VAV-SVX01C-EN 45
UCM Programming and Operation
To enter the service mode:
1. Connect to the Comm4 link and scan for devices. See ‘Accessing Rover/Comm4’ p. 30
2. In the device list on the left side of your screen, double-click the controller that you want to place
in the service mode.
3. Click the Enter Service Mode button. While the controller is in the service mode, it appears
in bold in the device list.
To exit the service mode, do one of the following:
• Wait for 15 minutes (Rover Comm4 does not need to be online with the controller).
• For each controller in the service mode, click the Exit Service Mode button.
Overriding VAVs
When you override a controller, Rover Comm4 automatically places the controller in the service
mode. The controller is automatically released from the service mode after 15 minutes or when you
click the Exit Service Mode button for the device. You can manually release overrides by selecting
the appropriate release command in the Override dialog box.
1. On the Tools menu, click Overrides.
2. Select whether to override TUCs or VAVs.
3. Click the units you want to override.
4. In the list of overrides, click the type of override you want to perform.
5. Click the Override button. The controller automatically enters the service mode and exits the
service mode 15 minutes after receiving an override.
Resetting Diagnostics
You can reset diagnostics only for TUCs (not VAV units).
1. In the device list on the left side of your screen, double-click the controller for which you want
to reset diagnostics.
2. Click the Diagnostics button.
3. Click the Reset button. Rover Comm4 attempts to clear all diagnostics on the controller and a
message appears.
4. Click OK to close the message and the Diagnostics dialog box. You can click the Diagnostics
button again to verify which diagnostics have been cleared.
Saving VAV Program
Each VAV unit with a UCM 4.2 has been factory commissioned with a program that can be saved
to your hard drive.
This can be used to save the original program for a backup in case unit needs to be put back to
original specifications or to download into a UCM 4.2 DDC controller that has like parameters that
has been corrupted.
1. Select the Configure button, and the Configuration screen will appear.
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