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Summary of Contents for Trane RTAA-70
- Page 1 Installation Operation Maintenance ® Series R Air-Cooled Rotary Liquid Chillers Packaged Air-Cooled Chiller, RTAA 70-125 Remote Evaporator Air-Cooled Chiller, RTAA 70-125 Models RTAA RTAA-70 RTAA-100 RTAA-80 RTAA-110 RTAA-90 RTAA-125 RTAA-SVX01A-EN September 2005 © American Standard Inc. 2005...
- Page 2 Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants—including industry replacements for CFCs such as and HCFCs and HFCs.
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Page 3: Table Of Contents
Table of Contents General Information ........5 Unit Identification - Nameplates . -
Page 4: Table Of Contents
Table of Contents DIP Switch Settings ......... 100 IPC Address . -
Page 5: General Information
General Information Unit Identification - Nameplates When the unit arrives, compare all nameplate data with ordering, submittal, and shipping information. A typical unit nameplate is shown in Figure Figure 1 Standatd Unit Nameplate Figure 2 Pump Package Unit Nameplate Nameplates The RTAA outdoor unit nameplates are applied to the exterior of the Control Panel. -
Page 6: Unit Inspection
Request an immediate, joint inspection of the damage with the car- rier and the consignee. • Notify the Trane sales representative and arrange for repair. Do not repair the unit, however, until damage is inspected by the transportation repre- sentative. -
Page 7: Unit Description
The units are factory charged with refrigerant and oil. The RTAA series features Trane's exclusive Adaptive Control™ logic with Clear Language Display. It monitors the control variables that govern the operation of the chiller unit. Adaptive Control logic can adjust these variables, when necessary, to optimize operational efficiencies, avoid chiller shutdown, and keep producing chilled water. - Page 8 1. Data containing information on two circuits shown as follows: ckt1/ckt2 2. Minimum start-up/operating ambient based on a 5 mph wind across the condenser. 3. Percent minimum load is for total machine, not each individual circuit. 4. Trane Part Change # Oil-31 (see service bulletin SCOM-SB-1) RTAA-SVX01A-EN...
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Page 9: Model Number Coding System
General Information Model Number Coding System The model number for the unit is comprised of numbers and letters which represent features of the equipment. Shown on the chart in Figure 3 samples of typical unit model numbers, followed by the coding system. Each position, or group of positions, in the number is used to represent a feature. -
Page 10: Installation — Mechanical
Trane sales office. Close the discharge and liquid line isolation valves. Location Requirements Noise Considerations • Refer to Trane Engineering Bulletins for application information on RTAA chillers. • Locate the outdoor unit away from sound-sensitive areas. •... -
Page 11: Foundation
Once in place, the outdoor unit must be level within 1/4” (6.4 mm) over its length and width. The Trane Company is not responsible for equipment problems resulting from an improperly designed or constructed foundation. RTAA-SVX01A-EN... - Page 12 Installation — Mechanical Figure 4 RTAA Rigging and Lifting Weights – Packaged Unit RTAA-SVX01A-EN...
- Page 13 Installation — Mechanical Figure 5 RTAA Rigging and Lifting Weights – Remote Evaporator RTAA-SVX01A-EN...
- Page 14 Installation — Mechanical Figure 6 RTAA Rigging and Lifting Weights –Pump Package Aluminum Fins RTAA-SVX01A-EN...
- Page 15 Installation — Mechanical Figure 7 RTAA Rigging and Lifting Weights –Pump Package Copper Fins RTAA-SVX01A-EN...
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Page 16: Clearances
NOTE: If the outdoor unit configuration requires a variance to the clearance dimensions, contact your Trane Sales Office Representative. Also refer to Trane Engineering Bulletins for application information on RTAA chillers. Additional Location Requirements for Remote Evaporator Only The Remote evaporator must be installed in a conditioned space, unless: •... - Page 17 Installation — Mechanical Lifting Procedure CAUTION Equipment Damage! To prevent damage do not use a forklift to lift or push the unit. Position lifting beam so that cables do not contact the unit. • Install chains and safety chains through the six lifting plates provided on the unit.
- Page 18 Installation — Mechanical Figure 8 Dimensions and Clearances for RTAA Packaged Unit 70 – 125 Tons RTAA-SVX01A-EN...
- Page 19 Installation — Mechanical Figure 9 Dimensions and Clearances for RTAA with Remote Evaporator 70 – 125 Tons RTAA-SVX01A-EN...
- Page 20 Installation — Mechanical Figure 10 Remote Evaporator Dimensions, RTAA 70 – 125 Tons RTAA-SVX01A-EN...
- Page 21 Installation — Mechanical Figure 11 Remote Evaporator Dimensions, RTAA 110 – 125 Tons RTAA-SVX01A-EN...
- Page 22 Installation — Mechanical Figure 12 Dimensions and Clearances for RTAA with Pump Package 70 – 125 Tons RTAA-SVX01A-EN...
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Page 23: Unit Isolation
Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water. - Page 24 Installation — Mechanical Figure 13 Isolator Placement for Typical RTAA Packaged Unit 70 – 125 Tons RTAA-SVX01A-EN...
- Page 25 Installation — Mechanical Figure 14 Isolator Placement for RTAA with Remote Evaporator RTAA-SVX01A-EN...
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Page 26: Evaporator Water Piping
Installation — Mechanical Evaporator Water Piping Figure 15 illustrates typical evaporator piping components. Components and layout will vary slightly, depending on the location of connections and the water source. CAUTION Evaporator Damage! The chilled water connections to the evaporator are to be “victualic”... -
Page 27: Evaporator Piping Components
Installation — Mechanical Figure 15 Suggested Piping for Typical RTAA Evaporator Evaporator Piping Components “Piping components” include all devices and controls used to provide proper water system operation and unit safety. These components and their general locations are given below. Entering Chilled Water Piping •... -
Page 28: Evaporator Drain
Installation — Mechanical CAUTION Evaporator Damage! To prevent evaporator damage, do not exceed 215 psig (14.6 bar) evaporator water pressure. Evaporator Drain A 3/4” drain connection is located under the outlet end of the evaporator. This may be connected to a suitable drain to permit evaporator drainage during unit servicing. - Page 29 The services of a qualified water treatment specialist should be engaged to determine what treatment, if any, is advisable. The Trane Company warranty specifically excludes liability for corrosion, erosion or deterioration of Trane equipment. Trane assumes no responsibilities for the results of the use of untreated or improperly treated water, or saline or brackish water.
- Page 30 Installation — Mechanical Water Pressure Relief Valves Install a water pressure relief valve in the evaporator inlet piping between the evaporator and the inlet shutoff valve, as shown in Figure 15. Water vessels with close-coupled shutoff valves have a high potential for hydrostatic pressure buildup on a water temperature increase.
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Page 31: Installation — Remote Evaporator
Installation — Remote Evaporator The RTAA outdoor unit with the remote evaporator option is shipped as two pieces: the outdoor unit (condenser) and the evaporator. Short suction line connections are provided with the outdoor condensing unit. The liquid line connections are at the end opposite the control panel. The remote evaporator is shipped complete with factory-mounted refrigeration specialties (electronic expansion valves, sight-glasses and removable core filter-dryers). - Page 32 Installation — Remote Evaporator Figure 17 Remote Evaporator Installation No Elevation Difference, Rise of Suction and Liquid Lines not to exceed 20 inches or Less Figure 18 Remote Evaporator Installation No Elevation Difference, Rise of Suction and Liquid Lines no to exceed 15 feet or Less (Suction accumulator may be required) RTAA-SVX01A-EN...
- Page 33 Installation — Remote Evaporator Figure 19 Remote Evaporator Installation Condensing Unit Above Evaporator – 100 Feet or Less Figure 20 Remote Evaporator Installation Condensing Unit Below Evaporator – 15 Feet or Less (Suction accumulator may be required) RTAA-SVX01A-EN...
- Page 34 Installation — Remote Evaporator 1. The remote evaporator MUST be matched with its respective outdoor condensing unit. 2. The circuit number on the outdoor condensing unit must match the circuit number on the evaporator, i.e. circuit #1 on the outdoor condensing unit must be connected with circuit # 1 on the remote evaporator and likewise for circuit # 2.
- Page 35 Installation — Remote Evaporator Table 2 RTAA Circuit Capacities (nominal tons) Model Circuit 1 Circuit 2 Table 3 Equivalent Lengths of Non-Ferrous Valves and Fittings (feet) Line Size Globe Short Angle Short Radius Long Radius Inches OD Valve Valve 1-1/8 1-3/8 1-5/8 2-1/8...
- Page 36 Installation — Remote Evaporator Table 4 Liquid Line Sizes 35 Ton Circuit 40 Ton Circuit Liquid Line Size (OD”) Liquid Line Size (OD”) Total Total Equiv. Horizontal Equiv. Horizontal Length Upflow Upflow Upflow Length Upflow Upflow Upflow (ft.) Downflow 1-5 ft. 6-10 ft.
- Page 37 Installation — Remote Evaporator Table 6 Suction Line Sizes (“O.D.”) for Horizontal and/or Downflow Lines Circuit Size: Total Equiv. Length (ft.) 35 Ton 40 Ton 50 Ton 60 Ton 2.125 2.125 2.625 2.625 2.125 2.125 2.625 2.625 2.125 2.125 2.625 2.625 2.125 2.625...
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Page 38: Line Sizing
Installation — Remote Evaporator Line Sizing To determine the appropriate outside diameter for field installed liquid and suction lines, it is first necessary to establish the equivalent length of pipe for each line. It is also necessary to know the capacity (tons) of each circuit. Circuit capacities for each RTAA unit are listed in Table Liquid Line Sizing Steps... -
Page 39: Example Liquid Line Sizing
Installation — Remote Evaporator Table 7 Additional Suction Accumulator Line Required Length in Feet of Field Installed Suction Line Accumulator 35 Ton Circuit 40 Ton Circuit 50 Ton Circuit 60 Ton Circuit Liquid Line 2 1/8" O.D. 2 5/8" O.D. 2 1/8"... -
Page 40: Suction Line Sizing Steps
Installation — Remote Evaporator 9. From Table 4, for a 50 ton circuit, for 125 equivalent feet (also nearest to 128.2 feet), the OD is still: Horizontal or Downflow = 1 1/8 inches 10. From 22, there is 8 feet of up-flow on the liquid line inverted trap. There- fore, select: Upflow = 1-3/8 inches Figure 22... - Page 41 Installation — Remote Evaporator column find the outside diameter that corresponds to the equivalent length computed in step #6. 8. Use Table 3 and the diameter found in step #7 to determine the equiva- lent lengths of each fitting. 9. Sum the following: equivalent lengths of the fittings from step #8, the actual length of the horizontal or downflow suction line, and the equiva- lent length of the upflow line found in step # 4.
- Page 42 Installation — Remote Evaporator Suction Accumulator Sizing Installations similar to those in Figure 18 will require that the suction accumulator be extended at least by the amount shown in 7. The suction accumulator length in feet is dependent upon: circuit tonnage, suction line O.D., and actual liquid line length.
- Page 43 Installation — Remote Evaporator Figure 23 Suction Accumulator Sizing Example RTAA-SVX01A-EN...
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Page 44: Piping Installation Procedures
Installation — Remote Evaporator Piping Installation Procedures The outdoor unit and the evaporator are shipped with a 25 psig holding pressure of dry nitrogen. Do not relieve this pressure until field installation of the refrigerant piping is to be accomplished. This will require the removal of the temporary pipe caps. - Page 45 Installation — Remote Evaporator Figure 24 Refrigerant Sensor Mounting and Wiring RTAA-SVX01A-EN...
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Page 46: Leak Test And Evacuation
Installation — Remote Evaporator Leak Test and Evacuation After installation of the refrigerant piping, thoroughly test the system for leaks. Pressure test the system at pressures required by local codes. Immediately before evacuation, install the liquid line filter cores. These will be shipped with the evaporator. -
Page 47: Relief Valve Venting
Use the following formula to calculate the amount of oil to be added: Pints of Oil (Trane Oil-31) = lbs of refrigerant added for field-installed piping From the example above, in which the weight of the additional refrigerant added for the field-installed piping was 34.0 lbs (30.6 + 3.4), the amount of oil... - Page 48 Installation — Remote Evaporator The relief valves are 3/8” SAE flare connections. They have a 300 psig relief setpoint, and relieve at 10.21 lba/min. The connection size and locations are shown in the chiller's submittals. Refer to local codes for relief valve vent line sizing information.
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Page 49: Installation — Electrical
For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with an appropriate voltmeter that all capacitors have discharged. - Page 50 Installation — Electrical Table 10 Electrical Data Unit Wiring Motor Data Rec Time Rotated Delay or Compressor Fans (Ea) Control Unit Size Voltage MCA (2) MOP (1) RDE (3) Qty. (Ea) RLA (4) LRA (7) Qty. KW (6) RTAA 70 200/60 115/115 800/800...
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Page 51: Installer-Supplied Components
Installation — Electrical Table 11 Electrical Data - Pump Package Option Unit Wiring Motor Data Rec Time Fans Rotated Pump Pump Delay or Comp(Ea) (Ea) Control Unit Size Voltage MCA (2) MOP (1) RDE (3) RLA (4) LRA (7) Qty KW FLA KW (6) RTAA 70... -
Page 52: Power Supply Wiring
Installation — Electrical Power Supply Wiring All power supply wiring must be sized and selected accordingly by the project engineer in accordance with the National Electrical Code. All wiring must comply with local codes and the National Electrical Code. The installing (or electrical) contractor must provide and install the system inter- connecting wiring, as well as the power supply wiring. - Page 53 Installation — Electrical minute. This will allow the compressor to be totally unloaded for the next start-up. If only the proof of chilled water flow interlock is used, the chiller will shut down on an immediate (non-friendly) shutdown and initiate an automatic reset diagnostic.
- Page 54 Installation — Electrical Alarm/Running/Maximum Capacity Outputs Terminals 1 to 7 on terminal strip TB4 of the 1U1 board provide a variety of contact outputs. These are dependent upon the setting of Programmable Relay Setup (“Service Setting Menu”) and its relationship to diagnostics, compressors operating and the system operating at full capacity.
- Page 55 Installation — Electrical Figure 26 Alarm/Running/Maximum Capacity Contact Outputs Table 13 Alarm/Running/Maximum Capacity Menu Settings Diagnostics that the Alarm Programmable Relay(s) is Active Relay Setup Relays Output Setting (Service Configuration MMR/ MAR/ Setting Menu) (Table CMR diag. CAR diag. Notes: MMR = Machine Manual Reset CMR = Circuit Manual Reset MAR = Machine Auto Reset...
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Page 56: Low Voltage Wiring
Installation — Electrical Low Voltage Wiring The remote devices described below require low voltage wiring. All wiring to and from these remote input devices to the UCM must be made with shielded, twisted-pair conductors. Be sure to ground the shielding only at the Clear Language Display. - Page 57 Installation — Electrical reentered until the unit has been switched out of ice-building mode (open 5K20 contacts) and then switched back into ice building mode (close 5K20 contacts). In ice-building, the current setpoint will be set at 120%. For example, if the Front Panel or External Current Limit setpoint is set to 80%, in ice-building the Active Current Limit is 120%.
- Page 58 Installation — Electrical 2. Isolated 2-10 VDC Voltage Source Input. Set DIP Switch SW1-1 of Options Module 1U2 to “OFF” . Connect the voltage source to terminals TB1-4 (+) and TB1-5 (-) on Options Module IU2. CWS is now based on the following equation: CW Setpoint °F = (VDC x 125) - 16.25 Sample values for CWS vs.
- Page 59 Installation — Electrical External Current Limit Setpoint (CLS) This option allows the external setting of the Current Limit Setpoint, independent of the Front Panel Current Limit Setpoint, by one of three means: 1. A remote resistor/potentiometer input (fixed or adjustable). 2.
- Page 60 Installation — Electrical Table 15 Input Values Vs. External Current Limit Setpoint Inputs Resulting Chilled Resistance (Ohms) Current (ma) Voltage (Vdc) Water Setpoint (%RLA) 49000 29000 19000 13000 10.0 9000 12.0 6143 14.0 7 .0 4010 16.0 2333 18.0 1000 20.0 10.0 2.
- Page 61 6. For unit ICS address selection, see ICS Address (Service Settings Menu). LonTalk Communication Interface (LCI-C) The Tracer LCI-C interface acts as a translator between Trane's IPC (Inter- Processor Communication) and Echelon's LonTalk® communications protocol (ANSI/EIA/CEA 709.1). This allows the chiller to communicate with building automation systems which also communicate using the LonTalk®...
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Page 62: Remote Clear Language Display Installation Procedure
Installation — Electrical Remote Clear Language Display Installation Procedure The Remote CLD is intended for indoor use and is not weatherproof. It is mounted in a molded-plastic display box with a molded rubber keypad. Although this is not the same as the membrane keypad of the unit's CLD, the key locations and labels are identical. - Page 63 Installation — Electrical The microprocessing board can now be replaced in the display box with its four attaching screws. Figure 29 Remote CLD Panel Mounting Holes and Electrical Access Knockouts Remote CLD Panel Wiring The Remote CLD requires a 24 VAC power source and a shielded, twisted- pair wire between the panel and the Clear Language Display.
- Page 64 Installation — Electrical Figure 30 Shielded, Twisted Pair Communication LInk at the Remote CLD Panel Connect the 24 VAC power supply to terminals J2A and J2B in the Remote CLD panel. The polarity of the power source is not a concern, but the power source must be grounded to terminal J2Gnd.
- Page 65 Installation — Electrical Figure 31 Remote Display Panel Interconnecting Wiring RTAA-SVX01A-EN...
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Page 66: Operating Principles
Operating Principles This section describes the mechanical operating principles of Series R air-cooled chillers equipped with microcomputer-based control systems. The 70 - 125-ton Model RTAA units are dual-compressor, helical-rotary type air-cooled liquid chillers. The basic components of an RTAA unit are: •... - Page 67 Operating Principles Figure 32 RTAA Refrigeration System and Control Components 1. Discharge Service Valve 9. Subcooler 17. Saturated Evaporator Rfgt. Temp. Sensor 2. Oil Separator 10. Low Pressure Switch 18. Relief Valve 3. 1/4" Angle Valve 11. Liquid Line Service Valve 19.
- Page 68 Operating Principles Compressor Rotors The compressor is a semi-hermetic, direct-drive helical rotary type compressor. Each compressor has two rotors - “male” and “female” - which provide compression. See Figure 33 The male rotor is attached to, and driven by, the motor, and the female rotor is, in turn, driven by the male rotor. Separately housed bearing sets are provided at each end of both rotors.
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Page 69: Oil System Operation
Operating Principles Compressor load capacity is determined by the positions of the unloader valves. They divert refrigerant gas from the rotors to the compressor suction, thus unloading the compressor. This varies the compressor capacity to match the load and reduces the KW draw of the compressor motor. The two-position female unloader will fully open or fully close a port on the rotor housing, at the discharge end of the female rotor. - Page 70 Operating Principles Compressor Bearing Oil Supply Oil is injected into the bearing housings located at each end of both the male and female rotors. Each bearing housing is vented to compressor suction, so that oil leaving the bearings returns through the compressor rotors to the oil separator.
- Page 71 Operating Principles psid and 349 psid. The UCM will allow the unit to remain on-line if there is no increase in pressure for a one hour period. Otherwise, the unit will trip off-line and display the “High Differential Pressure” diagnostic. Figure 34 Fan State at Circuit Startup RTAA-SVX01A-EN...
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Page 72: Controls Interface
Controls Interface The exclusive Trane Adaptive Control logic with the Clear Language Display is comprised of a system of individual modules located in the control panel. The system consists of six different microprocessor-based components. The processors are: • Clear Language Display - 1U6. - Page 73 Controls Interface Figure 35 Operator Interface Adaptive Control Select Report Group This group of four keys allows the operator to select and view the following reports: • Custom Report. • Chiller Report. • Refrigerant Report. • Compressor Report. The Custom Report is the only report of the four that is defined by the operator.
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Page 74: Select Report Group And Select Settings Group Flowcharts
Controls Interface The Next key and Previous key allow the operator to scroll up and down through the display items listed under the report menus. When the last item of a report is displayed and the Next key is pressed, the display will wrap around to the header of the report. - Page 75 Controls Interface Press Chiller Report to display the header Press Next to display MODE: OPERATING MODE] REQUESTED SETPOINT SOURCE: [SETPT SOURCE] Press Next to display COMPRESSOR ON CIRCUITS LOCKED OUT Press Next to display ACTIVE ICE TERMINATION SETPOINT ACTIVE CHILLED WATER SETPOINT The UCM will determine which screen will be displayed after looking at the current Operating Mode.
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Page 93: Diagnostics
Controls Interface Diagnostics If there are no diagnostic messages, the selected menu item will be displayed continuously. If the Diagnostics key is pressed and there are no active diagnostics, the readout on the display will be NO ACTIVE DIAGNOSTICS PRESENT When a system malfunction occurs, one of the following appropriate diagnostic messages will be displayed: ***A MACHINE SHUTDOWN HAS OCCURRED!***... -
Page 94: Operational Features
Controls Interface Operational Features Entering Evaporator Water Temperature When one or both compressors are running, the UCM continually monitors and compares the entering and leaving evaporator water temperatures. If the temperature of the entering water drops more than 2 F below the leaving water temperature for more than 100 degree F seconds, the UCM uses this to indicate a loss of water flow through the evaporator. - Page 95 Controls Interface Current Overload Protection The UCM continually monitors compressor current to provide unit protection in the event of an overcurrent or locked rotor condition. Protection is based on the phase with the highest current and, if limits are exceeded, the UCM will shutdown the compressor and will display an MMR diagnostic.
- Page 96 Controls Interface The equations for each type of reset are: RETURN WATER TEMPERATURE RESET CWS' = CWS + RESET RATIO [START RESET - (TWE - TWL)] and CWS' > or = CWS and CWS' - CWS < or = MAXIMUM RESET OUTDOOR AIR TEMPERATURE RESET CWS' = CWS + RESET RATIO [START RESET - TOD]...
- Page 97 Controls Interface Leaving Water Temperature Cutout This temperature cutout provides protection against freezing caused by low leaving water temperature. The setpoint is both factory set and adjustable from the Service Settings Menu. Temperatures below the setpoint will cause the UCM to accelerate reduction of chiller capacity, even to the point of compressor shutdown.
- Page 98 Controls Interface Table 17 Leaving Fluid Temperature Setpoints The leaving chilled water temperature is not the same as the ice termination setpoint. The ice termination setpoint is based on entering chilled water temperature. Therefore, the ice termination setpoint, minus temperature drop across the evaporator while in the ice making mode, equals the leaving chilled water temperature.
- Page 99 Controls Interface Low Refrigerant Temperature Cutout and Low Pressure Cutout Retry If the LRTC or LPC trips despite the low ambient temperature start logic, the circuit will be permitted to shutdown and retry one time. If the LRTC or LPC trips within the first 20 minutes after initial start but after the low ambient ignore time (grace period), the compressor stops immedi- ately and the Restart Inhibit timer is set to one minute.
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Page 100: Dip Switch Settings
Controls Interface ----------------------------- - = phase with greatest difference from lave (without regard to sign) If Phase Unbalanced Protection (Service Settings Menu) is enabled, and the average three phase current is greater than 80% RLA, and the percent of imbalance is calculated to exceed 15%, the UCM will shutdown the compressor and display a CMR diagnostic. - Page 101 Controls Interface Table 18 Compressor Overload DIP Switch Settings Primary Turns Current Compressor Through Current Transformer Overload Setting Dip Tons Volts/Hz Transformer Extension* Sw/Decimal12345** 200/60 01011/11 230/60 11111/31 346/50 01100/12 380/60 10000/16 400/50 00000/0 460/60 00000/0 575/60 01111/15 200/60 11011/27 230/60 10001/17 346/50...
- Page 102 Controls Interface Mechanical Control Settings The settings for the High Pressure switch, Oil Pressure switch, and Winding Thermostat are shown below: CLOSE OPEN Compressor Discharge High Pressure 300 ±20 405 ±7 Switch – PSIG Compressor Motor Winding Thermostat – F Low Pressure Cutout 22 ±4 7 ±4...
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Page 103: Pre-Start Checkout
For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with an appropriate voltmeter that all capacitors have discharged. - Page 104 Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water.
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Page 105: Unit Voltage Power Supply
Pre-Start Checkout Unit Voltage Power Supply WARNING Live Electrical Components! During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. -
Page 106: Unit Voltage Phasing
Pre-Start Checkout Unit Voltage Phasing It is important that proper rotation of the compressors be established before the unit is started. Proper motor rotation requires confirmation of the electrical phase sequence of the power supply. The motor is internally connected for clockwise rotation with the incoming power supply phased A, B, C. -
Page 107: Water System Flow Rates
Pre-Start Checkout CAUTION Compressor Damage! Do not interchange any load leads that are from the unit contactors or the motor terminals. Reopen the unit disconnect and disconnect the phase indicator. Water System Flow Rates Establish a balanced chilled water flow through the evaporator. The flow rates should fall between the minimum and maximum values given in Table 1. -
Page 108: Start-Up Procedures
Start-Up Procedures If the pre-start checkout, as discussed above, has been completed, the unit is ready to start. The Clear Language Display is shown in Figure 35 and Clear Language Display Sequence of Operation is shown in Figure 1. Complete each step, in sequence, as follows: •... - Page 109 Start-Up Procedures refrigerant charge or excessive pressure drop in the liquid line. A restriction in the line can sometimes be identified by a noticeable temperature differential between the two sides of the restriction. Frost may form on the line at this point. Proper refrigerant charges are shown in Table CAUTION Equipment Check!
- Page 110 Start-Up Procedures Figure 37 Unit Sequence of Operation RTAA-SVX01A-EN...
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Page 111: System Superheat
Start-Up Procedures • A shortage of refrigerant is indicated if operating pressures are low and subcooling is also low. If the operating pressures, sight glass, superheat and subcooling readings indicate a refrigerant shortage, gas-charge refrigerant into each circuit, as required. With the unit running, add refrigerant vapor by connecting the charging line to the suction service valve and charging through the backseat port until operating conditions become normal. -
Page 112: Unit Shutdown Procedures
Unit Shutdown Procedures Temporary Shutdown and Restart To shut the unit down for a short time, use the following procedure: 1. Press the Stop key on the Clear Language Display. The compressors will continue to operate and, after unloading for 20 seconds, will stop when the compressor contactors de-energize. -
Page 113: System Restart After Extended Shutdown
Unit Shutdown Procedures CAUTION Accidental Start-up Damage! Lock the disconnects on the “OPEN” position to prevent accidental start-up and damage to the system when it has been setup for extended shutdown. 5. At least every three months (quarterly), check the pressure in the unit to verify that the refrigerant charge is intact. - Page 114 Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water.
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Page 115: Periodic Maintenance
Periodic Maintenance Perform all maintenance procedures and inspections at the recommended intervals. This will prolong the life of the equipment and minimize the possi- bility of costly failures. Use an “Operator's Log”to record an operating history for the unit. The log serves as a valuable diagnostic tool for service personnel. -
Page 116: Annual Maintenance
Periodic Maintenance • Manually rotate condenser fans to insure proper clearance on the fan openings. Annual Maintenance • Perform all weekly and monthly maintenance procedures. • Check the oil level and refrigerant charge. Refer to “Maintenance Proce- dures” . Routine changing of oil is not required. See Oil Separator Level Check in the Maintenance section of this manual. - Page 117 Periodic Maintenance RTAA Operator's Log Job Name: Job Location: Unit Serial Number: Elevation Above Sea Level: Model No: Nameplate Voltage: Compressor A Serial Number: Fan Motor RLA Compressor A Model Number: Heat Tape Voltage Compressor B Serial Number: Compressor B Model Number: Evap Water Pressure Drop Design PSID: Actual PSID:...
- Page 118 Periodic Maintenance RTAA Log Operator Settings: Set Point Source Low Wtr Temp EXV Gain Comp [D/E] Front Panel Chilled Wtr Setpt Condenser Limit Setpt External Chilled Wtr Setpt [D/E] Phase Unbalance Protection [D/E] Design Delta Temp Setpt Phase Reversal Protection [D/E] Differential To Start Setpt Superheat Setpt Chilled Water Pump [On/Auto]...
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Page 119: Maintenance
To clean the coils, use a soft brush and a sprayer, either a garden, pump-up type or a high-pressure type. A high-quality detergent, such as “Trane Coil Cleaner, CHM-0002” is recommended for standard and Copper coils. -
Page 120: Chemically Cleaning The Evaporator
Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water. -
Page 121: Oil Filter Change
Maintenance 4. After the level has been determined, remove the sight glass and hoses. Figure 39 System Oil Level Specifications Oil Filter Change NOTE: Routine changing of the oil or the oil filter is not recommended. The oil filter is oversized for this application and should not require replacement. The oil and filter should be replaced only if analysis reveals that the oil is contaminated. - Page 122 Maintenance 5. Remove the seven bolts on the oil filter cover. A pan may be necessary to catch any oil that is released after the cover is loosened. NOTE: Observe the placement of copper gasket under one bolt head. 6. Remove the cover and oil filter element.Install the new filter element. Coat the new cover gasket with refrigerant oil.
- Page 123 Maintenance Figure 40 Oil Filter Change RTAA-SVX01A-EN...
- Page 124 Maintenance 35 & 40 Ton Compressor Oil Filter Replacement Chart Normal Pressur Drop Maximum Pressure Drop Condensing Pressure - Suction Pressure (PSID) 50 & 60 Ton Compressor Oil Filter Replacement Chart Normal Pressur Drop Maximum Pressure Drop Condensing Pressure - Suction Pressure (PSID) Figure 41 Oil Pressure Drop RTAA-SVX01A-EN...
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Page 125: Refrigerant Charging And Recovery
Refrigerant Charging and Recovery If the refrigerant charge needs to be adjusted, be certain to monitor the subcooling and superheat measurements. The subcooling needs to be between 10 F and 20 F when the unit is running fully loaded. The ambient temperature is between 75 F and 100 F and the leaving water temperature is between 40 F and 55 F . -
Page 126: High Side Repair
Refrigerant Charging and Recovery 10. Open all valves, start the unit and verify the refrigerant charge by measuring the subcooling. High Side Repair If the refrigerant needs to be isolated in the low side of the unit, perform the following procedures: 1. - Page 127 Diagnostics In the table below, a latching diagnostic is a condition which shall cause the machine or a portion of the machine as noted to shut down and shall require a manual reset to restore operation. A diagnostic that is non-latching shall reset automatically when the condition causing the diagnostic goes away.
- Page 128 Diagnostics Table 19 Diagnostic Codes Diagnostic Description Type Cause Contactor CPRSR A Welded cprsr contactor. Detected a welded compressor contactor when the compressor was commanded off but the current does not go to zero. Detection time shall be 5 second minimum and 10 seconds maximum.
- Page 129 Diagnostics Table 19 Diagnostic Codes Diagnostic Description Type Cause External Chilled Water Setpoint Not “Enabled”: no diagnostics. “Enabled”: Out-Of-Range Low, set diagnostic. Out-Of-Range Hi, no diagnostic. External Current Limit Setpoint Not “Enabled”: no diagnostics. “Enabled”: Out-Of -Range Low, set diagnostic. Out-Of -Range Hi, no diagnostic.
- Page 130 Diagnostics Table 19 Diagnostic Codes Diagnostic Description Type Cause Low Oil Flow - Cprsr A The differential oil pressure switch remained opened for more than 20 contiguous seconds on Cprsr A. Note: Although GP cmprs do not have pressure switch or Oil Line solenoid, this diagnostic is still active.
- Page 131 Diagnostics Table 19 Diagnostic Codes Diagnostic Description Type Cause Oil System Fault - Ckt 1 Entering Oil Temp on either compressor of the given circuit reads a temperature x degrees below the given ckts' saturated condenser temperature for more than 30 minutes where x is the Oil Loss Differential Setpoint (2 degree F hysterisis to clear timer).
- Page 132 Diagnostics Table 19 Diagnostic Codes Diagnostic Description Type Cause Phase Unbalance - Cprsr D Same as Diagnostic for Cprsr A. Power Loss - Cprsr A The Cprsr was running and all three phases of current were lost. There was an open Transition input after transition had been previously proven to have been complete.
- Page 133 Diagnostics Table 19 Diagnostic Codes Diagnostic Description Type Cause Tracer Communications Loss While the chiller switch was in AUTO/REMOTE the communications between the CSR and the connected remote device, e.g., a Tracer or Remote Display, had either never been established for more than 15 minutes after power up or had been lost for more than 15 minutes after it had been established;...
- Page 134 Diagnostics Table 19 Diagnostic Codes Diagnostic Description Type Cause Winding Temp - Cprsr B Same as Diagnostic for Cprsr A, above. Winding Temp - Cprsr C Same as Diagnostic for Cprsr A, above. Winding Temp - Cprsr D Same as Diagnostic for Cprsr A, above. Zone Temp Sensor (Zone Reset Selected) Open or Short.
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Page 135: Pump Package
Pump Package The Canariis Pumping System is completely assembled and consists of two centrifugal pumps, butterfly isolation valves, check valves, y-stainer, multi- purpose valve, controls and piping designed to maintain a suitable water pressure over a widely varying flow range. Maintenance, once the system is properly installed is minimal. -
Page 136: Control Panel Features And Options
Pump Package Control Panel Features and Options 1. NEMA 3R Control Panel Enclosure 2. Individual Fused Disconnect Switches 3. Each A/C motor starter is a full voltage, non-reversing magnetic starter and is provided with adjustable 3-leg overload protection with manual overload reset push button. -
Page 137: Pump Checkout Procedure
Pump Package WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury. 1. -
Page 138: System Start-Up
Pump Package Caution Pump Damage! Do not run the pumps without water in the system. Damage to the pump seal will result if the pump is run dry for more for more than a few seconds. 3. Confirm all H/O/A Switches are in the "Off" position. Turn control power (On / Off) switch to "On". - Page 139 Pump Package C - 2X3X7 1750 R.P.M. Impellers are trimmed in " incre- ments to supply required capacity. 1750 R.P.M. Responsibility for final impeller siz- ing remains with ITT Bell & Gossett. CAPACITY IN U.S. GALLONS PER MINUTE CAPACITY IN CUBIC METERS/HR Figure 42 C - Pump Curves Before Impeller Trim D - 2X3X9...
- Page 140 Pump Package E - 2.5X3X7 1750 R.P.M. Impellers are trimmed in " incre- ments to supply required capacity. 1750 R.P.M. Responsibility for final impeller siz- ing remains with ITT Bell & Gossett. CAPACITY IN U.S. GALLONS PER MINUTE CAPACITY IN CUBIC METERS/HR Figure 44 E - Pump Curves Before Impeller Trim F - 2.5X3X9...
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Page 141: Planned Shutdown
Pump Package G - 3X4X7 1750 R.P.M. Impellers are trimmed in " incre- ments to supply required capacity. 1750 R.P.M. Responsibility for final impeller siz- ing remains with ITT Bell & Gossett. CAPACITY IN U.S. GALLONS PER MINUTE CAPACITY IN CUBIC METERS/HR Figure 46 G - Pump Curves Before Impeller Trim Planned Shutdown... -
Page 142: Troubleshooting
Pump Package Troubleshooting Table 21 Pump Package Troubleshooting Problem Possible Cause Pumps will not run in hand or auto Power to panel is disconnected Panel disconnect is in off position Overload relay tripped Control circuit fuses blown Loose connection on power circuit Motor fuses blown Motor runs hot High flow resulting in high amp draw... - Page 143 Pump Package Figure 47 Pump Package Piping Schematic RTAA-SVX01A-EN...
- Page 144 Pump Package RTAA-SVX01A-EN...
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Page 145: Unit Wiring
Unit Wiring Typical field connection diagrams, electrical schematics and connection diagrams for 70 -125 Ton RTAA units of “AO” design sequence are shown on the following pages. NOTE: The typical wiring diagrams in this manual are representative of “AO” design sequence units and are provided only for general reference. These diagrams may not reflect the actual wiring of your unit. - Page 146 3327 RTAA-SVX01A-EN...
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- Page 178 Stocking Location Inland www.trane.com Trane has a policy of continuous product data and product improvement and reserves For more information contact your local district the right to change design and specifications without notice. Only qualified technicians office or e-mail us at comfort@trane.com should perform the installation and servicing of equipment referred to in this bulletin.
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Questions and answers
There is a gasket under the unloader soleniod valva coil assembely on a RTAA chiller can that be replaced separately