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The C-TRAC Cooling Sequencer is a fully integrated Heating-Cooling control with Economizer, intended for use with packaged Direct Expansion cooling units, packaged air handlers with remote condensing units, or air handlers with chilled water and hot water coils.

It is the highest level of the TRAC Family. Other Engineered Air TRAC controllers can be slaved to the C-TRAC. The slaved heating controller receives a 0-10VDC control signal from the C-TRAC.

C-TRAC

Cooling Sequencer

 

 



The TRAC family of product specific controls have been designed:

  1. To provide precise control, white also incorporating operating and safety limits
  2. To eliminate electro-mechanical devices, (switches, relays, etc) by means of logic based programming.
  3. To provide rugged, dependable controllers than can withstand the rigors of a rooftop installation. The ability to operate at -40°F ambient and in the presence of electronic noise are essential


Technical Data

Power Supply: 24 VAC - 10VA

Contact Rating: 70VA @ 24VAC, 360VA @ 120VAC

Inrush Rating: 1800VA

Digital Inputs (DI): 3Digital Outputs (DO): 5
  • Ambient Changeover
  • Economizer Changeover
  • Night Set-back
  • 5 Cooling Stages
Analog Inputs (AI): 4Analog Outputs (AO): 2
  • Discharge Air Temperature Sensor
  • Discharge Air Temperature Setpoint
  • Reset Air Temperature Sensor ambient or room
  • Return or room Air Temperature Setpoint
  • Economizer: 0-10VDC or 4-20ma or 135 Ohm
  • Heating Output: to 0-10VDC Operator OR interfaced to TRAC Controller
Ambient Operating Temperature LimitsTemperature Sensors

Maximum: 105°F ( 40°C )

Minimum: -40°F ( -40°C )

1000 ohm Thin Platinum Positive Temperature Coefficient Devices (PTC)

Economizer Minimum PositionDead Band

0 - 100%

Fully adjustable 5°F to 12°F

Timing FunctionsControl Algorithms
  • Minimum Compressor Run Time: 4 min.
  • Minimum Compressor Off Time: 4 min.
  • Minimum Interstage Time: 4 min.
  • Room Control
  • Discharged Air Control
  • Discharged Air Control with Room Reset
  • Discharged Air Control with Ambient Reset
  • Discharged Air Control with BMS Reset *
    * analog signal only from BMS

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Due to continuous product development, specifications, dimensions and capacities are subject to change without notice.


The G-TRAC Industrial Furnace controller has been designed to provide accurate proportional-integral control for indirect-fired burners with particular emphasis on allowing the burner to turn down to its full capability while maintaining acceptable flue-gas properties. The G-TRAC is unique among industrial gas-fired air heater controllers, in that the air-gas ratio is monitored throughout the entire turndown range, which, in the Engineered Air DG Industrial Heater, spans from full fire to 5% of full fire, or a turndown of 20:1.

Together the DG high turndown burner and the G-TRAC controller provide optimum air heater performance.

The G-TRAC is a stand-alone controller for the Engineered Air series DG Industrial Furnance. Alternatively it can be slaved from the C-TRAC Cooling Sequencer for integrated control of a packaged air conditioner, such as the Engineered Air FW-DG, or a split system using a DG heat section and a CU condensing unit.

G-TRAC

Industrial Gas Heater Controller

 

 



Technical Data

Power Supply: 24 VAC

Contact Rating: 70VA @ 24VAC, 360VA @ 120VAC

Inrush Rating: 1800VA

Digital Inputs (DI): 4Digital Outputs (DO): 8
  • Fan Proving Switch
  • Heat Enable Switch
  • Night Operation
  • Feedback for Flame On Status
  • Supply Blower
  • Combustion Blower
  • Flame Relay
  • Inlet Air Damper Motor
  • Inlet Air Damper Motor
  • Alarm
  • Pilot Valve Operator (floating point control)
  • Gas Valve Operator (floating point control)
  • Combustion Air Operator (floating point control)
Analog Inputs (AI): 6Status Indication:
  • Discharge Air Sensor
  • Discharge Air Setpoint
  • Remote Reset Sensor
  • BMS Reset
  • Gas Valve Position Feedback
4 LED's on face of panel provide status information including the following:
  • Heat Call
  • Prepurge Timer
  • Burner On
  • Lockout Alarm: Flame Failure of Low Limit
Ambient Operating Temperature LimitsTemperature Sensors

Maximum: 105°F ( 40°C )

Minimum: -40°F ( -40°C )

1000 ohm Thin Film Platinum Positive Temperature Coefficient Device (PTC)

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Due to continuous product development, specifications, dimensions and capacities are subject to change without notice.


The Engineered Air DJ Series indirect fired burners offer superior turndown and modulates both gas firing rate and combustion air quantity.

The DJM controller is a programmed logic device that provides proportional-integral control when used with any one of the DJ series burners. The basic function of the DJM is to control discharge air temperature. The discharge air setpoint can be set either at a fixed value, or can be reset from a number of options.

The DJM in its various forms can operate as either a stand-alone controller, or it can be interfaced with our C-TRAC mechanical cooling controller.

DJM Series

Controller

 

 



Technical Data

Power Supply: 24 VAC

Contact Rating: 70VA @ 24VAC, 360VA @ 120VAC

Current Draw: 1.2 amps

Digital Inputs (DI): 4Digital Outputs (DO): 5
  • Fan switch
  • Night setback
  • Heat switch
  • Proof of flame from ignition control
  • Damper motor
  • Ignition control
  • Supply air blower
  • Pilot valve
  • Alarm
Analog Inputs (AI): 6Analog Outputs (AO): 2
  • Combustion blower speed sensor
  • Discharge air temperature
  • Discharge setpoint
  • Room (or ambient) temperature
  • Room (or ambient) setpoint
  • 0-10 vdc or 4-20 ma reset signal
  • Modulating valve output
  • Combustion air blower output
Status IndicationAmbient Operating Temperature Limits

4 LED's on face of panel.
Based on a flashing rate these lights indicate:

  • Discharge Temperature/low limit status
  • Prepurge status
  • Supply blower status
  • Flame status

Maximum: 105°F ( 40°C )

Minimum: -40°F ( -40°C )

Temperature Sensors
1000 ohm thin film platinum Positive Temperature Coefficient Device (PTC)

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Due to continuous product development, specifications, dimensions and capacities are subject to change without notice.


The H-TRAC controller has been designed to control staged electric heat applications. It utilizes a proportional-integral control stategy to sequence five binary style output stages.

The electric heat coil controlled by an H-TRAC controller is specifically designed with stages sized for operation with the binary control logic. Stage one is smallest, stage two is double stage one, and stages three, four and five are each four times the output of stage one. In this manner by activating various combinations of the physical stages, fifteen "equivalent" control stages are created (7 or 11 equivalent stages can also be provided.)

The H-TRAC can be used in a variety of control applications. Avaliable options are:

  • Discharge air control with 135 Ω proportional controller

  • Discharge air control with Maxitrol electronic sensor and setpoint adjustment

  • Room control with modulating high and low limits

  • 0-10VDC or 4-20MA reset of discharge air setpoint

  • Direct control from a higher level controller (i.e. H-TRAC becomes a slaved controller)

H-TRAC

Heat Sequencer

 

 



Technical Data

Power Supply: 24 VAC

Current Draw: 6VA

Contact Rating: 70VA @ 24VAC, 360VA @ 120VAC

Inrush Rating: 1800VA

Digital Inputs (DI): 0Digital Outputs (DO): 5
None.
  • 1st stage heat output 1/15th of total
  • 2nd stage heat output 2/15th of total
  • 3rd stage heat output 4/15th of total
  • 4th stage heat output 4/15th of total
  • 5th stage heat output 4/15th of total
Analog Inputs (AI): 4Analog Outputs (AO): 0
  • 135 ohm three wire proportional
  • 0-10 vdc or 4-20 ma direct control
  • discharge air temp
  • discharge temperature setpoint
None.
Status IndicationAmbient Operating Temperature Limits

One LED behind panel.
Off indicates temperature satisfied.
On indicates a stage is about to switch on or off.

Maximum: 105°F ( 40°C )

Minimum: -40°F ( -40°C )

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Due to continuous product development, specifications, dimensions and capacities are subject to change without notice.


The rate of heat transfer in a QDT heat pipe is dependent not only on the size, number of rows and fins, but also on the mounting angle. The Q-TRAC controller is designed to operate the tilt mechanism on a QDT heat pipe to control tilt angle.

Controlling the rate of heat transfer via tilt angle of the heat pipe has three objectives.

  • Temperature control: supply air temperature leaving the heat pipe.

  • Frost Prevention: maximizing heat transfer while preventing the formation of frost on the exhaust leaving side of the coil.

  • Heating-Cooling changeover: by reversing the tilt angle, the direction of heat transfer is also reversed to allow summer operation.


The Q-TRAC control is a stand alone solid state device that provides proportional-integral control for all three functions when mounted on a QDT heat pipe with tilt mechanism.

Q-TRAC

QDT Heat Pipe Controller

 

 



Technical Data

Power Supply: 24 VAC

Contact Rating: 70VA @ 24VAC, 360VA @ 120VAC

Digital Inputs (DI): 2Digital Outputs (DO): 2
  • Discharge Air Override
  • Frost Mode Air Switch
  • Auxiliary Heat
  • Auxiliary Defrost
Analog Inputs (AI): 2Analog Outputs (AO): 2
  • Supply Discharge Air Sensor
  • Exhaust Leaving
  • Tilt Mechanism Operator
  • Auxiliary Modulating Heat
Status IndicationAmbient Operating Temperature Limits

3 LED's on face of panel.

  • Maximum Heat Reclaim
  • Outside Deadband
  • Exhaust Cold

Maximum: 105°F ( 40°C )

Minimum: -40°F ( -40°C )

Temperature Sensors
1000 ohm thin film platinum Positive Temperature Coefficient Device (PTC)

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Due to continuous product development, specifications, dimensions and capacities are subject to change without notice.


The rate of heat transfer in an Engineered Air heat wheel is dependent on the rotation speed of the heat wheel.

The W-TRAC controller is designed to provide variable speed control for an Engineered Air heat wheel. By controlling the rotational speed of the head wheel, and in turn controlling the rate of heat transfer, three functions can be accomplished.

  • Control of supply air temperature leaving the head wheel.

  • Prevention of frost formation on the exhaust side of the wheel while keeping heat transfer at the maximum allowable level.

  • Heating-Cooling changeover. In heating mode heat is carried from the warm exhaust to the cold outside air. In cooling mode heat transfers from the warm outside air to the cooler exhaust air. The wheel simply rotates in either case and as such there is no difference in operation between heating and cooling. By stopping the wheel completely a free cooling mode can be provided. This is desirable if cooling is required and outside air is colder than the exhaust air.


The W-TRAC controller is a stand alone solid state device that provides proportional / integral control for all three of the above functions when mounted with an Engineered Air wheel.

When combined with a DC drive motor the W-TRAC can provide exceptional high turndown speed control. DC drive motors offer the advantage of high torque ability at very low speeds. The W-TRAC can also provide a 0-10 vdc control signal to a variable frequency drive if conditions require the use of an AC drive motor.

W-TRAC

Heat Wheel Controller

 

 



Technical Data

Power Supply: 24 VAC

Contact Rating: 48VA @ 4VAC, 240VA @ 120VAC

Digital Inputs (DI): 0Digital Outputs (DO): 2
None.
  • DC motor start/stop
  • VFD start/stop
Analog Inputs (AI): 5Analog Outputs (AO): 2
  • Supply discharge air temperature
  • Exhaust leaving air temperature
  • Ambient air temperature
  • Exhaust air relative humidity
  • Return air relative humidity
  • DC Motor speed control
  • 0-10 vdc for VFD motor control
Status IndicationAmbient Operating Temperature Limits

5 LED's on face of panel.

  • Low exhaust temperature
  • Faulty sensor
  • Vent mode
  • Frost mode
  • Discharge temp too high

Maximum: 105°F ( 40°C )

Minimum: -40°F ( -40°C )

Temperature Sensors
1000 ohm thin film platinum Positive Temperature Coefficient Device (PTC)

View Brochure Flash format Request Access to our Complete Catalog

Due to continuous product development, specifications, dimensions and capacities are subject to change without notice.


The Engineered Air M-TRAC controller is designed to control Engineered Air HE Series direct fired burner on make up air units. M-TRAC controller is a programmed logic device that provides a stable PI (proportional + integral) temperature control and airflow monitoring system. A dual sensor option is built in the M-TRAC controller to provide an even discharge temperature.

The M-TRAC controller has eliminated many mechanical parts such as air proving switch, damper end switch, timers and relays. The M-TRAC provides interlock between the exhaust fan and the make up air unit. This allows the M-TRAC to prove the operation of both the exhaust fan and supply fan. Reverse interlock is also available. This feature is designed for use in buildings which should not go into a negative pressure condition during start up mode.

The Engineered Air M-TRAC controller is designed to be user friendly. The controller is equipped with five diagnostic LED lights. System status can be determined by the LED color and its flashing patterns. This features allows easier troubleshooting.

The M-TRAC in its various forms can operate as either a stand-alone controller, or it can be interfaced to a higher level controller such as a C-TRAC or programmable controller. When used as a stand-alone device the controller provides most of the control requirements of a make up air unit. Standard abilities include: discharge temperature control, supply blower control, burner management, inlet damper control, auto bypass low limit, and air flow monitoring.

M-TRAC

1.3 Controller

 

 



Technical Data

Power Supply: 24 VAC

Contact Rating: 72VA @ 24VAC, 360VA @ 120VAC

Current Draw: 1.2 amps

Digital Inputs (DI): 5Digital Outputs (DO): 5
  • Fan switch
  • Main gas valve feedback
  • Heat switch
  • High limit switch
  • Proof of flame from ignition control
  • Damper motor
  • Ignition control
  • Supply air blower
  • Pilot Valve
  • Alarm
Analog Inputs (AI): 5Analog Outputs (AO): 1
  • Discharge air temperature
  • Discharge setpoint
  • Profile plate pressure
  • Room setpoint
  • 0-10 vdc or 4-20 ma reset signal
  • Modulating valve output
Status IndicationAmbient Operating Temperature Limits

5 LED's on face of panel. Based on flashing rate these lights indicate:

  • Discharge temperature/low limit status
  • Burner status
  • Air flow status
  • Flame Status
  • Operation Status

Maximum: 120°F ( 49°C )

Minimum: -40°F ( -40°C )

Temperature Sensors
1000 ohm thin film platinum Positive Temperature Coefficient Device (PTC)

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Due to continuous product development, specifications, dimensions and capacities are subject to change without notice.


The S-TRAC controller has been designed to control Engineered Air SH Series of gas fired humidifiers. It utilizes a proportional-integral control strategy to modulate humidity level.

The Engineered Air S-TRAC controller is a programmed logic controller. It has eliminated many mechanical parts such as timers, relays and water level controller. The S-TRAC provides water level, burner, humidity and system status control. It also has a built in drain cycle timer. The S-TRAC controlled SH humidifier will initiate a drain cycle depending on the hardness of the water and the firing rates of the burner. A mixing valve is also incorporated in the S-TRAC to eliminate high drain temperature.

The S-TRAC can be used in a variety of control applications.

  • Room humidity control c/w S-TRAC built-in setpoint

  • Room humidity control c/w BMS 0-10VDC setpoint

  • Return air humidity control c/w S-TRAC built in setpoint

  • Return air humidity control c/w BMS 01-10VDC setpoint

  • BMS 4-8VDC direct control

  • Ambient reset (to prevent unwanted condensation forming on windows and walls)

  • Duct high humidity limit

S-TRAC

Humidifier Controller

 

 



Technical Data

Power Supply: 24 VAC

Contact Rating: 70VA @ 24VAC, 360VA @ 120VAC

Current Draw: 6VA

Inrush Current: 1800 VA

Digital Inputs (DI): 3Digital Outputs (DO): 4
  • Humidity high limit
  • Low water level control
  • High water level control
  • Flame relay
  • Fill valve
  • Mix valve
  • Drain valve
Analog Inputs (AI): 5Analog Outputs (AO): 1
  • BMS 0-10vdc setpoint
  • BMS 4-8vdc direct control
  • Room/Return air humidity control
  • Drain sensor
  • Ambient sensor
  • Modulating gas valve
Status IndicationAmbient Operating Temperature Limits

2 LED's on face of panel. Based on flashing rate these lights indicate:

  • Tank water level status
  • Burner status
  • Operation status

Maximum: 105°F ( 40°C )

Minimum: -40°F ( -40°C )

Temperature Sensors
1000 ohm thin film platinum Positive Temperature Coefficient Device (PTC)

View Brochure Flash format Request Access to our Complete Catalog

Due to continuous product development, specifications, dimensions and capacities are subject to change without notice.


Engineered Air X-TRAC is a logic controller designed to control XE, RT, PACK and DJ(E)-20&40 with constant combustion air. The X-TRAC was designed to replace the Maxitrol controller, provide excellent temperature control, increase control flexibility, and provide safety features as provided by other TRAC controllers used for gas heat.

The X-TRAC through the use of digital electronics, has eliminated many of the traditional control components resulting in fewer parts, simplified wiring diagrams and reduced wiring. The X-TRAC replaces the Maxitrol Series 21 amplifier & auto bypass low limit.

The X-TRAC uses a control scheme incorporating Proportional and Integral control (PI) to maintain discharge temperature at set point.

The X-TRAC was designed to be easily applied to the following control applications:

      Discharge control with internal or remote setpoint

      Two level room control. When room thermostat closes, discharge temperature is reset upward to a second discharge set point

      Discharge control c/w external 4-20MA or 0-10VDC reset from BMS. Reset amount ranges from 5°F to 50°F


X-TRAC has built in non-recycling auto bypass low limit. It also has a self-check feature that ensures that the discharge sensor is operating within its tolerances. Two built-in status lights for heat call & lock out are provided.

X-TRAC

Controller

 

 



Technical Data

Power Supply: 24 VAC

Contact Rating: 70VA @ 24VAC, 360VA @ 120VAC

0.8 amps

Digital Inputs (DI): 4Digital Outputs (DO): 2
  • Fan switch
  • Heat switch
  • Heating override
  • Proof of flame from ignition control
  • Ignition control
  • Supply air blower
Analog Inputs (AI): 4Analog Outputs (AO): 1
  • Discharge air temperature
  • Discharge setpoint
  • Room setpoint
  • 0-10 vdc or 4-20 ma reset signal
  • Modulating valve output
Status IndicationAmbient Operating Temperature Limits

2 LED's on face of panel. Based on flashing rate these lights indicate:

  • Discharge temperature/low limit status
  • Flame status

Maximum: 105°F ( 40°C )

Minimum: -40°F ( -40°C )

Temperature Sensors
1000 ohm thin film platinum Positive Temperature Coefficient Device (PTC)

View Brochure Flash format Request Access to our Complete Catalog

Due to continuous product development, specifications, dimensions and capacities are subject to change without notice.