Outdoor Temperature Sensor Failure Alarm; Outdoor Humidity Sensor Failure Alarm; Supply Temperature Sensor; Supply Temperature Sensor Failure Alarm - Bard FUSION-TEC HR35BPA Service Instructions Manual

The outdoor humidity 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 Outdoor Hum
Sensor C6; press ENTER key.
5. Reference the Value to see the input of the sensor
(see Figure 49).
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 49
Outdoor Humidity Sensor

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.
Manual 2100-694B
Page 32 of 62
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; press ENTER key.
5. Reference the Value to see the input of the sensor
(see Figure 50).
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 50
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 measurement for
the economizer to be enabled is above the outdoor air
temperature setpoint (70°F) for 120 seconds, an alarm
will be generated and the economizer will be disabled
until the cooling call has been removed. This alarm 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; press ENTER key.
5. Press ENTER key to scroll to Hi and Diff value (see
Figure 51).
6. Press UP or DOWN keys to change the differential
to the desired value.
7. Press ENTER key to save.