104
BCX-SVX002A-EN
Heat and Cool Mode
In this mode, the thermostat can automatically turn on heat
or cool as needed. AUTO appears on display with heat set
point and cool set point.
Fan Mode
Only use auto fan mode. The fan speed is determined by
the number of degrees the room temperature differs from
the set point.
Testing the Thermostat
Once the thermostat is configured, it should be thoroughly
tested.
Note: If using pipe sensors, verify pipe sensor is within
range to output. Check pipe temperature by
pressing the UP and DOWN buttons simultaneously.
Heat Test (For systems with heat)
1. Press SYS button until heat mode is displayed.
2. Adjust the set temperature so it is 5 degrees above the
room temperature.
3. Heat should come on within a few seconds.
4. Adjust the set temperature 2 degrees below the room
temperature and the heat should turn off. There may be
a fan delay on your system.
Cool Test (For systems with cooling)
1. Press SYS (left) button until cool mode is displayed.
2. Adjust set temperature so it is 5 degrees below room
temperature.
3. Cooling should come on within a few seconds.
4. Adjust the set temperature 2 degrees above the room
temperature and the cool should turn off. There may be
a fan delay on your system.
Fan Test (System off)
Press FAN button to toggle between Fan Off, Fan Hi, Fan
Med or Fan Low.
Tracer® UC400-B Controller
Tracer® UC400-B controller delivers single zone VAV
control in a stand-alone operation or as part of a building
automation system using BACnet® communications.
Analog Sensors
The zone sensor, entering water temperature sensor, and
the discharge air sensor, and the outside air temperature
sensor are 10 KΩ thermistors. See the following figure for
the resistance-temperature curve for these thermistors.
Figure 100. Resistance temperature curve for the
zone sensor, entering water temperature sensor, and
discharge air sensor
Zone Sensor
The controller accepts the following zone sensor module
inputs:
• Space temperature measurement (10kW thermistor)
• Local setpoint (either internal or external on the zone
sensor module)
• Fan switch
• Timed override (On) and Cancel timed override
• Communication jack
Table 34. Zone sensor thermistor curve (Resistance in Ohms)
°C °F R °C °F R °C °F R °C °F R
0 32 32885 25 77 10004 50 122 3759 75 167 1484
1 33.8 31238 26 78.8 9557 1 123.8 3597 76 168.8 1436
2 35.6 29684 27 80.6 9135 52 125.6 3445 77 170.6 1389
3 37.4 28216 28 82.4 8737 53 127.4 3301 78 172.4 1345
4 39.2 26830 29 84.2 8362 54 129.2 3165 79 174.2 1302
5 41 25520 30 86 8007 55 131 3037 80 176 1260
6 42.8 24282 31 87.8 7672 56 132.8 2915 81 177.8 1220
7 44.6 23112 32 89.6 7355 57 134.6 2800 82 179.6 1182
8 46.4 22005 33 91.4 7056 58 136.4 2691 83 181.4 1145
9 48.2 20957 34 93.2 6772 59 138.2 2588 84 183.2 1109
10 50 19966 35 95 6503 60 140 2490 85 185 1074
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