McQuay AGZ 035A, AGZ 065A Operation Manual
Installation, Operation and Maintenance Manual
Air-Cooled Scroll Compressor Chiller
AGZ 035A through 065A
60 Hertz, R-22
Global Chiller Line
IOMM A G Z- 3
Group: Chiller
Part Number: 074641003
Effective: June 2002
Supercedes: IOMM A GZ -2
Table of Contents
Introduction.......................................3
General Description..................................... 3
Inspection.................................................... 3
Nomenclature .............................................. 3
Installation......................................... 4
Handling...................................................... 4
Location....................................................... 5
Service Access............................................. 5
Vibration Isolators ....................................... 7
Water Piping................................................ 8
Flow Switch................................................. 9
Water Connections..................................... 10
Glycol Solutions........................................ 10
Evaporator Flow and Pressure Drop...........11
Physical Data ...................................13
Electrical Data................................. 15
Field Wiring............................................... 15
Dimensional Data............................ 28
Startup.............................................. 29
Pre Start-up................................................ 29
Start-Up..................................................... 29
Shutdown................................................... 29
Water Piping Checkout.............................. 30
Refrigerant Piping Checkout ..................... 30
Electrical Check Out.................................. 31
Operation .........................................32
Sequence of Operation .............................. 32
Hot Gas Bypass (Optional)........................ 33
Filter Driers ............................................... 34
System A djustment.................................... 34
Liquid Sightglass and Moisture Indicator.. 34
Refrigerant Charging.................................. 34
Thermostatic Expansion Valve...................34
Crankcase Heaters......................................35
Water Cooler.............................................. 35
Global UNT Controller Installation
and Operation..................................36
General Description................................... 36
Optional Sensors........................................ 36
Controller Inputs /Outputs......................... 38
Additional Global UNT Features............... 42
Alarms........................................................44
Zone Terminal (Optional) .......................... 45
Zone Terminal Glossary.............................49
UNT Troubleshooting Ch art...................... 51
MicroTech Controller Installation
and Operation..................................52
General Description................................... 52
Optional Sensor Packages..........................52
Installation.................................................52
Sequence of Operation............................... 61
Start-Up and Shutdown.............................. 63
Keypad / Display ....................................... 64
Menu Descriptions..................................... 67
Trouble Analysis for the MicroTech ..........78
Test Procedures.......................................... 81
Unit Maintenance............................88
Preventive Maintenance Schedule............. 89
Service ..............................................90
Liquid Line Solenoid Valve....................... 90
Evaporator ................................................. 91
Refrigerant Charging.................................. 91
AGZ Troubles h ootin g Chart...................... 93
"Illustrations and data cover McQuay International products at the time of publication and we reserve the right to
2 AGZ 035A through 065A IOMM AGZ-3
Our facility is ISO Certified
"McQuay" is a registered trademark of McQuay International
make changes in design and construction at anytime without notice"
2002 McQuay International
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 aircooled condensers with integral subcooler sections, two tandem scroll compressors, 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 double
diaphragm hydraulic element thermal expansion valves. Other features include compressor crankcase
heaters, an evaporator heater for chilled water freeze protection, limited pumpdown during “on” or
“off” periods, compressor lead-lag switch 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 fused in all three phases and started by
their own three-pole contactors. Compressors are not fused but may be protected by optional circuit
breakers.
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 unit leaves the factory.
Note: Unit shipping and operating weights are available in the Physical Data tables
beginning on page 13.
Nomenclature
A G Z - XXX A S
Application
Air-Cooled
Global
Scroll Compressor
S= Standard Cooling
Design Vintage
Model Size
(Nominal Tons)
IOMM AGZ-3 AGZ 035A through 065A 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 wit h t hem.
Handling
Be careful to avoid rough handling of the unit. Do not push or pull the unit from anything other t han
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 holes are pro vided in 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
Spreader Bars
recommended
(use caution)
4 AGZ 035A through 065A IOMM AGZ-3
from this diagram. The
lifting method will remain
the same
These rigging holes
must be used.
Location
Unit Placement
AGZ units are for outdoor applications and can be mounted on a roof or ground level. Set units on a
solid and level foundation. For roof mounted applications, install the unit on a steel channel or Ibeam frame to support the unit above the roof. For ground level applications, install the unit on a
substantial base that will not settle. A one-piece concrete slab with footings extended below the frost
line is recommended. Be sure the foundation is level (within 1/2” [13 mm] over its length and width).
The foundation must support the operating weights listed in the Physical Data tables beginning on
page 13.
On ground level applications protect the unit against vandalism using the optional base guards or by
erecting a screen fence. The fence must allow free flow of air to the condenser coil for proper unit
operation. The coils are protected by standard wire mesh Coil guards.
Clearances
The flow of air to and from the condenser coil must not be limited. Restricting air flow or allowing
air recirculation will result in a decrease in unit performance and efficiency. 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 on the fan outlet.
Install the unit with enough si de clearance for air entranc e to the coil and for servicing. Provide
service access to the evaporator, compressors, electrical control panel and piping components as
shown in Figure 3.
Do not allow debris to accumulate near the unit. Air movement may draw debris into the condenser
coil causing air starvation. Give special consideration to low ambient operation where snow can
accumulate. Keep condenser coils and fan discharge free of snow or other obstructions to permit
adequate airflow.
Sound Isolation
The ultra-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 iso late 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.
Service A ccess
Each end of the unit must be accessible after installation for periodic service. Compressors, filterdriers, and manual liquid line shutoff valves are accessible. The high pressure control is located in the
control panel when using the Global UNT co ntroller, and on the compressor when using the
MicroTech controller. Low pressure, and motor protector controls are on the compressor. Most other
operational, equipment protection and starting controls are located in the unit control box.
The condenser fan and motors can be removed from the top of the unit.
IOMM AGZ-3 AGZ 035A through 065A 5
Figure 3, Clearance Requirements
6 AGZ 035A through 065A IOMM AGZ-3
Vibration Isolators
Vibration isolators are recommended for all roof mounted installations or wherever vibration
transmission is a consideration.
Table 1 and Table 2 list isolator point loads for all unit sizes. Figure 4 shows isolator locations. See
Dimensional Data for detailed dimensions required to secure each isolator to the mounting surface.
The spring flex isolators are white type CP2-32, McQuay kit number 350014821 provides the
required four per unit.
Figure 4, Isolator Locations Spring Isolator Dimensions
Table 1 , Isolator Loads At Each Mounting Location With Aluminum Fins
Unit
Size
035AS 850 386 960 435 785 356 885 401 3480 1579
040AS 864 392 974 442 797 362 900 408 3535 1603
045AS 928 421 1048 475 858 389 966 438 3800 1724
050AS 940 426 1062 482 868 394 980 445 3850 1746
055AS 990 449 1118 507 915 415 1032 468 4055 1839
060AS 1006 456 1134 514 928 421 1047 475 4115 1867
065AS 1050 476 1184 537 970 440 1091 495 4295 1948
1234Total Unit
lb Kg lb Kg lb Kg lb Kg lb Kg
Table 2, Isolator Loads At Each Mounting Location With Copper Fins
Unit
Size
035AS 960 435 1082 491 886 402 997 452 3925 1780
040AS 973 441 1096 497 899 408 1012 459 3980 1805
045AS 1038 471 1170 531 958 435 1079 489 4245 1926
050AS 1050 476 1184 537 970 440 1091 495 4295 1948
055AS 1154 523 1300 590 1066 484 1200 544 4720 2141
060AS 1166 529 1320 599 1078 489 1216 552 4780 2168
065AS 1252 568 1412 640 1156 524 1305 592 5125 2325
1234Total Unit
lb Kg lb Kg lb Kg lb Kg lb Kg
IOMM AGZ-3 AGZ 035A through 065A 7
Water Piping
Local authorities can supply the installer with the prop er building and safety codes required for safe
and proper installation.
Install piping with minimum bends and changes in elevation to minimize pressure drop. Consider the
following when installing water piping:
1. Vibration eliminators to reduce vibration and noise transmission to the building.
2. Shutoff valves to isolate the unit from the piping system during unit servicing.
3. Manual or automatic air vent valves at the high points of the system. Install drains at the lowest
points in the system.
4. A means of maintaining adequate system water pressure (expansion tank or regulati ng valve).
5. Temperature and pressure indicators located at the unit to aid in unit servicing.
6. A strainer or other means of removing foreign matter from the water before it enters the pump.
Place the strainer far enough upstream to prevent cavitation at the p ump inlet (consult p ump
manufacturer for recommendations). The use of a strainer will prolong pump life and keep
system performance up.
7. Place a strainer in the water line just before the inlet of the evapo rator. This will help prevent
foreign material from entering and decreasing the performance of the evaporator.
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.
8. The shell-and-tube evaporator has a thermostat and heating cable to prevent freeze-up down to 20°F (-29°C). It is suggested that the heating cable be wired to a separate 110V supply circui t .
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.
9. If the unit is used as a replacement chiller on a pr eviously existing piping system, flush the
system thoroughly before unit installation. Regul ar water analysis and chemica l wate r 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 “on-off” cycling.
Turnover rate should not be less than 15 minutes for normal variable cooling loads. Turnover
rate for process cooling or a constant load, should not be less than 6 minutes.
11. When glycol is added to the water system for freeze protection, the refrigerant suction pressure
will be lower, coo ling 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. Reset the freezestat and low leaving water alarm
temperatures. The freezestat is factory set as follows:
• UNT Control; Low Water Temp=38°F, Low Press=54psig
• MicroTech Control; Low Water Remp=36°F, Low Press=54psig
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.
12. Perform a preliminary leak check before insulating the piping and filling the system.
13. Piping insulation should include a vapor barrier to prevent condensation and possible damage to
the building structure.
8 AGZ 035A through 065A IOMM AGZ-3
Figure 5, Typical Field Evaporator Water Piping
Flow Switch
Mount a water flow switch in either the entering or 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 flow switch is available from McQuay (part number 017503300). It is a “paddle” type switch and
adaptable to any pipe size from 3” (76mm) to 8” (203mm) nominal. Certain minimum flow rates are
required to close the switch and are listed in Table 3. Installation should be as shown in Figure 6.
Connect the normally open contacts of the flow switch in the unit control center at terminals 5 and 6.
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.
NOTE: Differential pressure switches are not recommended for outdoor installation.
Table 3, Flow Switch Minimum Flow Rates
NOMINAL PIPE SIZE MINIMUM REQUIRED FLOW TO
INCHES (MM) ACTIVATE SWITCH - GPM (L/S)
2 (50.8) 18.80 (1.20)
2 1/2 (63.50 24.30 (1.50)
3 (76.20 30.00 (1.90)
4 (101.6) 39.70 (2.50)
5 (127.0) 58.70 (3.70)
6 (152.4) 79.20 (5.00)
Figure 6, Flow Switch Installation
Flow direction marked
on switch
1" (25mm) NPT flow
switch connection
Tee
IOMM AGZ-3 AGZ 035A through 065A 9
T
D
Note: The procedure
does not specify the
type of glycol. Use
the derate factors
found in Table 4 for
corrections when
using ethylene glycol
and those in Table 5
for propylene glycol.
Water Connections
Bring water piping to the evapor ator through the side between the vertical supports. Provide taps for
the connection of pressure gauges and thermometers in the inlet and outlet lines.
Glycol Solutions
The use of a glycol/water mixture in the CDE evaporator to prevent freezing will reduce system
capacity and efficiency and 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 5.
2. Flow – Multiply the water evaporator flow by the Flow correction factor from Table 5 determine
the increased evaporator flow due to glycol.
If the flow is unknown, it can be calculated from the following equation:
)(24
(gpm) Flow Glycol FactorCorrectionFlow
×
=
For Metric Applications – Use the following equation for metric applications:
(l/s) Flow Glycol
3.
Pressure drop -- Multiply the water pressure drop from Figure 7 by Pressure Drop correction
CapacitykW
elta
−×=18.4
factor from Table 4 or Table 5 to obtain corrected glycol pressure drop. 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 4 or Table 5.
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.
glycolCapacityTons
TDelta
−
×
×
FactorCorrectionFlow
)
CAUTION
Do not use an automotive grade antifreeze. Industri al 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 l ocal codes.
10 AGZ 035A through 065A IOMM AGZ-3
Table 4, Ethylene Glycol Correction Factors
%
E.G.
10
20
30
40
50
Freeze Point
°F °C
Capacity Power Flow Pressure Drop
26 -3 0.991 0.996 1.013 1.070
18 -8 0.982 0.992 1.040 1.129
7 -14 0.972 0.986 1.074 1.181
-7 -22 0.961 0.976 1.121 1.263
-28 -33 0.946 0.966 1.178 1.308
Table 5, Propylene Glycol Correction Factors
%
P.G.
10
20
30
40
50
Freeze Point
°F °C
Capacity Power Flow Pressure Drop
26 -3 0.987 0.992 1.010 1.068
19 -7 0.975 0.985 1.028 1.147
9 -13 0.962 0.978 1.050 1.248
-5 -21 0.946 0.971 1.078 1.366
-27 -33 0.929 0.965 1.116 1.481
Table 6, Capacity and Power Derates
Chilled Water
ALTITUDE
SEA
LEVEL
2000 feet
(610 m)
4000 feet
(1220 m)
6000 feet
(1830 m)
Delta-T
°F °C Cap. Power Cap. Power Cap. Power Cap. Power
6 3.3 0.992 0.995 0.985 0.993 0.962 0.986 0.919 0.972
8 4.4 0.995 0.997 0.988 0.995 0.965 0.988 0.922 0.974
10 5.6 1.000 1.000 0.993 0.998 0.970 0.991 0.927 0.977
12 6.7 1.005 1.002 0.998 1.000 0.975 0.993 0.932 0.979
14 6.8 1.010 1.005 1.003 1.003 0.980 0.996 0.936 0.982
16 8.9 1.014 1.007 1.007 1.005 0.984 0.998 0.940 0.984
6 3.3 0.978 1.005 0.971 1.003 0.949 0.996 0.906 0.982
8 4.4 0.982 1.007 0.975 1.005 0.953 0.998 0.910 0.984
10 5.6 0.986 1.009 0.979 1.007 0.956 1.000 0.914 0.986
12 6.7 0.992 1.011 0.985 1.009 0.962 1.002 0.919 0.988
14 6.8 0.997 1.014 0.990 1.012 0.967 1.005 0.924 0.991
16 8.9 1.000 1.016 0.993 1.014 0.970 1.007 0.927 0.993
6 3.3 0.966 1.016 0.959 1.014 0.937 1.007 0.895 0.993
8 4.4 0.969 1.018 0.962 1.016 0.940 1.009 0.898 0.995
10 5.6 0.973 1.021 0.966 1.019 0.944 1.012 0.902 0.998
12 6.7 0.978 1.025 0.971 1.023 0.949 1.016 0.906 1.002
14 6.8 0.982 1.027 0.975 1.025 0.953 1.018 0.910 1.004
16 8.9 0.986 1.028 0.979 1.026 0.956 1.019 0.914 1.005
6 3.3 0.953 1.025 0.946 1.023 0.924 1.016 0.883 1.002
8 4.4 0.955 1.028 0.948 1.026 0.926 1.019 0.885 1.005
10 5.6 0.959 1.031 0.952 1.029 0.930 1.022 0.889 1.008
12 6.7 0.963 1.034 0.956 1.032 0.934 1.024 0.893 1.011
14 6.8 0.968 1.036 0.961 1.034 0.939 1.026 0.897 1.013
16 8.9 0.972 1.037 0.965 1.035 0.943 1.027 0.901 1.014
0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)
Fouling Factor
Evaporator Flow and Pressure Drop
Evaporator flow rate must fall between the minimum and maximum values shown in the evaporator
pressure drop table on Figure 7.
Measure the chilled water pressure drop through the evaporator at factory installed pressure taps. It is
important not to include the effect of valves or strainers in these readings.
Varying chilled water flow through the evapo rator while the compressor(s) are operating is not
recommended.
IOMM AGZ-3 AGZ 035A through 065A 11
Figure 7, Pressure Drop Curve
A
03 A-040A
5
5
04A-060A
06
5
AGZ
Unit
Size
035AS 9.2 82 5.17 23.1 137 8.62 3.9 51 3.23
040AS 11.5 93 5.87 28.8 155 9.78 4.9 58 3.67
045AS 11.2 106 6.69 28.2 177 11.15 4.8 66 4.18
050AS 13.4 117 7.38 33.6 195 12.30 5.7 73 4.61
055AS 16.2 129 8.14 40.0 215 13.56 7.0 81 5.09
060AS 18.0 138 8.71 45.0 230 14.51 7.7 86 5.44
065AS 10.0 146 9.21 25.1 243 15.35 4.3 91 5.76
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.
Pressure Drop Flow Pressure Drop Flow Pressure Drop Flow
(ft) of Water (gpm) (lps) (ft) of Water (gpm) (lps) (ft) of Water (gpm) (lps)
NOMINAL MAXIMUM MINIMUM
12 AGZ 035A through 065A IOMM AGZ-3
Physical Data
Table 7, AGZ 035AS through 045AS
STANDARD EFFICIENCY 035AS 040AS 045AS
BASIC DATA Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2
Unit Capacity @ ARI Conditions (1), Tons (kW) 34.3 (120.5) 38.9 (136.7) 44.3 (156.0)
Number Of Refrigerant Circuits 2 2 2
Unit Operating Charge, R-22, lb. 36 36 40 40 42 42
Unit Operating Charge, R-22, (kg) (16.3) (16.3) (18.1) (18.1) (19.0) (19.0)
Cabinet Dimensions, LxWxH, In. 94.0 x 88.2 x 86.2 94.0 x 88.2 x 86.2 94.0 x 88.2 x 86.2
Cabinet Dimensions, LxWxH, (mm) 2388 x 2241 x 2190 2388 x 2241 x 2190 2388 x 2241 x 2190
Unit Operating Weight, lb (kg) 3480 (1580) 3535 (1605) 3800 (1725)
Unit Shipping Weight, lb (kg) 3405 (1545) 3460 (1570) 3695 (1675)
Add'l Weight If Copper Finned Coils, lb (kg) 445 (200) 445 (200) 445 (200)
COMPRESSORS
Nominal tonnage of each Compressor 9.0 9.0 10.0 10.0 10.0 13.0
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 - PERCENT OF COMPRESSOR DISPLACEMENT
Standard Staging - Circuit #1 in Lead
Standard Staging - Circuit #2 in Lead
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, sq. ft. 46.4 46.4 46.4 46.4 46.4 46.4
Finned Height x Finned Length, In. 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5
Finned Height x Finned Length, (mm) (2032 x
Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2 16 x 2
Maximum Relief Valve Pressure Setting, psig (kPa) 450
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, In. (mm) 4 - 28 (712) 4 - 28 (712) 4 - 28 (712)
Number Of Motors - HP (kW) (2) 4 - 1.0 (0.7) 4 - 1.0 (0.7) 4 - 1.5 (1.1)
Fan And Motor rpm, 60Hz 1140 1140 1140
60 Hz Fan Tip Speed, fpm (m/Sec) 8357 (35.4) 8357 (35.4) 8357 (35.4)
60 Hz Total Unit Airflow, cfm (m3/sec) 34400 (16.2) 34400 (16.2) 38000 (17.9)
DIRECT EXPANSION EVAPORATOR - BAFFLED SHELL AND THRU-TUBE
Diameter, in. - Length, ft. 10 - 04 10 - 04 12 - 04
Diameter, (mm) - Length, (mm) (254) - (1220) (254) - (1220) (305) - (1220)
Water Volume, Gallons, (l) 9.1 (34.5) 9.1 (34.5) 12.8 (48.5)
Maximum Water Pressure, psig (kPa) 175 (1207) 175 (1207) 175 (1207)
Maximum Refrigerant Working Pressure, psig (kPa) 225 (1552) 225 (1552) 225 (1552)
Water Inlet / Outlet Victaulic Connections, In. (mm) 4 (101.6) 4 (101.6) 4 (101.6)
Drain - NPT int, In. (mm) .375 (9.5) .375 (9.5) .375 (9.5)
Vent - NPT int, In. (mm) .375 (9.5) .375 (9.5) .375 (9.5)
NOTES:
1. Nominal capacity based on 95°F ambient air and 54°F/44°F water range.
2. Units with 1.0 Hp Fan Motors, Uses 1.5 Hp Fan Motors when unit is 380V / 60 Hz and 575V / 60Hz.
PHYSICAL DATA AGZ MODEL NUMBER
Type Tandem Scrolls Tandem Scrolls Tandem Scrolls
Standard 4 Stages 0-25-50-75-100 0-25-50-75-100 0-22-50-72-100
Standard 4 Stages 0-25-50-75-100 0-25-50-75-100 0-28-50-78-100
Coil Face Area, (m2) (4.3) (4.3) (4.3) (4.3) (4.3) (4.3)
2121)
(3103)
(2032 x
2121)
(3103)
450
(2032 x
2121)
450
(3103)
(2032 x
2121)
450
(3103)
(2032 x
2121)
450
(3103)
(2032 x
2121)
450
(3103)
IOMM AGZ-3 AGZ 035A through 065A 13
Table 8, AGZ 050AS through 065AS
PHYSICAL DATA AGZ MODEL NUMBER
BASIC DATA Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2 Ckt.1 Ckt.2
Unit Capacity @ ARI Conditions (1), Tons (kW) 48.9 (172.2) 54.1 (190.1) 58.9 (207.4) 61.6 (216.5)
COMPRESSORS
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Maximum Relief Valve Pressure Setting, psig (kPa) 450
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
DIRECT EXPANSION EVAPORATOR – BAFFLED SHELL AND THRU-TUBE
Maximum Refrigerant Working Pressure, psig (kPa) 225 (1552) 225 (1552) 225 (1552) 225 (1552)
Water Inlet / Outlet Victaulic Connections, In. (mm) 4 (101.6) 4 (101.6) 4 (101.6) 5 (127.0)
NOTE: Nominal capacity based on 95°F ambient air and 54°F/44°F water range.
STANDARD EFFICIENCY 050AS 055AS 060AS 065AS
Number of Refrigerant Circuits 2 2 2 2
Unit Operating Charge, R-22, Lb. 44 44 54 54 56 56 62 62
Unit Operating Charge, R-22, (kg) (18.1) (18.1) (22.6) (22.6) (23.5) (23.5) (28.1) (28.1)
Cabinet Dimensions, LxWxH, In. 94.0 x 88.2 x 86.2 94.0 x 88.2 x 86.2 94.0 x 88.2 x 86.2 94.0 x 88.2 x 96.2
Cabinet Dimensions, LxWxH, (mm) 2388 x 2241 x 2190 2388 x 2241 x 2190 2388 x 2241 x 2190 2388 x 2241 x 2444
Unit Operating Weight, lb. (kg) 3850 (1745) 4055 (1840) 4115 (1865) 4295 (1950)
Unit Shipping Weight, lb. (kg) 3745 (1700) 3950 (1790) 4010 (1820) 4190 (1900)
Add'l Weight If Copper Finned Coils, lb. (kg) 445 (200) 665 (300) 665 (300) 830 (375)
Nominal Horsepower of each Compressor 13.0 13.0 13.0 15.0 15.0 15.0 15.0 15.0
Number of Compressors per Circuit 2 2 2 2 2 2 2 2
Oil Charge Per Compressor, o. 140 140 140 140 140 140 140 140
Oil Charge Per Compressor, (g) (496) (496) (496) (496) (496) (496) (496) (496)
Standard Staging - Circuit #1 in Lead
Standard Staging - Circuit #2 in Lead
Finned Height x Finned Length, In. 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5 80 x 83.5 100x 83.5 100x 83.5
Finned Height x Finned Length, (mm) (2032 x
Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3
Number of Fans - Fan Diameter, In. (mm) 4 - 28 (712) 4 - 28 (712) 4 - 28 (712) 4 - 28(712)
Number of Motors - HP (kW) 4 - 1.5 (1.1) 4 - 1.5 (1.1) 4 - 1.5 (1.1) 4 - 1.5 (1.1)
Fan And Motor rpm, 60Hz 1140 1140 1140 1140
60 Hz Fan Tip Speed, fpm (m/Sec) 8357 (35.4) 8357 (35.4) 8357 (35.4) 8357 (35.4)
60 Hz Total Unit Airflow, cfm (m3/sec) 38000 (17.9) 36800 (17.4) 36800 (17.4) 38400 (18.1)
Diameter, in. - Length, ft. 12 - 04 12 - 04 12 - 04 12 - 04
Diameter, (mm) - Length, (mm) (305) - (1220) (305) - (1220) (305) - (1220) (305) - (1220)
Water Volume, gallons, (l) 12.8 (48.5) 12.8 (48.5) 2.8 (48.5) 12.8 (48.5)
Maximum Water Pressure, psig (kPa) 175 (1207) 175 (1207) 175 (1207) 175 (1207)
Drain - NPT int, In. (mm) .375 (9.5) .375 (9.5) .375 (9.5) .375 (9.5)
Type Tandem Scrolls Tandem Scrolls Tandem Scrolls Tandem Scrolls
Standard 4 Stages 0-25-50-75-100 0-23-50-73-100 0-25-50-75-100 0-25-50-75-100
Standard 4 Stages 0-25-50-75-100 0-27-50-77-100 0-25-50-75-100 0-25-50-75-100
Coil Face Area, sq ft 46.4 46.4 46.4 46.4 46.4 46.4 58.0 58.0
Coil Face Area, (m2) (4.3) (4.3) (4.3) (4.3) (4.3) (4.3) (5.4) (5.4)
2121)
(3103)
Vent - NPT int, In. (mm) .375 (9.5) .375 (9.5) .375 (9.5) .375 (9.5)
(2032 x
2121)
450
(3103)
(2032 x
2121)
450
(3103)
(2032 x
2121)
450
(3103)
(2032 x
2121)
450
(3103)
(2032 x
2121)
450
(3103)
(2540 x
2121)
450
(3103)
(2540 x
2121)
(3103)
450
14 AGZ 035A through 065A IOMM AGZ-3
Electrical Data
Field Wiring
Internal power wiring to the compressors for single and multiple poi nt option
are different. Field wiring must be installed according to unit wi ri ng di agram
Wiring must comply with all applicable codes and ordinances. Warranty is void if wiring is not in
accordance with specifications. Copper wire is required for all power lead terminations at the unit.
Aluminum or copper can be used for all other wiring.
AGZ units have internal power wiring for single point power connection. A single large power
terminal block is provided and wiring within the unit is sized in accordance with the National
Electrical Code. A single field supplied fused disconnect is required. An optional factory mounted
transformer may be installed. If the evaporator heater is on a separate disconnect switch from the
main unit power supply, the unit may be shut down without defeating the freeze protection provided
by the cooler heater.
Table 9, AGZ 035A - 065A, 60 Hz, Single Point Power Electrical Data
AGZ
Unit
Size
035A
040A
045A
050A
055A
060A
065A
CAUTION
or serious electrical damage can occur.
Minimum
Volts
208 146 3 1/0 1 1.50 (38) 175
230 146 3 1/0 1 1.50 (38) 175
380 93 3 3 1 1.25 (32) 110
460 76 3 4 1 1.00 (25) 90
575 58 3 6 1 1.00 (25) 70
208 166 3 2/0 1 1.50 (38) 200
230 166 3 2/0 1 1.50 (38) 200
380 111 3 2 1 1.25 (32) 125
460 78 3 4 1 1.00 (25) 90
575 67 3 4 1 1.00 (25) 80
208 187 3 3/0 1 2.00 (51) 225
230 187 3 3/0 1 2.00 (51) 225
380 122 3 1 1 1.25 (32) 150
460 94 3 3 1 1.25 (32) 110
575 76 3 4 1 1.00 (25) 90
208 200 3 3/0 1 2.00 (51) 225
230 200 3 3/0 1 2.00 (51) 225
380 133 3 1 1 1.25 (32) 150
460 104 3 2 1 1.25 (32) 125
575 83 3 4 1 1.00 (25) 100
208 225 3 4/0 1 2.00 (51) 250
230 225 3 4/0 1 2.00 (51) 250
380 143 3 1/0 1 1.50 (38) 175
460 109 3 2 1 1.25 (32) 125
575 94 3 3 1 1.25 (32) 110
208 248 3 4/0 1 2.50 (64) 300
230 248 3 4/0 1 2.50 (64) 300
380 153 3 2/0 1 1.50 (38) 175
460 112 3 2 1 1.25 (32) 125
575 103 3 3 1 1.25 (32) 125
208 248 3 4/0 1 2.50 (64) 300
230 248 3 4/0 1 2.50 (64) 300
380 153 3 2/0 1 1.50 (38) 175
460 112 3 2 1 1.25 (32) 125
575 103 3 3 1 1.25 (32) 125
Circuit
Ampacity
(MCA)
Field Wire Hub
Quantity
POWER SUPPLY
Wire
Gauge
Quantity
Nominal
Size
Max. Fuse
HACR
Breaker
or
Size
IOMM AGZ-3 AGZ 035A through 065A 15
Table 10, AGZ 035A - 065A, 60 Hz, Compressor and Condenser Fan Motor Amp Draw
Rated Load Amps Locked Rotor Amps
AGZ
Unit
Size
035A
040A
045A
050A
055A
060A
065A
Volts
208 30.5 30.5 4.0 4 17.0 232 232
230 30.5 30.5 4.0 4 17.0 232 232
380 18.6 18.6 3.4 4 14.4 144 144
460 15.8 15.8 2.0 4 8.5 125 125
575 11.6 11.6 2.2 4 10.3 100 100
208 35.2 35.2 4.0 4 17.0 278 278
230 35.2 35.2 4.0 4 17.0 278 278
380 22.8 22.8 3.4 4 14.4 151 151
460 16.5 16.5 2.0 4 8.5 127 127
575 13.7 13.7 2.2 4 10.3 100 100
208 35.2 41.5 5.8 4 23.7 278 350
230 35.2 41.5 5.8 4 23.7 278 350
380 22.8 28.0 3.4 4 14.4 151 195
460 16.5 21.8 2.8 4 10.7 127 158
575 13.7 17.3 2.3 4 11.5 100 125
208 41.5 41.5 5.8 4 23.7 350 350
230 41.5 41.5 5.8 4 23.7 350 350
380 28.0 28.0 3.4 4 14.4 195 195
460 21.8 21.8 2.8 4 10.7 158 158
575 17.3 17.3 2.3 4 11.5 125 125
208 41.5 52.8 5.8 4 23.7 350 425
230 41.5 52.8 5.8 4 23.7 350 425
380 28.0 32.7 3.4 4 14.4 195 239
460 21.8 23.7 2.8 4 10.7 158 187
575 17.3 22.1 2.3 4 11.5 125 148
208 52.8 52.8 5.8 4 23.7 425 425
230 52.8 52.8 5.8 4 23.7 425 425
380 32.7 32.7 3.4 4 14.4 239 239
460 23.7 23.7 2.8 4 10.7 187 187
575 22.1 22.1 2.3 4 11.5 148 148
208 52.8 52.8 5.8 4 23.7 425 425
230 52.8 52.8 5.8 4 23.7 425 425
380 32.7 32.7 3.4 4 14.4 239 239
460 23.7 23.7 2.8 4 10.7 187 187
575 22.1 22.1 2.3 4 11.5 148 148
Compressors Compressors
No.
1 & 3
(Each)
No.
2 & 4
(Each)
Fan
Motors
(Each)
No. Of
Fan
Motors
Fan
Motors
(Each)
Across-The-Line
No.1 & 3
(Each)
No.2 & 4
(Each)
Table 11, AGZ035A - 065A, 60 Hz Single Point Power, Field Wiring Data
AGZ
Unit
Size
035A
040A
045A
Table continued on next page
Volts
208 335 # 4 - 400 MCM 225 #4 – 4/0
230 335 # 4 - 400 MCM 225 #4 – 4/0
380 175 #12 - 2/0 100 #14 - 1/0
460 175 #12 - 2/0 100 #14 - 1/0
575 175 #12 - 2/0 100 #14 - 1/0
208 335 # 4 - 400 MCM 225 #4 – 4/0
230 335 # 4 - 400 MCM 225 #4 – 4/0
380 175 #12 - 2/0 150 #4 – 4/0
460 175 #12 - 2/0 100 #14 - 1/0
575 175 #12 - 2/0 100 #14 - 1/0
208 335 # 4 - 400 MCM 225 #4 – 4/0
230 335 # 4 - 400 MCM 225 #4 – 4/0
380 175 #12 - 2/0 150 #4 – 4/0
460 175 #12 - 2/0 100 #14 - 1/0
575 175 #12 - 2/0 100 #14 - 1/0
Wiring to Standard
Terminal
Amps
Power Block
Connector Wire Range
(Copper Wire Only)
Wiring to Optional
Non-Fused Disconnect Switch
Terminal
Amps
Connector Wire Range
(Copper Wire Only)
16 AGZ 035A through 065A IOMM AGZ-3
Table 11, AGZ035A - 065A, 60 Hz Single Point Power, Field Wiring Data (continued)
AGZ
Unit
Size
050E
055A
060A
065A
Wiring to Standard
Volts
208 335 # 4 - 400 MCM 225 #4 – 4/0
230 335 # 4 - 400 MCM 225 #4 – 4/0
380 335 # 4 - 400 MCM 150 #4 – 4/0
460 175 #12 - 2/0 150 #4 - 4/0
575 175 #12 - 2/0 150 #4 - 4/0
208 335 # 4 - 400 MCM 400 250 - 500 MCM
230 335 # 4 - 400 MCM 400 250 - 500 MCM
380 335 # 4 - 400 MCM 250 #4 - 350 MCM
460 175 #12 - 2/0 150 #4 - 4/0
575 175 #12 - 2/0 150 #4 - 4/0
208 335 # 4 - 400 MCM 400 250 - 500 MCM
230 335 # 4 - 400 MCM 400 250 - 500 MCM
380 335 # 4 - 400 MCM 250 #4 - 350 MCM
460 175 #12 - 2/0 150 #4 - 4/0
575 175 #12 - 2/0 150 #4 - 4/0
208 335 # 4 - 400 MCM 400 250 - 500 MCM
230 335 # 4 - 400 MCM 400 250 - 500 MCM
380 335 # 4 - 400 MCM 250 #4 - 350 MCM
460 175 #12 - 2/0 150 #4 - 4/0
575 175 #12 - 2/0 150 #4 - 4/0
Terminal
Amps
Power Block
Connector Wire Range
(Copper Wire Only)
Terminal
Wiring to Optional
Non-Fused Disconnect Switch
Amps
Connector Wire Range
(Copper Wire Only)
Notes for “Electrical Data Single Point ” Power:
1. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLA plus 100% of RLA
of all other loads in the circuit including the control transformer.
2. If the control transformer option is furnished, no separate 115V power is required.
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 Sizes” are 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. Ampacity
correction factors must be applied for other ambient temperatures. Refer to the National Electrical Code
Handbook.
8. The MCA may vary slightly depending on fan motor options such as SpeedTrol, TEFC.
Power Limitations:
Volts within ± 10 percent of nameplate rating. Phase unbalance maximum of 3 percent.
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. If unit is equipped with SpeedTrol condenser fan motors, the first motor on each
refrigerant circuit is a single phase, 1hp motor, with a FLA of 2.8 amps at 460 volts, 5.6 amps at 208, 230,
380, and 575 volts.
2. Compressor LRA for reduced inrush start are for the first winding only. If the unit is equipped with
SpeedTrol motors, the first motor is a single phase, 1 hp motor, with a LRA of 7.3 amps at 460 volts, 14.5
amps at 208, 230, 380, and 575 volts.
Notes for “Field Wiring Data”
1. Requires a single disconnect to supply electrical power to the unit. This power must be fused.
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 table apply to 75°C rated wire per NEC.
IOMM AGZ-3 AGZ 035A through 065A 17
Electrical Legend
Figure 8, Electrical Legend
18 AGZ 035A through 065A IOMM AGZ-3
Figure 9, Typical Field Wiring with Global UNT Controller
IOMM AGZ-3 AGZ 035A through 065A 19
Figure 10, Typical Field Wiring Diagram with MicroTe ch Controller
20 AGZ 035A through 065A IOMM AGZ-3
Figure 11, Single-point Connection with FanTrol
IOMM AGZ-3 AGZ 035A through 065A 21
Figure 12, Single-point Connection with SpeedTrol
22 AGZ 035A through 065A IOMM AGZ-3
Figure 13, Unit Control Schematic (UNT)
IOMM AGZ-3 AGZ 035A through 065A 23
Figure 14, Staging Schematic (UNT)
24 AGZ 035A through 065A IOMM AGZ-3
Figure 15, MicroTech Controller Schematic
IOMM AGZ-3 AGZ 035A through 065A 25
Figure 16, Unit Control Schematic (MicroTech)
26 AGZ 035A through 065A IOMM AGZ-3
Figure 17, Staging Schematic (MicroTech)
IOMM AGZ-3 AGZ 035A through 065A 27
Dimensional Data
Figure 18, Dimensions AGZ 035A - 065A
81.7
(2075)
81.7
(2075)
81.7
(2075)
81.7
(2075)
81.7
(2075)
81.7
(2075)
91.7
(2329)
Dimensions
inches (mm)
61.6
(1565)
61.6
(1565)
61.6
(1565)
61.6
(1565)
61.6
(1565)
61.6
(1565)
61.6
(1565)
AGZ
Model
Number
035AS
040AS
045AS
050AS
055AS
060AS
065AS
A B C D E F X Y Z Operating Shipping
86.2
(2190)
86.2
(2190)
86.2
(2190)
86.2
(2190)
86.2
(2190)
86.2
(2190)
96.2
(2444)
28 AGZ 035A through 065A IOMM AGZ-3
22.3
(566)
22.3
(566)
22.3
(566)
22.3
(566)
22.3
(566)
22.3
(566)
22.3
(566)
5.3
(134)
5.3
(134)
4.3
(108)
4.3
(108)
4.3
(108)
4.3
(108)
4.3
(108)
15.0
(381)
15.0
(381)
16.0
(406)
16.0
(406)
16.0
(406)
16.0
(406)
16.0
(406)
Center Of Gravity
inches (mm)
43.9
(1115)
43.9
(1115)
44.2
(1123)
44.2
(1123)
44.6
(1133)
44.6
(1133)
45.0
(1143)
40.2
(1021)
40.2
(1021)
40.8
(1036)
40.8
(1036)
41.2
(1046)
41.2
(1046)
41.8
(1062)
36.2
(920)
36.2
(920)
35.6
(904)
35.6
(904)
36.4
(925)
36.4
(925)
38.8
(966)
Unit Weights
lb (kg)
3480
(1580)
3535
(1605)
3800
(1725)
3850
(1745)
4055
(1840)
4115
(1865)
4295
(1950)
3405
(1545)
3460
(1570)
3695
(1675)
3745
(1700)
3950
(1790)
4010
(1820)
4190
(1900)
Additional Weight
For Copper
Fin Coils lb (kg)
445
(200)
445
(200)
445
(200)
445
(200)
665
(300)
665
(300)
830
(375)
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 Global UNT Controller section 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 required temperature. (The system water temperature must be
greater than the total of the leaving water temperature setpoint plus 1/2 the control band before
the Global UNT controller will stage on cooling.)
4.
Set the control band to 4°F as a starting point.
5.
Put both circuit switches to the AUTO position.
6.
Put switch S1 to AUTO position.
7.
There will be a delay of 2 minutes after closing S1. The time delay is due to the compressor
inherent motor protection. This may allow more than one compressor to start after this time
period. This should only occur on initial start-up or when power to the chiller has been turned off
and back on. The panel Alarm Light will turn off.
8.
After the chiller has been operating for a period of time and has become stable, check the
following:
Compressor oil level. (Some Scroll compressors do not have oil sight glasses)
Refrigerant sight glass for flashing.
Rotation of condenser fans.
9.
Complete the “Compressorized Equipment Warranty Form”.
Shutdown
Temporary
1. Put both circuit switches to Pumpdown and Stop.
2.
After compressors have stopped, put System Switch (S1) to 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.
IOMM AGZ-3 AGZ 035A through 065A 29
Loading...