Supply Temperature Sensor Failure Alarm; Emergency Cooling Mode; Emergency Cooling − Orphan Mode; Emergency Ventilation Mode - Bard MEGA-TEC W180B Service Instructions Manual

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.

Emergency Cooling Mode

If the shelter temperature is above the high temperature
alarm setpoint on the LC, the unit will be commanded
into emergency cooling mode. In this mode, the
unit will operate the economizer regardless of the
economizer setup, as long as the outdoor temperature is
below the indoor temperature. This will stay active until
the LC returns the unit to normal operation.
Emergency Cooling − Orphan Mode
When the unit is not connected to the LC6000 and
operating in orphan mode, the unit still has the
capability to operate in emergency cooling mode. By
default this feature is not enabled.
To enable emergency cooling in orphan mode:
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 Adv System
Config; press ENTER key.
4. Press UP or DOWN keys to scroll to Emer. Cool B6.
5. Press ENTER key to scroll to Use emergency cool
in Orphan mode? (see Figure 59).
6. Press UP or DOWN keys to change the value.
FIGURE 59
Emergency Cool – Orphan Mode
When this feature is used instead of using the zone
sensor, an alarm will be triggered by the high return air
temperature alarm.
To adjust the return air temperature settings:
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 Return Air
Alarm A5.
5. Press ENTER key to scroll to Enable, Lower
Limit or Upper Limit (see Figure 60).
6. Press UP or DOWN keys to disable the alarm or
change the limit values.
FIGURE 60
Adjusting Return Air Alarm Settings

Emergency Ventilation Mode

If the emergency ventilation input at the LC is active,
the system will go into emergency ventilation mode. In
emergency ventilation mode, the economizers on the wall
units will be commanded to 100%. This mode is only
available when connected to the LC.
NOTE: All units will receive the emergency ventilation
command. Wall units not equipped with
economizers will still engage the blower.

Electric Heat Option

Electric Heat Components

Electric Heating Element

The unit can be optionally equipped with 9kw, 18kw
or 36kw of heat: The 9kw option is a single stage
heating element, the 18kw option comes equipped
with two 9kw heating elements that operate in two
stages and the 36kw option comes equipped with two
18kw heating elements that operate in two stages.
The heating elements are located downstream of the
evaporator coils and can be accessed through the upper
control panel door.
To view the status of the electric heat outputs:
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.
Manual 2100-749
Page 37 of 68