McQuay PM AGZ-2, AGZ 030AM, AGZ 030AS, AGZ 050AM, AGZ 065AS Product Manual
Product Manual
Air-Cooled Scroll Compressor Chiller
AGZ 030AS - 065AS, Packaged Chiller
AGZ 030AM – 050AM, Chiller with Remote Evaporator
60 Hertz, R-22
PM AGZ-2
Group: Chiller
Effective: May 1999
Supersedes: PM AGZ-1
© 1997 McQuay International
Table of Contents
Introduction...................................................................................................3
Features and Benefits....................................................................................3
Design Advantages........................................................................................4
Selection Procedure.....................................................................................10
Packaged Chiller, Model AS..................................................................................................................10
Remote Evaporator, Model AM ............................................................................................................12
Application Adjustment Factors..................................................................14
Performance Data........................................................................................17
Part Load Data.............................................................................................19
Sound Data..................................................................................................20
Pressure Drop Curves..................................................................................23
Electrical Data.............................................................................................24
Physical Data...............................................................................................30
AGZ-AS..................................................................................................................................................30
AGZ-AM.................................................................................................................................................32
Dimensional Data........................................................................................33
Application Data..........................................................................................36
Optional Features........................................................................................39
MicroTech...............................................................................................................................................40
Product Specification ..................................................................................41
NOTE: The Model AGZ 030AM through
AGZ 050AM chillers with remote
evaporators are not included in the ARI
Certification Program.
Our facility is ISO9002 Certified
"Illustrations cover the general appearance of McQuay International products at the time of publication and we
2 AGZ 030A through 065A Product Manual AGZ-2
"McQuay" is a registered trademark of McQuay International
reserve the right to make changes in design and construction at anytime without notice"
1997 McQuay International
Introduction
Global
McQuay offers air-cooled chillers from 10 through 425 tons (35 – 1500 kW). This
manual covers two varieties of the scroll compressor, air-cooled Global Chiller Line:
AGZ 030AS through AGZ 065AS, Packaged Air-Cooled Chillers
AGZ 030AM through AGZ 050AM, Air-Cooled with Remote Evaporator.
Nomenclature
A G Z - XXX A S
Air-Cooled
Scroll Compressor
Model Size
AGZ AS Models ARI 550/590-98 Certified
Features and Benefits
Efficiency
Reliability
Application
S= Standard Cooling
M= Remote Evaporator
Design Vintage
• Cross-circuit compressor staging
• Copeland tandem scroll compressors
• Exceeds ASHRAE Std 90.1 for efficiency
• Rugged compressor design
• Factory installed operating and safety
controls
• Code and agency approval
Flexibility
Serviceability
Product Manual AGZ-2 AGZ 030A through 065A 3
• Complete factory assembly
• Sizes available in 5 ton increments
• All sizes available from stock
• SpeedTrol (optional)
• Small footprint
• Dual refrigerant circuits
• Easy servicing -- Electrical and refrigerant
components are readily accessible
• Two control options
Design Advantages
The McQuay AGZ Air-Cooled Global Chiller is a product of the McQuay commitment to
offer quiet, reliable, energy efficient equipment. An approach incorporating high quality
compressors, state-of-the-art coil design, and innovative packaging.
Construction
Factory assembled and mounted on heavy-gauge painted phosphatized galvanized steel channel base.
This base distributes the unit weight for roof loading. Varied and convenient installation is possible by
virtue of the units small footprint.
Compressors
Copeland’s Compliant Scroll tandem compressors are used. These rugged hermetic compressors are
constructed with an integral cast iron frame, cast iron scrolls, three Teflon impregnated bearings, and
three oil filtration devices for each compressor.
Using Copeland's Compliant Scroll tandems provides four steps of modulation. One through four
compressors can run, depending on the load of the system, resulting in excellent part-load efficiency.
Each refrigerant circuit has two specially designed oil and gas equalization lines to control oil
migration.
The design also offers radial and axial compliance (no tip seals), a large internal volume for liquid
handling, a removable suction screen, and a rotary dirt trap and oil screen. In addition, the compressor
is self-compensating for wear, handles liquid and debris, and inherently yields the highest efficiency for
its class.
A fail-safe compressor by design-includes a solid state motor protection module, 4 individual motorwinding sensors, a patented internal discharge temperature probe, and a patented shutdown feature that
prevents reverse rotation. An internal discharge check valve helps prevent shutdown noise and comes
standard with high and low pressure taps with Schrader valves, a sight glass, an oil level adjustment
valve, and an off cycle crankcase heater.
Units are available in 60 Hertz electrical voltage configurations from 208 to 575 volt operating at
3500 RPM.
Condenser Coils
Condenser coils have internally enhanced seamless copper tubes arranged in a staggered row pattern.
The coils are mechanically expanded into McQuay lanced and rippled aluminum fins with full fin
collars. An integral subcooler circuit provides subcooling to effectively eliminate the possibility of
liquid flashing. The external condenser coils are fitted with a protective wire mesh guard.
Condenser Fans and Motors
Multiple direct drive dynamically balanced propeller fans operate in formed venturi openings at low tip
speeds for maximum efficiency and minimum noise and vibration. A heavy-gauge vinyl-coated fan
guard protects each fan.
Each condenser fan motor is heavy-duty, 3-phase with permanently lubricated ball bearings and
inherent overload protection. SpeedTrol option includes a single-phase motor with fan speed control
on the lead fan for each circuit. Totally enclosed fan motors are available as an option on all sizes.
4 AGZ 030A through 065A Product Manual AGZ-2
Evaporator
The evaporator is direct expansion, shell-and-tube type with water flowing in the baffled shell side and
refrigerant flowing through the tubes. Two independent refrigerant circuits within the evaporator
serve the units dual refrigerant circuits.
The evaporator has a carbon steel shell and seamless high efficiency copper tubes roller expanded into
a carbon steel tube sheet. Water baffles are polypropylene to resist corrosion.
Refrigerant heads are carbon steel with multi-pass baffles to ensure oil return and are removable to
permit access to the tubes from either end. For water removal, 3/8" (10mm) vent and drain plugs are
provided on the top and bottom of the shell.
The evaporator is wrapped with an electric resistance heater cable and insulated with 3/4" (19mm)
thick vinyl nitrate polymer sheet insulation, protecting against water freeze-up at ambient air
temperatures to -20°F (-29°C). An ambient air thermostat controls the heater cable.
The fitted and glued in place insulation has a K factor of 0.28 at 75°F (23°C).
The refrigerant (tube) side maximum working pressure is 225 psig (1552 kPa). The water side
working pressure is 175 psig (1207 kPa). Each evaporator is designed, constructed, inspected, and
stamped according to the requirements of the ASME Boiler and Pressure Vessel Code. Double
thickness insulation is available as an option.
On Model AGZ ---AM units the evaporator is shipped separate for field mounting and piping to the
outdoor unit. The refrigeration piping specialties shown in Figure 1 are furnished and installed by the
installing contractor.
NOTE: A water flow switch or both water flow switch and water pump starter interlock, must be
field installed and wired to protect against evaporator freeze-up under low water flow conditions.
Figure 1, AGZ ---AM Remote Evaporator Piping Schematic (one of two circuits
shown)
Product Manual AGZ-2 AGZ 030A through 065A 5
Electrical Control Center
Operating and safety controls and motor starting components are separately housed in a centrally
located, weatherproof control panel with hinged and key locked doors. In addition to one of the three
types of control described in the next sections, the following components are housed in the panel:
• Power terminal block, single point standard
• Control, input, and output terminal block
• Control transformer
• Optional disconnect switch with through-the-door handle
• Compressor contactors (circuit breakers are available as an option) Compressor motor inherent
thermal and overload protection is standard
• Phase voltage monitor with under/over/phase reversal protection
• Fan contactors with separate fuse blocks
• Optional ground fault protection
• The standard FanTrol system controls fan staging for control of refrigerant discharge pressure.
The FanTrol system cycles condenser fans based on discharge pressure and outdoor temperature
and is suited for operation to 40°F (4.4°C).
• The optional SpeedTrol control uses both fan cycling and fan speed control on the lead fan per
circuit and allows operation to 0°F (-18°C) outdoor temperature.
• Mechanical high pressure cutout
Global UNT Control (Standard)
Microprocessor based control that accomplishes unit capacity control by 4-stage cross-circuit
compressor cycling based on leaving chilled water temperature. Set point and control band are easily
field adjusted. Anti-cycling and stage delay relays are included. Safety controls include low and high
refrigerant pressure, low evaporator flow, sensor failures, and evaporator freeze protection. Motor
protection includes phase voltage, volts ratio, and solid state compressor motor protection. Outside
air reset using a 4-20ma signal is standard. Return water reset, demand limit reset and remote reset
using a 4 to 20 ma signal are available options.
On remote evaporator models AGZ ---AM the leaving chilled water sensor is wired to the unit control
panel and comes with 30 feet (10 m) of cable to enable placing the bulb in the thermowell of the
evaporator. If the distance is greater than 30 feet (10 m), a field splice is required.
Figure 2, Standard Global UNT Controller
6 AGZ 030A through 065A Product Manual AGZ-2
Global UNT with Optional Zone Terminal
Provides for onboard (or remotely wired) monitoring or adjusting of certain functions.
• Monitoring
• Monitor up to three setting or sensed values
• Monitor 18 different on/off inputs
• Monitor alarm status via a flashing alarm light and flashing symbol
• Adjusting, allows adjustment of any flashing set points, three at a time, typically set up so that the
relationship between values can be viewed simultaneously. For example
• Display 1 = Lvg Water temp
• Display 2 = Lvg Water SP
• Display 3 = % Unit Load
Product Manual AGZ-2 AGZ 030A through 065A 7
Figure 3, Optional Zone Terminal Configuration
Display Item List
Display Indicator Dot
Warning Signal
On/Off Status
Display
Button 1
Mode
Selector
Button
Mode
Selector
Panel
Door
2
3
McQuay AGZ/AGR Global Chiller
Lvg Water Temp
Evap Pres #1
Eva p Pres #2
OA/AI 3 Input
OA/AI 3 HiLim SP
OA/AI 3 Reset SP
Lvg Water S P
LvgW tr RBnd SP
Cont rl Band SP
Actu al Lvg SP
Unoc cpd Lvg SP
OA Lo ckout S P
% Un it Load
Lvg Low Li m SP
SoftS ta Capc ty
SoftS tart Ti me
Cir # 1 Start s
Cir #2 Star ts
Operatin g Mode Indicato r
MONITOR
ADJUST
TIME SCHEDULE
PASSWORD
ENTER
INSERT 10
Display Area 11
Display Area 21
Display Area 31
Up/Dow n Arrow Keys
ON OFF
Occ upied
Flow Failure
OA L ockout
Cir# 2Lead=On
Pmp/ Stp #1=0
Pmp/S tp #2=0
Solen oid #1
Solen oid #2
Frzs tat#1Alm
Frzs tat#2Alm
MinL owPres#1
MinL owPres#2
Com pressor 1
Com pressor 2
Sta ge 3
Sta ge 4
Stage 5 Opt.
Stag e 6 Opt .
Alarm L ight
ALAR M
AGZ-AGR
8 AGZ 030A through 065A Product Manual AGZ-2
MicroTech Control (optional)
Exclusive microprocessor control common throughout McQuay equipment. The interface is a 12 key
keypad and 2-line, 16 character backlit liquid crystal display in plain English. The MicroTech
continuously performs self-diagnostic checks on all system temperatures, pressures, and safeties, and
will automatically shut down a circuit or the entire unit at fault conditions, and close a set of alarm
contacts. The cause, time, and date of the occurrence, as well as important operating conditions, are
recorded and can be displayed by pressing the “Alarm” button.
Enhanced head pressure control logic results in increased SEER during transitional seasons.
Critical shutdown alarms such as high condenser pressure (with mechanical back up), freeze
protection, and low evaporator pressure are manual reset and must be cleared at the keypad to resume
operation.
Tampering is eliminated by use of password protection against unauthorized changing of setpoints and
other control parameters.
An optional modem kit and software package allows remote monitoring and control of the chiller
from an off-site PC via a direct dial telephone line.
Choose the MicroTech control and Open Protocol options to interface with virtually any building
management system and perform remote monitoring and control by hard wiring or modem.
On remote evaporator models AGZ---AM the leaving chilled water sensor is wired to the unit control
panel and comes with 30 feet (10 m) of cable to enable placing the bulb in the thermowell of the
evaporator. If the distance is greater than 30 feet (10 m), a field splice is required.
Figure 4, Optional MicroTech Control Panel
Product Manual AGZ-2 AGZ 030A through 065A 9
Selection Procedure
Packaged Chiller, Model AS
Selection with Inch-Pound (I-P) units
Table 9 covers the range of leaving evaporator water temperatures and outside ambient temperatures
included under ARI 550/590-98. The tables are based on a 10 degree F (5.5 degree c) temperature
drop through the evaporator. Adjustment factors for applications having other than a 10 degree F (5.5
degree C) drop can be found in Table 3. The minimum leaving chilled water temperature setpoint
without glycol is 40°F (4°C) . For brine selections, see Table 1 for ethylene or Table 2 for propylene
glycol adjustment factors. Ratings are based on a 0.0001 fouling factor in the evaporator at sea level
operation. For other fouling factors, different delta-Ts, or altitude correction factors see Table 3. For
applications outside the catalog ratings contact your local McQuay sales representative.
Selection example
Given:
50 tons minimum
95°F ambient temperature
120 gpm, 54°F to 44°F chilled water
0.0001 evaporator fouling factor
1. From Performance Table 9, an AGZ 055AS at the given conditions will produce 54.0 tons with a
compressor kW input of 59.0 and a unit EER of 9.9.
2. Use the following formula to calculate any unknown elements.
tons°×
F
3. Determine the evaporator pressure drop. Using Figure 8, enter at 120 gpm and follow up to the
AGZ 055AS line intersect. Read horizontally to obtain an evaporator pressure drop of 14.0 feet
of water.
24
gpm =
Selection example using ethylene glycol
Given:
45 tons minimum
95°F ambient air temperature
54°F - 44°F chilled water temperature
0.0001 evaporator fouling factor
Protect from freezing down to 0°F
1. From Table 1, select an ethylene glycol concentration of 40% to protect against freezing at 0°F.
2. At 40% ethylene glycol, the adjustment factors are: Capacity =0.961, kW = 0.976,
GPM = 1.121, pressure drop = 1.263
3. Select the AGZ 050AS and correct with 40% ethylene glycol factors.
4. Correct capacity = 0.961 X 49.0 tons = 47.1 tons
5. Correct compressor kW = 0.976 X 52.6 kW = 51.3 kW
6. Calculate chilled water flow:
241.47
tons°×
= capacity) corrected(at flowWater
10
F
Glycol flow (at 40% solution) = 1.121 X 113.0 gpm = 126.2 gpm
gpm 113.0 =
10 AGZ 030A through 065A Product Manual AGZ-2
Determine the evaporator pressure drop. Using Figure 8, enter at 112.6 gpm (water) and follow up to
the AGZ 050AS line intersect. Read horizontally to obtain an evaporator pressure drop of 12.3 feet.
The pressure drop for 40% solution = 1.263 X 12.3 feet = 15.5 feet for ethylene glycol.
Selection with SI units
Table 10 covers a range of leaving evaporator water temperatures and outside ambient temperatures.
The tables are based on a 5°C temperature drop through the evaporator. The minimum leaving chilled
water temperature setpoint without glycol is 4.5°C. For brine selections, see Table 1 for ethylene or
Table 2 for propylene glycol adjustment factors. Ratings are based on a 0.0176 fouling factor in the
evaporator at sea level operation. For other fouling factors, derates for different Delta-Ts, or altitude
correction factors see Table 3. For applications outside the catalog ratings contact your local McQuay
sales representative.
Selection example
Given:
190 kW minimum
35°C ambient air temperature
9 L/s, 12°C - 7°C chilled water
0.0176 evaporator fouling factor
1. From Table 10, an AGZ 055AS at the given conditions will produce 192.8 kW with a unit kW
input of 59.4 and a COP of 3.0.
2. Use the following formula to calculate any missing elements:
L/s
3. Determine the evaporator pressure drop. Using Figure 8, enter at 9.0 L/s and follow down to the
kW
18.4=°× C
AGZ 055AS line intersect. Read horizontally to obtain an evaporator pressure drop of 54.0 kPa.
Selection example using ethylene glycol
Given: 161 kW minimum
35°C ambient air temperature
12°C - 7°C chilled water temperature
0.0176 evaporator fouling factor
Protect against freezing down to -18°C
1. From Table 1, select an ethylene glycol concentration of 40% to protect against freezing.
2. At 40% ethylene glycol, the adjustment factors are: Capacity = 0.961, kW = 0.976,
GPM = 1.121, pressure drop = 1.263
3. Select the AGZ 050AS and from Table 10with 40% ethylene glycol factors.
4. Correct capacity = 0.961 X 175.1 kW = 168.3 kW
5. Correct compressor kW = 0.976 X 52.8 kW = 51.5 kW
6. Calculate chilled water flow:
3.168
Water flow (at corrected capacity) = L/s 8
Glycol flow (at 40% solution) = 1.121 X 8 L/s = 9 L/s
7. Determine the evaporator pressure drop. Using Figure 8, enter at 9 L/s and follow up to the
AGZ 050As line intersect. Read horizontally to obtain an evaporator pressure drop of 50.0 kPa.
The pressure drop for 40% solution = 1.263 X 50.0 kPa = 63.1 kPa
kW
518.4
°× C
=
Product Manual AGZ-2 AGZ 030A through 065A 11
Remote Evaporator, Model AM
Inch-Pound (I-P) Units
Since the AGZ-AM units always include a remote specific shell and tube heat exchanger, the ratings are
based on leaving chilled water temperature and ambient air temperature.
Table 9 (English) and Table 10 (SI) cover performance over the normal range of leaving chilled water
temperatures and outside ambient air temperatures. The tables are based on a 10°F (5.0°C)
temperature drop through the evaporator. Adjustment factors for other temperature drops can be
found in Table 3. The minimum leaving chilled water temperature setpoint without glycol is 40°F
(4.4°C). For brine selections, see Table 1 for ethylene or Table 2 for propylene glycol adjustment
factors. Ratings are based on a 0.0001 (0.0176) fouling factor in the evaporator at sea level operation.
For other fouling factors, derates for different delta-Ts, or altitude, see Table 3. For applications
outside the catalog ratings contact your local McQuay sales representative.
The length and configuration of the field installed interconnecting refrigerant piping will affect the
system capacity. Derates based on equivalent length of line are given in Table 8.
The steps for selecting an AGZ-AM are as follows:
1. Add 3% to the required cooling capacity (to approximate correction factors) and make a
preliminary unit selection from performance Table 9 through Error! Reference source not
found..
2. Divide the required capacity by the appropriate capacity correction factors: glycols from Table 1or
Table 2, altitude, chilled water Delta T, or fouling factor from Table 3; and refrigerant piping
derate from Table 8 as explained in step 3 below.
3. Determine the suction line size by first summing the equivalent feet (from Table 4) of all the
fittings (use a sketch of the piping layout) and adding the sum of these fitting losses to the actual
linear feet of tubing. This will then equal the total equivalent feet. (To use the equivalent feet
Table 4, start with the unit suction connection size from Table 6 as the first try). Now, knowing
the equivalent feet and the unit size, check the line selection in Table 6 or Table 7 and correct if
required.
4. If the unit rated capacity in the tables is less than the corrected required capacity, redo the selection
with the next larger unit. In most cases the line size will be the unit connection size. If the
selection is satisfactory, correct the power (if applicable) and determine water pressure drop.
Selection example
English Units
Given:
42 tons required capacity
95°F ambient temperature
Cool 100 gpm from 54°F to 44°F
0.0001 evaporator fouling factor
2,000 foot altitude
Figure 5, Sample Piping Layout
12 AGZ 030A through 065A Product Manual AGZ-2
1. Add 3% to the required capacity for approximate derate: 42 x 1.03 = 43.3 tons. From
Performance Table 9 an AGZ-045AM at the given conditions will produce 44.3 tons with a
compressor kW input of 46.9 and a unit EER of 10.0.
2. Determine derate factors:
Altitude correction from Table 3; 0.986 Capacity, 1.009 Power
3. Piping correction:
Assume 1 5/8” suction line based on connection size in Table 6, from Table 4
(3) 90° Standard ells 3 x 4 ft =12 ft
Plus actual linear feet 70 ft
Total Equivalent Feet 82 ft
Check Table 7 for size and find that 1 5/8” is minimum size for oil carry.
This means that the 1 5/8 riser will be satisfactory.
The capacity correction factor from Table 8 is 0.980.
4. The corrected capacity of the AGZ is: 44.3 tons x 0.986{altitude} x 0.98{piping} = 42.8 tons
This satisfies the 42 ton requirement.
5. Correct the compressor power required: 46.9 kW x 1.009{altitude} = 47.3 kW.
6. Calculate the unit power input from corrected EER:
W = BTU / EER W = 42.8 tons x 12 mbh / (10.1EER / 1.009) = 50.4 kW
7. Determine the evaporator pressure drop. Enter the pressure drop curves (Figure 8) at 100 gpm
and read up to AGZ 045AM, read over to pressure drop of 10.2 ft.
Selection example using ethylene glycol
Given: 40 tons minimum
95°F ambient air temperature
54°F - 44°F chilled water temperature
0.0001 evaporator fouling factor
Protect from freezing down to 0°F
1. From Table 1, select an ethylene glycol concentration of 40% to protect against freezing at 0°F.
2. At 40% ethylene glycol, the adjustment factors are: Capacity =0.961, kW = 0.976,
gpm = 1.121, pressure drop = 1.263
3. Select the AGZ-045AM and correct with 40% ethylene glycol factors.
4. Correct capacity = 0.961 X 44.3 tons = 42.6 tons
5. Correct compressor kW = 0.976 X 46.9 = 45.8 kW
6. Calculate chilled water flow:
246.42
tons°×
= capacity) corrected(at flowWater
10
F
Glycol flow (at 40% solution) = 1.121 X 102.2 gpm = 114.6 gpm
Determine the evaporator pressure drop. Using Figure 8, enter at 102.2 gpm (water) and follow up to
the AGZ-045AM line intersect. Read horizontally to obtain an evaporator pressure drop of 10.5 feet.
The pressure drop for 40% solution = 1.263 X 10.5 feet = 13.3 feet for ethylene glycol.
Correct for refrigerant piping pressure drop using Table 8. Assuming 150 equivalent feet, the
corrected capacity is 0.971 X 42.6 = 41.4 tons.
gpm 102.2 =
Selection example, SI Units
The selection procedure for Metric units is identical to English except that metric data and tables are
used.
Product Manual AGZ-2 AGZ 030A through 065A 13
Application Adjustment Factors
Ethylene and Propylene Glycol Factors
AGZ units can operate with a leaving chilled fluid temperature range of 20°F (-6°C) to 50°F (10°C).
A glycol solution is required when leaving chilled fluid temperature is below 40°F (4.6°C). The use
of glycol will reduce the performance of the unit depending on concentration.
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 3.
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 3.
Temperature drops outside this 6°F to 16°F (3.3°C to 8.9°C) range may 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).
Table 1, Ethylene Glycol
% Freeze Point
E.G. °F °C Capacity Power Flow PD
10 26 -3 0.991 0.996 1.013 1.070
20 18 -8 0.982 0.992 1.040 1.129
30 7 -14 0.972 0.986 1.074 1.181
40 -7 -22 0.961 0.976 1.121 1.263
50 -28 -33 0.946 0.966 1.178 1.308
Table 2, Propylene Glycol
% Freeze Point
P.G. °F °C Capacity Power Flow PD
10 26 -3 0.987 0.992 1.010 1.068
20 19 -7 0.975 0.985 1.028 1.147
30 9 -13 0.962 0.978 1.050 1.248
40 -5 -21 0.946 0.971 1.078 1.366
50 -27 -33 0.929 0.965 1.116 1.481
NOTE: Ethylene and propylene glycol ratings are outside the scope of
ARI Standard 550/590-98 certification program
Fouling Factor
Performance tables are based on water with a fouling factor of
performance decreases. For performance at other than 0.0001 (0.0176) fouling factor refer to Table
3.
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. To ensure optimum unit
operation, maintain proper water treatment.
22
)/0176.0(,,/0001.0
kWCmorBTUFhrft °×°×× per ARI 550/590-98. As fouling is increased,
14 AGZ 030A through 065A Product Manual AGZ-2
Table 3, Capacity and Power Derates
Chilled Water Fouling Factor
Delta-T 0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)
ALTITUDE °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
SEA 10 5.6 1.000 1.000 0.993 0.998 0.970 0.991 0.927 0.977
LEVEL 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
2000 feet 10 5.6 0.986 1.009 0.979 1.007 0.956 1.000 0.914 0.986
(610 m) 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
4000 feet 10 5.6 0.973 1.021 0.966 1.019 0.944 1.012 0.902 0.998
(1220 m) 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
6000 feet 10 5.6 0.959 1.031 0.952 1.029 0.930 1.022 0.889 1.008
(1830 m) 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
Table 4, Equivalent Feet for Fittings
Fitting Type 7/8 1 1/8 1 3/8 1 5/8 2 1/8 2 5/8 3 1/8
Elbows
90°° Standard
90°° Long Radius
90°° Street
45°° Standard
45°° Street
180°° Bend
Tees
Full Size 1.4 1.7 2.3 2.6 3.3 4.1 5.0
Reducing 2.0 2.6 3.3 4.0 5.0 6.0 7.5
Valves
Globe Valve, Open 22 29 38 43 55 69 84
Gate Valve, Open 0.9 1.0 1.5 1.8 2.3 2.8 3.2
Angle Valve, Open 9.0 12 15 18 24 29 35
2.0 2.6 3.3 4.0 5.0 6.0 7.5
1.4 1.7 2.3 2.6 3.3 4.1 5.0
3.2 4.1 5.6 6.3 8.2 10 12
0.9 1.3 1.7 2.1 2.6 3.2 4.0
1.5 2.1 3.0 3.4 4.5 5.2 6.4
3.2 4.1 5.6 6.3 8.2 10 12
Table 5, Recommended Liquid Line Size
Unit Model Size Up to Up to Up to Up to Up to
AGZ030AM 7/8" 7/8 " 7/8 " 7/8 " 7/8 " 7/8 "
AGZ035AM 7/8" 7/8 " 7/8 " 7/8 " 7/8 " 7/8 "
AGZ040AM 7/8" 7/8 " 7/8 " 7/8 " 7/8 " 7/8 "
AGZ045AM 7/8" 7/8 " 7/8 " 7/8 " 7/8 " 1 1/8 "
AGZ050AM 7/8" 7/8 " 7/8 " 7/8 " 1 1/8 " 1 1/8 "
Connection Recommended Liquid Line Size
At Unit 50 Equiv. Ft 75 Equiv. Ft 100 Equiv. Ft 125 Equiv. Ft 150 Equiv. Ft
Product Manual AGZ-2 AGZ 030A through 065A 15
Table 6, Recommended Horizontal or Downflow Suction Line Size
Unit Model Size Up to Up to Up to Up to Up to
AGZ030AM 1 5/8" 1 5/8" 1 5/8" 1 5/8" 1 5/8" 2 1/8"
AGZ035AM 1 5/8" 1 5/8" 1 5/8" 2 1/8" 2 1/8" 2 1/8"
AGZ040AM 1 5/8" 1 5/8" 1 5/8" 2 1/8" 2 1/8" 2 1/8"
AGZ045AM 1 5/8" 1 5/8" 2 1/8" 2 1/8" 2 1/8" 2 1/8"
AGZ050AM 1 5/8" 1 5/8" 2 1/8" 2 1/8" 2 1/8" 2 1/8"
Note: For horizontal and vertical downflow only
Connection Recommended Suction Line Sizes
At Unit 50 Equiv. Ft 75 Equiv. Ft 100 Equiv. Ft 125 Equiv. Ft 150 Equiv. Ft
Table 7, Minimum Line Size (R-22) For Oil Carry Up a Suction Riser
Unit Size OD AGZ 030 AGZ 035 AGR 040 AGZ 045 AGZ 050
Line Size 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8
Table 8, Refrigerant Piping Derates
Unit Model Capacity Loss Factor Due to Refrigerant Piping
AGZ030AM 1.0 0.984 0.975 0.966 0.957 0.987
AGZ035AM 1.0 0.973 0.960 0.987 0.984 0.981
AGZ040AM 1.0 0.971 0.957 0.984 0.980 0.976
AGZ045AM 1.0 0.957 0.985 0.980 0.975 0.971
AGZ050AM 1.0 0.957 0.981 0.975 0.969 0.962
At Unit 50 Equiv. Ft 75 Equiv. Ft 100 Equiv. Ft 125 Equiv. Ft 150 Equiv. Ft
16 AGZ 030A through 065A Product Manual AGZ-2
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