Emergency Cooling Mode; Emergency Ventilation Mode; Model/Serial Number Configuration; Figure 58 Economizer Setup A3 - Bard FUSION-TEC WR36BPA Service Instructions Manual

10. Press ESCAPE key several times to return to Main
Menu screen.
NOTE: The economizer delay parameter adjusts the
time the OD Temp Set, Humidity Set and Dew Pt
Set measurements (found on screen A2) can be
outside of the disabling parameters before the
economizer operation is disabled.
FIGURE 58
Economizer Setup A3
See Table 9 for default settings for economizer
operation.
When the economizer is activated during a free cooling
call only, using any of the previously mentioned modes,
a 0-10v analog signal will be sent to the economizer
actuator. The actuator will then open and close the
damper blades to maintain a supply air temperature of
55°F. If the economizer is active during optimized cooling
mode, the actuator will maintain a mixed air temperature
of 55°F. When the supply/mixed air temperature
increases, the damper will open and when the mixed air
temperature decreases, the damper will close.
The economizer may be disabled by the LC if the
system determines it needs to enter dehumidification
mode. More information about the dehumidification
sequence can be found on page 15 and in the latest
revision of LC6000 Service Instructions 2100-669.
In addition to dehum mode, the economizer may be
disabled for 5 minutes (adjustable) if the dust sensor
indicates the outdoor air may cause particulate buildup
Mode Consideration
Temperature
* In Enthalpy mode, outdoor temperature, humidity and calculated dew point are all considered for economizer operation.
Economizer Default Settings
Economizer Available for Cooling
When the outdoor air temperature
LC Online: When the outdoor humidity
Humidity
LC Offline: When the outdoor humidity
When the outdoor dew point
Dew Point
in the air filters. After the time has expired and on a call
for cooling, the economizer will open again to sample
the air. The wall-mount unit will either return to normal
operation or remain locked out for another 5 minutes.

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. The cooling demand will
be automatically set to 100% in this mode, meaning
mechanical cooling should be operating at full capacity
while this mode is active. This will stay active until the
LC returns the unit to normal operation. This mode is
only available when connected to the LC.

Emergency Ventilation Mode

If a hydrogen detector is connected to the LC/WR Series
system and there is a hydrogen alarm event, the system
will go into emergency ventilation mode. In emergency
ventilation mode, the economizers on the wall units will
be commanded to 100%. After 2 minutes, the blowers
will turn on in order to exhaust any hydrogen gas buildup
within the shelter. Once the hydrogen alarm clears, the
system will resume normal operation. This mode is only
available when connected to the LC.
Model/Serial Number Configuration
FUSION-TEC WR Series wall-mount units configure
some settings based on the model number that is input
into the unit. The model and serial number are entered
at the factory, and should be retained during a software
update. However, after a software update, it is best
practice to verify that the model and serial number is
still present and accurate. If the model and/or serial
number is missing or incorrect they will need to be re-
entered.
NOTE: When re-entering the model number, only valid
model number entries will be accepted by the
PLC.
TABLE 9
is below 70°F
is below 80%
is below 60%
is below 55°F
Economizer Not Available for Cooling
When the outdoor air temperature
is above 75°F
LC Online: When the outdoor humidity
is above 80%
LC Offline: When the outdoor humidity
is above 60%
When the outdoor dew point
is above 60°F
Manual
Page
2100-695
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