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Economizer Operation – Minimum Position
This unit has the ability to use the damper to bring
in fresh air whenever the blower is operating. The
minimum position feature will open the economizer
blade slightly, whenever the blower is running.
To enable and adjust minimum position:
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 Economizer
Setup A3; press ENTER key.
5. Press ENTER key to scroll to Enable (see Figure 53).
6. Press UP or DOWN keys to change the parameter
to the desired value.
7. Press ENTER key to save the value and move to
the next parameter.
8. The cursor should now be on the Position
parameter.
9. Press UP or DOWN keys to change the parameter
to the desired value.
10. Press ENTER key to save the value.
Emergency Cooling Mode
If the shelter temperature is above the high temperature
alarm setpoint on the LV, 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
LV returns the unit to normal operation. This mode is
only available when connected to the LV.
NOTE: Units with a "B" in the vent package position in
the model number will not operate emergency
cooling.
Emergency Ventilation Mode
If a hydrogen detector is connected to the LV/FUSION-
TEC 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 LV.
NOTE: Units with a "B" in the vent package position in
the model number will still open the economizer
in emergency vent mode.
Emergency Off
If the supervisory controller Emergency Off input
becomes active, an alarm will be generated at the
supervisory controller and communicated to all
connected units. Upon receiving this communication,
the wall units will shut down all heating and cooling
operation, close the damper and disable the blower and
fan. This alarm will require a manual reset of the alarm
at the supervisory controller. If communication to a wall
unit is interrupted while this alarm is present, the unit
will continue to disable functionality until one of the
following occurs:
•
Communication is restored to the supervisory
controller and the alarm is cleared at the supervisory
controller
•
The global alarm reset operation is conducted from
the alarms pages
•
Power is cycled on the wall units
Unit Disable Input/Alarm
The unit is equipped with an input that can be used
in conjunction with a smoke detector, fire suppression
system or unit disable switch with a dry contact. When
this input is in an active state, the wall unit will cease
all operations. The alarm can be set to automatically
clear when the alarm condition is no longer present, or
require manual reset from the end user.
To learn more about the advanced configuration of this
alarm, refer to the Alarm Adjustment section of this
manual.
Unit Fail Alarm Output
With update 3.2.0 and above, this unit will use
terminals 3 + 4 as Unit Fail Alarm loop. This alarm
output is hard coded and not configurable. The
following alarms or conditions will trigger this alarm.
•
Power lost to PLC
•
Program error
•
High pressure alarm
•
Low pressure alarm
•
No airflow alarm
By default, this alarm is set up for open on fail but can
be changed to close on fail by moving the wire from
the NC7 terminal on the PLC to the NO7 terminal (see
Figure 55 on page 38).
Model/Serial Number Configuration
FUSION-TEC wall-mount units configure some settings
based on the model number that is input into the
unit. The model and serial numbers 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 numbers are
still present and accurate. If the model and/or serial
Manual 2100-694B
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Troubleshooting
