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Air-Cooled
Liquid Chillers
10 to 60 Tons
April 2004 CG-PRC007-EN
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Introduction Air-Cooled Liquid Chillers Design and manufacturing excellence produce quality products. This tradition makes Trane a leader in the air-cooled of using excellence to meet market chiller marketplace. For over 40 years, demands is illustrated with the Trane 10 Trane has been using the best to 60-ton air-cooled chillers. engineering available in development, manufacturing, and marketing to 10, 15 Tons 20–60 T ons © 2003 American Standard Inc. All rights reserved CG-PRC007-EN
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Contents Introduction 2 Features and Benefits 4 Application Considerations 9 Selection Procedure 14 Model Number Description 15 General Data 16 Performance Data 21 Performance Adjustment Factors 17 Controls 30 Electric Power 37 Dimension and Weights 39 Mechanical Specifications 48 CG-PRC001-EN 3
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(1 0–60 T on) Features and Benefits Installation Packed Stock Increases Project Flexibility Small size, complete factory wiring, easy lifting provisions, factory installed Trane 10 to 60-ton air-cooled chillers options and start-up control provide fast, are available through the most flexible easy installation. A complete factory run packed stock program in the industry. test is performed on each unit, Trane knows you want your units on eliminating potential start-up problems. the jobsite, on t
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(1 0–1 5 T on) Features and Benefits The 10 and 15-ton air-cooled Cold Elapsed Time Meter/Number Starts Optional Features ™ Counter — Records number of Generator chillers, with Trane direct • Hot Gas Bypass — Allows unit drive hermetic scroll compressors, has compressor starts and operating operation below the minimum step of outstanding standard features and hours. unloading. Flow Switch — Required as a safety additional benefits that make selection, Low Ambient Head Pressure Control inst
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Features and (20–60 T on) Benefits Trane’s 20-60 ton chillers offer the same Other Standard Features Optional Features time-tested and proven control Trane 3-D Scroll compressors Controls for ice making operation technology that is applied to the Advanced motor protection IntelliPak Air Cooled rooftops. Miscellaneous Options 300 psi waterside evaporator Superior control makes the IntelliPak a Evaporator insulation (¾-inch Trane Communications Interface truly advanced chiller. Armafle
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Features and (20–60 T on) Benefits Enhanced Controls IntelliPak Chiller Unit Control Module (UCM) Microprocessor Control The brain of the 20 to 60 ton air-cooled chiller is its Unit Control Module (UCM). The UCM is an innovative, modular microprocessor control design, which coordinates the actions of the chiller in an efficient manner, providing stand- alone operation of the unit. Access to the unit controls is via a Human Interface (HI) Panel, a standard component of the IntelliPak chiller. Th
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Features and (20–60 T on) Benefits Proven Design Through Testing and than 400,000 hours of laboratory testing Trane 3-D Scroll Compressor Research and field operation. This work combined Simple Design with 70% Fewer Parts with over 25 patents makes Trane the With over twenty years of development Fewer parts than an equal capacity worldwide leader in air conditioning and testing, Trane 3-D Scroll reciprocating compressor means scroll compressor technology. compressors have undergone more signific
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Application Considerations Certain application constraints should be For maximum isolation effect, water lines Debris, trash, supplies, etc., should not considered when sizing, selecting and and electrical conduit should also be be allowed to accumulate in the vicinity installing T rane air -cooled c hillers. Unit isolated. Wall sleeves and rubber isolated of the air-cooled chiller. Supply air and system reliability is often dependent piping hangers can be used to reduce the movement may draw de
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Application Considerations b d W A TER TREA TMENT Provide V ertical Clearance Provide Sufficient Unit-to-Unit Clearance Dirt, scale, products of corrosion, and other foreign material in the water will Vertical condenser air discharge must be Units should be separated from each adversely affect heat transfer between unobstructed. While it is difficult to other by sufficient distance to prevent the water and system components. predict the degree of warm air warm air recirculation or coil starvatio
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Application Considerations A flow switch used as a safety interlock is AMBIENT LIMITATIONS CONTROLS always recommended for CGA units. 1 Trane chillers are designed for year- The CGAF air-cooled chiller has a system round applications in ambients from 0°F Temperature Controller which senses a loss of flow condition to 115°F. For operation below 0°F or In order to provide stable system and shuts the unit down. A flow switch above 115°F , contact the local Trane sales operation and to prevent exces
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Application Considerations point and adequate ethylene glycol TYPICAL W A TER PIPING MULTIPLE UNIT OPERATION concentration for safe operation. All building water piping must be Whenever two or more units are used The maximum catalog leaving solution flushed prior to making final connections on one chilled water loop, Trane temperature from the evaporator is 65°F to the chiller. To reduce heat loss and recommends that their operation be for outdoor ambients up to 115°F. High prevent condensation,
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Application Considerations 10, 15 Ton Figure AC-1 — Recommended Piping Components For Typical Evaporator Installation Note: Provide shutoff valves in the evaporator inlet and outlet to facilitate water temperature sensor removal. See unit dimensional drawings for inlet and outlet locations. 20–60 T on CG-PRC007-EN 13
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Selection Procedure The chiller capacity tables presented in System Power Input = 70.2 KW 1 the “Performance Data” section cover To calculate the required chilled Unit EER = 9.8 the most frequently encountered leaving waterflow rate we use the formula: MINIMUM LEAVING CHILLED WATER water temperatures. The tables reflect a GPM = Tons x 24 TEMPERATURE SET POINTS 10°F temperature drop through the ∆T evaporator. For temperature drops other The minimum leaving chilled water than 10°F, fouling factor
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Model Number Description 10, 15 Tons CGA 120 B 3 00 B A 123 456 7 8 9,10 11 12 DIGIT 1,2,3 — Unit Type DIGIT 8 — Voltage DIGIT 10 — Leaving Solution Set point ™ CGA = Air-Cooled Cold Generator 1 = 208-230/60/1 0 =Standard Expansion Valve (Available — CGA120 Only) 40-60°F Leaving Water 3 = 208-230/60/3 (CGA100 & CGA120 models) DIGITS 4,5,6 — Nominal Capacity (MBh) 4 = 460/60/3 20-60°F Leaving Solution 100 = 8 Tons (50 Hz Model only) W = 575/60/3 (CGA150 & CG
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General Data Table GD-1 — General Data — 10–60 Ton Units 10 T on 15 T on 20 T on 25 T on 30 T on 40 T on 50 T on 60 T on Model Number CGA120 CGA180 CGAF-C20 CGAF-C25 CGAF-C30 CGAF-C40 CGAF-C50 CGAF-C60 Compressor Data Model Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll Quantity 2 2 2 1/1 2 4 2/2 4 Nominal Tons per Compressor 5 7.5 10 10/15 15 10 10/15 15 Evaporator Nominal Size (Tons) 10 15 20 25 30 40 50 60 ² Water Storage Capacity (Gallons) 1.4 1.5 2.2 2.7 3.2 4.1 5.0 7.4
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Performance Adjustment Factors Table PAF-1— Performance Adjustment Factors (10 & 15 Ton Units Only) Chilled Altitude Fouling Water Sea Level 2,000 Feet 4,000 Feet 6,000 Feet Factor ∆ T CAP GPM KW CAP GPM KW CAP GPM KW CAP GPM KW 6 1.00 1.66 1.00 0.98 1.63 1.01 0.95 1.59 1.02 0.93 1.54 1.05 8 1.00 1.25 1.00 0.98 1.22 1.01 0.96 1.19 1.02 0.93 1.16 1.05 0.00025 10 1.00 1.00 1.00 0.98 0.98 1.01 0.95 0.95 1.02 0.92 0.92 1.04 12 1.00 0.83 1.00 0.98 0.81 1.01 0.95 0.79 1.02 0.92 0.77 1.04 14 0.99 0.71
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Performance Adjustment Factors Chart PAF-1 — Evaporator Water Pressure Drop 10 to 60 Ton Air-Cooled Chillers Flow (L/S) 40 30 20 10 9 8 7 6 5 4 3 2 1 1 10 10 10 20 30 40 50 60 70 80 90 100 100 200 300 Flow (GPM) 18 CG-PRC007-EN 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6. 5 7 7.5 8 8.5 9 9.5 1 1 10 0 0 15 40 Ton 30 Ton 50 Ton 60 Ton 20 & 25 Ton 10 Ton 15 Ton Pressure Drop (Ft of Water)
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Performance Adjustment Factors Chart PAF-2— Ethylene Glycol Performance Factors Chart PAF-3— Propylene Glycol Performance Factors CG-PRC007-EN 19
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Performance Adjustment Factors Chart PAF-4— Ethylene Glycol and Propylene Glycol Performance Factors 20 CG-PRC007-EN
