Trane LO Installation & Operation Manual Download Page 92

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Terminal Unit
Control (TUC)

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 capacity.

However, the fan will run at one set speed continuously if set in the

high, medium, or low position.

Unoccupied

In the unoccupied mode, the TUC cycles the fan between off and high

speed to satisfy the unoccupied setpoint. However, if the occupied

preheat damper position is closed and the room setpoint is 3

above (cool down) or 3

F below (warm-up) setpoint, the fan runs at

high speed when exiting the unoccupied mode to occupied mode.

Also, if the occupied preheat damper position is configured as

closed, the fan will run in high speed any time the room temperature

falls 3

F or below room setpoint in occupied heating mode.

Tracer

with supply fan control

If the unit is communicating with Tracer

and the

supply fan control

programming point is configured for Tracer

(the factory configures as

local), then Tracer

will control the fan regardless of the fan mode

switch position.

All TUC lockouts (latching diagnostics) are manually reset whenever

the fan mode switch is set to the off position or when power is

restored to the unit. The last diagnostic to occur is retained until the

unit power is disconnected. Refer to Trane publication,

EMTX-IOP-1

TUC Installation Operation and Programming Guide

, for specific

instructions regarding the procedure for running the TUC.

Adjust the cooling setpoint by using either the setpoint adjustment

knob, resetting the TUC default values, or Tracer

downloaded values.

The factory configures the o

ccupied heat or cool setpoint source

for

local mode. The local mode allows the local setpoint knob to deter-

mine the cooling setpoint If using Tracer

to define the heat or cool

setpoint source, the TUC uses the Tracer

setpoints. If Tracer

is not

communicating, the TUC will attempt to obtain the heating and

cooling setpoint from a local source. If there is no input from a local

source, the TUC will resort to its default values.

The TUC limits the parameters of the cooling setpoint input (adjust-

able from either the setpoint knob or Tracer

) to prevent excessively

TUC Sequence of Operation

Cooling and
Heating Operation

Setpoint Control

Summary of Contents for LO

Page 1: ...on Operation Maintenance UniTrane Fan Coil Room Conditioners Force Flo Cabinet Heaters Sizes 02 12 Low Vertical Fan Coils Sizes 03 06 UNT IOM 6 Supercedes UNT IOM 5 April 2000 Models LO Design Sequence and Later ...

Page 2: ... Activity 46 Troubleshooting 46 Yellow COMM LED 47 Manual Output Test 48 Diagnostics 50 Resetting Diagnostics 51 Troubleshooting 53 Tracer ZN 520 59 Troubleshooting 83 Troubleshooting 85 Tracer Communication Wiring 88 Service Communication Wiring 89 Wall Mounted Zone Sensor Module 89 TUC Human Interface 90 Cooling and Heating Operation 92 TUC Sequence of Operation 92 Fan Mode Operation 93 Entering...

Page 3: ...it or wall mounted Units with a Tracer ZN 010 ZN 510 ZN 520 or TUC also feature a split combina tion unit mounted fan mode switch with a wall mounted setpoint dial The Tracer controllers ZN 010 ZN 510 and ZN 520 utilize binary outputs to operate 2 position control valves supply fan s 2 position dampers and electric heat The TUC utilizes binary outputs to control the fan and optional auxiliary heat...

Page 4: ...4 UNT IOM 6 Model F Wall Hung Cabinet Model B Vertical Cabinet Model A Vertical Concealed Cabinet Styles Model C Horizontal Concealed Model D Horizontal Cabinet Model E Horizontal Recessed ...

Page 5: ...w Vertical Concealed Model L Low Vertical Cabinet Model M Inverted Vertical Cabinet Model N Inverted Vertical Recessed Fan coil only Force Flo cabinet heater only Model J Vertical Slope Top Cabinet Model H Vertical Recessed ...

Page 6: ... determine a unit s specific options reference the model number on the unit nameplate on the fan scroll The unit nameplate also identifies the serial number sales order number and installation and operating specifications See Figure 2 for the nameplate location Reference pages 7 8 for a detailed explanation of the model number Complete the installation checklist on page 13 to ensure proper and saf...

Page 7: ... row cooling or heating only K 2 row cooling heating elec heat L 3 row cooling heating elec heat M 4 row cooling heating elec heat N Electric heat only 1 stage P 2 row cooling heating 1 row heating Q 2 row cooling heating 2 row heating R 3 row cooling heating 1 row heating U Electric heat only 2 stage V Electric heat only low kw 1 stage W Steam coil Digit 19 Coil Fin Series 2 144 Digit 20 Air Vent...

Page 8: ... way 2 pos N C 50 psig J 2 way mod Cv 0 7 50 psig K 3 way mod Cv 0 7 50 psig L 2 way mod Cv 1 5 50 psig M 3 way mod Cv 1 5 50 psig N 2 way mod Cv 2 5 50 psig P 3 way mod Cv 2 5 50 psig Q 2 way mod Cv 4 0 50 psig R 3 way mod Cv 4 0 50 psig Digit 29 Piping Package 0 None A Ball valve supply return B Ball valve supply manual circuit setter return C Ball valve supply auto circuit setter D Ball valve s...

Page 9: ...ng the damage on the freight bill Check the unit casing fan rotation coils condensate pan filters and all options or accessories o 3 Inspect the unit for concealed damage and missing compo nents soon after delivery and before storing Report concealed damage to the delivering carrier within the allotted time after delivery check with the carrier on the allotted time to submit a claim o 4 Do not mov...

Page 10: ... portion of the unit contacts standing water at any time 2 Cover the entire unit with a canvas tarp only Do not use clear black or plastic tarps as they may cause excessive moisture conden sation and equipment damage Note Wet interior unit insulation can become an amplification site for microbial growth mold which may cause odors and health related indoor air quality problems If there is visable e...

Page 11: ...t level using the chassis end panels as a reference point Do not use the coil or drain pan as the reference point since the coil is pitched and the drain pan has an inherent positive slope to provide proper drainage o 4 Condensate Line A continuous pitch of 1 inch per 10 feet of condensate line run is necessary for adequate condensate drainage o 5 Wall and Ceiling Openings Recessed units only Refe...

Page 12: ...osite the piping The unit has a modular fan board assembly that is easy to remove Also the main drain pan is easily removable for cleaning See the Maintenance section beginning on page 88 for more details on servicing Service Access 12 in both sides 8 5 in both sides A Front Access or Front Free Discharge B Control Access Door C Front Free Discharge D Back Louvered Return 3 in 36 in A A C 24 in Fi...

Page 13: ...unit chassis is level CAUTION The unit must be installed level zero tolerance in both horizontal axis for proper operation Failure to do so may result in condensate management problems such as standing water inside the unit Stand ing water and wet surfaces may result in microbial growth mold in the drain pan that may cause unpleasnt odors and serious health related indoor air quality prob lems o 4...

Page 14: ...ctly o 14 Complete all necessary duct connections o 15 Complete all interconnection wiring for the wall mounted fan mode switch or zone sensor per the wiring schematic and guidelines established in the Wall Mounted Control Interconnection Wiring section on page 35 o 16 Install the wall mounted fan mode switch or zone sensor module options properly o 17 Connect electrical supply power according to ...

Page 15: ...l shorts or difficulty in access ing wires Install vertical units in an upright position using the 5 8 inch diameter double key slot hanger holes located on the back of unit The hanger holes allow a maximum shank size of 5 16 inch diameter threaded rods or lag screws installer provides Follow the installation proce dure below 1 Prepare wall openings for recessed units Reference unit submittal for ...

Page 16: ...ligning and locking together the interlocking support channel of the panel and unit While holding the panel against the unit tighten the screws at the top of the panel until it fits tight against the unit s front Do not over tighten the screws CAUTION All unit panels and filters must be in place prior to unit start up Failure to have panels and filters in place may cause motor overload Install hor...

Page 17: ...ructed in the following sections Ensure that the auxiliary drain pan is in position on fan coil units 6 Install the bottom panel before starting the unit 7 Ensure condensate drain line is pitched 1 inch per 10 feet of pipe away from fan coil unit Table 1 Unit Operating Weights pounds kg Unit Cabinet Concealed Recessed Low Vertical Low Vertical Size Models Models Models Cabinet Models Concealed Mod...

Page 18: ... ring hinged end always at the unit s return end Adjust the inner duct of the expansion collar on units with a bottom return to ensure a tight fit against the insulation located on the perimeter of the bottom panel s return louver Safety chain assembly close s hook on each end of chain Insert s hooks through holes in unit and door Close s hook on door Insert retaining screws through bottom panel d...

Page 19: ...UNT IOM 6 19 Figure 5 Trim ring assembly installation ...

Page 20: ...ement on units with a fresh air damper Note Some circumstances may require the unit to run before building construction is complete These operating conditions may be beyond the design parameters of the unit and may adversely affect the unit Startup Checklist Insulate all cold surfaces to prevent condensation Moisture mixed with accumulated dirt and organic matter may create an amplification site f...

Page 21: ... supply and return header locations CAUTION When using a field supplied piping package in a fan coil unit allow sufficient room to install the auxiliary drain pan In addition piping package must not extend over edges of auxiliary drain pan Piping Piping Considerations Units with Hydronic Coil Connections Only Connecting field piping to coil 1 Slide a 1 2 inch sweat connection coupling installer pr...

Page 22: ...t piping connections Install the auxiliary drain pan which ships in the accessory packet CAUTION In all steam coil installations the con densate return connections must be at the low point of the coil to ensure condensate flows freely from the coil at all times Failure to do so may cause physical coil damage from water hammer unequal thermal stresses freeze up and or corrosion 1 Make piping connec...

Page 23: ...ion use the following steps a Locate the steam trap discharge at least 12 inches below the condensate return connection This provides sufficient hydrostatic head pressure to overcome trap losses and ensure complete conden sate removal b Trane Company recommends using flat and thermostatic traps because of gravity drain and continuous discharge operation c Use float and thermostatic traps with atmo...

Page 24: ...1 2 inch diameter line and the fan coil piping connections 1 The factory piping package ships with brackets to adequately support the piping during shipment Remove these brackets before connecting water piping to the unit See Figure 9 2 Close the piping end valves to the fully open position to prevent damage to the valve seat during brazing 3 Remove the auxiliary drain pan if it is in place to pre...

Page 25: ...igure 10 Insert the auxiliary drain pan tabs into these slots in the fan coil chassis end panel Figure 11 The horizontal auxiliary drain pan in its installed position 1 De burr the pipe end before making the connection to the drain pan 2 Connect a 7 8 inch O D copper pipe or tube with a 0 20 inch wall thickness to the auxiliary drain pan This should be a mechanical connection that allows easy remo...

Page 26: ...s with either the Tracer ZN 010 ZN 510 ZN 520 or TUC control have an automatic changeover sensor that determines heating or cooling mode based on the supply water temperature On units with a factory piping package the factory straps the changeover sensor to the piping supply water pipe See Figure 14 on page 27 If the unit does not have a factory piping package the factory at taches the sensor and ...

Page 27: ...ic electric heat lockout switch that disengages the electric heat when hydronic heat enables If the unit has a factory piping package and electric heat the factory attaches the switch to the supply water pipe When the lockout switch detects the supply water temperature above 95 F it disengages the electric heat This eliminates electric heat and hydronic heat working simultaneously If the fan coil ...

Page 28: ... and vent any trapped air at system vents 2 For units with manual air vents back the set screw out to expel air from the unit and then re tighten the set screw The automatic air vent should require no adjustment for the coil to vent However if the coil does not vent immediately unscrew the outer portion of the fitting to expel air from the port If debris has become trapped in the vent completely r...

Page 29: ...odulating valves To manually drive the valve open depress the button stem on top of the valve and push the lever located on the side of the valve to the full open position 2 For presetting use the appropriate valve curve shown in Figure 19 on page 30 to determine which setting is necessary to achieve the appropriate pressure drop 3 Carefully remove the Schrader pressure port connection caps on the...

Page 30: ...ential pressure meter still connected This will divert flow to the bypass side of a 3 way valve Adjust the balancing fitting to obtain the same pressure drop across the circuit setter valve as in step 2 when the control valve was open to the coil Figure 18 Close up view of manual circuit setter valve Figure 19 Setting the manual circuit setter valve differential pressure vs flow ...

Page 31: ...ranges in Table 2 If the pressure drop is not within the ranges listed the valve will not control water flow If the valve orifice becomes clogged with debris remove water from piping and then remove the cap of the valve body and push on the piston to dislodge any foreign matter If this is not successful remove the cartridge and clean Balancing The Auto matic Circuit Setter Valve Figure 20 Automati...

Page 32: ...ed units Install all air ducts according to National Fire Protection Association standards for the Installation of Air Conditioning and Ventilating Systems NFPA 90A and 90B Follow the general recommendations listed below when installing ductwork for the unit Discharge ductwork should run in a straight line unchanged in size or direction for a minimum equivalent distance of 3 fan diameters from the...

Page 33: ...y cause severe personal injury or death Wiring diagrams are attached to the unit in a plastic bag and can be be easily removed for reference Wiring schematics are attached as follows Vertical cabinet recessed units Schematics are on the inside of the front panel See Figure 21 Vertical concealed all horizontal units Locate schematics on the fan and motor panel of unit See Figure 22 CAUTION Use copp...

Page 34: ...etmetal ground Failure to do so may cause electrical shorts resulting in personal injury or death Units have one of three different connection points depending on the unit type and options 1 Power ground inside of control box If the unit has a fan mode switch Tracer ZN 010 or ZN 510 control without a disconnect switch the power leads and capped ground wire are inside the control panel 2 Power grou...

Page 35: ...rnal ground connection The installer must provide interconnection wiring to connect wall mounted devices such as a fan mode switch or zone sensor module Refer to the unit wiring schematic for specific wiring details and point to point wiring connections Dashed lines indicate field wiring on the unit wiring schematics All interconnection wiring must conform to NEC Class 2 wiring requirements and an...

Page 36: ...adiant heat from the sun fireplaces appliances etc Airflow from adjacent zones or other units Unheated or uncooled spaces behind the control such as outside walls or unoccupied spaces Concealed pipes air ducts or chimneys in partition spaces behind the controller The fan mode switch ships loose inside the unit accessory bag Follow the steps below to install the fan mode switch Items needed 2 x 4 e...

Page 37: ...sert and fully seat the plastic anchors c Pull the control wires through the cutout and attach the module to the wall using the screws provided 4 To install the zone sensor module to a standard junction box a Level and install a 2 inch x 4 inch junction box installer supplied vertically on the wall b Pull the control wires through the cutout Attach the module to the wall using the screws provided ...

Page 38: ...e zone sensor entering water temperature sensor and discharge air sensor Wall mounted zone sensor Model Digit 31 W Split mounted option Wall mounted setpoint dial with unit mounted fan mode switch Model Digit 31 X Figure 25 Wall mounted zone sensor dimensions ...

Page 39: ... unit or wall mounted The unit mounted option Digit 31 D operates on line voltage The wall mounted option Digit 31 K is low voltage and has three 24 volt relays using a factory wired transformer and relays to control the fan motor Sequence of Operations Off Fan is turned off two position damper option spring returns closed Hi Med Lo Fan runs continuously at the selected speed The two position damp...

Page 40: ...cer ZN 010 board Sequence of Operations Off Fan is off control valves and fresh air damper option close Low air temperature detection option is still active Auto Fan Cycling Fan and fresh air damper cycle with control valve option to maintain setpoint temperature In cooling mode the fan cycles from off to medium and in heating mode it cycles from off to low When no heating or cooling is required t...

Page 41: ...ze then measures the entering water tempera ture to see if the correct water temperature is available The entering water must be five degrees or more above the space temperature to allow hydronic heating and five degrees or more below the space temperature to allow hydronic cooling If the correct water temperature is available the unit begins normal heating or cooling operation If the measured ent...

Page 42: ...temperature In addition the Tracer ZN 010 and ZN 510 control unit devices as listed below Fan Off Valves Open Electric heat Off Damper Closed Note See the Diagnostics section on page 50 for more information The factory hard wires the condensate overflow sensor to binary input 2 BIP2 on the Tracer ZN 010 and ZN 510 The sensor defaults normally closed N C and will trip off the unit on a condensate o...

Page 43: ...ng and BOP5 is used for heating 2 If no valves are ordered with the unit the factory default for the Tracer ZN 010 and ZN 510 controller are BOP4 configured as normally closed BOP5 configured as normally open 3 If the fresh air damper option is not ordered on the unit BOP6 will be configured as none Binary Outputs Table 5 Occupancy Sensor State Table Sensor Type Sensor Position Unit Occupancy Mode...

Page 44: ...uts Available Analog Input Description Application Zone Space temperature Space temperature detection Set Local setpoint Thumbwheel setpoint Fan Fan mode input Zone sensor fan switch Analog input 1 AI1 Entering water temperature Entering water temperature detection Analog input 2 AI2 Discharge air temperature Discharge air temperature detection Notes 1 The zone sensor entering water temperature se...

Page 45: ...otes 1 During the transition from off to any fan speed but high Tracer ZN 010 and ZN 510 automatically starts the fan on high speed and runs for three seconds before transitioning to the selected speed if it is other than high This provides enough torque to start all fan motors from the off position 2 When the heating output is controlled off ZN 010 and ZN 510 automatically controls the fan on for...

Page 46: ...ler LED on continuously even when power is applied to the controller LED flashes once every second LED Activity Red SERVICE LED Red Service LED Green STATUS LED Yellow COMM LED Description Normal operation Someone is pressing the service button or the controller has failed Use Rover Trane s service tool to restore the unit to normal operation Refer to the Rover product literature for more informat...

Page 47: ...uously Power on normal operation LED blinks once Manual output test mode LED blinks twice Manual output test mode with one or more diagnos tic present LED blinks 1 4 second on 1 4 second off for 10 seconds Wink mode LED off Power off Abnormal condition Test button is pressed Green STATUS LED Note The wink feature allows the identification of a particular controller When sending a request from a de...

Page 48: ...t sequence Although an automatic diagnostic reset sequence exists as part of the controller s normal operation the automatic diagnostic reset feature is not active during the test sequence If left in an individual test step the controller remains in test mode for 60 minutes and then exits to normal operation Many service calls are due to unit diagnostics The test sequence resets unit diagnostics a...

Page 49: ...f step 2 the controller attempts to clear all diagnostics 2 For all 1 heat 1 cool applications including 2 pipe changeover BOP4 energizes in the cooling test stage and BOP5 energizes in the heat test stage This occurs even though during normal 2 pipe changeover operation BOP4 controls the unit valve for both cooling and heating 2 After the Fresh Air Damper step the test sequence performs the Exit ...

Page 50: ... for it to run Disabled End device is not allowed to run even if there is a call for it to run No Action The diagnostic has no affect on the end device Table 14 Controller Diagnostics Diagnostic Latching Fan Valves Elect Heat Damper Yes No Auxiliary No Enabled No action No action No action temp failure Condensate Yes Off Closed Off Closed overflow detection Entering No Enabled Enabled Enabled Enab...

Page 51: ...er to normal operation The controller resumes normal operation until another diagnostic occurs Note The automatic diagnostic reset function does not operate during the manual output test sequence If a special diagnostic occurs within 24 hours after an automatic diagnostic reset the controller must be manually reset Other pos sible methods of resetting diagnostics are described in the sections that...

Page 52: ... 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 device that can communicate alarm reset information can reset diagnostics present in the controller ...

Page 53: ...city according to pulse width modulation PWM logic Fan mode off When using the local fan mode switch to determine the fan operation the off position controls the unit fan to off Requested mode off It is possible to communicate the operating mode such as off heat and cool to the controller When off is communicated to the controller the unit controls the fan to off The unit is not capable of heating...

Page 54: ...s valve operation For more information see the Diagnostics section on page 50 Sampling logic The controller includes entering water temperature sampling logic that automatically invokes during 2 pipe or 4 pipe changeover It determines when the entering water temperature is either too cool or too hot for the desired heating or cooling mode Refer to the Entering Water Temperature Sampling section on...

Page 55: ...iagnostics affects valve operation For more information see the Diagnostics section on page 50 Sampling logic The controller includes entering water temperature sampling logic that automati cally invokes during 2 pipe or 4 pipe changeover to determine if the entering water temperature is correct for the unit operating mode Refer to the Entering Water Temperature Sampling section on page 41 Unit co...

Page 56: ...based on the current step in the test sequence the electric heat may not be on Refer to the Manual Output Test section on page 51 Diagnostic present A specific list of diagnostics affects electric heat operation For more informa tion see the Diagnostics section on page 50 Unit configuration The controller must be properly configured based on the actual installed end devices and application When th...

Page 57: ...es analog and binary output operation and associated output wiring However based on the current step in the test sequence the fresh air damper may not be open Refer to the Manual Output Test section on Page 51 Diagnostic present A specific list of diagnostics effects fresh air damper operation For more information see the Diagnostics section on page 50 Unit configuration The controller must be pro...

Page 58: ...ifies analog and binary output operation and associated wiring However based on the current step in the test sequence the fresh air damper may be open Refer to the Manual Output Test section on page 51 Unit Configuration The controller must be properly configured based on the actual installed end devices and application When the unit configuration does not match the actual end device the damper ma...

Page 59: ...n equivalent capacity The reverse sequence takes place with a decrease in required capacity Low Med High The fan will run continuously at the selected speed and the valve option will cycle to meet setpoint For Tracer ZN 520 controlled units that will interface with the Trane Tracer Summit building management system terminate the commu nication wiring in the control box at the designated terminals ...

Page 60: ...figuration and troubleshoot the unit However control options ordered and the wiring practice followed in the field may limit the communication ability Route interconnecting wiring from the Tracer ZN 520 to provide service communication at the wall mounted zone sensor module Install wiring by referencing the unit wiring diagram and Table 3 on page 35 for appropriate wire sizes After wiring is compl...

Page 61: ...propriate control valve will actuate assuming the following conditions 1 Room temperature should be greater than 55 deg F and less than 85 deg F 2 For a 2 pipe fan coil unit with an automatic changeover sensor the water temperature input is appropriate for the demand placed on the unit For example cooling operation is requested and cold water 5 degrees lower than room tem perature flows into the u...

Page 62: ...tes at 100 If more capacity is needed the supplementary cooling capacity turns on or opens to 100 During the heating mode when the space tempera ture is below the heat setpoint the primary heating capacity turns on All capacity is turned off when the space temperature is between the unoccupied cooling and heating setpoints Note that primary heating or cooling capacity is defined by unit type and w...

Page 63: ... time typically 120 minutes There are four ways to control the controller s occupancy Communicated request usually provided by the building automation system or peer device By pressing the zone sensor s timed override On button Occupancy binary input Default operation of the controller occupied mode A communicated request from a building automation system or another peer controller can change the ...

Page 64: ...by cooling setpoint Unoccupied cooling setpoint The controller uses the measured space temperature the active cooling setpoint and discharge air temperature along with the control algorithm to determine the requested cooling capacity of the unit 0 100 The outputs are controlled based on the unit configuration and the required cooling capacity To maintain space temperature control the Tracer ZN 520...

Page 65: ... raise the discharge air temperature to its low limit The discharge air tempering function enables when cold outdoor air is brought in through the outdoor air damper causing the discharge air to fall below the discharge air temperature control low limit The controller exits the discharge air tempering function when heat capacity has been at 0 for five minutes During heating mode the Tracer ZN 520 ...

Page 66: ...n the unit s supply fan is set to auto the controller s configura tion determines the fan speed when in the occupied mode or occu pied standby mode The fan runs continuously at the configured heating fan speed or cooling fan speed For all fan speed selections except off the fan cycles off during unoccupied mode The economizer outdoor air damper is never used as a source of heating Instead the econ...

Page 67: ...unicated to the controller When both are present the communicated request has priority over the hardwired input See the following tables Table 22 Local fan switch disabled or not present Communicated fan speed input Fan operation Off Off Low Low Medium Medium High High Auto or not present Auto fan runs at the default speed Table 23 Local fan switch enabled Communicated Fan switch local Fan operati...

Page 68: ...f during occupied occupied standby and unoccupied modes when the unit is off due to a diagnostic or when the unit is in the off mode due to the local zone sensor module a communicated request or the default fan speed off If both a zone sensor module and communicated request exist the communicated request has priority Tracer ZN 520 does not support fan cycling in occupied mode The fan cycles betwee...

Page 69: ...entering water temperature sampling function that periodically opens the two way valve to allow temporary water flow producing reliable entering water temperature measurement Only units using the main hydronic coil for both heating and cooling 2 pipe changeover and 4 pipe changeover units use the entering water temperature sampling function Two pipe changeover and 4 pipe changeover applications al...

Page 70: ...the entering water temperature is warmer than 110 F the controller assumes the entering water temperature is hot because it is unlikely the coil would drift to a high temperature unless the actual loop temperature was very high If the entering water temperature is unusable too cool to heat or too warm to cool the controller closes the hydronic valve and waits 60 minutes before initializing another...

Page 71: ...solute dry bulb the controller modulates the outdoor air damper between the active minimum damper position and 100 to control the amount of outdoor air cooling capacity When the outdoor air temperature rises 5 F above the economizer enable point the control ler disables economizing and moves the outdoor air damper back to its predetermined minimum position based on the current occupancy mode or co...

Page 72: ...ool mode fan request space temperature etc to and from other controllers on the commu nication link with or without the existence of a building automation system This applies to applications where multiple unit controllers share a single space temperature sensor for rooms with multiple units but only one zone sensor for both standalone with communica tion wiring between units and building automati...

Page 73: ... and damper Note 2 The occupancy binary input is for standalone unit controllers as an occupied unoccupied input However when the controller receives a communicated occupied unoccupied request the communicated request has priority over the hardwired input Note 3 The generic binary input does not affect unit operation A building automation system reads this input as a generic binary input Note 4 If...

Page 74: ...ve close Note 1 J1 9 Heat valve open or 2 position valve or 1st Electric heat stage Note 1 J1 10 Heat valve close or 2nd Electric heat stage Note 1 J1 11 Fresh air damper open J1 12 Fresh air damper close TB4 1 Generic Bbaseboard heat output TB4 2 24VAC Note 1 For Tracer ZN 520 units configured and applied as 2 pipe hydronic heat cool changeover terminals J1 5 and J1 6 are used to control the prim...

Page 75: ...3 3 Discharge air temperature 40 to 212 F 40 to 100 C J3 4 Analog ground NA Analog Input 3 J3 5 Fresh air temp Generic temp 40 to 212 F 40 to 100 C J3 6 Analog ground NA Analog Input 4 J3 7 Universal Input 0 100 Generic 4 20ma 0 100 Humidity 0 2000ppm CO2 J3 8 Analog ground NA Ground J3 9 Analog ground NA Notes 1 The zone sensor entering water temperature sensor discharge air sensor and the outsid...

Page 76: ...hardwired setpoint adjustment is used to determine the setpoints all unit setpoints are calculated based on the hardwired setpoint value the configured setpoints and the active mode of the controller The hardwired setpoint is used with the controller s occu pancy mode occupied occupied standby or unoccupied the heating or cooling mode the temperature deadband values and the heating and cooling set...

Page 77: ...tch input and uses the com municated value The zone sensor fan switch input can be enabled or disabled through configuration using the Rover service tool If the zone sensor switch is disabled the controller resorts to its stored configu ration default fan speeds for heating and cooling unless the controller receives a communicated fan input When the fan switch is in the off position the controller...

Page 78: ...lso is possible via Rover Trane s service tool Peer to peer communication across controllers is possible even when a building automation system is not present You do not need to observe polarity for Comm5 communication links The controller provides six 0 25 inch quick connect terminals for the Comm5 communication link connections as follows Two terminals for communication to the board Two terminal...

Page 79: ...nabled electric heat Enabled Baseboard heat Enabled CO2 Input failure On Valves Enabled Fresh air damper Enabled electric heat Enabled Baseboard heat Enabled Maintenance required On Valves Enabled Fresh air damper Enabled electric heat Enabled Baseboard heat Enabled Local fan mode failure On Valves Enabled Fresh air damper Enabled Electric Heat Enabled Baseboard heat Enabled Local setpoint failure...

Page 80: ...eneric temperature failure Discharge air low limit 1 Non latching diagnostics automatically reset when the input is present and valid There are six ways to reset unit diagnostics Automatically by the controller By initiating a manual output test at the controller By cycling power to the controller By using a building automation system By using the Rover service tool By using any other communicatin...

Page 81: ...s present at power up and those that occur after power up are handled according to the defined unit diagnostics sequences see previous Diagnostics table Building automation system Some building automation systems can reset diagnostics in the Tracer ZN 520 controller For more complete information refer to the product literature for the building automation system Rover service tool Rover service too...

Page 82: ...c Use Rover service tool to restore normal unit operation Black Service push button Use the Service button to install the Tracer ZN 520 controller in a communication network Caution If the Service push button is held down for more than 15 seconds the Tracer ZN 520 controller will uninstall itself from the ICS communication network and shut down all unit operation This mode is indicated by the red ...

Page 83: ...tion The yellow LED does not blink when the controller is transmitting communication data Table 33 Yellow Comm LED Activity LED activity Description Off continuously The controller is not detecting any communication Normal for standalone applications LED blinks or flickers The controller detects communica tion Normal for communicating applications including data shar ing LED on continuously Abnorm...

Page 84: ...ations network by using Rover Manual Output Test Table 34 Test Sequence Step Fan Main valve Electric heat Fresh Generic or aux valve air baseboard damper heat J1 1 J1 2 J1 3 J1 5 J1 6 J1 9 J1 10 J1 11 J1 12 TB4 1 1 Off 1 Off Off Off Off On Off aux on Off On Off EH off 2 Fan High 2 High Off Off Off Off Off Off Off Off Off 3 Fan Med Off Med Off Off Off Off Off Off Off Off 4 Fan low Off Off Low Off O...

Page 85: ...ion controls the unit off Requested mode off You can communicate a desired operating mode such as off heat and cool to the controller When off is communicated to the controller the unit controls the fan off There is no heating or cooling Diagnostic present A specific list of diagnostics affects fan operation For more information see the Diagnostics section No power to the If the controller does no...

Page 86: ...the unit off and valves to close Sampling logic The controller includes entering water temperature sampling logic which is automatically invoked during 2 pipe and 4 pipe changeover when the entering water temperature is either too cool or too hot for the desired heating or cooling Refer to the Entering Water Temperature Sampling section Diagnostic present A specific list of diagnostic affects valv...

Page 87: ...close The low air temperature detection option is still active Auto Fan speed control in the auto setting allows the modulating three wire floating point control valve option and three speed fan to work cooperatively to meet precise capacity requirements while minimizing fan speed motor energy acoustics and valve position pump energy chilled water reset As the capacity requirement increases at low...

Page 88: ...iring diagram Communication wire must conform to the following specification Shielded twisted pair 18 AWG Capacitance 23 21 25 picofarads pF per foot Listing Rating 300V 150C NEC 725 2 b Class 2 Type CL2P Trane Part No 400 20 28 or equivalent available through Trane BAS Buying Group Accessories catalog Follow these general guidelines when installing communication wiring Maintain a maximum 5000 ft ...

Page 89: ...ing Establish service communication to the TUC by wiring to the low voltage terminal strip inside the control box Reference the unit wiring schematic for the appropriate communication terminals on the low voltage terminal strip Maintain the correct polarity throughout the communication wiring circuit Once wiring is complete use Trane EveryWareä software to commu nicate to the TUC The comm4 connect...

Page 90: ... switches to set the ICS address The address must be in the valid range of 33 to 96 See Table 21 on page 63 for address settings To set the ICS address perform the following steps 1 Set the DIP switches to the correct address ON implies that the DIP switch is pressed towards the DIP switch number OFF implies that the DIP switch is pressed towards the OPEN position 2 Short and hold the test input J...

Page 91: ...3 X X X 42 X X X 74 X X X 43 X X X X 75 X X X X 44 X X X 76 X X X 45 X X X X 77 X X X X 46 X X X X 78 X X X X 47 X X X X X 79 X X X X X 48 X X 80 X X 49 X X X 81 X X X 50 X X X 82 X X X 51 X X X X 83 X X X X 52 X X X 84 X X X 53 X X X X 85 X X X X 54 X X X X 86 X X X X 55 X X X X X 87 X X X X X 56 X X X 88 X X X 57 X X X X 89 X X X X 58 X X X X 90 X X X X 59 X X X X X 91 X X X X X 60 X X X X 92 X ...

Page 92: ...igures as local then Tracer will control the fan regardless of the fan mode switch position All TUC lockouts latching diagnostics are manually reset whenever the fan mode switch is set to the off position or when power is restored to the unit The last diagnostic to occur is retained until the unit power is disconnected Refer to Trane publication EMTX IOP 1 TUC Installation Operation and Programmin...

Page 93: ...position the fresh air damper option and the control valve s operate to maintain setpoint Auto Position As the capacity requirement increases at low fan speed the control valve gradually opens The fan speed increases to medium after reaching the low speed capacity switch point This causes the control valve to reposition to maintain capacity gradually opening as demand increases The fan speed incre...

Page 94: ...pling Function Table 38 Unit Mode as Related to Water Temperature Unit Type EWT Sensor Required Coil Water Temperature 2 pipe changeover Yes Can cool if space temp EWT 5 deg F Can heat if EWT space temp 5 deg F 4 pipe changeover Yes Can cool if space temp EWT 5 deg F Can heat if EWT space temp 5 deg F 2 pipe heating only No Hot water assumed 2 pipe cooling only No Cold water assumed 4 pipe heat co...

Page 95: ...ir It is the installer s responsibility to ensure that the building s minimum fresh air requirements are met while taking necessary precautions to protect the unit during freeze conditions The economizer damper option contains a modulating 3 wire floating point actuator and a damper assembly The factory sets the damper at a minimum 25 percent open position by configuring the TUC This setting is ad...

Page 96: ...perature approaches the occupied heating setpoint If the zone temperature falls 3 F or more below the heating setpoint during the occupied mode the TUC reinitiates the warm up sequence until the zone temperature is within 2 F of the heating setpoint If during the occupied heating mode the TUC determines that no heating capacity is present and the zone temperature drops 3 F below the heating setpoi...

Page 97: ... responsible to adequately protect the unit from freeze conditions Note The capillary line of the low temperature detection sensor is in the section of the hydronic coil above the fan nearest the control panel box Locate the outside air wall box or ductwork so fresh air has a direct path into the fan This allows the sensor to detect an accurate fresh air temperature and proper operation of a dual ...

Page 98: ...e fresh air damper and disables electric heat If the input is configured to send an alarm Tracer will issue a system wide shutdown for the building The unit will continue to run and no diagnostic will register within the TUC The factory configures the 24V dry contact input as normally closed However it can also be normally open if using the correct switch The unit can operate in the occupied unocc...

Page 99: ...s 2 Set the TUC DIP switch 7 to ON address 2 All other switches should be off 3 To automatically cycle through the stages short and hold the TUC test input short J11 and J12 together Continue holding the test input and the unit will cycle to each subsequent stage every 30 seconds 4 To manually step between stages momentarily short the test input to advance to the next test stage 5 When the autocyc...

Page 100: ... l Fan low speed 2 l Fan medium speed 3 l l Fan high speed 4 l Economizer damper 5 l l Coolingvalve 6 l l Heatingvalve 7 l l l Electric heat stage 1 8 l Electric heat stage 2 9 l l Not used 10 l l Reheat 11 l l l Not used 12 l l Not used 13 l l l Not used 14 l l l Not used 15 Not used 1 l the LED is illuminated the LED is off ...

Page 101: ... one second Sequence 2 LED 5 will light to indicate that sequence 2 is currently being displayed LEDs one through four will display the first part of the diagnostic code Sequence 3 LED 6 will light to indicate that sequence 3 is currently being displayed LEDs one through four will display the second part of the diagnostic code 5 Refer to Table 24 on page 74 to interpret the blink sequences corresp...

Page 102: ...ence 3 is currently being displayed LEDs one through four will display the second part of the operating machine state 5 Reference Table 25 on page 75 to interpret the operating machine state derived from the blink sequences Table 40 Blink Sequence Corresponding Diagnostic Codes Sequence 1 Sequence 2 Sequence 3 1 2 3 4 1 2 3 4 1 2 3 4 Code Diagnostic Latch None Power failure None None Controller fa...

Page 103: ...ibration l l 12 Latching Diagnostic l l l 14 Freeze Shutdown l 16 Soft Reset l 18 Standby l l 20 Cooling l l l 22 Heating 6 Read and record the operating machine state Return the DIP switches to the initial positions recorded in step 1 Short the test inputs to set the address in the TUC EEPROM Example Operating Machine State for Standby Mode Sequence 1 Sequence 2 Sequence 3 1 2 3 4 1 2 3 4 1 2 3 4...

Page 104: ...LEDs go off for one second Sequence 2 LED 5 will light to indicate that sequence 2 is currently displayed LEDs one through four will display the first part of the operating control mode Sequence 3 LED 6 will light to indicate that sequence 3 is currently being displayed LEDs one through four will display the second part of the operating control mode 5 Refer to Table 26 on page 77 to interpret the ...

Page 105: ...tering water temp The TUC cannot meet the demand There is no other capacity available l 4 Tracer The TUC received a Tracer Override verride Follow Tracer output commands l 8 Precool Unoccupied cooling with economizer or water occupied cooling feasibility check l l 10 Precool Unoccupied cooling with EWT economizer while purging for sampling cold water l l 12 Precool Unoccupied cooling with 100 cool...

Page 106: ...g for hot water l l l 26 Preheat Unoccupied heating with electric 100 hot water main or heat auxiliary or with electric heat augmentation Or unoccupied heating with 100 main coil hot water with auxiliary coil hot water augmentation l l l 28 Heat Occupied heating with hot water main or auxiliary coil l l l l 30 Electric Occupied heating with heat electric heat l 32 Heat Electric heat available elec...

Page 107: ...the condensate overflow sensor There are five ways in which diagnostics are reset 1 Using the zone sensor 2 Using Everyware Trane s TUC service tool 3 By cycling power to the TUC 4 Through Tracer 100iä or 100Lä 5 Through Tracer Summit Using the zone sensor s fan mode switch to reset diagnostics slide the fan mode switch to the off position Then return the switch back to any position except off Con...

Page 108: ...the unit diagnostics with the reset diagnostics button on the TUC editor screen The unit s operating machine state is in standby when one of the following conditions occurs 1 Tracer override is present 2 During the power up sequence or any time when the TUC is calibrating its end devices 3 When the TUC is in the unoccupied mode and there is no call for heating or cooling 4 In the occupied mode whe...

Page 109: ...abled the power up control wait feature delays the TUC startup for two minutes after power up This delay allows the Tracer system ample time to communicate its fan control request Cycling fan operation When configured to cycle with capacity the unit fan cycles off when there is no call for heating or cooling The heating cooling sources cycle on or off periodically with the unit fan to match the ca...

Page 110: ...alls below the freeze avoidance setpoint configurable If the fresh air temperature falls below the freeze avoidance setpoint the valves open The TUC enables freeze avoidance whenever the freeze avoidance setpoint is not zero Override present The valves may be overridden to the closed position by either the Tracer system or by Everyware software Whenever any override is active the TUC drives the va...

Page 111: ...ting point the valve s may not operate properly FreezeAvoidance When freeze avoidance is enabled active only during stop modes the TUC controls the valve s open whenever the fresh air tempera ture is less than the freeze avoidance setpoint configurable If the freeze avoidance setpoint is zero this feature is disabled Wiring The wiring between the controller outputs and the valve s must be present ...

Page 112: ...ics affects electric heat operation For more information see the Diagnostics section on page 73 Latching diagnostics require a manual reset to restore normal unit operation Autocycle Test The controller includes an autocycle test sequence that verifies analog and binary output operation and associated output wiring However based on the current stage in the test sequence the electric heat may be di...

Page 113: ...est The controller includes an autocycle test sequence that verifies analog and binary output operation and associated output wiring However the current test sequence stage may require the damper to close Refer to the Autocycle Test section on page 71 Unit Configuration The TUC cannot control fresh air damper outputs if the unit is config ured for no fresh air damper Also if the fresh air damper i...

Page 114: ...age 71 Unit Configuration The TUC cannot control fresh air damper outputs if the unit is configured for no fresh air damper Also if the fresh air damper type is incorrectly configured on off modulating analog or 3 wire floating point it may not operate properly Wiring The wiring between the controller outputs and the fresh air damper must be present and correct for normal damper operation Refer to...

Page 115: ...oftware to determine which source is sending the setpoint Wiring Verify the wiring of all end devices such as valves and dampers Use the manual overrides or the autocycle test to verify the operation of these end devices Manual Cool Mode If the Tracer system places the TUC in manual cool mode the TUC Sent by Tracer cannot switch to heat mode and therefore cannot provide heating to the zone Locatio...

Page 116: ...ally to be sure movement is not blocked by obstructions 3 Inspect the coil fins for excessive dirt or damage Remove dirt and straighten fins 4 Clean and tighten all electrical connections 5 Inspect the strainer option for debris trapped in the filter screen Change or clean air filters at least twice a year Filters require more frequent care under high load or dirty air conditions since a clogged f...

Page 117: ... 91 12 1 x 8 875 x 61 125 1 x 5 5 x 61 38 2 54 x 23 x 155 2 54 x 13 97 x 155 91 Note Vertical recessed horizontal cabinet horizontal recessed units with a bottom return have filter guides to secure the filter in position Also if these unit types have a fresh air opening they require an additional filter for the fresh air opening 2 Pull the two plunger spring pins inward on the filter access door a...

Page 118: ...ith a minimum efficiency of 99 97 at 0 3 micron particle size 5 Thoroughly clean the contaminated area s with a mild bleach and water solution or an EPA approved sanitizer specifically designed for HVAC use Carefully follow the sanitizer manufacturer s instructions regarding the use of the product 6 Immediately rinse the drain pan thoroughly with fresh water to prevent potential corrosion from the...

Page 119: ...nting slots in the chassis end panel and remove pan from unit See Figure 31 CAUTION Exercise extreme care when removing auxiliary drain pan Failure to do so may cause plastic mounting tabs to break Note When replacing the main drain pan install it correctly under the z bar as pictured in Figure 32 Auxiliary Drain Pan Figure 32 When replacing the fan coil s main drain pan install it correctly under...

Page 120: ...visions to ensure adequate protection against coil freeze up If the fan coil units are not in operation the coil s should be vented at the factory vent s and drained at the piping system drain port s See Table 38 on page 94 for approximate piping package volumes for piping systems using ethylene glycol Table 39 on page 94 lists approximate hydronic coil volumes It is necessary to properly prepare ...

Page 121: ...protective equipment PPE 3 Gain access to the both sides of the unit coil section 4 Use a soft brush to remove loose debris from both sides of the coil 5 Use a steam cleaning machine starting from the top of the coil and working downward Clean the leaving air side of the coil first then the entering air side Use a block off to prevent steam from blowing through the coil and into a dry section of t...

Page 122: ...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 Total Rows Volume Table 54 Factory Piping Package Volumes oz mL Piping Package Volume Main coil 6 178 Auxiliary coil 12 355 Table 55 Hydronic Coil Volumes Heating Cooling gal ...

Page 123: ... 99 for further information Inspect the equipment a minimum of every six months or more frequently if operating experience dictates When accumulated dirt and other organic matter is exposed to water or extended periods of high relative humidity 60 or higher may support microbial growth an indoor air quality contaminant source If evidence of contamination exists in either the wet or dry sections ta...

Page 124: ...eaning fan surfaces 1 Disconnect all electrical power to the unit 2 Don the appropriate personal protective equipment PPE 3 Use a portable vacuum with HEPA filtration to remove loose dirt and organic matter The filter should be 99 97 efficient at 0 3 micron particle size 4 If no microbial growth mold exists thoroughly clean the fan and associated components with an industrial cleaning solution Car...

Page 125: ...ervice 8 Do not allow any contaminated material to contact other areas of the unit or building Properly dispose of all contaminated materials and cleaning solution If microbial growth mold is present determine the cause of the contamination and take action to prevent reoccurance ...

Page 126: ...he instructions given under the drain pan section above for horizontal fan coil units 3 While supporting the fanboard in place remove the two fanboard mounting screws which secure the fanboard to the unit CAUTION Support the fanboard when removing it from the unit Failure to do so may cause personal injury The capacitor for all unit motors can be replaced should it fail Contact the local Trane ser...

Page 127: ...vices differential pressure switches sensors control valves and actuators contact the local Trane Service Parts Center To order the Trane parts center will need the unit model number which can be found on the unit nameplate the serial number and the part name or ID Control Device Replacement Table 56 Trouble Shooting Problem Possible Cause Remedy Drain pan is overflowing Plugged drain line Clean d...

Page 128: ...128 UNT IOM 6 Appendix Factory Piping Packages Automatic Circuit Setter C ...

Page 129: ...ic unit Fan Mode Switch Typical Wiring Diagram For Reference Only This schematic shows typical wiring of a fan coil It is not intended for a basis of design or for equipment installation purposes in the field For an as built schematic specific to a particular unit please see the ship with schematic for that specific unit Two pipe unit without control valve Fan mode switch option K Wall mounted mod...

Page 130: ...E WITH THE NATIONAL ELECTRIC CODE NEC STATE AND LOCAL REQUIREMENTS DEVICE PREFIX LOCATION GUIDE AREA LOCATION 1 CONTROL PANEL 2 CONTROL END 3 PIPING END 4 FAN SECTION 5 COIL SECTION 6 CUSTOMER For Reference Only This schematic shows typical wiring of a fan coil It is not intended for a basis of design or for equipment installation purposes in the field For an as built schematic specific to a parti...

Page 131: ...DOWN HAS OCCURRED 2 DASHED LINES INDICATE RECOMMENDED FIELD WIRING BY OTHERS DASHED LINE ENCLOSURES AND OR DASHED DEVICE OUTLINES INDICATE COMPONENTS PROVIDED BY THE FIELD SOLID LINES INDICATE WIRING BY TRANE CO 3 NUMBERS ALONG THE RIGHT SIDE OF THE SCHEMATIC DESIGNATE THE LOCATION OF CONTACTS BY LINE NUMBER AN UNDERLINED NUMBER INDICATES A NORMALLY CLOSED CONTACT 4 ALL FIELD WIRING MUST BE IN ACC...

Page 132: ...AND AFTER A NORMAL SHUTDOWN HAS OCCURRED 2 DASHED LINES INDICATE RECOMMENDED FIELD WIRING BY OTHERS DASHED LINE ENCLOSURES AND OR DASHED DEVICE OUTLINES INDICATE COMPONENTS PROVIDED BY THE FIELD SOLID LINES INDICATE WIRING BY TRANE CO 3 NUMBERS ALONG THE RIGHT SIDE OF THE SCHEMATIC DESIGNATE THE LOCATION OF CONTACTS BY LINE NUMBER AN UNDERLINED NUMBER INDICATES A NORMALLY CLOSED CONTACT 4 ALL FIEL...

Page 133: ...ield For an as built schematic specific to a particular unit please see the ship with schematic for that specific unit or contact your local Trane representative Two pipe unit with a modulating valve Electric heat terminal unit controller Wall mounted zone sensor off auto high med low Disconnect switch Automatic two position fresh air damper Low temperature detection Condensate overflow detection ...

Page 134: ...field For an as built schematic specific to a particular unit please see the ship with schematic for that specific unit or contact your local Trane representative Four pipe unit with control valves both modulating terminal unit controller Wall mounted zone sensor off auto high med low Disconnect switch Automatic two position fresh air damper Low temperature detection Condensate overflow detection ...

Page 135: ...UNT IOM 6 135 ...

Page 136: ... trane com An American Standard Company Literature Order Number UNT IOM 6 File Number PL TD UNT IOM 6 4 00 Supersedes UNT IOM 5 Stocking Location LaCrosse Since The Trane Company has a policy of continuous product improvement it reserves the right to change design and specifications without notice ...

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