AINSTALLATION, OPERATION

AND MAINTENANCE MANUALFOR

C-TRAC3COOLING CONTROLLER

UNIT MODEL NO. _________________UNIT SERIAL NO. _________________SERVICED BY: ___________________TEL. NO: ________________________

CANADIANHEAD OFFICEAND FACTORY

USAHEAD OFFICEAND FACTORY

CANADIANEASTERN FACTORY

1401 HASTINGS CRES. SECALGARY, ALBERTA

T2G 4C8Ph: (403) 287-4774Fx: 888-364-2727

32050 W. 83rd STREETDESOTO, KANSAS

66018Ph: (913) 583-3181Fx: (913) 583-1406

1175 TWINNEY DRIVENEWMARKET, ONTARIO

L3Y 5V7Ph: (905) 898-1114Fx: (905) 898-7244

SALES OFFICES ACROSS CANADA AND USA

Retain instructions with unit and maintain in a legible condition.Please give model number and serial number when contacting

factory for information and/or parts.

www.engineeredair.com

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C-TRACModel 3.2

If any errors or omissions are noted please contact Wade Pascoe at (403) 287-4775 or Fax(403) 287-4799 or (403) 243-5059.

To ensure warranty is honored, only a qualified HVAC service person, who has received trainingon the C-TRAC3, should be employed for service and troubleshooting. If further information isrequired please contact the nearest Engineered Air office.

Any reference to C-TRAC or C-TRAC3.x in this manual refers to the same family of controls.Changes from version to version are recorded on the table at the back of the manual and thechanges are noted by modifying the last digits. Example a minor change will change the numberto the right of the decimal such as 3.1 updates to 3.2. If there is a major physical change to theboard it will be reflected in change of the number to the left of the decimal – (thus in the futurethere will be a C-TRAC4). The C-TRAC3 was released in 2003 and is the latest update to the C-TRAC family of controls by Engineered Air. The C-TRAC3 family has many added features aswell as improved control capability over its predecessors.

Under no conditions (except for temporary copying) should the unit function be removedfrom the unit. There are two copies provided with the unit. One is in an envelope for copying,then return it to the unit or store in a safe place. The other is attached to the control panel doorand should never be removed. If a copy of the function for a particular unit is needed, record theunit serial number, C-TRAC3 model number (ex model C-TRAC3.2) and record the C-TRAC3’sprogram number from under the model number (top right corner). Then contact the nearestEngineered Air Factory for a copy.

Warning: This unit is connected to high voltages. Electrical shock or death couldoccur if instructions are not followed. This equipment contains movingparts that may start unexpectedly. All work should be performed by aqualified technician. Always disconnect power before servicing. DO NOTbypass any interlock or safety switches under any circumstances.

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Table of Contents

INTRODUCTION .........................................................................................................4

TEMPERATURE CONTROL ............................................................................................5

SENSOR #2............................................................................................................5AUXILARY SETPOINT ...............................................................................................5

OPERATION...............................................................................................................6

AMBIENT SENSING..................................................................................................6BLOWER CONTROL ..................................................................................................6DAMPER/ECONOMIZER CONTROL..............................................................................6

Minimum Position .................................................................................................7Ambient Compensation .........................................................................................7

HEATING CONTROL .................................................................................................8COOLING CONTROL.................................................................................................8OCCUPIED/UNOCCUPIED..........................................................................................8

INDICATION AND DIAGNOSTIC LIGHTS ........................................................................9

LOW LIMIT ..............................................................................................................10

VARIABLE AIR VOLUME.............................................................................................11

WIRING ..................................................................................................................11

TROUBLE SHOOTING................................................................................................12

BASIC (MULTIMETER) ............................................................................................12DIP Switches (C-TRAC 3.2 and higher) ..................................................................12Simulating a heat/cool call...................................................................................13

ENCHANCED (COMPUTER/PDA) ...............................................................................13Calibration .........................................................................................................14

SENSOR TABLES ......................................................................................................15

VARIATIONS ON THE C-TRAC3 ..................................................................................16

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INTRODUCTION

The CTRAC-3 is a configurable microprocessor based controller designed to be theprimary controller of Engineered Air heating, ventilation, and cooling equipment.The ability to meet the demands of a wide variety of specific and customrequirements is the hallmark of Engineered Air. As such, the CTRAC-3 was createdto accomplish this versatility, while at the same time, maintaining simplicity andease of operation.

Similar in operation to its previous version, the CTRAC-3 is designed toindependently control the cooling, heating, and mixing economizer. Additionally, itallows for control of other types of equipment operations such as multi-zone anddehumidification. To avoid having multiple versions, all of the base configurationsare stored in the C-TRAC3, and are recalled and activated to suit the application.

The program number noted on the face of the C-TRAC3. This is important whencontacting the factory about the unit operation, or for replacement parts. Thisnumber should accompany the unit serial number and model number.

The CTRAC-3 uses industry standard PI (proportional integral) control algorithms.Additionally, in the control loop, it incorporates an advanced artificial intelligencetechnology called fuzzy logic. The combination of the two make for impressivetemperature control and equipment stability.

This information in this manual should be used in conjunction with the unit functionsheet(s) and the terminal designation list that accompanied the equipment.

The C-TRAC3 is designed to control Engineered Air equipment only. It isnot designed to simulate or copy other controllers on the market today,nor can it be modified to do so.

Note: It is necessary that all of the remote control wiring be complete andoperational before starting the unit.

It is important that the service technician understands the C-TRAC3 is aconfigurable controller. While the terminal designation remains the same,the operation of the terminal is dependent on the required function, andmay differ from unit to unit.

The C-TRAC3 is not field programmable. If the C-TRAC3 program becomesdamaged or corrupted, it must replaced or returned to Engineered Air forre-programming.

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TEMPERATURE CONTROL

The C-TRAC3 is a discharge air temperature controller. The base discharge airtemperature setpoint is typically set from the control knob located on the face ofthe C-TRAC3. Optionally, this setpoint may be remote mounted, or directly setfrom a remote BMS signal (0-10Vdc). If not used, set this knob to maximum (fullyclockwise). Refer to the wiring diagram and function.

The discharge air temperature is normally modified from a remote signal tomaintain a comfortable temperature in the space. This is called reset. The C-TRAC3discharge temperature can be reset from a variety of sources such as ambient airtemperature, modulating or staged room thermostats, return air temperature, or aBMS signal (0-10Vdc). The resulting change in the discharge temperature setpointfrom reset is called the calculated discharge air temperature setpoint, or SPC.

Mode change time (from heat mode, to economizer mode, to mechanical coolingmode) is usually five minutes (six minutes from heat to mechanical cooling if thereis no economizer). If the C-TRAC3 does not satisfy the SPC in its present mode andthe discharge temperature slips outside of the discharge temperature dead bandthen it will begin timing for a mode change. If the timing has completed, it canchange modes when needed. If the timer is active and the discharge temperatureslides back into the dead band, the mode change timer is reset to zero. If thecurrent mode becomes disabled (ex cool mode and A has no power) the C-TRAC3moves into the next mode (In this case economizer). If no modes are available thesupply blower will shut off (optional).

The C-TRAC3 will not always be able to maintain the SPC exactly. Enabling acooling compressor, for example, may cause the discharge temperature to fallbelow the SPC. When the compressor is disabled the temperature may rise abovethe setpoint. On average, however, the discharge temperature will closely matchthe SPC.

The C-TRAC3 controls to a +/-2°F deadband of the SPC.

SENSOR #2

The C-TRAC3 is capable of using, and controlling to, two sensors. Largerequipment can incorporate 2 discharge air sensors for improved temperaturecontrol. Multi-zone equipment use sensor #1 for the hot deck, and sensor #2 forthe cold deck. Reheat (dehumidification) equipment use sensor #1 for the reheat(leaving) section, and sensor #2 for the pre-cool section.

AUXILARY SETPOINT

Set point #2 is configurable with a scale 50 to 100°F. This knob is active in someconfigurations to control with sensor #2. Other configurations may use it, forexample, as room / return air set point. If not used, set this knob to maximum(fully clockwise).

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OPERATION

As the C-TRAC3 is configurable and will vary in its operation unit to unit, it isimperative that the unit function, terminal designation sheet and wiring diagram bereviewed to understand how the control is operating for each particular application.

All of the remote wired options must be wired and functional beforeattempting to start the unit.

AMBIENT SENSING

The C-TRAC3 constantly monitors the ambient temperature using an Engineered AirTE6000EA3 sensor. On initial start up the C-TRAC3 pre-determines which mode tostart in: heating, cooling, or economizer. The load requirements and the ambienttemperature determine this. Note that some applications will involve dual modes,such as dehumidification and multi-zone equipment. The C-TRAC3 must have anambient sensor installed to operate, or it will lockout on ‘open sensor’ failure.

BLOWER CONTROL

When 24Vac is applied to terminal FS the C-TRAC3 is considered to be in occupiedmode. After a time delay to allow the dampers to open, the blower(s) will beenabled by closing the contact between terminals C and SA. The time delay isvariable depending on the equipment and the function. If the equipment has gasfired heating and the C-TRAC3 is calling for heat on start up, the time delay willinclude pre-purge and heat exchanger warm up time.

Fan start and damper opening timing will change depending on the unitconfiguration. Make up air equipment has a base delay time of 90s, whileequipment with mixing dampers only have a 10s delay time. Additionally, there aredelays for morning warm up, cool down, and pump down, some of which varydepending on the ambient temperature. Refer to the unit function for specificapplication time values. The fan delay off time can vary from 10s to 2.5 minutes.

DAMPER/ECONOMIZER CONTROL

The C-TRAC3 has 2 independent outputs for damper control. One is a 24Vac outputfrom terminal DM for on/off control or a 2 position damper actuator, the other is a0-10Vdc output from terminal ED for modulating (economizer) actuator control.

The mixed air is usually controlled by the C-TRAC3 but be aware that mixed air maybe under the control of another device, such as a building static pressure sensor orCO sensor. Refer to the unit function and wiring diagram to clarify. If used, this isconsidered a “flow through” device that would input to the C-TRAC3 first, which inturn outputs to the dampers.

C-TRAC3 controlled mixed air will modulate the mixing dampers to maintain theSPC. The C-TRAC3 will drive the actuator to minimum position when in heating orcooling mode.

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Terminal E will typically be connected to an optional high enthalpy control. If inputterminal E is powered (24Vac), the modulating output signal will drop to theminimum outside air position setting. High enthalpy control is used when themoisture content in the air is too great and it is more economical to cool morereturn air rather than outside air.

Refer to the variable air volume section for more information.

Minimum Position

To understand the minimum position operation, first refer to the unit function.

To avoid low limit failure, if the discharge approaches the low limit setpoint(typically 40°F) the C-TRAC3 will try and keep the unit operational by decreasingthe minimum outside air position up to ½ of its original or pre-programmedsetpoint.

Single Volume

The minimum position pot is accessible through the cover of the C-TRAC3. Thesetting for the minimum position of the mixing box fresh air dampers is on the unitfunction. The usual industry standard setting for the minimum amount of outsideair is 15%. This can also be set with a computer or PDA.

There may be an optional remote mounted minimum position pot or 0-10Vdc BMSsignal specified (and therefore programmed) into the C-TRAC3 operation. It wouldnormally be wired into terminal MP.

Variable or dual volume

Variable air volume includes Variable Frequency Drives, Coyote, inlet vanes and 2speed motors. The input signal to these drives also feed into the MP terminal.

If the C-TRAC3 is configured for the variable air option (VFD, Coyote, inlet vanes)the minimum position can only be adjusted with a PDA or computer. The minimumposition pot should be sealed at the fully counter-clockwise position, as the inputwill interfere with the VFD minimum speed setting. When a VFD is used with the C-TRAC3 the minimum position is factory pre-programmed. This can only be modifiedwith a computer or PDA.

Ambient Compensation

Makeup air equipment normally uses a 2 position damper actuator. Optionally, amodulating outside air actuator can be used. The modulating economizer output(ED) will vary depending on the ambient temperature. As the ambient temperaturefalls, the output will decrease proportionally. This is referred to as ambientcompensation, and accounts for the thermal expansion of the air as it is heated.

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HEATING CONTROL

Heating is allowed to operate if terminal HS is powered (24Vac). The heating isonly activated when the C-TRAC3 is in heat or dual mode. The C-TRAC3 has a setof contacts (terminals

HE1 and HE2) that will close to enable a heating source, as well as a modulating (0-10Vdc typically) output from terminal HD to control an independent heatingcontroller, SCR, or water/steam valve. Typically this output will drive one of theEngineered Air heating controllers (G-TRAC, DJM, H-TRAC etc). Refer to theappropriate manual for additional information on these controls.

COOLING CONTROL

Cooling mode is allowed if terminal A is powered (24Vac). The cooling is onlyactivated when the C-TRAC3 is in cool or dual mode. The C-TRAC3 has 5 outputcontacts (1 to 5) to enable mechanical cooling stages.

Additionally, a modulating (0-10Vdc, 10Vdc=max. cool) output is available fromterminal CD for control of a modulating style of compressor or cooling valveactuator.

Terminal CF is an ambient based cooling output (24Vac). If the first cooling stageis enabled, and the ambient temperature is above the pre-selected setpoint, thiscontact will close. Typical applications for this would be for an ambient basedcondenser fan, or compressor.

Compressor inter-stage, and minimum on/off times are from 5 to 8 minutesdepending on operating conditions. Note that if conditions at start-up allow startingin the mechanical cooling mode the first compressor could start in as short as 2 ½minutes.

Terminal AMB is wired to an externally mount ambient sensor (Engineered AirTE6000-EA3). The C-TRAC3 uses this sensor to perform multiple functions, such aslow ambient compressor lockout, high ambient set back, and mode control. Referto the unit function to understand the options for each application.

OCCUPIED/UNOCCUPIED

The C-TRAC3 is capable of a wide variety of control options for occupied/unoccupiedcontrol. Read the unit function and wiring diagram carefully to understand theparticular application. The mixing dampers will set to 100% return air. This optionis not available on make up air equipment.

The C-TRAC3 is capable of unoccupied heating and in some configurations,unoccupied cooling. Additionally, fan control may be continuous or intermittent.

An independent unoccupied thermostat is required if the unit does not have anymethod of temperature reset. Normally the modulating room reset sensor (or BMS

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0-10Vdc reset signal) is used, with the unoccupied setback temperature pre-programmed.

INDICATION AND DIAGNOSTIC LIGHTS

On the face of the C-TRAC3 are 3 small lights, coloured green, yellow, and red.The green light is to indicate the C-TRAC3 is powered and ready for operation. Ifpower (24Vac) is applied to terminals H and N, and the light is not on, the C-TRAC3may be faulty and/or the fuse is blown. The yellow light indicates mode and blowerdelay. The red will indicate problems and failures.

The yellow and red lights will flash on and off a number of times for indication. Anoticeable pause occurs between sets of flashes to avoid confusion. It is not therate of flashes, but he number of flashes. Refer to the table listed on the face ofthe C-TRAC3 or the table below.

# ofFlashes

Yellow LED Red LED

1 Heat Mode Temperature outside deadband

2 Economizer Mode Mode change blocked3 Cool Mode Cooling mode blocked4 Dual Mode Low Limit5 No Mode Open Sensor6 Blower Delay Heat Fail7 Compressor(s) Disabled MPU Error

Heat Mode will flash 1x when the C-TRAC3 is in this mode will be closed. The HE1and HE2 contacts and the modulating output will react based on the heatingdemand. It is possible to be in heat mode, with no heating occurring.

Economizer Mode flashes when the C-TRAC3 is in this mode the modulatingoutput from terminal ED can rise above the minimum position to modulate themixing dampers and maintain the required discharge air temperature.

Cooling Mode indicates the mechanical cooling staged output contacts areavailable to control the mechanical cooling stages. All stages have minimum runtime, minimum off time, and inter-stage timing. As well, there may be an optionalchoice of a modulating cooling output signal if a modulating compressor or otherdevice such as a modulating chilled water coil is desired.

Dual Mode is a function used on equipment where the heating mode and thecooling or economizer modes operate at the same time with independent set points.Ex multi-zone applications, or de-humidification functions.

No Mode will flash when the C-TRAC3 is not allowed to run the heating (HS notpowered), cooling (A not powered) or economizer (E powered). This generallyoccurs because of external controls, ambient lockout, flame failure, etc. The C-TRAC3 can be preprogrammed to eliminate certain modes. For example a makeupair unit does not have an economizer mode.

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Blower Delay is to indicate the blower is preparing to start, but has internal timersto allow for the dampers to open, or to warm up the heat exchanger.

Compressor Disabled refers to the mechanical cooling being disabled by the SMCsoftware.

Temperature outside dead band means the temperature is no longer at setpointand the C-TRAC3 is attempting to resolve the error.

Mode Change Blocked indicates the C-TRAC3 wishes to change modes (execonomizer to cooling) but the mode is blocked due to an external signal control.

Cooling Mode Blocked indicates the mechanical cooling mode is disabled fromeither low ambient temperatures or terminal A not being powered.

Low Limit will flash when the unit has failed because of low dischargetemperature, usually associated with flame failure.

Open Sensor will blink if one of the sensors has failed open.

Heat Fail will flash if the gas fired heater has failed to ignite. The C-TRAC3monitors the burner operation with terminals PVE (pilot valve) and FRE (flamerelay), and can be configured to shut down and lock out the system on a flamefailure. Some heaters may be configured for automatic re-light up to 3x before theC-TRAC3 will go into heat fail.

MPU Error indicated a failure in the main processor. The C-TRAC3 must bereplaced. Consult factory.

LOW LIMIT

The C-TRAC3 control may have low limit (freeze) protection included. Refer to theunit function to confirm if the C-TRAC3 is configured with a low limit, and what arethe setpoint and bypass time values. To reset the control after a low limit trip theC-TRAC3 must have the power removed and restored to terminals H and N. This isusually done by turning the unit off at the service switch located inside of thecontrol cabinet. A PDA can also command the C-TRAC3 to reset the low limitalarm.

On initial start-up the C-TRAC3 will bypass low limit sensing for a pre-set amount oftime, determined by the size and type of heat exchanger.

Low limit bypass time will vary depending on the type of heating equipment beingused. Refer to the unit function for this value if the low limit option was selected.(The nominal value will usually vary between 3 and 7 minutes).

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VARIABLE AIR VOLUME

Variable air volume and 2 speed systems change the amount of air being moved bythe system using a variety of means. The C-TRAC3 can accept the same signal thatcontrols the VAV, wired in parallel to terminals MP and Z (0-10Vdc). This signaltells the C-TRAC3 that a change in air volume is about to occur. The C-TRAC3 canthen adjust the temperature control according to the change in the air volumesignal. For example, on a decrease in airflow, the C-TRAC3 will force compressorsoff sooner than it normally would, to avoid possible damage to the refrigerationcomponents. Reduced airflow would also limit the number of cooling stages thatcould operate. A sudden volume change will also affect the heating control. Theheating ramp responds more quickly to increase the heating output on an increasein air volume. Additionally, the internal low limit bypass time is reset on a suddenincrease in air volume.

The control signal feeding the VFD and CTRAC-3 is a 0-10Vdc signal correspondingto the range of operation of the VFD. For example, if the VFD speed varies from 35to 100%, this is also the range of the 0-10Vdc control signal. The CTRAC-3 willassume that at 0Vdc input, the VFD is operating at 35% speed. External controlsare required to disable mechanical cooling below the minimum speed.

WIRING

The C-TRAC3 terminals H and N require a minimum 24 Vac, 40 VA class 2 powersupply that does not need to be isolated from the rest of the systems components.The C-TRAC3 incorporates an internal ½ wave rectified power supply that has theDC common virtually the same as the AC’s neutral supply (within 0.05Vdc).

Terminal N should be wired to the common of the same source supplying power toterminals E, A, and K. All remote wiring attached to terminals Q, U, X, Y, V, Z, +and - should be installed in a clean (no electrical noise) environment. Wire sizeshould be a minimum of 24ga. twisted pair to reduce electrical noise (shielded wireis best). For longer runs (over 50 ft. eq. length), the use of a minimum 20 gauge-shielded wire is recommended. The shield should be grounded at the unit end only,with the other end taped.

It is important to ensure correct polarity when wiring into the system.

The modulating output signals from the C-TRAC3 can be programmed for othervoltage ranges if needed for operating other controls. The minimum load resistanceis 500 Ohms.

The possible variable voltage ramps are:0 – 10 VDC0 – 7 VDC0 – 5 VDC0 – 2 VDC

As noted, these are configured values and the selected value is noted on thefunction.

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If the BMS input terminals (+ and -) are included as part of the unit function andare not field wired, the signal is considered as being zero, therefore the control willoperate as described when this signal is low (ex maximum cooling).

TROUBLE SHOOTING

The C-TRAC3 is designed to simplify service and troubleshooting. Most equipmentfailures and problems occur due to sources external to the C-TRAC3, and can easilybe traced with a digital multimeter. Advanced troubleshooting will require the useof a computer or PDA (enhanced).

BASIC (MULTIMETER)

The unit has a function and terminal list attached to the electrical panel door.These explain how this piece of equipment is designed to operate. This information,along with the flashing patterns from the C-TRAC3 status lights and multimeterreadings should allow most troubleshooting to effectively take place.

Do not jumper or open circuit sensors. If necessary it is possible to substitute fixedor variable resistors in place of the sensors for test purposes. Refer to the tablelater in this document for various sensor values at various temperatures.

There is a test point to the right of the RS-232 connection. From either of thesepoints (referenced to ground) measure a DC voltage that relates to temperature in°C.

Example 1.8Vdc = 18 °C

Vdc 0.5 1.0 1.3 1.56 1.83 2.1 2.4 2.7 2.9 3.2°C 5 10 13 15.6 18.3 21 24 27 29 32°F 40 50 55 60 65 70 75 80 85 90

Note the above actual temperature reading is the value at the Engineered Airsensor or setpoint. If there is a building management system measuringtemperature, its sensor should be located within one inch of the Engineered Airsensor. Refer to the DIP switch settings to determine which of the 4 possiblevariables are being read.

DIP Switches (C-TRAC 3.2 and higher)

A DIP switch block located to the left of the RS-232 connector will switch themultimeter test point to read a variety of temperatures and setpoints. See thetable below. Note that early versions of the C-TRAC3 had selection jumpers.

Care must be taken to ensure static electricity does not damage the control’scentral processor. When working with any electronic control, discharge the staticcharge by touching ground before attempting to service. (It is best to use anapproved ground strap before servicing any electronic component).

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Voltage Readout Function Dip Switch #1 Dip Switch#2

Discharge temperature at sensor Q Off OffSPC value for the main setpoint On OffDischarge temperature at sensor X Off OnSPC for the auxiliary set point On On

Simulating a heat/cool call

It is possible to simulate a call for full heating and cooling without using a computeror PDA. A resistor or potentiometer can be temporarily installed to replace thedischarge temperature sensor(s).

For heat, if the discharge sensor was replaced with a group of resistors (48°F=910Ohms – 60°F=960 Ohms) and the SPC was at 70°F or warmer, the heat modeshould be activated (through the mode timers). As the discharge sensor does notsend a signal to the C-TRAC3 that it is satisfied the heat will remain on. (Note thatif the resistor is less then about 880 ohms the C-TRAC3 will trip on low limit).

Similarly, for full cooling call, substitute the discharge sensor with a group ofresistors (80°F=1050 Ohms – 100°F=1140 Ohms) with a SPC (calculated setpoint)of about 55°F, with acceptable ambient temperatures). This should activate themode timers and move the C-TRAC3 into cooling mode and start the cooling. Notethat fixed resistors should be 1 or 5 % tolerance for test purposes, though betteryet would be a variable resistor (pot) mounted on a scaleable fixture.

Caution: Never leave the C-TRAC in normal operation with the sensors replacedwith resistors.

ENCHANCED (COMPUTER/PDA)

The C-TRAC3 family is capable of communicating to a PDA (Personal DigitalAssistant), or IBM compatible computer. Connect with a serial cable to the RS-232port (15 pin serial port) located on the face of the C-TRAC3. Laptops andcomputers require a standard null modem cable with both ends female. The SMCsoftware required to communicate and control the C-TRAC3 will be available on theEngineered Air website at www.engineeredair.com.

Note that not all PDA’s are available with a serial cable connection.Confirm with the PDA manufacturer for availability.

For more detailed troubleshooting on how to access the C-TRAC3 from a computeror PDA refer to the Engineered Air SMC software manual. This will explain access toadditional information and points for monitoring and set point adjustments.

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Calibration

Calibration cannot be done without PDA (or laptop, etc.) using Engineered Air SMCsoftware.

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SENSOR TABLES

Note sensor values on the table below. If the sensor is disconnected, placed at afixed temperature and the resistance measured, it should be close to the valuesbelow.

SENSOR (purple and blue) Same resistance as TE 6000-960

Set-Point Dialled To

60 °F 90 °F

(orange and grey) 2.725 K 3.272 K

(orange and blue) 3.184 K 2.702 K POT

(blue and grey) 970

(purple and orange) 4.19 K 3.71 K OTHER

(purple and grey)About 1.981 K (varies with elementtemp.)

Sensor Resistance Chart for TE 6100-960 and TE6000EA3

°C °F Resistance °C °FResistance

°C °FResistance

-40 -40 602 18.3 65 983 48.9 120 1234

-34.4 -30 633 20 68 996 54.4 130 1269

-28.9 -20 665 20.6 69 1000.7 60 140 1333

-23.3 -10 698 21.1 70 1005 65.5 150 1365

-17.8 0 732 23.9 75 1026.5 71.1 160 1437

-12.2 10 768 26.7 80 1048 76.7 170 1491

-8.7 20 804 29.4 85 1070 82.2 180 1546

-1.1 30 842 32.2 90 1092 87.7 190 1602

4.4 40 881 35.6 95 1116 93.3 200 1659

10 50 921 37.8 100 1139 98.8 210 1718

12.8 55 942 43.3 110 1186 100 212 1778Reference resistance is 1035 ohms at 77°F. Resistance tolerances are ±0.05 to0.15% at 77°F. Temperature range +32 to +104°F.

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VARIATIONS ON THE C-TRAC3

Model Changes

C-TRAC3 This is the original version, thus no modifications or updates. Ithas slower communication to the PDA, does not support ModBusor expansion boards.

C-TRAC3.1 Faster PDA communication, supports ModBus and expansionboards, software changes to configurations.

C-TRAC3.2 Has DIP switches added to allow selection of testpoint readout.