Is The C-Trac2.1 Properly Configured; Does Control Cycle Through An Excessive Number Of Operating Modes; Voltage Noise; Heating Trouble Shooting - EngA C-TRAC2 Installation, Operation And Maintenance Manual

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how close the room temperature is from being correct. There is an adjustable amount of
authority for these overrides. The amount is selected at the factory and should not be
field adjusted without authority from the factory. A room reset will have reached the limit
of its reset authority if the space is 3.5º above or below the room thermostat set point.
The output to satisfy the calculated discharge temperature can be heating (modulated or staged),
economizer, or staged cooling. The heating source can be provided by hot water, steam, electric heat, or
gas heat (DG, DJ, HE style units).

Is the C-TRAC2.1 Properly Configured?

In order to perform properly the C-TRAC2.1 must be configured to the job specifications. Ensure all
switches and pots are set to the proper settings. It may be necessary to contact the factory for these
set points if the correct values are not known.

Does Control Cycle through an Excessive Number of Operating Modes?

1. Is the control properly configured?
2. Has switch 8 been left on? If so turn it off.
3. Consult factory. (Have unit serial, model and tag available).

Voltage Noise

Firstly it is possible for an AC signal to have an effect on any of the wiring to the C-TRAC2.1 sensors
and set points. The use of shielded cable with a grounded shield at one end only for these purposes
may be a necessity if there is an induced voltage on the C-TRAC2.1 wiring. It is usually possible to
detect if an induced voltage is present by measuring for an AC voltage across ground and each
suspect wire when the source of the induced voltage is active. The suspect wires to each device must
be disconnected as a pair from the C-TRAC2.1 for this test. If possible, the test should be done with
supply/return fans, compressors and condenser fan motors running, as each of these devices put out
electrical noise.

Heating Trouble Shooting

Overheating

NOTE:
There are two heat ramps (HD or HT) on the C-TRAC2.1. Ensure wiring to the
correct heat ramp as per the wiring diagram for the unit.
It should be standard practice to set the control as a discharge only control if trying to trouble shoot it.
This practice will remove any possibility of "reset" creating a situation that may appear to be a control
problem. After setting the switches to a discharge only control, troubleshoot the system and then when
satisfied it is operating correctly, switch in the resets one at a time to determine which if any may be the
cause of overheating.
If the heating control is the 109 interface, there may be some overheating at the low fire position due to
the delay off timer that operates the 109 contacts 8 and 9.
Is there any problem with the discharge sensors resistance?
Note that there may be a short or a low resistance path in the discharge sensor circuit.
Is the sensor located in a good sensing location?
A good sensing location is where there is a high volume of non stratified air, which is a good
representation of the average temperature.
Are the controls calibrated?
The C-TRAC2.1 discharge control is calibrated using pot 2 (dis cal). You must ensure that there is
no override before adjusting the discharge calibration pot. The room set point is calibrated using
pot 4 (room cal). Refer to the calibration section for instructions on calibration
C-TRAC2.1 MANUAL
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March 1999 R1