Filter Indicator Light; Indoor Airflow Operation; Blower Speed Control; High Sensible Operation - Bard MEGA-TEC W180B Service Instructions Manual

The threshold of this alarm is adjusted by changing the
settings on the switch (see Figure 30).

Filter Indicator Light

The wall-mount unit is equipped with a 24V indicator
light mounted on side of unit that displays the current
status of the filter (see Figure 30). When the light is
on, the filter needs to be replaced. Once the filter(s)
has been changed and the alarm has been cleared, the
indicator light will turn off.
To view the status of the output:
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 Digital
Outputs; press ENTER key.
5. Press UP or DOWN keys to scroll to Digital Outputs
C2-1.
6. The status is displayed next to Filter Light (see
Figure 31).
FIGURE 31
Verifying Filter Light Status
The filter light output can be put into override to aid in
troubleshooting. The override will only stay active for 5
minutes.
To override the filter light output:
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 Digital
Outputs; press ENTER key.
5. Press UP or DOWN keys to scroll to Digital Outputs
C2-5.
6. Press ENTER key to scroll to Enable Override (see
Figure 32).
7. Press UP or DOWN key to change value to Yes.
Manual 2100-749
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8. Press ENTER key to scroll to Filter Light.
9. Press UP or DOWN key to change value to On or Off.
FIGURE 32
Overriding Filter Light Output

Indoor Airflow Operation

Blower Speed Control

The blower is capable of changing speeds to best
match the requirements of the system depending on
which mode the system is in.
The unit will automatically adjust its blower speed
based on the mode and number of stages active. In
addition to the nominal speeds for each cooling stage,
the controller has the option to enable high sensible
operation or Balanced Climate
TABLE 9
W180 Blower Speed Settings*
Mode
Blower Only
Free Cooling
Balanced Climate
Cooling
Stage Nominal
1
High Sensible
Balanced Climate
Cooling
Stages Nominal
2 and 3
High Sensible
Heating Stage 1
Heating Stage 2
Dehumidification
Emergency Ventilation
Freeze Condition
* Blower position percentages are communicated through
Modbus and cannot be verified with meter.
operation (see Table 9).
TM
Blower %
230V 460V
35.0 35.0
48.0 43.0
20.2 19.3
30.0 26.2
37.0 29.0
34.6 30.5
48.0 43.0
53.0 46.0
48.0 43.0
48.0 43.0
34.6 30.5
100.0 100.0
48.0 43.0