
026, 030
035
330349603 330349603 330349605 330349606 330349607 330349609 330349612 330349613 330349614
330349702 330349703 330349704 330349704 330349705 330349706 330349707 330349708 330349709
040, 045
050
055 060 065, 070
075, 085
090
100 110 120,130
Table 4, Isolator Locations
AGZ-B, Chillers
Operating Weight. Neoprene-In-Shear Mountings Spring-Flex Mountings
Unit
Size
026B 3990 1807
030B 4040 1830
035B 4080 1848
040B 4130 1871
045B 4270 1934
050B 4400 1993
055B 4540 2057
060B 4600 2084
065B 4860 2202
070B 4990 2260
075B 6530 2958
085B 6690 3031
090B 6850 3103
100B 7870 3565
110B 8150 3692
120B 8720 3950
130B 9050 4100
NOTES:
1. Neoprene-in-shear isolators: Gray=RP-3 Gray, Black=RP-4 Black, Red=RP-4 Red.
lbs kg
1 2 3 4 5 6 1 2 3 4 5 6
Black Gray Gray Gray - - Orange Purple Purple Red - Black Gray Gray Gray - - Orange Purple Purple Red - Black Gray Gray Gray - - Orange Purple Purple Red - Black Gray Black Gray - - Orange Purple Purple Red - Black Gray Black Gray - - Orange Purple Purple Red - Black Gray Black Gray - - Orange Purple Purple Red - Black Black Black Gray - - Orange Purple Purple Purple - Black Black Black Gray - - Orange Purple Orange Purple - Black Black Black Black - - Orange Orange Orange Purple - Black Black Black Black - - Orange Orange Orange Purple - -
Red Black Red Black - - Gray Orange Gray Orange - Red Black Red Black - - Gray Orange Gray Orange - Red Black Red Black - - Gray Orange Gray Orange - -
Black Black Black Black Black Black Orange Orange Orange Orange Orange Orange
Red Black Black Red Black Black Green Orange Orange Green Orange Orange
Red Red Black Red Red Black Green Green Orange Green Green Orange
Red Red Black Red Red Black Green Green Orange Green Green Orange
IOMM AGZ-5 AGZ 026B through 130B 13
Ambient and Wa ter Flow Limitations
AGZ units are designed to operate in temperatures as show in the following table.
Table 5, Unit Maximum Operating Ambient Temperature
AGZ Unit Model
AGZ 026B – 130B
Standard
Controls
115°F 105°F 125°F
The VFD Low Ambient Control Option on models AGZ 026B to 130B imposes an additional heat
load on the control panel limiting operation to 105°F ambient temperature. The addition of the
High Ambient Panel Option allows operation to 125°F ambient temperature.
Compressor loading and unloading is adaptively determined by system load, ambient air
temperature, and other inputs to the MicroTech II control algorithms. A low ambient fan VFD
option allows operation down to 0°F (-18°C). The minimum ambient temperature is based on still
conditions where the wind is not greater than five mph. Greater wind velocities will result in
reduced discharge pressure, increasing the minimum operating ambient temperature. Field installed
hail/wind guards are available to allow the chiller to operate effectively down to the ambient
temperature for which it was designed.
Evaporator flow rates below the minimum values can result in laminar flow causing freeze-up
problems, scaling and poor control. Flow rates above the maximum values will result in
unacceptable pressure drops and can cause excessive erosion, potentially leading to failure.
w/ Low Ambient
VFD Control Option
w/ or w/o Low Ambient VFD Control
Plus High Ambient P anel Option
Water Piping
Local authorities can supply the installer with the proper building and safety codes required for safe
and proper installation.
Install piping with minimum bends and changes in elevation to minimize pressure drop. The following
issues must be considered when designing and installing water piping:
1. Vibration eliminators to reduce vibration and noise transmission to the building.
2. Shutoff valves are required to isolate the unit from the piping during unit servicing.
3. Manual or automatic air vent valves at the high points of the system. Drains must be installed at
the lowest points in the system.
4. Adequate water pressure must be maintained (expansion tank or regulating valve).
5. Temperature and pressure indicators located at the unit are required to aid in unit servicing.
6. A strainer or other means of removing foreign matter from the water before it enters the pump must
be installed. Place the strainer far enough upstream to prevent cavitation at the pump inlet (consult
pump manufacturer for recommendations). The use of a strainer will prolong pump life and keep
system performance up.
7. A strainer must
prevent foreign material from entering and decreasing the evaporator performance.
8. The unit’s evaporator has a thermostat and heater to prevent freeze-up down to -20°F (-29°C).
The heating cable can be wired to a separate 115V supply circuit. As shipped from the factory, the
heating cable is wired to the control circuit. All water piping to the unit must also be protected to
prevent freezing.
be installed in the water line before the inlet of the evaporator. This will help
14 AGZ 026B through 130B IOMM AGZ-5
CAUTION
If separate disconnect is used for the 115V supply to the evaporator heating cable,
mark the disconnect clearly to ensure the disconnect is not accidentally shut off during
cold seasons causing a possible damaging evaporator freeze-up.
9. If the unit is used as a replacement chiller, flush the system thoroughly before unit
installation. Regular water analysis and chemical water treatment for the
evaporator loop is recommended immediately at equipment start-up.
10. The total water volume in the system should be sufficient to prevent frequent “onoff” cycling. Turnover rate should not be less than 4 minutes for normal variable
cooling loads.
11. When glycol is added to the water system for freeze protection, the refrigerant
suction pressure will be lower, cooling performance less, and water side pressure
drop greater. If the percentage of glycol is high, or if propylene is used instead of
ethylene glycol, the added pressure drop and loss of performance could be
substantial. When Glycol or Ice are selected as Unit Mode, the MicroTech II will
automatically reset the available range for the Leaving Water Temperature,
Freezestat and Evaporator Pressure settings.
12. Reset the freezestat setting to approximately 4 to 5 degrees F (2.3 to 2.8 degrees C)
below the leaving chilled water setpoint temperature. See the section titled
“Glycol Solutions” for additional information concerning glycol.
13. Perform a preliminary leak check before insulating the piping and filling the
system.
14. Piping insulation should include a vapor barrier to prevent condensation and
possible damage to the building structure.
Figure 16, AGZ 075 – AGZ 130, Typical Field Evaporator Water Piping
THERMOWELL
T
INLET
T
IOMM AGZ-5 AGZ 026B through 130B 15
Figure 17, AGZ 026 - AGZ 070, Typical Field Evaporator Water Piping
A
ir
T
Inlet
Outlet
T
Thermowell
Vent
P
Drain
Vibration
Eliminators
Strainer
Isolation
Valves
Flow
Switch
NOTE: Outdoor piping must be protected if freezing temperatures are a possibility.
Flow Switch
Mount a water flow switch in the leaving water line to shut down the unit when water
flow is interrupted. A flow switch is an equipment protection control and should never
be used to cycle a unit.
A “paddle” type flow switch is available from McQuay (part number 017503300).
Certain minimum flow rates are required to close the switch and are listed in Table 6.
Installation should be as shown in Figure 18. Connect the normally open contacts of
the flow switch in the unit control center at terminals 44 and 61. There is also a set of
normally closed contacts on the switch that can be used for an indicator light or an
alarm to indicate when a “no flow” condition exists. Freeze protect any flow switch
that is installed outdoors. Manufacturer’s instructions included with the switch should
be followed.
NOTE: Differential pressure switches are not recommended for outdoor installation.
They can freeze and not indicate a no-flow condition.
Table 6, Flow Switch Minimum/Maximum Flow Rat es
Nominal Pipe Size
Inches (mm)
2 (50.8) 13.7 (51.8) 105 (397.4)
2 1/2 (63.50 17.9 (67. 8) 149 (564.0)
3 (76.20 24.2 (91.6) 230 (870.6)
4 (101.6) 35.3 (134.0) 397 (1502.7)
5 (127.0) 48.6 (184.0) 654 (2475.4)
6 (152.4) 60.3 (228.0) 900 (3406.5)
Note: See pressure drop table on page 18 for minimum and m axim um flow through the evaporator.
Minimum Required Flow To
Activate Switch - gpm (l/m)
Maximum Safe Flow Rate
gpm (l/m)
Figure 18, Flow Switch Instal lation
Flow direction marked on switch
1" (25mm) NPT flow switch
connection
Tee
16 AGZ 026B through 130B IOMM AGZ-5
Water Connections
T
D
Bring water piping to the evaporator through the side between the vertical supports.
Provide taps for the connection of pressure gauges and thermometers in the inlet and
outlet lines. Check the inlet and outlet labels on the unit against the certified drawings
supplied on the job and be sure the water piping is hooked up correctly. Contact the
McQuay sales office if any discrepancies exist.
System Water Volume Considerations
All chillers need adequate time to recognize a load change, respond to the change and
stabilize without short cycling the compressor. The water volume in the system and the
size of the piping loop is a critical consideration. Good engineering practice is to have
a minimum water volume of four times the flow rate (GPM) for comfort cooling
applications. For process applications where the load can change quickly, contact the
local McQuay sales office for recommendations. A water storage tank (provided by
others) may be required to increase the system water volume in some systems.
Since there are many other factors that can influence performance, systems can
successfully operate below these suggestions. However, as the water volume decreases
below these suggestions, the possibility of problems increases. We believe that these
guidelines should be an industry standard and not just recommendations from McQuay.
Variable Speed Pumping
Variable water flow involves reducing the water flow through the evaporator as the
load decreases. McQuay chillers are designed for this duty provided that the rate of
change in water flow is not greater than 10 percent of the change per minute.
The water flow through the vessel must remain between the minimum and maximum
values listed on page 22. If flow drops below the minimum allowable, large reductions
in heat transfer can occur. If the flow exceeds the maximum rate, excessive pressure
drop and tube erosion can occur.
Glycol Solutions
The use of a glycol/water mixture in the evaporator to prevent freezing will reduce
system capacity and efficiency, as well as increase pressure drop. The system capacity,
required glycol solution flow rate, and pressure drop with glycol may be calculated
using the following formulas and tables.
1. Capacity – Multiply the capacity based on water by the Capacity correction factor
from Table 7 through Table 10.
2. Flow – Multiply the water evaporator flow by the Flow correction factor from
Table 7 through Table 10 to determine the increased evaporator flow due to glycol.
If the flow is unknown, it can be calculated from the following equation:
)(24
×
=
CapacitykW
elta
−×=18.4
For Metric Applications
(gpm) Flow Glycol FactorCorrectionFlow
– Use the following equation for metric applications:
(l/s) Flow Glycol
3. Pressure drop -- Multiply the water pressure drop from page 22 by Pressure Drop
correction factor from Table 7 through Table 10. High concentrations of propylene
glycol at low temperatures may cause unacceptably high pressure drops.
4. Power -- Multiply the water system power by Power correction factor from Table 7
through T able 10.
glycolCapacityTons
TDelta
−
×
×
FactorCorrectionFlow
)
IOMM AGZ-5 AGZ 026B through 130B 17
Test coolant with a clean, accurate glycol solution hydrometer (similar to that found in
service stations) to determine the freezing point. Obtain percent glycol from the
freezing point table below. It is recommended that a minimum of 25% solution by
weight be used for protection against corrosion or that additional compatible inhibitors
be added.
Concentrations above 35 percent do not provide any additional burst protection and
should be carefully considered before using.
CAUTION
Do not use an automotive grade antifreeze. Industrial grade glycols must be used.
Automotive antifreeze contains inhibitors which will cause plating on the copper tubes
within the chiller evaporator. The type and handling of glycol used must be consistent
with local codes.
Table 7, Ethylene Glycol Factors for Models AGZ 026B to 070B
% E.G.
10 26 -3.3 0.998 0.998 1.036 1.097
20 18 -7.8 0.993 0.997 1.060 1.226
30 7 -13.9 0.987 0.995 1.092 1.369
40 -7 -21.7 0.980 0.992 1.132 1.557
50
Freeze Point
o
F
-28 -33.3 0.973 0.991 1.182 1.791
o
C
Capacity Power Flow PD
Table 8, Propylene Glycol Factors for Models AGZ 026B to 070B
% P.G.
10 26 -3.3 0.995 0.997 1.016 1.100
20 19 -7.2 0.987 0.995 1.032 1.211
30 9 -12.8 0.978 0.992 1.057 1.380
40 -5 -20.6 0.964 0.987 1.092 1.703
50
Freeze Point
o
F
-27 -32.8 0.952 0.983 1.140 2.251
o
C
Capacity Power Flow PD
Table 9, Ethylene Glycol Factors for Models AGZ 075B to 130B
% E.G.
10 26 -3.3 0.994 0.998 1.038 1.101
20 18 -7.8 0.982 0.995 1.063 1.224
30 7 -13.9 0.970 0.992 1.095 1.358
40 -7 -21.7 0.955 0.987 1.134 1.536
50
Freeze Point
o
F
-28 -33.3 0.939 0.983 1.184 1.755
o
C
Capacity Power Flow PD
Table 10, Propylene Glycol Factors for Models AGZ 075B to 130B
% P.G.
10 26 -3.3 0.988 0.996 1.019 1.097
20 19 -7.2 0.972 0.992 1.035 1.201
30 9 -12.8 0.951 0.987 1.059 1.351
40 -5 -20.6 0.926 0.979 1.095 1.598
50
Freeze Point
o
F
-27 -32.8 0.906 0.974 1.142 2.039
o
C
Capacity Power Flow PD
18 AGZ 026B through 130B IOMM AGZ-5
Altitude Correction Factors
Performance tables are based at sea level. Elevations other than sea level affect the performance of
the unit. The decreased air density will reduce condenser capacity consequently reducing the unit's
performance. For performance at elevations other than sea level, refer to Table 11 or Table 12.
Evaporator Temperature Drop Factors
Performance tables are based on a 10°F (5°C) temperature drop through the evaporator. Adjustment
factors for applications with temperature ranges from 6°F to 16°F (3.3°C to 8.9°C) are in Table 11 or
Table 12.
Temperature drops outside this 6°F to 16°F (3.3°C to 8.9°C) range can affect the control system's
capability to maintain acceptable control and are not recommended.
The maximum water temperature that can be circulated through the evaporator in a non-operating
mode is 100°F (37.8°C).
Fouling Factor
Performance tables are based on water with a fouling factor of
As fouling is increased, performance decreases. For performance at other than 0.0001 (0.0176)
fouling factor, refer to Table 11 or Table 12.
Foreign matter in the chilled water system will adversely affect the heat transfer capability of
the evaporator and could increase the pressure drop and reduce the water flow. Maintain
proper water treatment to provide optimum unit operation.
22
)/0176.0(/0001.0
kWCmorBTUFhrft °×°×× per ARI 550/590-98.
Table 11, Capaci t y and Power Derates, Models AGZ 026 to 070
Fouling Factor
Altitude
Sea
Level
2000 feet
4000 feet
6000 feet
Chilled Water Delta T
°F °C Cap. Power Cap. Power Cap. Power Cap. Power
6 3.3 0.978 0.993 0.975 0.991 0.963 0.987 0.940 0.980
8 4.4 0.989 0.996 0.986 0.994 0.973 0.990 0.950 0.983
10 5.6 1.000 1.000 0.996 0.999 0.984 0.994 0.961 0.987
12 6.7 1.009 1.003 1.005 1.001 0.993 0.997 0.969 0.990
14 7.7 1.018 1.004 1.014 1.003 1.002 0.999 0.978 0.991
16 8.9 1.025 1.007 1.021 1.006 1.009 1.001 0.985 0.994
6 3.3 0.977 1.001 0.973 1.000 0.961 0.996 0.938 0.989
8 4.4 0.987 1.006 0.984 1.004 0.971 1.000 0.948 0.993
10 5.6 0.998 1.009 0.995 1.007 0.982 1.003 0.959 0.996
12 6.7 1.007 1.011 1.004 1.010 0.991 1.006 0.967 0.998
14 7.7 1.014 1.014 1.011 1.013 0.998 1.009 0.974 1.001
16 8.9 1.022 1.016 1.018 1.014 1.005 1.010 0.981 1.003
6 3.3 0.973 1.011 0.970 1.010 0.957 1.006 0.935 0.998
8 4.4 0.984 1.014 0.980 1.013 0.968 1.009 0.945 1.001
10 5.6 0.995 1.019 0.991 1.017 0.979 1.013 0.955 1.005
12 6.7 1.004 1.021 1.000 1.020 0.987 1.016 0.964 1.008
14 7.7 1.011 1.024 1.007 1.023 0.994 1.018 0.971 1.011
16 8.9 1.018 1.027 1.014 1.026 1.002 1.021 0.978 1.014
6 3.3 0.969 1.021 0.966 1.020 0.954 1.016 0.931 1.008
8 4.4 0.980 1.026 0.977 1.024 0.964 1.020 0.942 1.013
10 5.6 0.989 1.029 0.986 1.027 0.973 1.023 0.950 1.015
12 6.7 0.998 1.033 0.995 1.031 0.982 1.027 0.959 1.020
14 7.7 1.007 1.036 1.004 1.034 0.991 1.030 0.967 1.022
16 8.9 1.014 1.037 1.011 1.036 0.998 1.031 0.974 1.024
0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)
IOMM AGZ-5 AGZ 026B through 130B 19
Table 12, Capacity and Power Derates, Models AGZ 075 to 130
Fouling Factor
Altitude
Sea
Level
2000 feet
4000 feet
6000 feet
8000 feet
Chilled Water
Delta T
°F °C Cap. Power Cap. Power Cap. Power Cap. Power
6 3.3 0.990 0.997 0.976 0.994 0.937 0.983 0.868 0.964
8 4.4 0.994 0.998 0.981 0.995 0.942 0.984 0.872 0.965
10 5.6 1.000 1.000 0.987 0.996 0.947 0.986 0.877 0.967
12 6.7 1.005 1.001 0.991 0.997 0.951 0.986 0.881 0.968
14 7.7 1.009 1.002 0.995 0.998 0.955 0.987 0.884 0.968
16 8.9 1.013 1.004 1.000 1.000 0.960 0.989 0.889 0.970
6 3.3 0.987 1.005 0.974 1.002 0.934 0.991 0.865 0.972
8 4.4 0.992 1.006 0.979 1.003 0.940 0.992 0.870 0.973
10 5.6 0.997 1.008 0.984 1.004 0.944 0.994 0.875 0.975
12 6.7 1.002 1.009 0.989 1.005 0.949 0.994 0.879 0.975
14 7.7 1.007 1.011 0.993 1.007 0.953 0.996 0.883 0.977
16 8.9 1.011 1.012 0.998 1.008 0.958 0.997 0.887 0.978
6 3.3 0.985 1.014 0.972 1.010 0.933 0.999 0.864 0.980
8 4.4 0.991 1.015 0.977 1.012 0.938 1.001 0.869 0.981
10 5.6 0.995 1.016 0.982 1.013 0.943 1.002 0.873 0.982
12 6.7 1.000 1.018 0.987 1.014 0.947 1.003 0.877 0.984
14 6.8 1.005 1.019 0.991 1.015 0.951 1.004 0.881 0.985
16 8.9 1.009 1.021 0.995 1.017 0.955 1.006 0.884 0.987
6 3.3 0.982 1.023 0.969 1.020 0.930 1.009 0.861 0.989
8 4.4 0.988 1.025 0.975 1.022 0.935 1.010 0.866 0.991
10 5.6 0.992 1.026 0.979 1.022 0.940 1.011 0.870 0.992
12 6.7 0.997 1.028 0.984 1.024 0.944 1.013 0.875 0.994
14 7.7 1.002 1.029 0.989 1.025 0.949 1.014 0.879 0.995
16 8.9 1.006 1.031 0.992 1.027 0.952 1.016 0.882 0.996
6 3.3 0.979 1.034 0.966 1.031 0.927 1.019 0.859 1.000
8 4.4 0.984 1.036 0.971 1.032 0.932 1.021 0.863 1.002
10 5.6 0.990 1.037 0.976 1.033 0.937 1.022 0.868 1.002
12 6.7 0.993 1.039 0.980 1.035 0.941 1.024 0.871 1.004
14 7.7 0.998 1.041 0.985 1.037 0.945 1.026 0.875 1.006
16 8.9 1.003 1.041 0.990 1.038 0.950 1.026 0.879 1.007
0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)
Evaporator Freeze Protection
Evaporator freeze-up can be a concern in the application of air-cooled water chillers.
To protect against freeze-up, insulation and an electric heater cable are furnished with
the unit. This protects the evaporator down to -20°F (-29°C) ambient air temperature.
Although the evaporator is equipped with freeze protection, it does not protect water
piping external to the unit or the evaporator itself if there is a power failure or heater
cable burnout. Consider the following recommendations for additional protection.
1. If the unit will not be operated during the winter, drain evaporator and chilled
water piping and flush with glycol. Drain and vent connections are provided on the
evaporator to ease draining.
2. Add a glycol solution to the chilled water system to provide freeze protection.
Freeze point should be approximately ten degrees below minimum design ambient
temperature.
3. The addition of thermostatically controlled heat and insulation to exposed piping.
4. Continuous circulation of water through the chilled water piping and evaporator.
20 AGZ 026B through 130B IOMM AGZ-5
The evaporator heater cable is factory wired to the 115-volt circuit in the control box.
This power should be supplied from a separate source, but it can be supplied from the
control circuit. Operation of the heater cable is automatic through the ambient sensing
thermostat that energizes the evaporator heater cable for protection against freeze-up.
Unless the evaporator is drained in the winter, the disconnect switch to the evaporator
heater must not be open.
Evaporator Flow and Pressure Drop
Evaporator flow rate must fall between the minimum and maximum values shown in
the evaporator pressure drop table on the following page.
IOMM AGZ-5 AGZ 026B through 130B 21
Figure 19, AGZ 026B – 130B, Evaporator Pressure Drop
040
045
050
055
026-030
035
065-070
075-085-090
120-130
060
100-110
AGZ Unit
Model
026B 41 1.6 2.6 4.7 65 3.9 4.1 11.6 109 10.4 6.9 30.9
030B 45 1.9 2.9 5.7 72 4.7 4.6 14.1 121 12.7 7.6 37.8
035B 50 1.9 3.1 5.6 80 4.6 5.0 13.8 133 12.4 8.4 36.9
040B 58 1.9 3.6 5.7 92 4.7 5.8 14.0 154 12.6 9.7 37.5
045B 64 1.8 4.0 5.4 102 4.5 6.4 13.4 170 12.1 10.7 35.9
050B 71 1.8 4.4 5.4 113 4.5 7.1 13.3 188 12.0 11.9 35.7
055B 78 1.8 4.9 5.3 125 4.4 7.9 13.0 209 11.7 13.2 34.8
060B 86 1.7 5.4 5.2 137 4.3 8.6 12.8 228 11.5 14.4 34.2
065B 92 1.6 5.8 4.9 147 4.1 9.3 12.1 246 10.9 15.5 32.5
070B 98 1.9 6.2 5.6 157 4.6 9.9 13.7 262 12.3 16.5 36.8
075B 111 5.6 7.0 16.5 177 12.5 11.2 37.4 295 30.4 18.6 90.7
085B 119 6.3 7.5 18.9 191 14.3 12.1 42.7 318 34.8 20.1 103.6
090B 128 7.2 8.1 21.4 205 16.2 12.9 48.4 342 39.4 21.6 117.3
100B 146 2.6 9.2 7.7 234 6.1 14.8 18.2 390 15.5 24.6 46.2
110B 161 3.1 10.2 9.2 258 7.3 16.3 21.7 430 18.5 27.1 55.1
120B 180 3.5 11.3 10.4 288 8.9 18.1 26.5 479 24.6 30.2 73.4
130B 194 4.1 12.2 12.1 311 10.4 19.6 30.9 518 28.7 32.7 85.6
NOTE: Minimum and maximum flows are established to ensure the Delta-T for each unit size falls within the 6 - 16°F range for
Inch-Pound S.I. Inch-Pound S.I. Inch-Pound S.I.
gpm DP ft. lps DP kpa gpm DP ft. lps DP kpa gpm DP ft. lps DP kpa
proper unit control.
22 AGZ 026B through 130B IOMM AGZ-5
Minimum Nominal Maximum
Wind Baffles and Hail Guards
G
A
Wind Baffles/Hail Guards are a field installed option that are used to stabilize unit operation
in high wind areas and to assist in operation at low ambient temperatures. Figure 20 is a
sketch of a typical panel assembly on an AGZ unit. The actual number of panels and parts
will vary by model size. The parts are shown in the table below and referenced by balloon
numbers.
Figure 20, Installation Sequence
Rib Att achment (First)
RIB FLANGES ON THE END
MUST POINT TO CENTER
OF COIL TO HAVE A FINISHED
LOOK. INTERIOR RIB FLANGES
CAN POINT IN ANY DIRECTION.
U
I
I
R
E
N
T
T
C
V
O
I
L
C
L
A
Front Panel Attachment (Second)
PLACE FRONT "A" AND
FASTEN TO BOTH SIDES
C
O
L
I
C
I
A
L
V
E
R
U
2
T
N
T
I
C
B
A
ATTACH ALL RIBS TO
COIL VERTICAL CHANNELS.
E
D
PLACE FRONT "B" BY LAPPIN
OVER "A" AND REPEAT
ATTACHMENT PROCEDURE.
1
3
Top Panel Attachment (Last)
E
ATTACH TOP "A" AT HORIZONTAL COIL CHANNEL FIRST.
IOMM AGZ-5 AGZ 026B through 130B 23
THIS WILL SQ UA RE THE P AN EL .
OVERLAP THE FRONT PANEL FLANGE.
C
A
R
E
I
T
T
V
I
U
N
A
D
L
I
C
O
L
B
C
ATTACH LEFT SIDE SECOND.
LAP PANEL "B" OVER PANEL "A"
ND REPEAT ATTACHMENT PR OCEDURE.
Table 13, Packing List
L
O
t
Description Part Number Bubble Number
Vertical Support Rib 074758501 1
Top Cover 330409401 2
¼ - 20 x ½” Screw (Place in Poly Bag) 046093807
Front Panel 330409501 3
Figure 21, Components
Top Panel, Install Last
Overlap the Front panel
T
REAR (AGAINST UNIT)
VERTICAL SUPPORT RIB TOP COVER FRONT PANE
P
Front Panel, Install Second
Rib, Install Firs
24 AGZ 026B through 130B IOMM AGZ-5
Optional Features
Controls
Hot Gas Bypass
Hot gas bypass permits unit operation down to 10% of full load capacity. This option
includes a factory-mounted hot gas bypass valve, solenoid valve, and manual shutoff
valve for each circuit. See page 93 for further information.
Head Pressure Control
Optional fan VFD control allows unit operation down to 0°F (-18°C). (Not available
on 380 volt, 60 Hertz units.)
Water Flow Switch
(P/N 017503300) A water flow switch is available for field installation in the chilled
water piping to avoid evaporator freeze-up under low or no flow conditions. Terminals
are provided in the unit control center for field hook-up of the water flow switch. If
this option is not ordered with the unit, then a field supplied water flow switch must be
installed.
Alarm Bell
Bell for field installation and wiring to the control panel to provide remote indication
of unit alarm condition. See Field Wiring Diagram for connection locations.
BAS Interface (Protocol Selectability
)
Connection to Chiller
Connection to the chiller for all building automation systems (BAS) protocols will be
at the unit controller. An interface card, depending on the protocol being used, may
have been factory-installed in the unit controller (or it can be field installed).
Protocols Supported
Table 14, Standard Protocol Data
Protocol Physical Layer Data Rate Controller Other
BACnet/IP or
BACnet/Ethernet
BACnet MSTP RS-485
LONWORKS
Modbus RTU RS-485 or RS-232
Ethernet 10 Base-T 10 Megabits/sec
9600, 19200 or
38400 bits/sec
FTT-10A 78kbits/sec
9600 or 19200
bits/sec
MicroTech II
MicroTech II
MicroTech II
MicroTech II
Reference ED 15062
Reference ED 15062
Reference ED 15062
Reference ED 15063
The interface kits on the MicroTech II controller are as follows:
• BACnet Kit P/N 350147404: BACnet/IP, BACnet MS/TP, or BACnet Ethernet
• LONWORKS Kit P/N 350147401: LonTalk (FTT-10A)
• Modbus: Modbus RTU
The following functions are available through the BAS where possible. Exact
capabilities may vary depending on the protocol in use.
• Enable/Disable chiller operation by setting the Unit Enable setpoint.
• Select the operating mode by setting the Unit Mode setpoint.
• Set the Cool LWT and Ice LWT setpoints.
• Set the Network Limit variable.
• Read Enable/Disable status of chiller
• Read current operating mode and status (state) of chiller.
• Read a description of each alarm when it occurs.
IOMM AGZ-5 AGZ 026B through 130B 25
Reference documents ED 15062 and ED 15063 may be obtained from the local
McQuay sales office, from the local McQuayService office, or from the McQuay
Technical Response Center, located in Staunton, Virginia (540-248-0711).
These documents can also be found on www.mcquay.com
(chiller type) > Control Integration.
The following are trademarks or registered trademarks of their respective
companies: BACnet from the American Society of Heating, Refrigerating and AirConditioning Engineers, Inc., LonTalk, LONMARK and LONWORKS from Echelon
Corporation, and Modbus and Modbus RTU from Schneider Electric.
under Product Information >
Unit
Vibration Isolators
Spring vibration isolators are available for field installation to reduce vibration
transmission through the unit base. See page 12 for detailed information on their
installation.
Protective Base Guards
Optional factory-installed, vinyl-coated welded wire base guards provide all-around
lower unit protection on ground level installations. Coil guards are standard.
Copper Fin Condenser Coils
Copper fin condenser coils are available as an option on all models.
Black Fin Coils
Aluminum fin stock precoated with a phenolic coating with 1000 hour salt spray
resistance (ASTM B117-90).
Coated Fins
Copper or aluminum fins coated with ElectroFin baked epoxy protective coating with
3000+ hour salt spray resistance (ASTM B117-90).
Evaporator Insulation
Double insulation thickness (total of 1½ inches) for high humidity areas or low fluid
temperatures.
Sound Reduction
Acoustical blankets are factory-installed on each compressor.
Hail and Wind Guards
A field-mounted option that is shipped as a kit including panels, fasteners, and
instructions. See page 23 for further information.
Shut-off Valves
Factory-mounted suction and discharge shut-off valves, liquid line shutoff valve is
standard.
Electrical
Multi-Point Electrical Connection
Provides a power connection to each of the unit’s two electrical circuits.
Disconnect Switch with Through-the-Door Handle
A factory or field-installed option for service use, nonfused disconnect switch
(mounted inside the power section of the control box) with a through-the-door handle
is available with single and multi-point power supply.
26 AGZ 026B through 130B IOMM AGZ-5
Phase Loss/Voltage Protection
Phase loss with under/over voltage protection and multiple LED indication of fault
type is available as a factory-installed option to guard against compressor motor
burnout.
Convenience Outlet
10.0 amp, 115-volt outlet located in control panel to provide power for servicing unit.
Ground Fault Protection
Protects equipment from damage from line-to-ground fault currents less than those
required for conductor protection.
High Short Circuit Current Protection
Provides control panel protection against short circuit currents per the following table:
Voltage 208 240 460 600
Current (kA) 120 100 65 25
High Ambient Control Panel
Consists of exhaust fan with rain hood, two inlet screens with filters, necessary
controls and wiring to allow operation to 125°F. The option can be factory or field
installed as a kit. Must be used for:
• Ambient temperatures above 105°F (40°C) with fan VFD (low ambient option)
• Ambient temperatures above 115°F (46°C) with standard FanTrol control.
IOMM AGZ-5 AGZ 026B through 130B 27
Physical Data
AGZ-BS
Table 15, AGZ 026BS through 035BS
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI (1), Tons (kW) 27. 2 (95. 4) 30.2 (106.3) 33.2 (117.2)
Number Of Refrigerant Circuits 2 2 2
Unit Operating Charge, R-22, Lbs. 22 22 22 27 27 27
Unit Operating Charge, R-22, (kg) 10 10 10 12 12 12
Cabinet Dimensions, LxWxH, In. 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4
Cabinet Dimensions, LxWxH, (mm) 2398 x 2235 x 2550 2398 x 2235 x 2550 2398 x 2235 x 2550
Unit Operating Weight, Lb (kg) 3990 (1811) 4040 (1834) 4080 (1852)
Unit Shipping Wei ght, Lb (kg) 39501793) 3990 (1811) 4030 (1830)
Add'l Weight If Copper Finned Coils, Lb (kg) 284 (129) 284 (129) 284 (129)
COMPRESSORS
Type Tandem Scrolls Tandem Scrolls Tandem Scrolls
Nominal tonnage of each Com pressor 7. 5 7.5 7.5 9.0 9.0 9. 0
Number Of Compressors per Circuit 2 2 2 2 2 2
Oil Charge Per Compressor, Oz. 140 140 140 140 140 140
Oil Charge Per Compressor, (g) (496) (496) (496) (496) (496) (496)
CAPACITY REDUCTION STEPS - PERCE NT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead 0-25-50-75-100 0-23-50-73-100 0-25-50-75-100
Staging, 4 Stages, Circuit #2 in Lead 0-25-50-75-100 0-27-50-77-100 0-25-50-75-100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area Sq. Ft. 26.3 26.3 26.3 26.3 26.3 26.3
Coil Face Area, (M2) 2.4 2.4 2.4 2.4 2.4 2.4
Finned Height x Finned Length, In. 50x75.6 50x75.6 50x75.6 50x75.6 50x75.6 50x75.6
Finned Height x Finned Length, (mm)
Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3
Pumpdown Capacity, 90% Full Lbs . (kg) 49 (22) 49 (22) 49 (22) 49 (22) 49 (22) 49 (22)
Maximum Relief Valve Pressure Setting,
psig (kPa)
CONDENSER FANS - DIRECT DRIVE PROPELL ER TYPE
Number Of Fans - Fan Diameter, In. (mm) 4 – 30 (762) 4 – 30 (762) 4 – 30 (762)
Number Of Motors - HP (kW) (2) 4 – 1.5 4 – 1.5 4 – 1.5
Fan And Motor RPM, 60Hz 1140 1140 1140
60 Hz Fan Tip Speed, FPM (M/Sec) 8950 (4224) 8950 (4224) 8950 (4224)
60 Hz Total Unit Airflow, CFM (M3/sec) 24,316 (11,478) 24,316 (11,478) 24,316 (11,478)
EVAPORATOR - BRAZED PLATE-TO-PLATE
Number of Evaporators 1 1 1
Number of Refrigerant Circuits 2 2 2
Water Volume, Gallons, (L) 4.3 (16.4) 5.0 (18.9) 5.7 (21.4)
Maximum Water P ressure, psig (kPa) 363 (2503) 363 (2503) 363 (2503)
Max. Refrig. Working Pressure, psig (kPa) 450 (3102) 450 (3102) 450 (3102)
Water Inlet / Outlet Victaulic Conn. In. (mm) 3 (76) 3 (76) 3 (76)
Drain - NPT int, In. (mm) Field Field Field
Vent - NPT int, In. (mm) Field Fiel d Field
NOTES:
1. Nominal capacity bas ed on 95° F ambient air and 54°F/44°F water range.
2. Except for 380V/60 & 575V /60, HP = 2.0
AGZ MODEL NUMBER
026B 030B 035B
Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
28 AGZ 026B through 130B IOMM AGZ-5
Table 16, AGZ 040BS through 055BS
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW) 38.5 (135.5) 42. 5 (149.6) 47.0 (165.4) 52.2 (183. 7)
Number Of Refrigerant Circuits 2 2 2 2
Unit Operating Charge, R-22, lbs. 31 31 38 38 38 38 46 46
Unit Operating Charge, R-22, (kg) (14) (14) (17) (17) (17) (17) (21) (21)
Cabinet Dimensions, LxWxH, in. 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lbs. (kg) 4130 (1875) 4270 (1939) 4400 (1998) 4540 (2061)
Unit Shipping Wei ght, Lbs. (kg) 4070 (1848) 4210 (1911) 4330 (1966) 4460 (2025)
Add'l Weight If Copper Finned Coils, lbs. (kg) 288 (130) 288 (130) 476 (216) 476 (216)
COMPRESSORS
Type Tandem Scrolls Tandem Scrolls Tandem Scrol l s Tandem Scrolls
Nominal tonnage of each Compressor 10.0 10.0 10.0 13.0 13.0 13.0 15.0 15.0
Number Of Compressors per Ci rcuit 2 2 2 2 2 2 2 2
Oil Charge Per Compressor, oz. 140 140 140 140 140 140 140 140
Oil Charge Per Compressor, (g) (496) (496) (496) (496) (496) (496) (496) (496)
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead 0-25-50-75-100 0-22-50-46-100 0-25-50-75-100 0-25-50-75-100
Staging, 4 Stages, Circuit #2 in Lead 0-25-50-75-100 0-28-50-85-100 0-25-50-75-100 0-25-50-75-100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, sq. ft. 44.1 44.1 44.1 44.1 44.1 44.1 44.1 44.1
Coil Face Area , sq. m 4.1 4.1 4.1 4.1 4.1 4.1 4.1 4.1
Finned Height x Finned Length, in. 42x75.6 42x75.6 42x75.6 42x75.6 42x75.6 42x75.6 42x75.6 42x75.6
Finned Height x Finned Length, (mm)
Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 2 16 x 2 16 x 3 16 x 3 16 x 3 16 x 3
Pumpdown Capacity, 90% Full Lbs . (kg) 60 (27) 60 (27) 60(27) 60(27) 82 (37) 82 (37) 82 (37) 82 (37)
Maximum Relief Valve Pressure Setting, psig (kPa)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, in. (mm) 4 – 30 (762) 4 – 30 (762) 4 – 30 (762) 4 – 30 (762)
Number Of Motors - HP (kW) (2) 4 – 1.5 4 – 1.5 4 – 1.5 4 – 1.5
Fan And Motor RPM, 60Hz 1140 1140 1140 1140
60 Hz Fan Tip Speed, FPM (m/sec) 8950 (4224) 8950 (4224) 8950 (4224) 8950 (4224)
60 Hz Total Unit Airflow, CFM (m3/sec) 39,600 (18,692) 39,600 (18,692) 39,600 (18,692) 39,600 (18, 692)
EVAPORATOR - BRAZED PLATE-TO-PLATE
Number of Evaporators 1 1 1 1
Number of Refrigerant Circuits 2 2 2 2
Water Volume, Gallons, (L) 6.3 (23.9) 7.2 (27.3) 8.1 (30.7) 9.2 (34.9)
Maximum Water P ressure, psig (kPa) 363 (2503) 363 (2503) 363 (2503) 363 (2503)
Maximum Refrigerant Working Pressure, psig (k Pa) 450 (3102) 450 (3102) 450 (3102) 450 (3102)
Water Inlet / Outlet Victaulic Connections, in. (mm) 3 (76) 3 (76) 3 (76) 3 (76)
Drain - NPT int, in. (mm ) Field Field Field Field
Vent - NPT int, in. (mm) Field Field Field Field
NOTES:
1. Nominal capacity based on 95°F ambient air and 54°F/44°F water range.
2. Except for 380V/60 & 575V/60, HP = 2.0
040B 045B 050B 055B
Ckt.1 Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.2
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1067 x
1920
450
(3103)
AGZ MODEL NUMBER
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1067 x
1920
450
(3103)
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1067 x
1920
(3103)
450
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1067 x
1920
(3103)
450
IOMM AGZ-5 AGZ 026B through 130B 29
Table 17, AGZ 060BS through 070BS
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW) 57.1 (201.0) 61.4 (215.5) 65. 5 (230. 0)
Number Of Refrigerant Circuits 2 2 2
Unit Operating Charge, R-22, lbs. 46 46 52 59 59 59
Unit Operating Charge, R-22, (kg) (21) (21) (24) (27) (27) (27)
Cabinet Dimensions, LxWxH, in. 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4 94.4 x 88.0 x 100.4
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lbs. (kg) 4600 4860 4990
Unit Shipping Wei ght, Lbs. (kg) 4520 4760 4890
Add'l Weight If Copper Finned Coils, lbs. (kg) 476 (216) 568 (258) 568 (258)
COMPRESSORS
Type Tandem Scrolls Tandem Scrolls Tandem Sc rol l s
Nominal tonnage of each Com pressor 15.0 15.0 15.0 15 / 20 15 / 20 15 / 20
Number Of Compressors per Circuit 2 2 2 2 2 2
Oil Charge Per Compressor, oz. 140 140 140 140 /148 140 /148 140 /148
Oil Charge Per Compressor, (g) (496) (496) (496) 496/ 525 496/ 525 496/ 525
CAPACITY REDUCTION STEPS - PERCE NT OF COMPRESSOR DISPL ACEMENT
Staging, 4 Stages, Circuit #1 in Lead 0-25-50-75-100 0-23-46-77-100 0-25-50-75-100
Staging, 4 Stages, Circuit #2 in Lead 0-25-50-75-100 0-31-46-69-100 0-25-50-75-100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, sq. ft. 44.1 44.1 52.6 52.6 52.6 52.6
Coil Face Area, (m2) 4.1 4.1 4.9 4.9 4.9 4.9
Finned Height x Finned Length, in. 42x75.6 42x75.6 50x75.6 50x75.6 50x75.6 50x75.6
Finned Height x Finned Length, (mm)
Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3
Pumpdown Capacity, 90% Full Lbs . (kg) 82 (37) 82 (37) 98 (44) 98 (44) 98 (44) 98 (44)
Maximum Relief Valve Pressure Setting, psig (kPa)
CONDENSER FANS - DIRECT DRIVE PROPELL E R TYPE
Number Of Fans - Fan Diameter, in. (mm) 4 – 30 (762) 4 – 30 (762) 4 – 30 (762)
Number Of Motors - HP (kW) (2) 4 – 1.5 4 – 2.0 4 – 2.0
Fan And Motor RPM, 60Hz 1140 1140 1140
60 Hz Fan Tip Speed, FPM (m/sec) 8950 (4224) 8950 (4224) 8950 (4224)
60 Hz Total Unit Airflow, CFM (m3/sec) 37,228 (17,572 43,452 (20,510) 43,452 (20,510)
EVAPORATOR - BRAZED PLATE-TO-PLATE
Number of Evaporators 1 1 1
Number of Refrigerant Circuits 2 2 2
Water Volume, Gallons, (L) 9.2 (34.9) 11.2 (42.5) 11.2 (42.5)
Maximum Water P ressure, psig (kPa) 363 (2503) 363 (2503) 363 (2503)
Maximum Refrigerant Working Pressure, psig (k Pa) 450 (3102) 450 (3102) 450 (3102)
Water Inlet / Outlet Victaulic Connections, in. (mm) 3 (76) 3 (76) 3 (76)
Drain - NPT int, in. (mm ) Field Field Field
Vent - NPT int, in. (mm) Field Field Field
NOTES:
1. Nominal capacity based on 95°F ambient air and 54° F/ 44° F water range.
2. Except for 380V/60 & 575V/60 for AGZ 060, HP = 2.0
060B 065B 070B
Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2
2398 x 2235 x
2550
1067 x
1920
450
(3103)
AGZ MODEL NUMBER
2398 x 2235 x
2550
1067 x
1920
450
(3103)
1270 x
1920
450
(3103)
1270 x
1920
450
(3103)
2398 x 2235 x
2550
1270 x
1920
450
(3103)
1270 x
1920
(3103)
450
30 AGZ 026B through 130B IOMM AGZ-5
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