Trane RTHC Diagnostic Repair Manual
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Trane RTHC Diagnostic Repair Manual

Trane RTHC Diagnostic Repair Manual

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© American Standard Inc. 2002
Diagnostic
Troubleshooting
Repair
RTHC
Control Operation, Setup and Troubleshooting for
RTHC Units with UCP2 Controls
RTHC-SVD01B-EN
Order No:
Pueblo Built Units Only
Introduction
The purpose of this bulletin is to provide control operation and
general troubleshooting information on the RTHC Water Chillers
with the UCP2 control panel. Additional information on the UCP2
is located in the RTHC-IOM. It is recommended that the service
technician be familiar with the UCP2 operation prior to servicing
the microprocessor.
Warnings and Cautions appear at appropriate sections
throughout this manual. Read these carefully.
WARNING – Indicates a potentially hazardous situation
which, if not avoided, could result in death or serious injury.
CAUTION – Indicates a potentially hazardous situation
which, if not avoided, may result in minor or moderate injury. It
may also be used to alert against unsafe practices.
CAUTION – Indicates a situation that may result in equipment
or property-damage-only accidents.
NOTICE:
RTHC-SVD01B-EN
Date: August 2002

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  • Page 1 RTHC Water Chillers with the UCP2 control panel. Additional information on the UCP2 is located in the RTHC-IOM. It is recommended that the service technician be familiar with the UCP2 operation prior to servicing the microprocessor.
  • Page 2 Discussion This bulletin is intended to serve as a supplement to the RTHC- IOM, the installation, operation and maintenance manuel for all RTHC units. Subjects covered in this bulletin are intended to pro- vide more comprehensive information for the RTHC units.

  • Page 3: Table Of Contents

    Contents Control Operation, Setup and Troubleshooting for RTHC Units with UCP2 Controls ..............1 Introduction ..................1 Discussion ..................1 Units Affected ..................1 Overview ..................1 General ....................1 Service Philosophy ................1 System Description ................2 1U1 - UCM Chiller Module ..............2 1U2 - Starter Module ................
  • Page 4 Gas Pump Checkout ............53 General .................... 53 Gas Pump Checkout Procedure - Unit Off ........53 Gas Pump Checkout Procedure - Unit On ........54 RTHC Optical Sensor ............57 General .................... 57 Checkout Procedure ................ 57 Interprocessor Communication (IPC) .........59 General ....................
  • Page 5 TCI-COMM 3 and 4 (1U6) ..............86 Test Points ..................86 ICS Communications ............... 86 I/O Terminals ..................87 Printer Interface (1U7) ..............87 Test Points ..................87 Recommended Printer Setup ............88 I/O Terminals ..................89 Diagnostic Table ..............91 General .................... 91 RTHC-SVD01B-EN...
  • Page 6 Contents RTHC-SVD01B-EN...

  • Page 7: Control Operation, Setup And Troubleshooting For Rthc Units With Ucp2 Controls

    1-1. General The Unit Control Modules (UCMs) described in this troubleshooting guide provide a microprocessor based refrigeration control system, intended for use on the RTHC units. The table below describes the various modules used. Table 1-1: Unit Control Module Designations...

  • Page 8: System Description

    1-3 c. 1U3 - Stepper Module The Stepper module is designed to drive the stepper motor on the electronic expansion valve. It also receives the input from refrigerant temperature sensors and the Liquid Level sensor. RTHC-SVD01B-EN...

  • Page 9: 1U4 - Clear Language Display

    The 4U1 is not a part of UCP2. It is an external com- ponent to UCP2 and thus there is no interface. RTHC-SVD01B-EN...
  • Page 10 Overview RTHC-SVD01B-EN...

  • Page 11: Menu Item Description

    UCP2 has several added features that are new to the Series R product line. Some of those features are self-explanatory or were already dis- cussed in the RTHC-IOM. Those will not be discussed below. Other items are not self-explanatory, those items are discussed below.
  • Page 12 The initial RI Timer never is allowed to be less than 30 seconds nor any higher than the Maximum value as set in a Field Startup Menu (adjustable from 5 to 20 minutes). The initial value of the RI Timer shall RTHC-SVD01B-EN...
  • Page 13 Figure 2-1 Restart Inhibit Timer When the Restart Inhibit Timer is the overriding criteria holding the chiller off, the UCM will display this as a mode and display the remain- ing minutes: seconds remaining on the Restart Inhibit Timer. RTHC-SVD01B-EN...

  • Page 14: Soft Loading

    Menu Item Description Unlike other UCP2 applications, for RTHC, the Restart Inhibit Timer is not automatically set at 30 seconds following either a software or hard- ware reset. It is instead recalculated from the Background Timer's value which was saved nonvolatile with the previous removal or loss of power and recovered upon power restoration.

  • Page 15: External Base Loading

    The base loading control feature can only be enabled or disabled by a higher level building management system. There is no front panel means to start base loading control. Differential to start and stop are still enforced. RTHC-SVD01B-EN...

  • Page 16: Start To Transition Timing Logic

    The items that can be set in UCP2 are: Located in Service Settings, Machine Configuration Group (+-+-+-) • Maximum Acceleration Timer #1 (2- 64) • Maximum Acceleration Timer #2 (191 - 253) • Acceleration Time Out Action (shutdown, transition) RTHC-SVD01B-EN...

  • Page 17: Leaving Water Temperature Control

    • LWT Derivative Gain Setpoint (0-1000%/F) Factory Settings: The LWT settings are dependent on the unit size. Refer to the RTHC-IOM for the correct settings. It is strongly recommended that the factory defaults listed in RTHC-IOM be used without adjustment.

  • Page 18: Liquid Level Control

    Figure 2-2 Diagram of EXV Steps 2-8. Liquid Level Control On RTHC units the EXV controls off of the liquid level sensor in the evaporator rather than the discharge superheat. The liquid level sen- sor is required to provide input necessary for the control of the EXV. As the liquid level in the evaporator exceeds the optimum level the EXV will begin to close.
  • Page 19 3.56" above flange (Optimum liquid level height) - 3.39 relative to bottom inside of shell Height of R134a liquid pool at sensor's midrange is 3.39" above flange Figure 2-3 Liquid Level Sensor RTHC-SVD01B-EN...
  • Page 20 Menu Item Description RTHC-SVD01B-EN...

  • Page 21: Temperature Sensors

    3-2. Sensor Checkout Procedure All temperature sensors on the RTHC units are in thermal wells. Cycle the chiller off prior to testing the sensors. Remove the sensor of concern from the thermal well.
  • Page 22 Phoenix connector. Remove a small amount of insulation on the leads and repeat the measurements directly. Once the fault is isolated, install a new sensor, connector or both. RTHC-SVD01B-EN...
  • Page 23 By removing the Phoenix connector plug and applying the resistance to the proper pin terminals, the temperature, as sensed by UCP2, can be confirmed. Use the CLD to confirm that the input of the decade box or resistor matches the resistance tables. RTHC-SVD01B-EN...
  • Page 24 3. The thermistor resistances given do not account for the self-heating effects that are present when connected to the UCM. A connected”operating” thermistor will read a slightly lower (less than 1%) resistance. RTHC-SVD01B-EN...
  • Page 25 3. The thermistor resistances given do not account for the self-heating effects that are present when connected to the UCM. A connected “operating” thermistor will read a slightly lower (less than 1%) resistance. RTHC-SVD01B-EN...
  • Page 26 3. The thermistor resistances given do not account for the self-heating effects that are present when connected to the UCM. A connected “operating” thermistor will read a slightly lower (less than 1%) resistance. RTHC-SVD01B-EN...
  • Page 27 3. The thermistor resistances given do not account for the self-heating effects that are present when connected to the UCM. A connected “operating” thermistor will read a slightly lower (less than 1%) resistance. RTHC-SVD01B-EN...
  • Page 28 3. The thermistor resistances given do not account for the self-heating effects that are present when connected to the UCM. A connected “operating” thermistor will read a slightly lower (less than 1%) resistance. RTHC-SVD01B-EN...

  • Page 29: Current Transformer And Current Input

    CT Extension # CT Rating Winding Resistance (X13580269-) (Amps) (Ohms) 100 A 23.5 150 A 35.0 200 A 46.0 275 A 67.0 400 A 68.0 500 A 84.0 700 A 128.0 1000 A 235.0 50 A 11.5 75 A 17.0 RTHC-SVD01B-EN...
  • Page 30 To protect the compressors, the phase rotation is detected by the current transformers immediately at start up. If improper phasing is detected, within 0.3 seconds of start-up, UCP2 will trip out the compressor, and the Phase Reversal diag- nostics will be displayed. RTHC-SVD01B-EN...
  • Page 31 Current Transformer and Current Input Table 4-2: Current Overload Settings #1 and #2 as a Function of CT Factor CT Factor Setting #1 Setting #2 RTHC-SVD01B-EN...
  • Page 32 (I0x - Iave) x 100 % unbalance = Iave where: I01 + I02 + I03 Iave = and: I0x = the phase with the largest difference from Iave. Individual phase sensing error: 3% maximum (or 6% phase-to- phase max) RTHC-SVD01B-EN...
  • Page 33 Initiate stepped capacity reduction. (0% to 2% above CLS). Unload Initiate maximum capacity reduction. (more than 2% above CLS) The intent of this control is to provide maximum capacity while preventing chiller shutdown due to high compressor motor cur- rents. RTHC-SVD01B-EN...
  • Page 34 Overload Must Hold = 102% RLA Overload Must Trip in 20 +0 -3 seconds = 112% RLA Note: The above gives a nominal 20 second must trip point of 107% RLA. Overload Must Trip in 1.5 seconds = 140% RLA (Nominal) RTHC-SVD01B-EN...

  • Page 35: Ct And Starter Module Current Input Checkout Procedure

    Refer to the Component Location Drawing in the panel to identify the current transformer(s). Locate the part number/UL tag on the transformer leads and note the Trane part number which identifies the transformers. Verify the proper cur- rent transformer using 4-1 in this section.
  • Page 36 If the transformer/connector resistance proves accurate, recheck the resistance with the connector held at different angles and with a light lead pull (less than 5 lb.) to test for an intermittent connec- tion. RTHC-SVD01B-EN...
  • Page 37 CT selection, Current Overload Settings #1 and #2, or the starter module’s current input. Since the first two items were veri- fied above, that leaves only the Starter module circuitry as an issue. It is advisable to replace the Starter module. RTHC-SVD01B-EN...
  • Page 38 Current Transformer and Current Input Table 4-3: Line Current vs. Current and Volts Terminal Input Line Current Current Terminal Volts (VAC RMS) (±5) (%RLA) (mA RMS) RTHC-SVD01B-EN...
  • Page 39 Current Transformer and Current Input Table 4-3: Line Current vs. Current and Volts Terminal Input Line Current Current Terminal Volts (VAC RMS) (±5) (%RLA) (mA RMS) RTHC-SVD01B-EN...
  • Page 40 Current Transformer and Current Input RTHC-SVD01B-EN...

  • Page 41: Under-Over Voltage Transformer

    5-1. General The hardware required for the Under-Over Voltage sensing function of UCP2 is optional on RTHC units. This option must be installed in the Machine Configuration Menu (+-+-+-) and for Under-Over Voltage pro- tection to be active, Under-Over Voltage protection must be enabled in the Field Start-up Menu (++--++).
  • Page 42 Configuration Menu under Service Settings. It should match the name- plate unit line voltage. If the Under-Over Voltage Protection function continues to trip the unit, and all of the above measured ratios are within tolerance, and all CLD Under-Over Voltage setups have been verified, replace the Starter module. RTHC-SVD01B-EN...

  • Page 43: Compressor Load-Unload Solenoid

    Compressor Load-Unload Solenoid 6-1. General RTHC compressors are loaded and unloaded by means of an internal slide valve. In simple terms, the valve can regulate the amount of “bite” of the compressor rotors as they turn at relatively constant speeds.
  • Page 44 Monitor the operating mode to verify that the test is accurate. Increase the next menu item, under the Service Test Menu, “Man- ual Load/Unload Duty Cycle”, up to 50%. This will provide a 2.5 second pulse every 5 seconds sent to the solenoids to ease in testing. RTHC-SVD01B-EN...

  • Page 45: Checkout Procedure For The Slide Valve And Load-Unload Solenoids

    Connect a manifold gauge set to the schrader valve located at the end of the piston housing. This schrader allows access to the pressure behind the piston. Use hoses that are long enough to allow reading the gauges while viewing the CLD. RTHC-SVD01B-EN...
  • Page 46 Compressor Load-Unload Solenoid Figure 1: RTHC Compressor WARNING Live Electrical Components! During installation, testing, servicing and troubleshooting of this prod- uct, 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 47 “Slide Valve Control Is:” display back to “Auto” to allow for automatic control of the slide valve. With the results from the above checkout procedure use Table 6-1 to determine the possible causes of the loading problem RTHC-SVD01B-EN...
  • Page 48 Amp Draw increase may drop initially increase but will increase as aoon as the unload is deenergized Leaking unload Piston Pressure remain constant decrease decrease solenoid or decrease Amp Draw remain constant decrease decrease or decrease RTHC-SVD01B-EN...

  • Page 49: Starter Dry Run

    Starter Dry Run Section 7 Starter Dry Run 7-1. General RTHC units can have Y-Delta or Solid State Starters. This section cov- ers Y-Delta Starters. 7-2. Timing Requirements Timing requirements to operate the “Stop”, “Start”, “Short”, “Transition”, and “Run” contact closure outputs are shown below. Prior to closing the “Short”...
  • Page 50 The transition complete contact closure is expected to be an aux- iliary contact to the “Run Contactor” (1K2). The level 2 Contactor Integrity Test can be defeated, and the 1K1 contactor not be momentarily energized 1 second before start. Steps A-E only when Starter Contact Test is enabled. RTHC-SVD01B-EN...

  • Page 51: Dry Run Procedure

    Starter Dry Run is initiated in the “Service Test” group. This group is password protected (+ + - - + +, Enter). Step through the service test group to starter dry run and initiate the test. RTHC-SVD01B-EN...
  • Page 52 Starter Dry Run RTHC-SVD01B-EN...

  • Page 53: Electronic Expansion Valve

    26 to 48 TP2 (5V) to ground 4.8 to 5.2 TP3 (14V) to ground 11.45 to 15.75 TP4 (24V) to ground 23.2 to 25.1 If the voltages do not fall within the acceptable range, the Stepper module needs to be replaced. RTHC-SVD01B-EN...

  • Page 54: Exv Motor And Wiring Checkout Procedure

    If the valve does not pass the resistance test, either the connec- tor, wiring to the valve, or the valve is defective. Verify EXV wiring and connector integrity before condeming the EXV. Re-connect all plugs and change “EXV control is:” back to “Auto”. RTHC-SVD01B-EN...

  • Page 55: Motor Voltage Checkout Procedures

    6.6 to 7.0 J8-2 to ground 11.1 to 15.7 6.6 to 7.0 J8-1 to ground 11.1 to 15.7 6.6 to 7.0 If the voltages do not fall within the acceptable range, the 1U3 stepper module needs to be replaced. RTHC-SVD01B-EN...
  • Page 56 Electronic Expansion Valve RTHC-SVD01B-EN...

  • Page 57: Liquid Level Sensor Checkout

    If the measurement with the sensor disconnected is in range, the sensor is defective and should be replaced. Measure the voltage from J7-2 to J7-3 on the RTHC Stepper module with the sensor connected. 10. The voltage should measure between 0.5 and 4.5 VDC. If it is not, replace the sensor.
  • Page 58 -0.4 inches. Connect the battery to termi- nals J7-1 (to battery +) and J7-2 (to battery -) The liquid level should read 0.5 inches. If either of these readings is incorrect, replace the RTHC Stepper module. RTHC-SVD01B-EN...

  • Page 59: Gas Pump Checkout

    Gas Pump Checkout 10-1. General The falling film evaporator of the RTHC design is not a flooded evapo- rator like RTHB. Residual oil will not immediately be recovered by the oil separators and will eventually log in the evaporator. Oil cannot be returned as oil/liquid droplets pulled up the suction line of the compres- sor.

  • Page 60: Gas Pump Checkout Procedure - Unit On

    10-3. Gas Pump Checkout Procedure - Unit On To check the operation of the Gas Pump while the chiller is ON, refer to RTHC-SB-1B to do the following procedure: Important: At least a 50 psi differential must exist between the evapo- rator and condenser before performing this test.
  • Page 61 It is very difficult to braze in without damaging the teflon ball. Design Sequence H0 changed this to a o-ring boss fitting and the check valve can be replaced indepen- dently RTHC-SVD01B-EN...
  • Page 62 Gas Pump Checkout RTHC-SVD01B-EN...

  • Page 63: Rthc Optical Sensor

    Chiller Module (1U1) at J9-3 and J9-4. After 10 sec- onds, the status should read 'WET'. If so, proceed to Step 7. If the status still reads 'DRY', the Chiller Module is defective and needs to be replaced. RTHC-SVD01B-EN...
  • Page 64 Chiller Module (1U1) at J9-3 and J9-4. After 10 seconds, the sta- tus should change to 'DRY'. If the status does not change, the Chiller Module is defective and needs to be replaced. If the status reads correctly, the Optical Sensor is defective and needs to be replaced. RTHC-SVD01B-EN...

  • Page 65: Interprocessor Communication (Ipc)

    If a module fails to receive another mod- ule's transmitted data over a 15 second time period it will: Take specific action to safely shut-down (or to default) its con- trolled loads. RTHC-SVD01B-EN...

  • Page 66: Troubleshooting Modules Using Ipc Diagnostics

    Opens or shorts in the twisted pair IPC wiring or connectors Loss of power to a module Internal module failure Incorrect polarity High levels of EMI (Electro-Magnetic Interference) Module specific function selected without the Options module. Loss of ground These are discussed in more detail in the following paragraphs. RTHC-SVD01B-EN...

  • Page 67: Opens Or Shorts In The Twisted Pair Ipc Wiring Or Connectors

    NOTE: If the CLD is blank, check power to the CLD. Loss of power can most directly be diagnosed by measuring the 24 VAC voltage at the 4 pin J2 connector on all modules. Each module will have between 20 and 28 VAC across J2 1-2 and J2 3-4. RTHC-SVD01B-EN...

  • Page 68: Internal Module Failure

    Current Limit Setpoint, and Tracer/Summit Communications. 12-3 g. Loss of common ground: Verify that a good ground exists between all modules. The CLD requires a dedicated green wire ground. Verify that it is in place and has a good connection. RTHC-SVD01B-EN...

  • Page 69: Procedure For Troubleshooting Ipc Communication Diagnostics

    IPC diagnostics as shown in the Diagnostics Report of the CLD. The communication failure diagnostics and their mean- ings are shown in IPC Diagnostics of the RTHC-IOM manual. Check the IPC connections to all modules. Make sure the twisted pair wires that plug into each modules' J1 connector are making good contact with the wire.

  • Page 70: Troubleshooting Data Not Valid Diagnostics

    Make sure the wiring to the stepper motor is correct. If the wiring is not correct it will destroy the power supply on the module, and a “Loss of Comm with Stepper” will result. The correct stepper wiring follows RTHC-SVD01B-EN...
  • Page 71 Interprocessor Communication (IPC) Table 12-1: Stepper Motor Connection J8 Connector Motor Winding Pin# on Stepper Output Signal Motor Terminal Module Name Connection RTHC-SVD01B-EN...
  • Page 72 Interprocessor Communication (IPC) RTHC-SVD01B-EN...

  • Page 73: Module Power And Miscellaneous I/O

    40 character liquid crystal display with a backlight. The backlight allows the operator to read the display in low-light conditions. Depressing any key will activate the backlight. The backlight will stay activated for 10 minutes after the last key is pressed. RTHC-SVD01B-EN...

  • Page 74: Select Report Group

    When a setpoint key is pressed, a header will be displayed.The set- point headers identify the available items and setpoint functions. The Next and Previous keys function in the same manner as that described in Select Report Group, above. RTHC-SVD01B-EN...

  • Page 75: Passwords

    Refer to the IOM for the display readouts found under each menu. The first block of the flowchart is the header which is shown on the display after the menu key is pressed. For example: Press Chiller Report and the readout on the display will be RTHC-SVD01B-EN...

  • Page 76: Auto/Stop Keys

    [XXX.X F/C] 13-3 f. Auto/Stop Keys The chiller will go through a “STOPPING” mode when the Stop key is pressed if the compressor is running. This key has a red background color surrounding it to distinguish it from the others. RTHC-SVD01B-EN...

  • Page 77: Power Up

    NOTE: X’s will be replaced with appropriate software revision num- bers. When updating is successfully completed, the system will default to the first display after the Chiller Report header: OPERATING MODE [LINE 1] OPERATING MODE [LINE 2] and the backlight will be activated. RTHC-SVD01B-EN...

  • Page 78: Leds

    Do not use the aluminum module enclosure as the reference it has an anodized surface with insulating properties. The DC voltages shall be within the following tolerances. If not, replace the module. RTHC-SVD01B-EN...

  • Page 79: I/O Terminals

    Oil Return Gas Pump Fill Sol Solenoid cycles on and off on a 1minute+50 Valve and Coil: sec. cycle for a variable duty cycle while the chiller is running. This valve opens a vent line to the evaporator to allow filling of the chamber. RTHC-SVD01B-EN...
  • Page 80 Condenser water pump starter Dry SPST contact closes when call for cooling (N.O. contacts) is established. Contact opens on compressor shutdown. J16-3, 2,1 Programmable Relay Output #1 Customer programmable annunciation Relay J18-3, 2,1 Programmable Relay Output #2 Customer programmable annunciation Relay RTHC-SVD01B-EN...
  • Page 81 J28-1, 2 Condenser Water Flow Switch open: 115 VAC - means no flow input closed: <5 VAC - means flow (Software imposes a 6 second delay before responding to an open or closed contact.) RTHC-SVD01B-EN...

  • Page 82: Starter Module (1U2)

    For the checkout of the I/O, refer to the Chiller Wiring Diagrams for both high and low voltage circuits. All voltages are measured between terminal pairs specified unless otherwise indicated. Nominal voltages are given and may vary by +5%. Unregulated voltages (unreg) or 115 VAC voltages may vary by + 15%. RTHC-SVD01B-EN...
  • Page 83 Use Starter Dry Run under Service Tests to confirm operation. J6-3 HPC Switch (NC side) Normal operation: 115VAC to GRD Loss of power: 0 VAC - Confirm operation and wiring of High Pressure Cutout switch Pin J6-1 internally commoned to Pin J8-2. Trip at 180 PSIG RTHC-SVD01B-EN...
  • Page 84 Open: 115 VDC - Normally open at start-up. Close: 0VDC Use Starter Dry Run under Service Tests to confirm operation. J14-1 to J14-3 Transition contact Open: 115 VDC - Normally open at start-up, Close: 0VDC Use Starter Dry Run under Service Tests to confirm operation. RTHC-SVD01B-EN...

  • Page 85: Stepper Module (1U3)

    Table 13-7: Stepper Module Nominal Terminal Voltages (1U3) Terminal Normal Terminal Voltages for Various Designation Description of Circuit Conditions J1-1, 3 (BK) IPC Communications 19.2 kbaud serial data, RS485 signal level. J1-2, 4 (W) Refer to Interprocessor Communication (IPC) NOTE: Polarity sensitive RTHC-SVD01B-EN...

  • Page 86: Test Points

    Do not use the aluminum module enclosure as the reference as it has an anodized surface with insulating properties. RTHC-SVD01B-EN...

  • Page 87: Options Module (1U5)

    For the checkout of the I/O, refer to the Chiller Wiring Diagrams for both high and low voltage circuits. All voltages are measured between terminal pairs specified unless otherwise indicated. Nominal voltages are given and may vary by +5%. Unregulated voltages (unreg) or 115 VAC voltages may vary by + 15%. RTHC-SVD01B-EN...
  • Page 88 Unreferenced 2-10V or 4-20 mA Input (SW2-1) J8-1, 2 Ice Machine Relay Open: Normal operation (N.O.) Closed: Unit running in Ice Making mode The contacts are rated for a max. of 250 VAC or 30 VDC. RTHC-SVD01B-EN...

  • Page 89: Switch Sw2

    External Current Limit Setpoint and External Chilled Water Setpoint respectively. Refer to tables 13-11 and 13-12. Items that must be set in UCP2 are: Located in Service Settings, Machine Configuration Group (+-+-+-): RTHC-SVD01B-EN...
  • Page 90 9 VDC signal. This is polarity sensitive. For Current Limit J7-11 is battery negative and J7-12 is battery positive. For Chilled Water Set- point J9-4 is battery negative and J9-5 is battery positive, Disconnect all wiring to these inputs. The setpoints should change back to the chiller's Front Panel settings RTHC-SVD01B-EN...
  • Page 91 40.0 15.1 45.0 16.3 50.0 17.5 55.0 18.8 60.0 20.0 10.0 65.0 Table 13-11: Input values for External Current Limit Setpoints Input Current Voltage Resulting Current Limit (mA) (VDC) Setpt (%RLA) +5% 10.0 12.0 14.0 16.0 18.0 20.0 10.0 RTHC-SVD01B-EN...

  • Page 92: Tci-Comm 3 And 4 (1U6)

    13-8 b. ICS Communications ICS communication is handled the same as on previous products using the Trane proprietary Comm3 or Comm4 standard isolated serial communication link. The following are some things to check when experiencing loss of ICS communications: If ICS control is desired, check that Tracer has been selected in Setpoint Source of the Operator Settings Menu.

  • Page 93: I/O Terminals

    The positive meter lead should be connected to the pad while refer- encing the negative meter lead to the board edge ground plane. The DC voltages shall be within the previous tolerances. If not, replace the module. RTHC-SVD01B-EN...

  • Page 94: Recommended Printer Setup

    Print on Time Interval: (Enable, Disable) Print Time Interval: (1-24 hrs) Print on Diagnostic: (Enable, Disable) Number of Pre-Diagnostic Reports: (1-5) Printer, Baud Rate: 9600 Printer, Parity: None Printer, Data Bits: 8 Printer, Stop Bits: 1 Printer Handshaking: XON-XOFF RTHC-SVD01B-EN...

  • Page 95: I/O Terminals

    6 conductor cable with two RJ-12 male The recommended parts needed to make the appropriate connection using Trane parts are listed in Table 13-16. If Trane parts are not used, a DB25 male to DB9 female serial printer cable is needed to make the connection.
  • Page 96 *J1A-2 (W) * Dependent on other modules used with system, refer to unit wiring for details. J2-1 or 3 to Input Power 115 VAC, Refer to Power Supply J2-2 or 4 J4-1 thru 9 RS 232 Port Standard RS232 signal RTHC-SVD01B-EN...

  • Page 97: Diagnostic Table

    On loss of power the clock does not keep Check Main Power time, if there is an extended power loss Supply, Reset Clock (greater than 15 seconds) this diag. is also generated to alert the operator to check the clock. RTHC-SVD01B-EN...
  • Page 98 Check IPC wiring/ Comm with CLD and the chiller module lost connections communicaitons with the TCI (comm 3 or comm 4) module for 15 contiguous seconds Cond Entering Chiller Open or Short Check sensor, wiring Wtr Temp and connections. Sensor RTHC-SVD01B-EN...
  • Page 99 Check 1K2 aux. line.) Maximum Acceleration Timer was contacts. Check Starter exceeded. module. Current Starter All Running Motor current exceeded overload time vs. Check CT's. Confirm Overload immediate Modes trip characteristic. compressor is starting unloaded. Confirm refrigerant charge and overload settings. RTHC-SVD01B-EN...
  • Page 100 Check signal at input on Chilled Water Out-Of-Range Low or High, set diagnostic, the Option module. Setpoint default CWS to next level of priority (e.g. Front Panel SetPoint). This IFW diagnostic will automatically reset if the input returns to the normal range. RTHC-SVD01B-EN...
  • Page 101 Incorrect The incorrect Eprom was loaded into this Replace Stepper Stepper module. This diagnostic is detected when a Module Software factory test computer sets the unit type to Installed something other than what the Eprom software was intended for. RTHC-SVD01B-EN...
  • Page 102 2 minutes after the intention to start. Low Diff Rfgt Stepper Cprsr Inferred system differential pressure is less Check cond water. Pressure,m friendly Energized thatn 23.8 PSID for 3000PSID-sec. Cold Cond Water RTHC-SVD01B-EN...
  • Page 103 Low Oil Flow Chiller Cprsr The oil flow pressure switch detects no flow Check Oil System friendly Energized (high logic state) for 5 contiguous seconds. (Master Oil Line Solenoid Valve & Oil Filter, Hand valves, and Differential Pressure switch) RTHC-SVD01B-EN...
  • Page 104 Reprogram all menus. Type IV trying to write data into EPROM. There will likely be a recall of Engineering ROM defaults on the next reset or power transition. Replace the Chiller Module as soon as a replacement is available. RTHC-SVD01B-EN...
  • Page 105 @ t=20s set to trip) or immediate shutdown and diagnostic results. The occurrence of this diagnostic will cause the "Low Diff Rfgt Press Integral" to saturate. This provides for a restart inhibit and compressor cool-down if the diagnostic is immediately reset. RTHC-SVD01B-EN...
  • Page 106 No current was sensed on one or more of Check main power immediate Energized or the CT inputs. Time to trip shall be 1 supply & wiring. Check all Start, and second minimum, 3 seconds maximum. current transformers. Run modes. Actual trip point is 10%. RTHC-SVD01B-EN...
  • Page 107 Phase reversal, Phase rotation OK, Phase A lost, Phase B lost. Phase Seq Starter Contactor Diagnostic is not applicable for RTHC. Check wiring and Monitor: Phase immediate energized to Jumper must be installed on the Starter module.
  • Page 108 I/O such as 2-10vdc and 4-20ma inputs as well as PWM Analog outputs. The micro checks to see that the A/D value falls within an acceptable range. This diagnostic is not supported. RTHC-SVD01B-EN...
  • Page 109 Comm with the TCI within 2 minutes after power- Chiller Tracer Outdoor Tracer sensor open or shorted. Check sensor, wiring, Air Temp and connections. Sensor Fail Tracer Options Input Shorted. Check sensor, wiring, Temperature and connections. Sensor RTHC-SVD01B-EN...
  • Page 110 (Must hold = - 10 % of nominal. Under-Over Voltage Must trip = - 15 % of nominal. Reset Transformer. differential = min. of 2% and max. of 4%. Time to trip = min. of 1 min. and max. of 5 min. RTHC-SVD01B-EN...
  • Page 112 Inland - La Crosse A business of American Standard Companies www.trane.com Trane has a policy of continuous product and product data 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...

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