Discharge Calibration Method 2; Discharge Calibration Method 3; Discharge Calibration Method 4; Room Or Return Air Temperature Calibration Methods - EngA C-TRAC2 Installation, Operation And Maintenance Manual

A

Measure the temperature at the discharge sensor (TE 6000-960). This must be an accurate
measurement taken right at the sensor. On some units there are two TE 6000-960 sensors that get
switched by a relay depending on what function the C-TRAC2.1 is in. The D/A sensor before the
cooling coil is for heating, the one after for cooling.
NOTE:
If there is not a stable discharge temperature it will not be possible to calibrate
accurately. It may be necessary to stabilize the discharge temperature in some
way during this procedure.

Adjust the discharge set point to read the same as the temperature at the sensor.

Adjust pot 2 until the output voltage across terminals HT and B just falls to 0 VDC.

Discharge Calibration Method 2

SET DIP SWITCHES AS IN 1

Accurately measure the discharge temperature (average of multiple readings). Adjust pot 2 until the
discharge temperature average matches the setting of the discharge set point. This process may
require several sets of readings and adjustments

Discharge Calibration Method 3

SET DIP SWITCHES AS IN 1

Accurately (average of multiple readings) measure the discharge temperature. Quickly (10 seconds
max.) set the discharge set-point to the read average discharge temperature, and quickly adjust
pot 2 until the time delay activated light goes off, and is in the middle of the light off deadband.

Discharge Calibration Method 4

SET DIP SWITCHES AS IN 1

Set the discharge set point to the required set point. Connect the discharge temperature
simulator and set the simulator temperature dial to the required set point. Adjust pot 2 until the
internal time delay activated light goes off, and is midway between the two on points. This
method does not compensate for sensor calibration or sensing location errors.

Room or Return Air Temperature Calibration Methods

Room sensors can be a single sensor located in the centre of the space, or can consist of a number of
sensors wired in a series/parallel configuration. If an average condition is being measured and you only
measured the temperature at one sensor, your calibration will not reflect the average condition.

Room Calibration Method 1

SET DIP SWITCH 1 ON AND 2, 3, 4, 5 OFF

Measure the temperature at the room or return sensor. Set the room or return set point to the
measured value. Set the discharge set point (usually knob on C-TRAC) to a point that the internal
time delay light is off. Turn on dipswitch 3. If the internal TD light comes on, gradually adjust pot 4
until the internal time delay activated light goes off, and is mid way between the two on points.

Room Calibration Method 2

SET DIP SWITCHES AS IN 1

Attach the temperature simulator pot in place of the room or return sensor and set the
temperature simulator pot to the desired calibration temperature. Set the room or return set-point
pot to the same temperature. Gradually adjust pot 4 until the internal time delay activated light
goes off, and is mid way between the two points. This method does not compensate for sensor
calibration or sensing location errors.

Ambient Reset Calibration


First check discharge calibration by turning dipswitches "2, 3, 4" and "5" OFF. Ensure dipswitch 1 is ON
IOM-12
C-TRAC2.1 MANUAL
.
Page 16 March 1999 R1