VAV/ZONE DAMPER FORCE
81
VCC-X Operator Interface SD
VAV/Zone Damper Force Modes
Damper Force Modes
Damper Force Modes are available for testing or balancing the sys-
tem. These Force Modes can be accessed and programmed from
the Modular Service Tool.
Modular Service Tool Instructions
When using the Modular Service Tool, simply
press
the
<BALANCE
- TEST>
key. You will then see the
Unit ID Screen
.
Enter
the unit
ID of the controller you wish to access and
press
<ENTER>
. Once
communication is established, “No Communication” will be replaced
with “Press Down.” Then
press
<
>
.
NOTE:
If “No Communication” remains, it indicates a
communication failure to the controller.
The following screen will be displayed:
Damper Force
Para Blocks
Load / Save / Copy
With the cursor on Damper Force
,
press
<ENTER>
to access the
Damper Force Mode Screen
.
Dampers Force Mode Screen
If the unit ID you entered is for a VCC-X Controller that has VAV/
Zone Controllers connected to its communication loop, the Damper
Force Mode will act as a “Global” Damper Force Mode. That is, all
VAV/Zone Controllers on that VCC-X Controller’s communication
loop will be forced to the same Damper Force Mode setting. If the
unit ID you entered is for a VAV/Zone Controller, the Damper Force
Mode setting will only apply to that VAV/Zone Controller.
Damper Force
Enter Force Mode: 0
0=Auto 1=Open 2=Clsd
3=Max 4=Min 5=Fixed
Set the appropriate Damper Force Mode by entering numbers 0
through 5. Following is a list of the force modes and their meaning:
0 = Auto
This is the default setpoint. With this setting,
the damper will operate normally and modulate
according to the controller setpoints.
1 = Open
This setting will force the dampers to their
fully-open
position.
2 = Clsd
This setting will force the damper to its fully-
closed
position.
3 = Max
This setting will force the damper to its
Maximum
Position
Setpoint.
See
VAV/Zone
Controller
Setpoint
Screen
#5
on
page 76
for
complete
setpoint
information.
4 = Min
This setting will force the damper to its
Minimum
Position
Setpoint.
See
VAV/Zone
Controller
Setpoint
Screen
#5
on
page 76
for
complete
setpoint
information.
5 = Fixed
This setting will force the damper to a
fi
xed
position based on the Fixed Position Setpoint.
See
VAV/Zone Controller Setpoint Screen #8
on
page 77
for complete setpoint information.
CAUTION:
The Damper Force Modes should only be used
by
quali
fi
ed service personnel. Serious dam-
age to the ductwork could result if the dampers
are all forced closed and the HVAC unit fan
is
operating.
