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CAUJ 20-120 Tons
Catalogue
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Trane CAUJ 20-120 Tons Catalogue

Product Catalog
Air-Cooled Condensers — CAUJ 20-120 Tons
August 2011 ACDS-PRC003-EN

Introduction

Air-Cooled Condensers Built for Every Need
Trane has the right condenser...
© 2011 Trane All rights reserved ACDS-PRC003-EN
Table of Contents
Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Model Number Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Selection Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Performance Adjustment Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
20 to 120 Ton Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Durable Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Microchannel Condenser Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
ACDS-PRC003-EN 3

Features and Benefits

Microchannel Flat Tube
Header (top removed)
Ribbon Fin

20 to 120 Ton Units

Trane 20 to 120 ton air-cooled condensers have an operating range of 40°F to 115°F, with a low ambient option down to 0°F.
The control panel is factory-installed and wired to prevent potential damage and to provide weathertight protection.
The control panel contains:
• fan motor contactors.
• fan cycling controls.
• terminal point connection for compressor interlock.
• 115-volt control power transformer.
These standard features reduce installation costs and provide easy interface with control logic.
All Trane air-cooled condenser coils are an all aluminum Microchannel design. The 20 to 30 ton condensers are single circuit; 40 to 120 ton units are dual circuited; all feature integral subcooling.
Units can have optional corrosion protected condenser coil.

Durable Construction

Trane 20 to 120 ton condensers are built for long life. The unit frame is constructed of 14 gauge galvanized steel. Louvered panels provide excellent coil protection while enhancing unit appearance and strength. The unit surface is phosphatized and finished with Trane Slate Grey air­dry paint. This air dry-paint finish exceeds 500 consecutive hour salt spray resistance in accordance with ASTM B117.

Microchannel Condenser Coils

Microchannel coils are an all aluminum coil that has been successfully used in the automotive industry for many years, and is now being applied in the HVAC industry. The coils have a fully-brazed construction which increases coil rigidity making them more rugged to withstand the rigors of jobsite handling. Additionally, the light weight simplifies coil handling. The all aluminum construction creates an exceptional heat transfer capability, allowing the refrigerant charge to be reduced to levels that exceed LEED EA­Credit 4 requirements. Bottom line, less refrigerant is being used, which creates a healthier and greener environment.
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Application Considerations

Certain application constraints should be considered when sizing, selecting, and installing air­cooled condensers. Unit and system reliability depends on properly and completely acknowledging these considerations. Consult your local Trane sales engineer if your application varies from these guidelines.
Setting the Unit
A base or foundation is not required if the selected unit location is level and strong enough to support the operating weight. Refer to the Weights section for the weight of individual units.
Isolation and Sound Emission
The most effective method of noise isolation is proper unit location. Units should be placed away from noise sensitive areas. Structurally transmitted noise can be reduced with the use of spring isolators and they are recommended for acoustically sensitive applications. Flexible electrical conduit, for maximum isolation effectiveness, will reduce sound transmitted through electrical conduit.
State and local codes on sound emissions should always be considered. Since the environment in which a sound source is located affects sound pressure, unit placement must be carefully evaluated.
Servicing
Recommended minimum space envelopes for servicing are located in the Dimensional Data section and serve as guidelines for providing adequate clearance. The minimum space envelopes also allow for control panel door swing and routine maintenance requirements.
Unit Location
Unobstructed flow of condenser air is essential to maintaining capacity and operating efficiency. When determining unit placement, careful consideration must be given to assure a sufficient flow of air across the condenser heat transfer surface. Two detrimental conditions are possible and must be avoided: Warm air recirculation and coil starvation.
Warm air recirculation occurs when discharge air from the condenser fans is recycled back at the condenser coil inlet. Coil starvation occurs when free airflow to the condenser is restricted.
Both warm air recirculation and coil starvation cause reductions in unit efficiency and capacity because of the higher head pressures associated with them. In more severe cases, nuisance unit shutdowns will result from excessive head pressures.
Cross winds, those perpendicular to the condenser, tend to aid efficient operation in warmer ambient conditions. However, they tend to be detrimental to operation in lower ambients or when hot gas bypass is used due to the accompanying loss of adequate head pressure. As a result, it is advisable to protect air-cooled condensers from continuous direct winds exceeding 10 miles per hour.
Debris, trash, supplies, etc., should not be allowed to accumulate in the vicinity of the air-cooled condenser. Supply air movement may draw debris into the condenser coil, blocking spaces between coil fins and causing coil starvation. Special consideration should be given to low ambient units. Condenser coils and fan discharge must be kept free of snow or other obstructions to permit adequate airflow for satisfactory unit operation.
Clearance
Vertical condenser air discharge must be unobstructed. While it is difficult to predict the degree of warm air recirculation, a unit installed with a ceiling or other obstruction above it will lose capacity and the maximum ambient operation will be reduced. Nuisance high head pressure tripouts may also occur.
The inlet to the coil must also be unobstructed. A unit installed closer than the minimum recommended distance to a wall or other vertical riser may experience a combination of coil
ACDS-PRC003-EN 5
Application Considerations
starvation and warm air recirculation, resulting in unit capacity and efficiency reductions, as well as possible excessive head pressures. The recommended lateral distances are listed in the Dimensional Data section.
Voltage
Nominal voltage is the nameplate rating voltage. The actual range of line voltages at which the equipment can satisfactorily operate is given below:
Table 1. Voltage range
Nominal Voltage Voltage Utilization Range
200/230 180-220 or 208-254
460 416-508
575 520-635
200/230-volt units ship from the factory set for operation in the 180 through 220-volt range. By changing leads on unit transformers, the unit will operate in the 208 through 254-volt range.
Effects of Altitude
The tables in the Performance Data section are for use at sea level. At elevations substantially above sea level, the decreased air density will decrease condenser capacity. Refer to the Performance Adjustment Factors section to correct performance at other altitudes.
Ambient Limitations
Trane condensers are designed for year-around applications in ambients from 0°F through 115°F. For operation below 0 F or above 115 F, contact the local Trane sales office.
Start-up and operation of Trane condensers at lower ambient temperatures require that sufficient head pressure be maintained for proper operation. Minimum operating ambient temperatures for standard unit selections and units with hot gas bypass are shown in the General Data section. These temperatures are based on still conditions (winds not exceeding five mph.) Greater wind velocities will result in a drop in head pressure, therefore, increasing the minimum starting and operating ambient temperatures.
Units with the low ambient option are capable of starting and operating in ambients down to 0°F, 10°F with hot gas bypass. Optional low ambient units use a condenser fan damper arrangement that controls condenser capacity by modulating in response to head pressure.
Maximum cataloged ambient temperature operation of a standard condenser is 115°F. Operation at design ambients above 115°F can result in excessive head pressures. For operation above 115°F, contact the local Trane sales office.
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Model Number Descriptions

20 to 60 Ton Model Nomenclature
Digit 1 — Unit Type
C=Condenser
Digit 2 — Condenser
A = Air-Cooled
Digit 3 — Airflow
U= Upflow
Digit 4 — Development Sequence
J=Third
Digit s 5,6,7 — Nominal Capacity
C20 = 20 Tons C25 = 25 Tons C30 = 30 Tons C40 = 40 Tons C50 = 50 Tons C60 = 60 Tons
Digit 8 — Power Supply
G = 200/230/60/3 XL 4 = 460/60/3 XL 5 = 575/60/3 XL
Digit 9 — Condenser Circuit
1 = Single (20-30 Ton) 2 = Dual (40-60 Ton)
Digit 10 — Design Sequence
* = Factory Assigned
Digit 11 — Ambient Control
0=Standard 1 = 0 F
Digit 12 — Agency Approval
0=None 3=cULus
Digits 13, 14 — Miscellaneous
J = Corrosion Protected Condenser Coil 1 = Spring Isolators 2 = Rubber Isolators
Note: The service digit for each model
number contains 14 digits; all 14 digits must be referenced.
80 to 120 Ton Model Nomenclature
Digit 1 — Unit Type
C=Condenser
Digit 2 — Condenser
A= Air-Cooled
Digit 3 — Airflow
U= Upflow
Digit 4 — Development Sequence
J = Third
Digits 5,6,7 — Nominal Capacity
C80 = 80 Tons D10 = 100 Tons D12 = 120 Tons
Digit 8 — Power Supply
F = 230/60/3 4 = 460/60/3 5 = 575/60/3 E = 200/60/3
Digit 9 — Condenser Circuit
2=Dual Circuit
Digit 10 — Design Sequence
A= First
Digit 11 — Ambient Control
0=Standard 1= 0°F
Digit 12 — Agency Approval
0=None 2=CSA 3=cULus
Digits 13, 14 — Miscellaneous
J = Corrosion Protected Condenser Coil 1 = Spring Isolators
Note: The service digit for each model
number contains 14 digits; all 14 digits must be referenced.
ACDS-PRC003-EN 7

General Data

Table 2. General data
20 Ton 25 Ton 30 Ton 40 Ton 50 Ton 60 Ton 80 Ton 100 Ton 120 Ton
Model Number CAUJC-20 CAUJC-25 CAUJ-C30 CAUJ-C40 CAUJ-C50 CAUJ-C60 CAUJ-C80 CAUJ-D10 CAUJ-D12
Gross Heat Rejection
(a)
(MBh)
Condenser Fan Data
Quantity/Fan Dia. Type 2/26"/Prop 3/26"/Prop 3/26"/Prop 4/26"/Prop 6/26"/Prop 6/26"/Prop 8/26"/Prop 12/26"/Prop 12/26"/Prop
Fan Drive Type Direct Direct Direct Direct Direct Direct Direct Direct Direct
No. of Motors/HP Each 2/1.0 3/1.0 3/1.0 4/1.0 6/1.0 6/1.0 8/1.0 12/1.0 12/1.0
Nominal Total CFM 14600 20700 20700 26790 36890 40490 56490 73890 76280
Condenser Coil Data
Number of Coils/Size (Inches)
2
) 41.4 41.4 41.4 58.2 68.0 85.4 116.4 136 170.7
Size (ft
Rows/Fin per ft 1/276 1/276 1/276 1/240 1/240 1/240 1/240 1/240 1/240
Condenser Storage Capacity (lbs)
Typ e Microchannel
Refrigerant Data
No. Refrigerant Circuits 1 1 1 2 2 2 2 2 2
Refrigerant Type R-410A R-410A R-410A R-410A R-410A R-410A R-410A R-410A R-410A
Refrigerant Operating Charge (Lbs.)
Minimum Outdoor Air Temperature for Mechanical Cooling
Standard Ambient Operating Range (F)
Low Ambient Option (F) 0 0 0 0 0 0 0 0 0
(a) Gross Heat Rejection is at a 30 F ITD (Initial Temperature Difference) between condensing temperature and ambient air entering condenser (includes
the effect of subcooling). (b) At conditions of 95° ambient, condenser is 95 percent full (c) Condensing units are shipping with nitrogen holding charge only. (d) Operating charge is for condensing unit only, and does not include charge for low side or interconnecting lines.
(b)
(c)
(d)
350 402 456 635 819 1002 1269 1639 2004
2/42x71 2/42x71 2/42x71 2/59x71 2/51x96 2/64x96 4/59x71 4/51x96 4/64x96
18.7 18.7 18.7 23.5 25.0 31.5 47.1 50.0 62.9
11.9 11.8 11.8 22.7 23.4 26.4 57.1 59.1 65.3
40-125 40-125 40-125 40-125 40-125 40-125 40-125 40-125 40-125
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Selection Procedures

When manually matching condensers with compressors, performance cross plotting becomes necessary. The following procedure should be used to determine the correct condenser.
1. Determine the total cooling load. Make a prelimary compressor selection based on the expected evaporator SST and condensing temperature.
Example:
Given- Total cooling load = 101 tons (1212 Mbh)
Design outdoor temperature = 95°F
Assume- Evaporator SST = 45°F (used in this example - application dependent)
Condenser SCT between 115°F and 125°F (20-30°F ITD SCT-ambient)
2. Select compressors from manufacturer's data to meet the load at the evaporator SST (for chiller low suction applications contact Trane applications) -
Table 3. Compressor capacity with subcooling
(Qty 2) CSHN611 Trane R-410A Trio Scrolls Performance data includes 15°F subcooling
SST SCT Tons Mbh
45 115 110 1320
45 125 103 1236
Notes:
1. SST = Saturated Suction Temperature
2. SCT = Saturated Condensing Temperature
a. Remove the subcooling effect from the compressor performance at two or more compressor
capacity points. R-410A capacity increases 0.75% for every degree of subcooling (0.75% x 15°F = 11.25%). So if compressor performance is at 15°F subcooling, divide capacity by 1.1125 to get capacity at 0°F subcooling. Plot these two points (SCT vs. compressor tons a 0°F subcooling) as shown in the selection example (Figure 1, p. 11).
Table 4. Compressor capacity with subcooling removed
(Qty 2) CSHN611 Trane R-410A Trio Scrolls
Capacity
15°F subcooling 0°F subcooling
(a)
SST
45 115 110 1320 98.9 1187
45 125 103 1236 92.6 1111
(a) SST = Saturated Suction Temperature (b) SCT = Saturated Condensing Temperature
SCT
(b)
Tons Mbh Tons Mbh
b. Select a condenser from Figure 3, p. 13 (CAUJ-D10 assumed for this example) and read two
condenser only heat rejection points. Divide the condenser heat rejection by the compressor N factor (Table 6, p. 11) to convert from heat rejection to net capacity (Net Tons Less Subcooling). The N factor equals the ratio of compressor heat rejection divided by compressor capacity at 0°F subcooling. Plot these two points (SCT vs. Net Tons at 0°F subcooling) as shown in Figure 1, p. 11 selection example.
ACDS-PRC003-EN 9
Selection Procedures
Table 5. Condenser net capacity Mbh (less subcooling)
Assumed ∆T°F ITD
Notes:
1. ITD = Initial Temperature Difference
2. SCT = Saturated Condensing Temperature
3. N Factor = Compressor Efficiency Ratio
Note: Note that evaporator selection must also meet performance requirements. For this
(SCT - ambient)
20 95 115 938 1.27 739 61.5
30 95 125 1418 1.33 1066 88.8
Ambient,
°F SCT, °F
Cond only heat
rejection, Mbh N factor
Net capacity less subcooling
Mbh Tons
c. As shown on Figure 1, p. 11, draw a line though the points representing the compressor
capacity at 0°F subcooling. Next, draw a line through the points representing condenser net capacity less subcooling.
d. At the point of intersection of the compressor and condenser lines draw dashed lines to the
left and bottom margins as shown in Figure 1, p. 11. The end points of these lines will show a resultant gross capacity of 92 tons at 126.1°F condensing temperature.
e. From Figure 2, p. 12 calculate the percent increase in total heat rejection due to subcooling,
and multiply by the N factor (see Tab le 6 , p . 11 ) to get the percent increase in net capacity due to subcooling.
Example:
At 95°F ambient and 126.1°F condensing temperature Figure 2, p. 12 shows there is a 7. 8 % increase in total heat rejection due to subcooling. Tab l e 6 shows a 1.34 N factor by linear interpolation. This yields a system capacity of 92 tons x (1 + 7. 8 % x 1. 34 ) = 102 tons.
f. If necessary use the values in Table 7, p. 12 to adjust the system capacity for altitude.
g. Compare this result with the design capacity and condensing temperature.
The required cooling load is 101 tons, therefore, the CAUJ-D10 is the proper selection.
Repeat the process steps B through G as necessary to achieve the most economic condenser selection.
example, the evaporator needs to provide at least 105 tons at 45°SST. A conservative estimate for liquid temperature entering the evaporator is the SCT minus the design subcooling (125.1 - 15°F = 110.1°F for the example above). Contact Trane Applications if excessive refrigerant line lengths or pressure drops are required.
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