Space Comfort Controller (v15 & later): Advanced Overrides

When you go to the advanced overrides page for a Space Comfort Controller, in addition to Present Value, the following fields can be overridden:

Water Valve

This group is hidden when connected to the LCI-R controller and LCI-I controller.

• Drive Open: Drives all of the hydronic valves to 100% open. This option is unavailable if the UCM or BCU is offline.

• Drive Closed: Drives all of the hydronic valves to 100% closed. This option is unavailable if the UCM or BCU is offline.

• Release Override: Returns the device back to normal hydronic valve operation.

Air Valve

This group appears when the unit is read to be a VAV UCM.  It also appears when you opt to configure the controller as a VAV.

• Drive Open: Select Auto or Open or set a referencer to determine the setting. When set to Open, the VAV air valve is 100 percent open. For example, during a smoke purge, the VAV box needs to be 100 percent open.

Note: This field is available only if the unit is configured to be a VAV and is online or when you change the unit type to VAV while the unit is offline.

• Drive Closed: Select Auto or Closed or set a referencer to determine the setting. When set to Closed, the VAV air valve is 100 percent closed.

Note: This field is available only if the unit is configured to be a VAV and is online or when you change the unit type to VAV while the unit is offline.

• Drive to Min Cooling Flow Setpoint: The unit drives all valves to the minimum setpoint. This option is unavailable if the UCM or BCU is offline.
• Drive Max Cooling Flow Setpoint: The unit drives all valves to the maximum setpoint. This option is unavailable if the UCM or BCU is offline.

Auto Commissioning Sequence Group

This group only displays when the UCM is read to be a Trane VAV, or you opt to configure the controller as a VAV.

• Start (Auto Commissioning) Sequence: Use this option to command a Trane VAV box to start its autocommissioning sequence. Full use of this function requires the presence of an auxiliary temperature sensor in the discharge air stream (without it the fan and reheat operation cannot be tested). The Trane VAV box reports a status of "Test" in the Active Mode field on the Status tab while the sequence is executing.

• The Autocommissioning Sequence may take up to 20 minutes depending on the local reheat capability and assuming a 90 second air damper stroke time on the VAV box.

• Cancel (Auto Commissioning) Sequence: Use this option to command a Trane VAV box to stop its autocommissioning sequence. The Trane VAV box reports a status of "Test" in the Active Mode field on the Status tab while the sequence is executing.

Note: If the autocommissioning sequence is canceled while the VAV box is calibrating the VAV box first finishes its calibration before returning to normal operation.

Related Topics

• Overrides: View All
• Advanced Overrides: View, Create, Release, Out of Service
• Space Comfort Controller (v14 & earlier): Advanced Overrides