McQuay AGZ 010A Installation Manual
Installation, Operation and Maintenance Manual
IOMM AGZ1
Air-Cooled Scroll Compressor Water Chillers
AGZ 010A – AGZ 034A
10 to 34 Tons, 35 to 120 kW
R-22, 60 Hertz
Group:
Part Number
Effective:
Supersedes:
Chiller
October 2001
: 330262001
New
Table of Contents
N
Introduction........................................3
General Description......................................... 3
Inspection ........................................................ 3
Installation....................................................... 3
Handling.......................................................... 3
Location........................................................... 4
Service Access................................................. 4
Vibration Isolators........................................... 6
Chilled Water System...................................... 6
Water Connections........................................... 9
Refrigerant Charge........................................... 9
Unit Component Location............................... 9
Glycol Solutions.............................................. 9
Evaporator Water Flow and Pressure Drop..... 9
Control Layout and Operation.......11
Control Center................................................11
Start-up and Shutdown...................11
Pre Start-up.....................................................11
Start-up...........................................................11
Sequence of Operation................................... 12
Physical Data....................................13
Electrical Data................................. 15
Field Wiring................................................... 15
Dimensional Data............................ 20
System Maintenance....................... 21
General...........................................................21
Lubrication.....................................................21
Electrical Terminals.......................................21
Condensers.....................................................21
Refrigerant Sightglass.................................... 21
Standard MicroTech II Controller 22
Table of Contents........................................... 22
Overview........................................................23
General Description....................................... 23
Using the Controller.......................................30
Service.............................................. 42
Thermostatic Expansion Valve.......................42
Filter-Driers...................................................42
Liquid Line Solenoid..................................... 42
Optional Controls...........................................43
Troubleshooting Chart ...................................45
MODEL CODE
A G
Air-Cooled
Global Series
Scroll Compressor
"McQuay" is a registered trademark of McQuay International
"Illustrations and data cover the McQuay International products at the time of publication and we reserve the right to make changes in design and
2
construction at anytime without notice"
AGZ 010A through 034A IOMM AGZ1
Z XXX A S
2001 McQuay International
S=Packaged Evaporator
M=Remote Evaporator
Vintage
ominal To ns
Introduction
General Description
McQuay air-cooled water chillers are complete, self-contained automatic refrigerating units. Every
unit is completely assembled, factory wired, charged, and tested. Each unit consists of air-cooled
condensers, Copeland Compliant Scroll hermetic compressor, brazed plate-to-plate evaporator, and
complete refrigerant piping. Liquid line components include sight-glass/moisture indicator, solenoid
valve, and thermal expansion valve. Other features include a compressor heater, and evaporator
heater for chilled water freeze protection.
The electrical control center includes all equipment protection and operating controls necessary for
automatic operation. Condenser fan motors are three-phase (except single-phase on No. 1 fan with
SpeedTrol option) and started by their own contactors and have inherent overload protection. The
compressor has solid-state motor protection for inherent thermal overload protection except Model
AGZ 010 that has internal line breakage.
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 to be
sure it agrees with the power supply available. Units are shipped FOB factory and McQuay is not
responsible for physical damage after unit leaves the factory.
Note:
Unit shipping and operating weights are listed on pages 13 and 14.
Installation
Note:
Installation is to be perform ed by qualified personnel who are familiar with local codes
and regulations, especially concerning refrigerant release to the atmosphere.
WARNING
Sharp edges and coil surfaces are a potential hazard. Avoid contact with them.
Handling
Be careful to avo id r ough hand ling o f the unit. Do not push or p ull t he uni t fr om anything othe r 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, lifting slots are provided in the base of the unit. Arrange spreader bars and cables to
prevent damage to the condenser coils or cabinet (see Figure 2).
IOMM AGZ1 AGZ 010A through 034A
3
Figure 1, Suggested Pushing Arrange ment
Blocking required
across full width
Figure 2, Suggested Lifting Arrangement
Location
Unit Placement
AGZ units are for outdoor applications and can be mounted on a roof or at 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 on pages 13 and
14.
Since its operation is affected by wind, the unit should be located so that its length is parallel with the
prevailing wind. If this is not practical, use field fabricated wind deflectors.
Service Access
Each end of the unit must be accessible after installation for periodic service. Compressors, filterdriers, and liquid line solenoid valve are accessible from the end of the unit. High-pressure, lowpressure, and motor protector controls are on the compressor. Most operational, safety and starting
controls are located in the unit control box.
The fan deck with the condenser fans and motors can be removed from the top of the unit.
4
AGZ 010A through 034A IOMM AGZ1
Clearances
The flow of air to and from the condenser
coil must not be limited. Restricting
airflow 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 entrance 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 block access to the unit
with piping or conduit.
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.
Figure 3, Clearance requirements
4 Ft. (1220mm)
Clearance for Air Inlet
4 Ft.
(1220mm)
Clearance for
Service Access
4 Ft. (1220mm)
Clearance for Air Inlet
The recommended minimum side clearance between two units
is 8 feet (2440mm).
4 Ft.
(1220mm)
Clearance for
Service Access
Sound Isolation
The low sound levels of the AGZ chiller are
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 through electrical conduit. Spring
isolators are effective in reducing the low
amplitude sound generated by the Discus
semi-hermetic compressors and for unit
isolation in sound-sensitive areas.
The unit must not be installed in a pit or enclosure that is
deeper or taller than the height of the unit unless extra space
is provided. The minimum clearance on each side of the
unit is 6 feet (1828mm) when installed in a pit. The pit cannot
be deeper than the unit.
The minimum clearance to a side wall or building taller than
the unit height is 6 feet (1828mm) provided no solid wall
above 6 feet (1828mm) tall is closer than 12 feet (3658mm)
to the opposite side of the unit.
IOMM AGZ1 AGZ 010A through 034A
5
Vibration Isolators
Vibration isolators are recommended for all roof-mounted installations or wherever vibration
transmission is a consideration. The isolators can be purchased from McQuay by the part numbers
shown in the table.
The unit should be initially on shims or blocks at the listed free height. When all piping, wiring,
flushing, charging, etc. is completed, the springs are adjusted upward to loosen the blocks or shims
that are then removed.
A rubber anti-skid pad is part of the isolator. Installation of spring isolators requires flexible piping
connections and at least three feet of flexible conduit to avoid straining the piping and transmitting
vibration and noise.
Table 1, Recommended Vibration Isolators
AGZ UNIT
010A – 034A Rubber-in-shear
010A – 017A Spring Isolators 047792726 4 350014835 All CP-1-26
020A – 034A Spring Isolators
Note: See dimension drawing for location of isolators
ISOLATOR
TYPE
ISOLATOR
PART NO.
021639703 2 LF, RF RP-3 Green
021639701 2
047792726 2 LF, RF CP-1-27
047792727 2
NUMBER
REQUIRED
KIT of FOUR
PART NO.
350014857
350014839
LOCATION
LB, RB RP-3 Red
LB, RB CP-1-26
ISOLATOR
DESCRIPTION
RBI
LBI
RFI
Control
Panel
LFI
Corner Weights
AGZ
Unit
Model
010A 261 367 159 223
013A 372 526 184 260
017A 402 568 200 282
020A 484 621 226 291
025A 499 646 232 301
029A 621 647 326 339
034A 678 784 334 386
RF LF RB LB
Chilled Water System
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. 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.
6
AGZ 010A through 034A IOMM AGZ1
4. A means of maintaining adequat e system water pressure (expansi on tank or regulating valve).
Ai
5. Temperature and pressure indicators located at the unit to aid in unit servicing. Pressure gauge
taps must be installed in the chilled water inlet and outlet piping or as shown in Figure 4.
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. A 40-mesh strainer is required in the water line just before the inlet of the evaporator. This will
help prevent foreign material from entering and decreasing the performance of the evaporator.
CAUTION
If separate disconnect is us ed for the 110V supply to the evaporator heating cable, mark the
disconnect clearly to ensure disconnect is not acc identally shut off during c old seas ons . This
could cause a failure of the evaporator.
8. The brazed plate evaporator has a thermostat and heating cable to prevent freeze-up down to
-20°F (-29°C). It is suggested that the heati ng cable be wired to a separate 110V supp ly circuit.
As shipped from the factory, the heating cable is wired to the control circuit. Protect all water
piping to the unit from freezing.
9. If the unit is used as a replacement chiller on a previously existing piping system, flush the
system thoroughly before unit installation. Regular water analysis and chemical water treatment
on the evaporator is recommended immediately at equipment start-up.
10. 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. Reset the freezestat and low leaving water alarm
temperatures. The freezestat is factory set to default at 38°F (3.3°C). 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” on page 9 for additional information
concerning glycol .
11. Perform a preliminary leak check before insulating the piping and filling the system.
12. Piping insulation should include a vapor barrier to prevent condensation and possible damage to
the building structure.
Figure 4, Typical Field Evaporator Water Piping
r
Vent
Inlet
P
Outlet
Drain
NOTES
:
1. Chilled water piping within the unit enclosure must be insulated in the field.
2. Piping should be supported independently of the unit and be installed per local codes.
IOMM AGZ1 AGZ 010A through 034A
Vibration
Eliminators
Strainer
Isolation
Valves
Flow
Switch
7
System Volume
It is important to have adequate water volume in the system to provide an opportunity for the chiller
to sense a load change, adjust to the change and stabilize. As the expected load change becomes
more rapid, a greater water volume is needed. The system water volume is the total amount of water
in the evaporator, air handling products and associated piping. If the water volume is too low,
operational problems can occur, including rapid compressor cycling, rapid loading and unloading of
compressors, erratic refrigerant flow in the chiller, improper motor cooling, shortened equipment life
and other undesirable occurrences.
For normal comfort cooling applications, where the cooling load changes relatively slowly, we
recommend a minimum system volume of five minutes times the flow rate (GPM). For example, if
the design chiller flow rate is 120 GPM, we recommend a minimum system volume of 600 gallons
(120 GPM x 5 minutes).
Since there are many other factors that can influence performance, systems may successfully operate
below these suggestions. However, as the water volume decreases below these suggestions, the
possibility of problems increases.
Variable Chilled Water flow
Variab le chilled water flow systems are not recommended for this class of equipment due to limited
unloading capability.
Flow Switch
Mount a water flow switch in the leaving
water line to shut down the unit when water
flow is interrupted.
Figure 5, Flow Switch Installation
A flow switch is available from McQuay
(part number 017503300). It is a “paddle”
type switch and adaptable to pipe sizes
down to 1 1/4” (32mm) nominal. Certain
minimum flow rates are required to close
the switch and are listed in Table 2. Install
the switch as shown in Figure 5. Connect
the normally open contacts of the flow
switch in the unit control center at terminals
4 and 5. 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. Follow installation instructions provided with the flow switch. Calibrate the flow
switch to open at one-half of nominal flow rate.
NOTE:
Differential pressure switches are not recommended for outdoor installation.
Table 2, Flow Switch Settings
Pipe Size
Minimum
Adjustment
Maximum
Adjustment
Flow
No
Flow
Flow
No
Flow
inch 1 1/4 1 1/2 2 2 1/2 3 4
mm 32 38 51 63 76 102
gpm 4.8 6.3 9.9 15.3 24.4 33.3
Lpm 18.2 22.7 37.5 57.9 92.4 126.0
gpm 3.0 3.6 5.9 9.5 15.4 21.1
Lpm 11.3 13.6 22.3 36.0 58.3 79.9
gpm 7.7 10.0 15.8 23.7 35.5 61.4
Lpm 29.1 37.9 59.8 89.7 134.4 232.4
gpm 5.9 7.0 11.0 17.0 29.2 37.7
Lpm 22.3 26.5 41.6 64.3 110.5 142.7
8
AGZ 010A through 034A IOMM AGZ1
Water Connections
The unit has 3-inch holes for the chilled water piping to enter the unit. The connections are made to
the evaporator water connections located within the unit. Water piping within the unit must be field
insulated.
Refrigerant Charge
All units are designed with HCFC-22. See the nameplate for specific refrigerant used. Units are
shipped with an operating charge. The operating charge (using HCFC-22) for each unit is shown in in
the Physical Data Tables on pages 13 and 14.
Unit Component Location
Control Panel
Tandem Scroll
Compressors
Charging Valve
Evaporator
Solenoid Valve, Expansion Valve
Optional Hot Gas Bypass ValveFilter Drier
Glycol Solutions
The use of glycol antifreeze solutions will decrease unit capacity and increase the pressure drop
through the cooler. See Product Manual PM AGZ1 for specific ratings and correction factors.
CAUTION
Do not use automotive grade antifreeze. Industrial grade glycols must be used. Autom otive
antifreeze contains inhibitors that will cause plating on the copper tubes within the chiller
evaporator. The type and handling of glycol used must be consistent with local codes.
Evaporator Water Flow and Pressure Drop
Evaporator flow rate must fall between the minimum and maximum values shown in the evaporator
pressure drop curve, Figure 6. Flow rates outside of these limits result in a chilled water Delta-T
outside the operating range of the controller.
Measure the chilled water pressur e drop through the evaporator a t field-installed p ressure taps. It is
important not to include the effect of valves or strainers in these readings.
Varying chilled water flow through the evaporator while the compressors are operating is not
recommended.
IOMM AGZ1 AGZ 010A through 034A
9
Figure 6, Evaporator Water Pressure Drop Curve
AGZ 010
AGZ 020
AGZ 025
AGZ 029
AGZ 034
10
AGZ 017
AGZ 013
AGZ
Model
010 15.0 0.9 2.4 7.1 24.0 1.5 5.8 17.3 40.0 2.5 15.2 45.5
013 19.5 1.2 1.5 4.5 31.2 2.0 3.7 11.0 52.0 3.3 9.6 28.9
017 24.0 1.5 1.7 5.0 38.4 2.4 4.1 12.2 64.0 4.0 10.7 32.1
020 30.0 1.9 2.3 6.8 48.0 3.0 5.6 16.7 80.0 5.0 14.5 43.4
025 34.5 2.2 1.8 5.3 55.2 3.5 4.3 13.0 92.0 5.8 11.4 34.3
029 40.7 2.6 1.7 5.0 65.0 4.1 4.0 12.1 108.4 6.8 10.9 32.6
034 49.8 3.1 1.6 4.7 79.7 5.0 3.9 11.7 132.8 8.4 10.4 31.2
Minimum Flow Nominal Flow Maximum Flow
Flow Rate
gpm L/s
Pressure Drop
ft. kPa
Flow Rate
gpm L/s
Pressure Drop
ft. kPa
Flow Rate
gpm L/s
Pressure Drop
ft. kPa
AGZ 010A through 034A IOMM AGZ1
Control Layout and Operation
Control Center
All electrical controls are enclosed in a weatherproof control center with tool-locked, hinged access
doors. The left-hand section contains the microprocessor controller and control input and output
terminals. All high-voltage components are located on the right side of the panel.
ON/OFF Switch
Control
Transformer
24-Volt Trans.
MicroTech II
SpeedTrol Location
Field Connection
Terminals
Start-up and Shutdown
Pre Start-up
1. The chilled-water system should be flushed and cleaned. Proper water treatment is required to
prevent corrosion and organic growth.
2. Open all electric disconnects and check all electric connections for tightness.
3. Inspect all water piping for flow direction and correct connections at the evaporator.
4. Verify thermostat water temperature sensor is installed in the leaving water line (supply to
building). On all AGZ units the sensor well and sensor are factory mounted.
5. Check compressor oil level. The oil level should be visible in the oil sightglass.
6. Check voltage of the unit power supply and make certain voltage is within ±10% of nameplate
rating. Check unit power supply wiring for proper ampacity and a minimum insulation
temperature of 75°C. Check for proper phasing using a phase sequence meter.
7. Verify all mechanical and electrical inspections have been completed according to local codes.
8. Open control stop switch S1(off). Turn on the main power and control disconnect switches. This
will energize crankcase heaters. Wait at least 24 hours before starting up unit.
9. Open all water flow valves and start the chilled water pump. Check all piping for leaks and vent
the air from the evaporator as well as from the system piping. Flush the evaporator and system
piping to obtain clean, noncorrosive water in the evaporator.
Non-Fused Disc.
or
Power Block
Fan
Contactors
Fan
Protection
Compressor Contactors
Start-up
1. Set temperature controller to the desired chilled water temperature. Set the chilled water
Delta-T.
2. Start auxiliary equipment by turning on the following: time clock (if present), ambient thermostat
and/or remote on/off switch, chilled water pump.
3. If the controller calls for cooling, the unit will begin the start-up sequence.
4. After running the unit for a short time, check t he oil level in the compressor (1/4 to 1/3 of the
glass), rotat ion of fans, and flashing in refrigerant sightgl ass.
IOMM AGZ1 AGZ 010A through 034A
11
5. Verify superheat temperature is at the factory setting of 8 to 12 degrees F (4.4 to 6.7 degrees C).
6. After system performance has stabilized, complete the current AGZ Start-Up Form (obtainable
from the local McQuay sales office) to establish inception of warranty benefits. Return the form
to McQuay International through your sale s representative.
Sequence of Operation
The following sequence of operation is typical for Models AGZ 010A through AGZ 034A. It can
vary depending upon options.
Start-Up
With the control circuit power on, 115V power is ap plied through the co ntrol circuit fuse F1 to the
compressor crankcase heaters, the compressor motor protections and the primary of the 24V control
circuit transformer. The 24V transformer provides power to the microprocessor controller.
When a remote time clock, manual switch, or the unit controller turns on the chilled water pump, the
flow switch closes and satisfies the flow requirement. If the chilled water temperature is above the
stage-on temperature, and all equipment protection devices are closed, the unit will start. The
controller will operate the unit in response to the leaving chiller water temperature, reset signals that
may be present and any equipment protection signals that may occur.
Equipment Protection Alarms
The following conditions will shut down the unit and activate the alarm circuit:
• No evaporator water flow Low evaporator pressure
• High condenser pressur e Motor protection system
• Phase voltage protection (Optional) Outside ambient temperature
• Evaporator freeze protection Sensor failures
The following alarms will limit unit operation:
• Condenser pressure stage down, unloads unit at high discharge p ressures
• Low ambient lockout, shuts off unit at low ambient temperatures
• Low evaporator pressure hold, holds stage #1 until pressure rises
• Low evaporator pressure unload, shuts off stage #2
12
Unit Enable Selection
Enables unit operation from local keypad, digital input, or Building Automation System.
Unit Mode Selection
Selects standard cooling, ice, glycol, or test operation mode.
Condenser fan control
Control of condenser fans is provided by the MicroTech II controller. The control steps condenser
fans based on discharge pressure.
Shutdown
As the leaving water control is satisfied, it will stage off the lag compressor unloading the unit. The
second stage will de-energize the liquid line solenoid valve SV1 and shut off the lead compressor.
The compressor crankcase heaters will energize when the compressors shut off, keeping the small
amount of refrigerant in the plate heat exchanger from migrating to the compressor. See page 38 for
detailed explanation of compressor staging.
AGZ 010A through 034A IOMM AGZ1
Physical Data
Table 3, Physical Data, AGZ 010A through 017A
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW) 9.8 (34.3) 13.3 (46.6) 15.9 (55.7)
Number Of Refrigerant Circuits 1 1 1
Unit Operating Charge, R-22, Lb. (kg) 22.0 (10.0) 24.0 (10.9) 31.0 (14.1)
Cabinet Dimensions, LxWxH, In. 73.6 x 46.3 x 50.8 73.6 x 46.3 x 50.8 73.6 x 46.3 x 50.8
Cabinet Dimensions, LxWxH, (mm) (1869) x (1176) x (1289) (1869) x (1176) x (1289) (1869) x (1176) x (1289)
Unit Operating Weight, Lb. (kg) 1090 (495) 1340 (608) 1450 (658)
Unit Shipping Wei ght, Lb. (kg) 1160 (527) 1400 (636) 1515 (688)
Add'l Weight If Copper Finned Coils, Lb. (kg) 220 (99.7) 220 (99.7) 220 (99.7)
COMPRESSORS
Type Scroll Scroll Scroll
Nominal Tons Per Compressor 6.0 / 6.0 7.5 / 7.5 9.0 / 9.0
Oil Charge Per Compressor, Oz. (g) 60 (1701) 140 (3969) 140 (3969)
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DSPLACEMENT
Standard Staging 0 – 50 – 100 0 – 50 – 100 0 – 50 – 100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, One of Two Sides, Sq. Ft. (M2) 30.3 (2.8) 30.3 (2.8) 30.3 (2.8)
Finned Height x Finned Length, In. 84 x 52 84 x 52 84 x 52
Finned Height x Finned Length, (mm) (2134) x (1321) (2134) x (1321) (2134) x (1321)
Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 3
Pumpdown Capacity Lb. (kg) 35.3 (16.0) 35.3 (16.0) 50.3 (22.8)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, In. (mm) 2 – 26 (660) 2 – 26 (660) 2 – 26 (660)
Number Of Motors - HP (kW) 2 – 1.0 (0.75) 2 – 1.0 (0.75) 2 – 1.0 (0.75)
Fan And Motor RPM, 60 Hz 1140 1140 1140
60 Hz Total Unit Airflow, CFM (l/s) 13950 (6584) 13950 (6584) 12000 (5664)
DIRECT EXPANSION EVAPORATOR - BRAZED PLATE-TO-PLATE
Connection Size Victaul i c, In. (mm) 2 (51) 2 (51) 2 (51)
Water Volume, Gallons (L) .94 (3.6) 1.66 (6.3) 2.00 (7.6)
Maximum Refrigerant Working Pressure, psig (k P a) 450 (3103) 450 (3103) 450 (3103)
Maximum Water P ressure, psig (kPa) 350 (2413) 350 (2413) 350 (2413)
NOTE:
Nominal capacity based on 95°F ambient air and 54°F/44°F water range.
010A 013A 017A
AGZ MODEL NUMBER
IOMM AGZ1 AGZ 010A through 034A
13
Table 4, Physical Data, AGZ 020A through 034A
PHYSICAL DATA
BASIC DATA
Unit Capacity @ ARI Conditions (1), Tons (kW) 20.4 (71.4) 22.7 (79.5) 28. 2 (98.7) 34.0 (119.0)
Number Of Refrigerant Circuits 1 1 1 1
Unit Operating Charge, R-22, Lb. (kg) 34.0 (15.4) 36.0 (16.3) 47.0 (21.3) 50.0 (22.7)
Cabinet Dimensions, LxWxH, In. 106.2x 46.3 x 50.8 106.2x 46.3 x 50.8 106.2x 46.3 x 58.8 106.2x 46.3 x 58.8
Cabinet Dimensions, LxWxH, (mm)
Unit Operating Weight, Lbs. (kg) 1620 (735) 1675 (760) 1930 (876) 2180 (990)
Unit Shipping Wei ght, Lbs. (kg) 1700 (772) 1750 (794) 2000 (908) 2230 (1012)
Add'l Weight If Copper Finned Coils, Lb. (kg) 350 (159) 350 (159) 435 (197) 435 (197)
COMPRESSORS
Type Scroll Scroll Scroll Scroll
Nominal Horsepower 10.0 / 13.0 13.0 / 13.0 15.0 / 15.0 20.0 / 20.0
Oil Charge Per Compressor, Oz. (g) 140 (3969) 140 (3969) 140 (3969) 296 (8392)
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Standard Staging 0 – 45 - 100 0 – 50 – 100 0 – 50 – 100 0 – 50 – 100
CONDENSERS - HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLING
Coil Face Area, One of Two Sides, Sq. Ft. (M2) 49.0 (4.6) 49.0 (4.6) 58.3 (5.4) 58.3 (5.4)
Finned Height x Finned Length, In. 84 x 84 84 x 84 100 x 84 100 x 84
Finned Height x Finned Length, (mm) (2134) x (2134) (2134) x (2134) (2545 ) x (2134) (2545 ) x (2134)
Fins Per Inch x Rows Deep 16 x 2 16 x 2 16 x 3 16 x 3
Pumpdown Capacity lb. (kg) 53.1 (24.0) 53.1 (24.0) 90.7 (41.1) 92.8 (42.0)
CONDENSER FANS - DIRECT DRIVE PROPELLER TYPE
Number Of Fans - Fan Diameter, In. (mm) 3 – 26 (660) 3 – 26 (660) 3 – 26 (660) 3 – 26 (660)
Number Of Motors - HP (kW) 3 – 1.0 (0.75) 3 – 1.0 (0.75) 3 – 1.0 (0.75) 3 – 1.0 (0.75)
Fan And Motor RPM, 60 Hz 1140 1140 1140 1140
60 Hz Total Unit Airflow, CFM (l/s) 20925 (9877) 20925 (9877) 19800 (9346) 19800 (9346)
DIRECT EXPANSION EVAPORATOR - BRAZED PLATE-TO-PLATE
Connection Size Victaul i c, In. (mm) 2 (51) 2 (51) 2 (51) 2 (51)
Water Volume, Gallons (L) 2.16 (8.2) 3.05 (11.5) 4.00 (15.1) 5.55 (21.0)
Max. Refrigerant Working Pressure, psig (kPa) 450 (3103) 450 (3103) 450 (3103) 450 (3103)
Maximum Water P ressure, psig (kPa) 350 (2413) 350 (2413) 350 (2413) 350 (2413)
NOTE:
Nominal capacity based on 95°F ambient air and 54°F/44°F water range.
020A 025A 029A 034A
(2697) x (1176) x
(1289)
AGZ MODEL NUMBER
(2697) x (1176) x
(1289)
(2697) x (1176) x
(1493)
(2697) x (1176) x
(1493)
14
AGZ 010A through 034A IOMM AGZ1
Electrical Data
Field Wiring
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.
AGZ 010A through AGZ 034A units have single point power connection. A single field supplied
fused disconnect is required. The control transformer is factory mounted.
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 evaporator heater.
Table 5. AGZ 010A – 034A Electrical Data Single Point
AGZ
Unit
Size
010A
013A
017A
020A
025A
029A
034A
See "Electrical Notes" on page 18.
Minimum
Volts Hz.
208 54 3 6 1 1.00 (25) 60 70
230 54 3 6 1 1.00 (25) 60 70
460 26 3 10 1 1.00 (25) 30 35
575
208 65 3 6 1 1.00 (25) 80 80
230 65 3 6 1 1.00 (25) 80 80
460 34 3 10 1 1.00 (25) 40 45
575
208 79 3 4 1 1.00 (25) 90 100
230 79 3 4 1 1.00 (25) 90 100
460 41 3 8 1 1.00 (25) 45 50
575
208 103 3 2 1 1.25 (32) 125 125
230 103 3 2 1 1.25 (32) 125 125
460 53 3 6 1 1.00 (25) 60 70
575
208 110 3 2 1 1.25 (32) 125 150
230 110 3 2 1 1.25 (32) 125 150
460 58 3 6 1 1.00 (25) 70 80
575
208 136 3 1/0 1 1.50 (38) 150 175
230 136 3 1/0 1 1.50 (38) 150 175
460 62 3 6 1 1.00 (25) 70 80
575
208 175 3 2/0 1 1.50 (38) 200 225
230 175 3 2/0 1 1.50 (38) 200 225
460 88 3 3 1 1.25 (32) 100 110
575
Circuit
Ampacity
(MCA)
60
23 3 10 1 1.00 (25) 30 30
60
27 3 10 1 1.00 (25) 30 35
60
33 3 10 1 1.00 (25) 40 40
60
45 3 8 1 1.00 (25) 50 60
60
48 3 8 1 1.00 (25) 60 60
60
58 3 6 1 1.00 (25) 70 70
60
72 3 4 1 1.00 (25) 90 100
Field Wire Hub or HACR Breaker Size
Quantity
Power Supply Field Fuse Size
Wire
Gauge
Quantity
Nominal
Size
In. (mm)
Recommended Maximum
IOMM AGZ1 AGZ 010A through 034A
15
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