Outdoor Temperature Sensor Failure Alarm; Outdoor Humidity Sensor Failure Alarm; Supply Temperature Sensor; Supply Temperature Sensor Failure Alarm - Bard FUSION-TEC WR36BPA Service Instructions Manual

6. To apply an offset, press ENTER key to scroll to
Offset.
7. Press UP or DOWN keys to change to the desired
value.
8. Press ENTER key to save the value.

Outdoor Temperature Sensor Failure Alarm

When the sensor reads a value that is outside of the
acceptable -41 to 303.0° range, an alarm will be
generated indicating the sensor has failed. This alarm
condition will disable the economizer.
This alarm is fixed and cannot be adjusted.

Outdoor Humidity Sensor Failure Alarm

When the sensor reads a value that is outside of the
acceptable 0 to 100% RH range, an alarm will be
generated indicating the sensor has failed. This alarm
condition will disable the economizer when the mode is
set to temperature and humidity or enthalpy.
This alarm is fixed and cannot be adjusted.

Supply Temperature Sensor

The unit is equipped with a supply air temperature
sensor to monitor the leaving air temperature of the
unit. The temperature is measured with a 10k ohm
NTC thermistor.
The supply air temperature can be verified by:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to I/O Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Supply Air
Sensor C5.
5. Reference the Value to see the input of the sensor
(see Figure 55).
6. To apply an offset, press ENTER key to scroll to
Offset.
7. Press UP or DOWN keys to change to the desired
value.
8. Press ENTER key to save the value.
FIGURE 55
Supply Air Sensor

Supply Temperature Sensor Failure Alarm

When the sensor reads a value that is outside of the
acceptable -41.0 to 303.0° range, an alarm will be
generated indicating the sensor has failed.
This alarm is fixed and cannot be adjusted.

High Supply Air Temperature Alarm

When the supply air temperature is above 80°F for
120 seconds, an alarm will be generated and the
economizer will be disabled until the cooling call has
been removed. This alarm can only be activated during
free cooling and will automatically reset once the
economizer is no longer disabled.
To change the high supply air temperature alarm:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
USER password 2000.
3. Press UP or DOWN keys to scroll to System Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Alarm Setup A5.
5. Press ENTER key to scroll to Hi and Diff value (see
Figure 56).
6. Press UP or DOWN keys to change the differential
to the desired value.
7. Press ENTER key to save the value.
FIGURE 56
Adjusting Supply Air Temperature Differential

Low Supply Air Temperature Alarm

When the supply air temperature is below 45°F for
120 seconds, an alarm will be generated and the
economizer will be disabled until the cooling call has
been removed. This alarm can only be activated during
free cooling and will automatically reset once the
economizer is no longer disabled..
To change the low supply air temperature alarm:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
USER password 2000.
3. Press UP or DOWN keys to scroll to System Config;
press ENTER key.
Manual 2100-695
Page 33 of 54