Trane LO - Manuals

UNT-IOM-6 7 Model Number Description J With piping, RH K With piping, LH L With piping, RH, ext. end pocket M With piping, RH, ext. end pocket Digits 10 & 11 Design Sequence LO Digit 12 Inlet A Front toe space B Front bar grille CFront stamped louver D Bottom stamped louver E Bottom toe space F ...

UNT-IOM-6 9 Receiving and Handling UniTrane ® fan-coil and Force Flo™ cabinet heaters ship in individual cartons for maximum protection during shipment and for handling and storage ease. Each carton has tagging information such as the model number, sales order number, serial number, unit size, pipin...

10 UNT-IOM-6 This unit is intended for indoor use only. To protect the unit from damage due to the elements and prevent it from possibly becoming a contaminant source for IAQ problems, store the unit indoors. If indoor storage is not possible, the Trane Company makes the following provisions for out...

UNT-IOM-6 13 The following checklist is only an abbreviated guide to the detailed installation procedures given in this manual. Use this list to ensure all necessary procedures are complete. For more detailed information, refer to the appropriate sections in this manual. WARNING: Allow rotating fan ...

UNT-IOM-6 15 Size L (in.) 02 21 1/4 03 21 1/4 04 26 1/4 06 35 3/4 08 44 1/4 10 63 1/4 12 63 1/4 Floor Level 15.5 in. 7.5 in. L L 12.19 in. Floor Level Vertical Units Figure 4. Keyslot Hanger Hole Locations Installing the Unit Before beginning installation, refer to Table 1 on page 17 for unit weight...

16 UNT-IOM-6 4. Insert the threaded rods or lag screws in the wall before setting the unit in place. 5. Remove the front panel (cabinet unit only) by lifting it upward. 6. Position the hanger holes, located on the back of the unit, over the rod or lag screw heads, pushing the unit downward to proper...

20 UNT-IOM-6 o 1. Ensure all panels are in place. o 2 . Tighten unions adequately if unit has a factory deluxe piping package. o 3. Properly vent the hydronic coil to allow water flow through the unit. o 4. Set water flow to the unit properly if unit piping has the circuit setter valve. o 5. Check s...

UNT-IOM-6 21 Before installing field piping to the coil, consider the following . · All coil connections are 5/8 inch O.D. (or 1/2 inch nominal) female copper connections. · The supply and return piping should not interfere with the auxiliary drain pan or condensate line. See “Connecting the Condens...

22 UNT-IOM-6 Note: For vertical fan-coil units, push the main condensate drain hose and overflow condensate drain hose through to the inside of the chassis end panel to prevent them from being burned when making sweat connections. Be sure to pull the hoses back through and route to the auxiliary dra...

24 UNT-IOM-6 Before installing water piping supply and return lines to factory piping package, note the following items. · All piping connections are 5/8 inch O.D. (1/2 inch nominal) female copper connections. · The fan-coil supply and return piping should not interfere with the auxiliary drain pan ...

32 UNT-IOM-6 The unit’s airflow configuration varies dependent on the model and options ordered. A one-inch duct collar is provided on units with a ducted return and/or discharge to attach ductwork to the unit. The Trane Company recommends using galvanized sheet metal ductwork with fan-coil and cabi...

UNT-IOM-6 33 Electrical Connections Supply PowerWiring Refer to the unit nameplate to obtain the minimum circuit ampacity (MCA) and maximum fuse size (MFS) or maximum circuit breaker (MCB) to properly size field supply wiring and fuses or circuit break- ers. See Figure 2 on page 6 to reference the n...

34 UNT-IOM-6 Figure 23. The terminal unitcontrol (TUC) board pivotsdownward to provide serviceaccess. ! All field wiring should conform to NEC and all applicable state and local code require- ments. The control panel box is always on the end opposite the piping connections. Access the control box by...

36 UNT-IOM-6 Installing Wall Mounted Controls Wall mounted controls, which include the fan mode switch and the zone sensor module, ship loose inside the unit accessory bag. Position the controller on an inside wall 3 to 5 feet above the floor and and at least 18 inches from the nearest outside wall....

UNT-IOM-6 39 Fan Mode Switch Manual Fan Mode Switch The manual fan mode switch is available for fan-coil units that do not have Trane factory-mounted control packages. This four-position switch (off-hi-med-lo) allows manual fan mode selection and is available unit or wall mounted. The unit-mounted o...

UNT-IOM-6 41 Tracer ® ZN.010 and ZN.510 OperatingInformation Power-Up Sequence Entering WaterTemperatureSampling Function When 24 VAC power is initially applied to the Tracer ® ZN.010 or ZN.510, the following sequence occurs: 1. All outputs are controlled off. 2. Tracer ® ZN.010 and ZN.510 reads all...

Tracer ® ZN.010 and ZN.510 4 2 UNT-IOM-6 BIP3: OccupancySensor Binary input #3 (BIP3) on Tracer ® ZN.010 and ZN.510 is available for field- wiring an occupancy sensor, such as a binary switch or a timeclock, to detect occupancy. The sensor can be either normally open or normally closed. Reference Ta...

UNT-IOM-6 43 Tracer ® ZN.010 and ZN.510 Table 6. Binary OutputsBinary Output Description Pin BOP1 Fan high speed J1-1 BOP2 Fan medium speed J1-2 BOP3 Fan low speed J1-4 BOP4 Main valve J1-5 BOP5 Auxiliary valve/electric heat J1-6 BOP6 2-position fresh air damper J1-7 Notes: 1. In a four-pipe applica...

Tracer ® ZN.010 and ZN.510 4 4 UNT-IOM-6 The zone sensors available with the Tracer ® ZN.010 and ZN.510 provide up to three different inputs 1. Space temperature measurement (10K thermistor) 2. Local setpoint 3. Fan mode switch Wall mounted zone sensors include a thermistor as a component of the int...

Tracer ® ZN.010 and ZN.510 4 6 UNT-IOM-6 Troubleshooting Figure 28. The Tracer ZN.010 board. Table 10. Red Service LED ActivityRed LED Blink Activity LED off continuously when power is applied to the controller LED on continuously, even when power is applied to the controller LED flashes once every ...

UNT-IOM-6 47 Tracer ® ZN.010 and ZN.510 Table 12. Yellow COMM LED ActivityYellow LED Blink Activity Description LED off continuously The controller is not detecting any communication. (Normal for units in standalone applications) LED blinks The controller detects communication. LED on continuously A...

UNT-IOM-6 49 Tracer ® ZN.010 and ZN.510 Table 13. Test Sequence for 1-Heat /1-Cool ConfigurationsSteps Fan Cool Output Heat Output Damper BOP1-3 BOP4 (1) BOP5BOP6 1. Off Off Off Off Closed 2. Fan High High Off Off Closed 3. Fan Medium Medium Off Off Closed 4. Fan Low Low Off Off Closed 5. Cool High ...

Tracer ® ZN.010 and ZN.510 5 0 UNT-IOM-6 Notes: Priority Level: Diagnostics are listed in order from highest to lowest priority. The controller senses and records each diagnostic independently of other diagnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics a...

UNT-IOM-6 51 Tracer ® ZN.010 and ZN.510 Cycling Power to theController There are four ways in which diagnostics are reset: 1. Automatic reset by the controller 2. By initiating a manual output test at the controller 3. By cycling power to the controller 4. Through Rover™, Trane’s service tool The co...

Tracer ® ZN.010 and ZN.510 5 2 UNT-IOM-6 Trane’s Service Tool,Rover™ Alarm Reset Rover™, Trane’s service tool, can reset diagnostics present in the controller. For complete information about Rover™, refer to Trane publication EMTX-IOP-2 Rover Installation, Operation and Program- ming Guide . Any dev...

UNT-IOM-6 53 Tracer ® ZN.010 and ZN.510 Table 15. Fan Outputs do not EnergizeProbable Cause Explanation Random start After power-up, the controller always observes a random start that varies observed between 0 and 25 seconds. The controller remains off until the random start time expires. Power-up c...

UNT-IOM-6 59 Tracer ® ZN.520 Tracer ® ZN.520 is a communicating or standalone device. It is easily accessible in the control end panel for service. The control end panel is on the end opposite the piping. Sequence of Operations OFF: Fan is off; control valve options and fresh air damper options clos...

Tracer ® ZN.520 60 UNT-IOM-6 Follow these general guidelines when installing communication wiring: 1) Maintain a maximum 5000 ft. aggregate run 2) Install all communication wiring in accordance with the NEC and all local codes. 3) Solder the conductors and insulate (tape) the joint sufficiently when...

Tracer ® ZN.520 62 UNT-IOM-6 When the controller is in the occupied mode, the unit attempts to maintain the space temperature at the active occupied heating or cooling setpoint, based on the measured space temperature, the discharge air temperature, the active setpoint, and the proportional/ integra...

UNT-IOM-6 63 Tracer ® ZN.520 standby cooling and heating setpoints. Because the occupied standby setpoints typically cover a wider range than the occupied setpoints, the Tracer ® ZN.520 controller reduces the demand for heating and cooling the space. Also, the outdoor air economizer damper uses the ...

UNT-IOM-6 65 Tracer ® ZN.520 The Tracer ® ZN.520 controller operates the supply fan continuously when the controller is in the occupied and occupied standby modes, for either heating or cooling. The controller only cycles the fan off with heating and cooling capacity in the unoccupied mode. The econ...

Tracer ® ZN.520 66 UNT-IOM-6 Unit diagnostics can affect the Tracer ® ZN.520 controller operation, causing unit operation to be defined as abnormal. Refer to the Troubleshooting section for more information about abnormal unit operation. The heating output is controlled based on the heating capacity...

UNT-IOM-6 67 Tracer ® ZN.520 switch depending on the error. Fan speed increases as the space temperature rises above the active cooling setpoint. Table 21. Fan ConfigurationAuto fan operation Fan speed default Heating Continuous Off Low Medium High CoolingContinuous Off Low Medium High Additional fl...

Tracer ® ZN.520 68 UNT-IOM-6 Heating Cooling Fan mode Occ. Unocc. Occ. Unocc. Off Off Off Off Off Low Low Off/High Low Off/High Medium Med Off/High Med Off/High High High Off/High High Off/High Auto (continuous) Default Off/High Default Off/High fan sp. fan sp. During occupied and occupied standby m...

UNT-IOM-6 69 Tracer ® ZN.520 On a transition from off to any other fan speed, the Tracer ® ZN.520 controller automatically starts the fan on high speed and runs the fan at high speed for 0.5 seconds. This provides the ample torque required to start all fan motors from the off position. Tracer ® ZN.5...

Tracer ® ZN.520 70 UNT-IOM-6 warm enough to heat when it is five degrees above the measured space temperature. When the controller invokes the entering water temperature sampling function, the unit opens the main hydronic valve for no more than three minutes before considering the measured entering ...

UNT-IOM-6 71 Tracer ® ZN.520 to expose the damper stop screw on the control panel end. Relocate the stop screw to the appropriate position. Then loosen the stop screw wingnut and adjust the linkage. Economizer Damper With a valid outdoor air temperature (either hardwired or communi- cated), Tracer ®...

Tracer ® ZN.520 72 UNT-IOM-6 Dehumidification is possible when mechanical cooling is available, the heating capacity is located in the reheat position, and the space relative humidity setpoint is valid.The controller starts dehumidifying the space when the space humidity exceeds the humidity setpoin...

Tracer ® ZN.520 74 UNT-IOM-6 Binary outputs are configured to support the following: • Three fan stages (when one or two fan stages are present, medium fan speed can be configured as exhaust fan) • One hydronic cooling stage • One hydronic heating stage (dehumidification requires this to be in the r...

UNT-IOM-6 75 Tracer ® ZN.520 Table 28. Analog InputsDescription Terminals Function Range Zone TB3-1 Space temperature input 5° to 122°F (-15° to 50°C) Ground TB3-2 Analog ground NA Set TB3-3 Setpoint input 40° to 115°F (4.4° to 46.1°C) Fan TB3-4 Fan switch input 4821 to 4919 W (Off) 2297 to 2342 W (...

Tracer ® ZN.520 76 UNT-IOM-6 The Tracer ® ZN.520 controller accepts the following zone sensor module inputs: • Space temperature measurement (10kW thermistor) • Local setpoint (either internal or external on the zone sensor module) • Fan switch • Timed override (On) and Cancel timed override • Commu...

UNT-IOM-6 77 Tracer ® ZN.520 These setpoint limits only apply to the occupied and occupied standby heating and cooling setpoints. These setpoint limits do not apply to the unoccupied heating and cooling setpoints stored in the controller’s configuration. When the controller is in unoccupied mode, it...

Tracer ® ZN.520 78 UNT-IOM-6 Table 29. Zone sensor wiring connectionsTB1 Description 1 Space temperature 2 Common 3 Setpoint 4 Fan mode 5 Communications 6 Communications The Tracer ® ZN.520 controller communicates via Trane’s Comm5 protocol. Typically, a communication link is applied between unit co...

UNT-IOM-6 79 Tracer ® ZN.520 Table 30. Tracer ® ZN.520 Diagnostics Diagnostic Fan Other Outputs (Note 1) Condensate overflow Off Valves Closed, Fresh air damper Closed, electric heat Off, Baseboard heat Off Low temperature detection Off Valves Open, Fresh air damper Closed, electric heat Off, Basebo...

Tracer ® ZN.520 80 UNT-IOM-6 Note 3: When the outdoor air temperature sensor has failed or is not present, the Tracer ® ZN.520 controller generates a diagnostic to indicate the sensor loss condition. The controller automatically clears the diagnostic once a valid outdoor air temperature value is pre...

UNT-IOM-6 81 Tracer ® ZN.520 If a Low Temperature Detection diagnostic recurs within 24 hours after an automatic diagnostic reset, you must manually reset the diagnos- tic. See other possible methods for resetting diagnostics in this section. Manual output test: You can use the Test button on the co...

Tracer ® ZN.520 82 UNT-IOM-6 LED Operation Red Service LED Table 31. Red Service LED ActivityLED Activity Description Off continuously after Normal operation power is applied to the controller. On continuously, even when Someone is pressing the Service power is first applied to the button or the con...

UNT-IOM-6 83 Tracer ® ZN.520 Table 32. Green Status LED activityGreen LED activity Description On continuously Power on (normal operation) Blinks (one blink) The controller is in manual output test mode. No diagnostics present. Blinks (2 blinks) The controller is in manual output test mode. One or m...

Tracer ® ZN.520 84 UNT-IOM-6 LED Operation The green status LED is off when you press the Test button.To begin the manual output test mode, press and hold the Test button (which causes the green LED to go off) for at least two seconds, then release the button.The green LED blinks, indicating the con...

UNT-IOM-6 89 Terminal UnitControl (TUC) Establish service communication to the TUC by connecting a twisted wire pair to one of the following connection points. · Remote zone sensor module · Low voltage terminal strip inside the control panel This will allow the technician to view and edit the TUC co...

Terminal UnitControl (TUC) 92 UNT-IOM-6 · Occupied · Unoccupied · Tracer ® with supply fan control Occupied In the occupied mode, the factory configures the TUC for continuous occupied fan cycle. With the fan control set to auto, the fan operates at the required speed to meet the cooling or heating ...

Terminal UnitControl (TUC) 94 UNT-IOM-6 The entering water temperature sampling function allows water to circulate in an attempt to sense water cold enough to provide cooling. The function uses a timer to permit the controller and the valve to fully open while the water circulates for 3 minutes. The...

UNT-IOM-6 95 Terminal UnitControl (TUC) Note: The auxiliary electric heat option is not available with a four-pipe fan-coil unit. Units with manual fresh air dampers ship with the damper in the closed position, which is adjustable from zero to 100 percent in 25 percent incre- ments. To adjust the po...

UNT-IOM-6 99 Terminal UnitControl (TUC) Autocycle Test The autocycle test is an operating mode that activates the TUC outputs in a defined series of steps. This function allows the techni- cian to to manually exercise each TUC output by sequentially stepping through the 16 stages of the autocycle te...

Terminal UnitControl (TUC) 100 UNT-IOM-6 Table 39. Autocycle Test StagingStage LEDs (1) Fan-Coil Output Exercised 1 2 3 4 0 Off 1 l Fan low speed 2 l Fan medium speed 3 l l Fan high speed 4 ¡ l Economizer/damper 5 ¡ l ¡ l Cooling valve 6 ¡ l l ¡ Heating valve 7 ¡ l l l Electric heat stage 1 8 l ¡ ¡ ...

UNT-IOM-6 101 Terminal UnitControl (TUC) Use the TUC human interface to read the current unit diagnostic. If no diagnostics are present, the last diagnostic appears. Perform the following steps. Refer to Table 23 on page 72 for staging details. 1. Read and record the initial TUC address. 2. Set the ...

UNT-IOM-6 105 Terminal UnitControl (TUC) Sequence 1 Sequence 2 Sequence 3 Sequence 1 Sequence 2 Sequence 3 1 2 3 4 1 2 3 4 1 2 3 4 ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ ¡ ¡ ¡ l ¡ ¡ ¡ l ¡ 5 6 7 5 6 7 5 6 7 Table 42. Operating Control Mode LED Sequences and CodesSequence 1 Sequence 2 Sequence 3 1 2 3 4 1 2 3 4 1 2 ...

UNT-IOM-6 107 Terminal UnitControl (TUC) Table 43. TUC Controller DiagnosticsDiagnostic Latching? Fan Valves Elect. Heat Damper Dirty filter Yes No Action No Action No Action No Action Condensate Yes Off Closed Off Closed overflowSupply fan Yes Off Closed Off Closed failure (if configured as alarm =...

116 UNT-IOM-6 Listed below are the recommended maintenance schedules. Instruc- tions for specific maintenance procedures are given in the sections following the checklist. WARNING: Allow rotating fan to stop before servicing equipment. Failure to do so may cause severepersonal injury or death. Month...

UNT-IOM-6 119 1 . To remove the auxiliary drain pan, loosen the hose clamp (installer supplied) around the drain con- nection collar and disconnect the drain line. 2. Remove the overflow drain line to the auxiliary drain pan if it was installed. 3. Remove the condensate over- flow switch option from...

122 UNT-IOM-6 02 1 .05 2 .10 3 .14 4 .20 03 1 .06 2 .12 3 .18 4 .24 04 1 .08 2 .15 3 .23 4 .30 06 1 .11 2 .22 3 .33 4 .44 08 1 .14 2 .28 3 .42 4 .56 10 1 .18 2 .35 3 .53 4 .71 12 1 .21 2 .42 3 .62 4 .83 Note: 1-row coil refers only to the 1-row heating coil in some 4-pipe configurations. Unit Size T...

126 UNT-IOM-6 Fan BoardAssemblyRemoval Follow the procedure below when replacing the coil or making repairs to the fan or motor. WARNING: Allow rotating fan to stop before servicing equipment. Failure to do so may cause severepersonal injury or death. Vertical Units 1. Remove the front panel of cabi...

128 UNT-IOM-6 Appendix Factory PipingPackages Automatic Circuit Setter (C)

UNT-IOM-6 133 TUC Typical Wiring Diagram For Reference Only: This schematic shows typical wiring of a fan-coil. It is notintended for a basis of design or for equipment installationpurposes in the field. For an as-built schematic specific to aparticular unit, please see the ship-with schematic for t...