VAV/ZONE DAMPER FORCE
75
VCB-X Operator Interface SD
VAV/Zone Damper Force Modes
Damper Force Modes
Damper Force Modes are available for testing or balancing the system.
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 com-
munication 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 VCB-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 VCB-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 70
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 70
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 71
for complete setpoint information.
CAUTION:
The Damper Force Modes should only be used
by
quali
fi
ed service personnel. Serious damage to
the ductwork could result if the dampers are all
forced closed and the HVAC unit fan is operating.
