Zone
Zone
TROUBLESHOOTING
VCC-X Operator Interface SD
84
VCC-X Outputs Force
Outputs Force
Outputs Force settings are available for testing or troubleshooting the
system. These Force settings can only be accessed and programmed
from the Modular Service Tool.
CAUTION:
The Outputs Force settings should only be
applied by quali
fi
ed service personnel.
Serious damage to the HVAC unit could
result from improper use of these Outputs
Force
settings.
To access the Outputs Force settings, simply
press
the
<BALANCE
- TEST>
button on the Modular Service Tool. You will then see
the
Unit ID Screen
.
Enter Unit Address
Then Press Enter
Selected Unit#: XXXX
No Communication
Enter the unit ID of the VCC-X Controller you wish to access and
press
<ENTER>
. Once communication is established, “No Com-
munication” will be replaced with “Press Down.” Then
press
<
>
.
You will then see the screen shown below.
Press
<ENTER>
to save
entered data and
press
<
>
to scroll through the screens.
NOTE:
If “No Communication” remains, it indicates a
communication failure to the controller.
NOTE:
The Outputs Force settings are only available for the
VCC-X Controller. They are not supported for the
VAV/Zone Controllers or other Add-on controllers.
Outputs Force
Para Blocks
Save / Load / Copy
Place the cursor on Outputs Force and
press
<ENTER>
to access the
Outputs Force Screen
.
Supply Fan Override
Auto
Use < Or > To Change
The
fi
rst Outputs Force Screen
allows the AHU fan relay to be set
for Auto, Force On, or Force Off. The default setting is Auto. After
you complete all troubleshooting or testing procedures, all relays
should be changed back to this setting. The Force On setting will
force the relay to the ON (energized) position. The Force Off selec-
tion will force the relay to the OFF (de-energized) position.
The next screen displays the Relay Overrides for Relay 2. After
pressing
<ENTER>
to save any changes,
press
<
>
to have the
next relay displayed. All 23
Relay Override Screens
(including the
AHU fan relay) are available by
pressing
<
>
after each setting is
saved by pressing
<ENTER>
.
Relay Overrides
Relay 2 Override
Auto
Use < Or > To Change
After the screen for relay 23 is displayed, the
fi
rst
Analog Output
Override Screen
will be displayed.
Analog Output 1 Screen
Main Fan VFD
Override Volts: -1.0
[-1.0 = Auto]
The default setting for normal operation is -1.0 volts. Voltages
between 0 to 10.0 are valid entries.
Press
<ENTER>
after making
a setting change and then
press
<
>
and the next
Analog Output
Override Screen
will be displayed.
Analog Output 2 Screen
Economizer
Override Volts: -1.0
[-1.0=Auto]
The default setting for normal operation is -1.0 volts. Voltages
between 0 to 10.0 are valid entries.
Press
<ENTER>
after making
a setting change and then
press
<
>
and the next
Analog Output
Override Screen
will be displayed.
Analog Output 3 Screen
Modulating Heat
Override %...: -10%
[-10 = Auto]
The default setting for normal operation is -10 %. Percentages
between 0 to 100 are valid entries.
Press
<ENTER>
after making
a setting change and then
press
<
>
and the next
Analog Output
Override Screen
will be displayed.
