EngA C-TRAC2 Installation, Operation And Maintenance Manual page 8

A
Option SW1
1 On
2 Off
3 On
4 On
5 On
The above systems that have a room sensor/set-point can have a night setback to lock off the mechanical
cooling and economizer and reduce the heating set point at night. The setback is activated when C-
TRAC2.1 terminal K has 24 VAC applied to it. During the time terminal K is powered, the discharge sensor
is locked off so the C-TRAC control is just from the space sensor/set point. If the sensor is in the return air
the supply fan must be turned on for the sensor to be able to sense space temperature.
To repeat, the pre-selected options are set at the factory by setting the dipswitches and pots. If the settings
are not correct the C-TRAC2.1 will not be able to function as designed due to the logic chip receiving
incorrect information.
On the following page is a list of adjustment pots on the C-TRAC.
First, note the newer C-TRAC2.1 does not have a P6 pot. Refer to page 6 for more information.
Second, in addition to the pots under the cover on the front of the C-TRAC, there are additional pots
located on the back of the C-TRAC. The control needs to be moved off the back wall to access these pots.
P8 Room or ambient reset deadband (refer to page 19 for more information).
P9 BMS or valve reset (refer to page 19 for more information).
P10 BMS calibration (refer to page 19 for more information).
P11 Heating control band setting (refer to page 19 for more information).
IOM-12
SW2 SW3 SW4
Off Off Off
On Off Off
Off On Off
Off Off On
Off Off Off
Page 3
C-TRAC2.1 MANUAL
SW5 REMARKS
Off Discharge control
Off Room control (not recommended)
Off Discharge control c/w room or return reset
Off Discharge control c/w ambient reset
Discharge control c/w 4-20 ma, 0-10 VDC
On BMS reset or inlet vane position reset on
supply fans
March 1999 R1