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Trane Rtaaiom3 Manual

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    							91RTAA-IOM-3
    Figure 50
    RTAA Control  Panel –
    130 to 200 Tons
    with Remote Evaporator Option
    LEGEND:
    Device
    Designation Description
    1F1-6 Fan Fuses, Circuit 1
    1F7-12 Fan Fuses, Circuit 2
    1F15 Control Circuit Fuse
    1F16, 1F17 Primary  Transformer
    Fuses
    1K1, 1K5 Start Contactors
    1K2, 1K6 Run Contactors
    1K4, 1K8 Transition  Contactors
    1K5, 1K7 Shorting  Contactors
    1K9-12 Fan Contactors, Circuit 1
    1K13-16 Fan Contactors, Circuit 2
    1S1, 1S2 Non-fused  Disconnect
    Switch
    1T1 Control Power
    Transformer
    1T2 Under/Over Voltage
    Transformer
    1T3-5 Compressor Current
    Transformer, Circuit 1
    1T6-8 Compressor Current
    Transformer, Circuit 2
    1TB1, 1TB2 Line Voltage Terminal
    Blocks
    1TB3 Terminal Strip, 115 V
    1TB8, 1TB9 Terminal Strip, 24 V
    1U1 Chiller Module
    1U2 Options Module
    1U3 Expansion Valve Module
    1U4 Compressor Protection
    Module, Compressor A
    1U5 Compressor Protection
    Module, Compressor B 
    						
    							92RTAA-IOM-3
    Figure 51
    Operator Interface Controls 
    						
    							93RTAA-IOM-3
    Figure 52
    Menu Formats
    OPERATING DISPLAY - MENU 0
    Selected by setting the number 0 in the “P” menu item. Compressor/circuit
    indicators will be lit Continuously in this menu to indicate which compressors/
    circuits are running. All items of Menu 0 are display only. Setpoint changes must
    be made in other menus.
    Display Code and Description
    P Menu Number
    A Operating Code
    b Last Diagnostic Code
    C Other Diagnostic Codes
    d Active Chilled Water Setpoint*
    E Evaporator Entering Water Temperature
    F Evaporator Leaving Water Temperature
    L Active Current Limit Setpoint
    *Dashes are displayed for the setpoint when the chiller is either in the
    “Ice Building” or “Ice Building Complete” mode.
    Menus
    There are six menus, four of which are
    shown on the operator interface panel
    and two factory displays, which are
    described later in this section. The
    menus are numbered as follows:
    Operating Display - Menu 0
    Service #1 Display - Menu 1
    Service #2 Display - Menu 2
    Auxiliary Options Display - Menu 3
    Factory Display - Menu 4
    Factory Display - Menu 5
    Each menu can be considered to be a
    page of data, formatted as shown in
    Figure 52. The operator can view one
    line of the menu at a time (menu item)
    on the digital display and can scroll
    through the menu by using the Display
    Up and Display Down keys. For
    example, when the digital display
    shows “P 0”, the UCM is in the
    “Operating Display” menu. By
    depressing the Display Down key one
    time, the next line of the menu,
    “Operating Code”, will be shown as an
    “A”, along with the current unit
    operating status. All operating and
    diagnostic codes are described on the
    “Condition Codes” label, as shown in
    Figure 53.There are a few exceptions to the
    scrolling function. When a menu
    selection represents multiple pieces of
    information:
    “C” Menu Item - Other Diagnostic
    Codes”: When this menu item is
    selected, depressing the Display Down
    key will display diagnostic history in
    code number sequence. Use the
    Display Up key to return to the top of
    the list. While in the “C” menu item,
    flashing indicates that the information
    is currently “true”, whereas steady, or
    non-flashing indicates historic data
    only. The digital display will not
    advance to the next item (d) until all
    diagnostics have been displayed. If
    there are no diagnostics to display, the
    data field will be blank for one key
    stroke.
    Compressor/Circuit Parameters:
    Because the unit has two, three or four
    compressors and two refrigerant
    circuits, items that refer to compressors
    or circuits will remain selected until
    information for all have been
    displayed. For example, assume a
    “29”, “Compressor Starts”, menu
    selection on a two compressor unit.
    The menu numbered “29” will be
    displayed and the indicator over the
    “A” compressor will be flashing. By
    depressing the Display Down key one
    time, the “29” will remain but the
    indicator light over the “B” compressor
    will be flashing. Another Display Downkey stroke will display menu “2A”,
    Compressor Hours, with  compressor
    “A” indicator flashing. If either the
    Display Up or Display down keys are
    held down, the scrolling will continue
    until the key is released, or until
    reaching the top or bottom of the
    menu. In this case, the display will
    return to the “P” menu position and
    stop.
    To change menus, scroll to the “P”
    menu position and use the Set Point
    Up or Set Point Down keys. For
    example, assume that the display
    shows “P 0” and it is desired to view
    the Auxiliary Options on Menu 3.
    Depress the Set Point Up key three
    times and the “P 3” menu will be
    displayed. To return to Menu 0, depress
    the Set Point Down key three times or
    Set Point Up key once (to wrap around)
    and “P 0” will be displayed. This
    procedure will work for menus 0
    through 3.
    A combination of key strokes is
    required to access menus 4 and 5. With
    the display in the “P” menu position
    (P), use the Set Point Up and Down
    keys to display “0, 1, 2, 1, 2, 3, 2, 3, 4”.
    Once in the “P 4” menu, use the Set
    Point Up key to access menu 5.
    All menus are always accessible,
    whether the unit is in a “running” or
    ‘stopped” mode. 
    						
    							94RTAA-IOM-3
    Figure 52
    Menu Formats (Continued)
    SERVICE #1 DISPLAY – MENU 1
    Selected by setting the number 1 in the “P” menu item. The compressor circuit indicators will not be lit continuously in this
    menu to indicate which compressors are running. As the menu is advanced, the appropriate compressor/circuit indicator will
    flash.
    UCM Based Setpoint
    Display Code and Description Defaults Range
    P Menu Number
    10 Front Panel Chilled Water Setpoint 44 F 0 to 65 F
    11 Design Delta Temperature Setpoint 10 F 4 to 30 F
    12 Differential to Start Setpoint 2 F 2 to 30 F
    13 Front Panel Current Limit Setpoint 120% 40 to 120%
    14 Outdoor Air Temperature (Optional)
    15 Low Ambient Lockout - d/E (Optional) d
    16 Low Ambient Lockout Setpoint - d/E (Optional)* 20 F -20 to 40 F
    17 Cond. Entering Water Temperature (Optional) RTAA Non Applicable
    18 Cond. Leaving Water Temperature (Optional) RTAA = Non Applicable
    19 Service Pumpdown d/E (Stop/Reset only)** d
    1A Circuit Lockout d/E** d
    1b Circuit Diagnostics Reset** d
    *Dashes are displayed for the setpoint when the Low Ambient Lockout (15) is disabled.
    **Displayed by Compressor/Circuit
    SERVICE #2 DISPLAY - MENU 2
    Selected by setting the number 2 in the “P” menu item. Compressor/Circuit indicators shall not be lit continuously in this
    menu to indicate which compressors are running. As the menu is advanced, the appropriate compressor/circuit indicator will
    flash.
    UCM Based Setpoint
    Display Code and Description Defaults Range
    P Menu Number
    20 Compressor Mode*
    21 Compressor Suction Refrigerant Temp.*
    22 Compressor Evap. Refrigerant Temp.*
    23 Evaporator Refrigerant Pressure*
    24 Saturated Condenser Refrigerant Temp.*
    25 Condenser Refrigerant Pressure*
    26 EXV Test - d/E (Only in STOP/RESET)* d
    27 Compressor % RLA (Highest leg)*
    28 % Line Volts (Optional)
    29 Compressor Starts (Optional)*
    2A Compressor Hours (Optional)*
    2b Compressor Test d/E d
    *Displayed by compressor/circuit
    Compressor Starts, Compressor Hours and % Line Volts will be displayed as dashes (e.g. “2A when this option is not installed.
    After the EXV test has been completed, the “E” will be automatically reset to “d”.
    See “Electronic Expansion Valve (EXV) Test”.
    The Condenser Refrigerant Pressure and the Evaporator Refrigerant Pressure, displayed on the UCM, are the saturated
    condenser and evaporator temperatures converted to R-22 pressure readings. The units are PSIG (Kilopascal gauge) and
    referenced to an elevation of sea level or 14.6960 psia (101.3289 KPa absolute). 
    						
    							95RTAA-IOM-3
    Figure 52
    Menu Formats (Continued)
    AUXILIARY OPTIONS – MENU 3
    Selected by setting the number 3 in the “P” menu number position. Compressor/circuit indicators will not be lit continuously
    in this menu to indicate which compressors/circuits are running.
    UCM Based Setpoint
    Display Code and Description Defaults Range
    P Menu Number
    30 External Chilled Water Setpoint - d/E d
    31 External Current Limit Setpoint - d/E d
    32 Ice Machine Control - d/E d
    33 Active-Ice Termination Setpoint*
    34 Front Panel Ice Termination Setpoint 27 F 20 to 31 F
    35 Return Reset - d/E** d
    36 Zone Reset - d/E** d
    37 Outdoor Reset - d/E** d
    38 Reset Ratio Setpoint***
     Return50% 10 to 120%
    Zone100% 50 to 300%
    Outdoor 10% -80 to 80%
    39 Start Reset Setpoint***
    Return10 F 4 to 30 F
    Zone78 F 55 to 85 F
    Outdoor 90 F 50 to 130 F
    3A Maximum Reset Setpoint***
    Return5 F 0 to 20 F
    Zone5 F 0 to 20 F
    Outdoor5 F 0 to 20 F
    3b External Circuit Lockout d/E d
    *Dashes are displayed for the setpoint when the chiller is not in the “Ice Building” or “Ice Building Complete” mode.
    **The UCM will permit only one type of reset (Return, Zone, or Outdoor) to be selected at one time. For example, if Return
    Reset is enabled, an attempt to enable Zone Reset would disable RETURN RESET and enable Zone Reset automatically.
    ***The UCM contains setpoints for each of the types of reset. The setpoint displayed will be for the type of reset enabled.
    If no reset is enabled, dashes will be displayed. 
    						
    							96RTAA-IOM-3
    Figure 52
    Menu Formats (Continued)
    FACTORY DISPLAY #1 - MENU 4
    Caution: Do not leave unit unattended while in Menu 4 or 5. Inadvertent unit safety setpoint changes could occur.
    Selected by setting the number 4 in the “P” menu item. Unlike menus 0 through 3, the number 4 can only be set by entering a
    combination of numbers. This combination consists of a sequence of “P” menu numbers -0, 1, 2, 1, 2, 3, 2, 3. 4.
    Compressor/circuit indicators will not be lit continuously in this menu to indicate which compressors are running. As the
    menu is advanced the appropriate compressor/circuit indicator will flash.
    UCM Based Setpoint
    Display Code and Description Defaults Range
    P Menu Number
    40 Leaving water Temp. Cutout Setpoint 35 F -10 to 35 F
    41 Low Refrigerant Temp. Cutout Setpoint 22 F -39 to 35 F
    42 Condenser Limit Setpoint - % HPC 90% 80 to 120%
    43 Lead/Lag - d/E E
    44 SI Display Units - d/E d
    45 Unit Line Voltage* 460 V
    46 Under/Over Voltage Protection - d/E d
    47 Phase Imbalance Protection d/E E
    48 Phase Reversal Protection d/E E
    49 Superheat  Setpoint 8 F 4 to 20 F
    4A EXV Control Response Setpoint** 20 2 to 200
    4b LWT Control Response Setpoint 40 2 to 220
    4C ICS Address (Optional)
    4d Fan Control Deadband Bias** 0 -50 to +50
    4E Programmable Relay Setup 1 1 to 12
    (see Alarm/Running/Maximum Capacity Contact Outputs)
    4F Restart Inhibit Timer 120 sec. 30 to 120 sec.
    *Entry will be selected from 200, 220, 230, 346, 380, 415, 460, 500 or 575 volts. Dashes will be displayed if the Under/Over
    Voltage Protection option is not installed.
    **Displayed by circuit. 
    						
    							97RTAA-IOM-3
    Figure 52
    Menu Formats (Continued)
    FACTORY DISPLAY #2 - MENU 5
    Caution: Do not leave unit unattended while in Menu 4 or 5. Inadvertent unit safety setpoint changes could occur.
    Selected by setting the number 5 in the “P” menu item. Unlike menus 0 through 3, the number 5 can only be set after menu 4
    has been selected, as described on the previous page.
    Compressor/circuit indicators 
    will not be lit continuously in this menu to indicate which compressors are running. As the
    menu is advanced the appropriate compressor/circuit indicator will flash.
    UCM Based Setpoint
    Display Code and Description Defaults Range
    P Menu Number
    50 Number of Compressors 1 1, 2, 3, 4
    51 Compressor  Tons* 100 25, 30, 40,50, 60, 70, 85, 100
    52 Low Water Temp EXV Gain Compensation d/e d
    53 Fan Control - d/E E
    54 Fans per Circuit** 7 4, 5. 6,7. 8, 10, 12, 14
    55 Reduced Inrush Starting - d/E d
    56 Compressor Current Overload Setting (to match DIP Switch)* 00 00 to 31
    57 GP Compressor Unit d/E d
    58 Low Ambient - Half Air Flow Fan d/E d
    59 LATSM d/Ed
    5A NNS d/Ed
    5b Number of EXV Valves per Circuit** 1 1. 2
    5c Future Option** d
    *Displayed by compressor.
    **Displayed by circuit 
    						
    							98RTAA-IOM-3
    Figure 53
    Condition/Diagnostic Codes
    UNIT OPERATING  STATUS COMPRESSOR  OPERATING  STATUSCODE DESCRIPTION CODE DESCRIPTION
    Blank UCM Power Off 00Compressor Stop
    888888.8 UCM Paw Up 16 Compressor  Lockout
    00 Unit Stop 17 Cprsr Service Pumpdown
    01 Auto-Local 70 Cprsr Restart Inhibit
    02 Auto-Remote 72 Cprsr Start
    17 Service Pumpdown 74 Run Normal
    70 Unit Restart Inhibit 75 Run: Current Limit
    72 Unit Start 76 Run: Condenser Limit
    74 Run:Normal 77 Run: Evaporator Limit
    75 Run:Current Limit 7E Run:Unload
    78 Run:Condenser Limit
    77 Run:Evaporator Limit
    7E Run:Unload
    88 Reset
    DIAGNOSTIC TYPES100 External Unit Stop
    101 Ice Building Complete MMR Machine Shutdown-Manual Reset
    118 EXV Test CMR Circuit Shutdown-Man Reset
    174 Ice Building; Normal MAR Machine Shutdown-Auto Reset
    175 Ice  Building: Current Limit CAR Circuit Shutdown-Auto Reset
    176 Ice  Building: Condenser Limit IFW Informational-Warning
    177 Ice Building: Evaporator Limit
    200 Low Ambient Run Inhibit
    UNIT DIAGNOSTICS CONDITIONFLASHING DISPLAY: MEANS:
    A xxx A New CMR, CAR. or IFW Diagnostic Exists.
    A xxx « C yyy Operating Code when MMR or MAR occurred. Diagnostic currently inhibiting operation.
    b yyy Manual reset required to restore full operation. This or other latching diagnostics exist.
    C yyy Condition creating MAR, CAR or IFW still exists. If MMR or CMR, manual reset required.
    10 uu The chilled water setpoint is too close to a cutout setpoint.
    DASHES: MEANS:
    d ---- The chiller is in either ice bldg or ice bldg compl; Ivg chld wtr stpt is not applicable.
    33 ---- The chiller is in normal cooling; the active ice termination setpoint is not applicable.
    Other (e.g. 14----) Option either not installed or not enabled.
    CODE DESCRIPTION TYPE CODE DESCRIPTION TYPE
    87 Chock External Chilled Water Stpt IFW 19F Phase Loss - Cprsr D CMR
    89 Check External Current Limit Stpt IFW 1AO Power Loss - Cprsr A CAR
    8A Chilled Water Flow (Ent Wtr Temp) MMR 1A1 Power Loss - Cprsr 8 CAR
    8E Evap Entering Water Temp Sensor MMR 1A2 Power Loss - Cprsr C CAR
    8F Cond Rfgt Tamp Sensor - Ckt I CMR 1A3 Power Loss - Cprsr D CAR
    90 Cond Rfgt Temp Sensor - Ckt 2 CMR 1A4 Remote communications Loss IFW
    93 Evap Rfgt Temp Sensor - Ckt I CMR 1A5 Oil Flow Control - Cprsr A CMR
    94 Evap Rfgt Tamp Sensor - Ckt 2 CMR 1A6 Oil Flow Control - Cprsr B CMR
    A0 Zone Temp Sensor IFW 1A7 Oil Flow Control - Cprsr C CMR
    A1 Outdoor Air Temp Sensor IFW 1A8 Oil Flow Control - Cprsr D CMR
    Ab Evap Leaving Wtr Temp Sensor MMR 1A9 EXV Elec Drive Ckt - Rfgt Ckt I CMR
    bA Overload Trip - Cprsr A CMR 1AA EXV Elec Drive Ckt - Rfgt Ckt 2 CMR
    bb Overload Trip - Cprsr 0 CMR 1Ad Memory Error Type I (See Oper Manual) IFW
    bC Overload Trip - Cprsr C CMR 1AE Low Differential Press - Ckt I CMR
    bd Overload Trip - Cprsr D CMR 1AF Low Differential Press - Ckt 2 CMR
    bE High Pressure Cutout - Cprsr C CMR 1b2 Severe Phase Unbalance - Cprsr A CMR
    bF High Pressure Cutout - Cprsr D CMR 1b3 Severe Phase Unbalance - Cprsr B CMR
    C5 Low Chilled Water Temp (Unit off) IFW 1b4 Severe Phase Unbalance - Cprsr C CMR
    C6 Low Chilled Water Temp (Unit on) MAR 1b5 Severs Phase Unbalance - Cprsr 0 CMR
    CA Contactor - Cprsr A MMR 1b6 Compressor Overload Setting - Cprsr A IFW
    Cb Contactor - Cprsr B MMR 1b7 Compressor Over load Setting - Cprsr B IFW
    cc Contactor - Cprsr C MMR 1b8 Compressor Overload  Setting - Cprsr C IFW
    Cd Contactor - Cprsr D MMR 1b9 Compressor Overload  Setting - Cprsr D IFW
    d7 Over Voltage MAR 1bA Phase Unbalance - Cprsr  A CMR
    d8 Under Voltage MAR 1bb Phase Unbalance - Cprsr  8 CMR
    Ed Chilled Water Flow Interlock MAR 1bC Phase Unbalance - Cprsr  C CMR
    F5 High Pressure Cutout - Cprsr A CMR 1bd Phase Unbalance - Cprsr  D CMR
    F6 High Pressure Cutout - Cprsr B CMR 1bE Winding Temp. - Cprsr A CMR
    Fd Emergency Stop Input MMR 1bF Winding Temp. - Cprsr B CMR
    180 Starter Transition - Cprsr A CMR 1C0 Winding Temp. - Cprsr C CMR
    181 Starter Transition - Cprsr B CMR 1C1 Winding Temp. - Cprsr D CMR
    182 Starter Transition - Cprsr C CMR 1C2 Discharge Temp. - Cprsr  A CMR
    183 Starter Transition - Cprsr D CMR 1C3 Discharge Temp. - Cprsr  8 CMR
    184 Phase Reversal - Cprsr A CMR 1C4 Discharge Temp. - Cprsr  C CMR
    185 Phase Reversal - Cprsr 8 CMR 1C5 Discharge Temp. - Cprsr  D CMR
    186 Phase Reversal - Cprsr C CMR 1C6 High Differential Pressure - Ckt I CMR
    187 Phase Reversal - Cprsr D CMR 1C7 High Differential Pressure - Ckt 2 CMR
    190 Low Superheat - Ckt I CMR 1d1 Memory Error Type 11 (See Oper Manual) IFW
    191 Low Superheat - Ckt 2 CMR 1d2 Memory Error Type III (See Oper Manual) IFW
    194 Low Evap Rfgt Tamp - Ckt I CMR 1d3 Cprsr Suction Temp. Sensor - Ckt 1 CMR
    195 Low Evap Rfgt Temp - Ckt 2 CMR 1d4 Cprsr Suction Temp. Sensor - Ckt 2 CMR
    198 Low Oil I Flow - Cprsr A CMR 1d7 Phase Reversal Prot. Lost - Cprsr A CMR
    199 Low 01 1 Flow - Cprsr B CMR 1d8 Phase Reversal Prot. Lost - Cprsr B CMR
    19A Low Oil Flow - Cprsr C CMR 1d9 Phase Reversal Prot. Lost - Cprsr C CMR
    19b Low Oil Flow - Cprsr D CMR 1dA Phase Reversal Prot. Lost - Cprsr D CMR
    19C  Phase Loss - Cprsr A CMR 1db Slave-Exv Elec Drive Ckt - Rfgt Ckt 1 CMR
    19d Phase Lose - Cprsr B CMR 1dc Slave-Exv Elec Drive Ckt - Rfgt Ckt 2 CMR
    19E Phase Loss - Cprsr C CMR 4xy See Operator’s Manual – – –
    X3956048201 Rev. B
    Condition Codes 
    						
    							99RTAA-IOM-3
    Chiller Switch
    The chiller switch has three positions:
    Top Position AUTO REMOTE
    Middle Position AUTO LOCAL
    Bottom Position STOP/RESET
    With the switch in the AUTO REMOTE
    position, the chiller will operate
    normally using remote setpoints. Read
    and write remote communications may
    be performed. Any call for cooling
    based on Leaving Water Temperature
    (LWT) and the remote (e.g. Tracer)
    setpoints, will start the unit. The active
    chilled water setpoint (CWS) can be the
    remote CWS, a reset remote setpoint
    based on return, zone, or outdoor
    temperature reset, or a 4-20 mA/0-10
    VDC external CWS. The active Current
    Limit Setpoint (CLS) can be the Remote
    CLS or a 4-20 mA/0-10 VDC External
    CLS. If remote communication is lost,
    the UCM will revert to the Front Panel
    (or local) chiller settings.
    When the chiller switch is in the AUTO
    LOCAL position, the chiller will operate
    normally using Front Panel (or local)
    setpoints. Read and write remote
    communications may be performed,
    but remote setpoints cannot be used
    for control. The unit will run when there
    is a call for cooling based on the LWT
    and the Front Panel or local setpoints.
    The active CWS can be the local
    setpoint, a reset setpoint based on
    return, zone, or outdoor temperature
    reset, or a 4-20 mA/0-10 VDC external
    CWS. The active Current Limit Setpoint
    can be the local setpoint or a 4-20 mA/
    0-10 VDC External CLS. Remote (e.g.
    Tracer) setpoints communicated over
    the serial communications link will be
    ignored, but remote devices can still
    read all unit control data.In the STOP/RESET position, the UCM
    is powered but operation of the unit is
    prevented. All outputs are de-energized
    and the chiller is stopped. The alarm
    relay output may be energized if an
    alarm condition exists.
    If any of the chillers are running when
    the chiller is put into the STOP/RESET
    position, the chiller will go into the Run:
    Unload mode for at least 20 seconds
    before shutting down the compressors.
    Although not a “position” on the chiller
    switch, it can be used to perform the
    function of manually resetting all
    latching diagnostics and clearing all
    historic diagnostics. Latching
    diagnostics can be reset by manually
    toggling the chiller switch from the
    STOP/RESET position to either AUTO
    position.
    Historic diagnostics (“C” menu item)
    can be cleared by depressing the
    “Display Down” key while manually
    toggling the chiller switch from the
    STOP/RESET position to either AUTO
    position (no compressor operating).
    Moving the chiller switch from the
    STOP/RESET position to either AUTO
    position will reset the controls, with
    one exception. If the chiller operating
    status is Run:Unload, this sequence will
    go to completion before the reset is
    executed. During the completion of the
    Run:Unload, the reset is “queued up”
    and operated on only after completion
    of the Run:Unload. After reset is
    completed, the digital display will
    return to “A” Operating Code. 
    						
    							100RTAA-IOM-3
    Menu Function
    Descriptions and
    Selection
    Selecting Variables and Options
    All variables and options will be set by
    depressing the SET POINT UP and SET
    POINT DOWN keys. The setpoints will
    be increased or decreased by one least
    significant digit (1 F, 0. 1 C, or 1 integer
    value) with each key depression. If the
    key is held down, the setpoint will
    continue to be increased or decreased
    until the key is released. The minimum
    and maximum values of all setpoints
    are limited by system design and the
    setting operation will stop when either
    the minimum or maximum setpoint is
    displayed. See Figure 52 for setpoint
    ranges.
    Options are also selected using the SET
    POINT UP and SET POINT DOWN keys.
    Use the SET POINT UP key to select the
    “Enable” option and the letter “E” will
    appear on the display. Use the SET
    POINT DOWN key to select the
    “Disable” option and the letter “d” will
    be displayed. Certain items in Menus 4
    and 5 will be integers with various
    endpoints and units. See Figure 52.
    Menu 0 – Operating Display
    A - Operating Code: This is the current
    unit operating status, e.g. A 74, which,
    as shown in Figure 53, is Run:Normal.
    b - Last Diagnostic Code: The last
    diagnostic detected by the UCM is
    stored and can be seen by displaying
    this I  item.
    C - Other Diagnostics: All diagnostics
    detected by the UCM will be stored in
    preprescribed code number sequence,
    as shown in Figure 53, rather than the
    order in which they occurred. All
    flashing codes found under this item
    are currently active or “Latched”
    diagnostics. For additional information,
    see “Menus”.
    Diagnostics will be stored only once,
    even though the diagnostic may have
    occurred several times. There is no
    chronological sequence to the
    diagnostics that may be in the “C”
    menu item.d - Active Chilled Water Setpoint: The
    setpoint (display only) to which the
    chiller is controlling. This may be the
    same as the Front Panel Chilled water
    Setpoint (code 10 in Menu 1), but it
    may also be a setpoint that is being
    reset or loaded from a remote
    controller, such as a Tracer, multiple-
    machine controller, or a remote display
    panel.
    E - Evap. Entering Water Temp.: The
    temperature of the water as measured
    by the evaporator entering water
    temperature sensor. F - Evap. Leaving
    Water Temp.: The temperature of the
    water as measured by the evaporator
    leaving water temperature sensor.
    L - Active Current Limit Setpoint: The
    current limit setpoint (display only) to
    which the chiller is controlled. This may
    be the same as the Front Panel Current
    Limit setpoint (code 13 in Menu 1), but
    it may also be a setpoint that was
    loaded from a remote controller, such
    as a Tracer, multiple-machine
    controller.
    Menu 1 – Service #1 Display
    10 - Front Panel Chilled Water Setpoint:
    The temperature selected at the UCM
    for the desired chilled water.
    11 - Design Delta Temp. Setpoint: The
    difference between the entering and
    leaving chilled water temperatures at
    full load. This will be a function of GPM
    through the evaporator.
    12 - Differential To Start Setpoint: This
    temperature, when added to the
    leaving chilled water setpoint, is the
    temperature at which the chiller will be
    started.
    Note: 1.5 F below chill water setpoint,
    the UCM will initiate an integrator to
    shut off the l
    ast compressor on a
    decrease in cooling load.
    13 - Front Panel Current Limit Setpoint,
    The percent of current limit selected at
    the UCM for the system. See
    discussion in “Current Limit Setpoint”.
    14 - Outdoor Air Temperature
    (Optional): The ambient temperature as
    measured by an outdoor temperature
    sensor.15 - Low Ambient Lockout (Optional): If
    the unit is installed with optional
    Outdoor Air Temperature Sensor, the
    entry in this code will enable or disable
    the setpoint in code 16. See discussion
    in “Low Ambient Lockout”.
    16 - Low Amb. Lockout Setpoint
    (Optional): The temperature of the
    outside air below which the unit will
    not be permitted to operate. See
    discussion in “Low Ambient Lockout”.
    17 - Cond. Entering Wtr. Temp.: Not
    applicable, with this air-cooled
    condenser unit.
    18 - Cond. Leaving Wtr. Temp.: Not
    applicable, with this air- cooled
    condenser unit.
    19 - Service Pumpdown: Must be
    manually “Enabled” by service
    personnel from the UCM display. The
    unit must be in STOP/RESET and
    service pumpdown can be performed
    only once for every power-up of the
    UCM. Restart inhibit will be ignored,
    the EXV will be prepositioned (20
    seconds) and the compressor selected
    will start and run for one minute.
    Manual closing of the liquid line angle
    valve will be required.
    Caution: Do not pumpdown
    compressor more than once.
    1A -Circuit Lockout: Allows service
    personnel to set a lockout, preventing a
    circuit from operating. With the display
    indicating the number of the circuit to
    be locked out, change the display to
    “E” for circuit lockout. Once circuit
    lockout is enabled, the circuit will
    remain locked out even through a reset
    or power down. Entering a “d” will
    return the circuit to operational status.
    1b - Circuit Diagnostic Reset: Allows
    service personnel to reset a Circuit
    Manual Reset (CMR) diagnostic
    without having to terminate operation
    of the entire chiller via the STOP/RESET
    switch. With the display indicating the
    number of the circuit to be reset,
    change the display to “E” to reset. After
    reset, the display will automatically
    return to “d”. 
    						
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