Occupied/Unoccupied; Indication And Diagnostic Lights - EngA C-TRAC3 Installation, Operation And Maintenance Manual

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OCCUPIED/UNOCCUPIED

The C-TRAC3 is capable of a wide variety of control options for occupied/unoccupied control. Read the
unit function and wiring diagram carefully to understand the particular application. The mixing dampers
will set to 100% return air. This option is not available on make up air equipment.
The C-TRAC3 is capable of unoccupied heating and unoccupied cooling. Additionally, unoccupied fan
control may be continuous or intermittent.
An independent unoccupied setback thermostat is required if the unit does not have any method of
temperature reset. Normally the modulating room reset sensor is used, with the unoccupied setback
temperature pre-programmed. Systems using a remote 0-10Vdc discharge setpoint will trigger
unoccupied heating with an input signal greater than 6Vdc.
Switching input power (24Vac) from terminal 'FS' (fan switch or occupied mode) to terminal 'K' (knight or
unoccupied mode) puts the equipment into unoccupied mode. An EMS controller, connected to the C-
TRAC3 may enable occupied and unoccupied modes without the need of the FS and K input terminals.

INDICATION AND DIAGNOSTIC LIGHTS

On the face of the C-TRAC3 are 3 small LED lights, coloured green, yellow, and red. The green light is to
indicate the C-TRAC3 is powered and ready for operation. If power (24Vac) is applied to terminals H and
N, and the light is not on, the C-TRAC3 may be faulty and/or the fuse is blown. The yellow light indicates
mode and blower delay. The red light indicates problems and failures.
The yellow and red lights will flash on and off a number of times for indication. A noticeable pause occurs
between sets of flashes to avoid confusion. It is not the rate of flashes, but the number of flashes. Refer
to the table listed on the face of the C-TRAC3 or the table below.
# of Flashes
1 Heat Mode
2 Economizer Mode
3 Cool Mode
4 Dual Mode
5 No Mode
6 Blower Delay
7 Unused
8 Manual Control Mode
Heat Mode flashes when the C-TRAC3 is in this mode. The HE1 and HE2 contacts will be closed and the
modulating output will react based on the heating demand. It is possible to be in heat mode, with no
heating occurring.
Table 2
Yellow LED
11 of 21
Red LED
Temperature outside dead band
Mode change blocked
Cooling mode blocked
Low Limit
Open Sensor
Heat Fail
Auxiliary Alarm
Low Air Flow
C-TRAC3
Jan 13 R5