Filter
Top Products
UV-SVP01A-EN 58
Troubleshooting
Requested mode OFF
You can communicate a desired operating mode (such as OFF, HEAT, and COOL) to the controller. When
OFF is communicated to the controller, the unit controls the fan OFF. There is no heating or cooling
(valves are closed).
Freeze avoidance
When the fan is
OFF and the outdoor air temperature is below the freeze avoidance setpoint, the
controller disables economizing and keeps the outdoor air damper closed. This includes
UNOCCUPIED
mode when there is no call for capacity or any other time the fan is
OFF.
UNOCCUPIED mode
When the controller is in the
UNOCCUPIED mode, the outdoor air damper remains closed unless
economizing is enabled.
Warm up and cool-down
The controller includes both a morning warm up and cool-down sequence to keep the outdoor air
damper closed during the transition from
UNOCCUPIED to OCCUPIED. This is an attempt to bring the
space under control as quickly as possible.
Normal operation
The controller opens and closes the outdoor air damper based on the controller's occupancy mode and
fan operation. Normally, the outdoor air damper is open during
OCCUPIED, OCCUPIED STANDBY, and
OCCUPIED BYPASS mode when the fan is running and closed during UNOCCUPIED mode unless the
controller is economizing. For more information see, Modulating Outdoor Air Operation, on page 43 for
more information.)
Table 33: Outdoor air damper stays closed
Probable cause Explanation
Table 34: Outdoor air damper stays open
Probable Cause Explanation
Unit wiring
The wiring between the controller outputs and the outdoor air damper must be present and correct for
normal damper operation.
Unit configuration
The controller must be properly configured based on the actual installed end devices and application.
When the unit configuration does not match the actual end devices, the damper may not work
correctly.
Manual output test
The controller includes a manual output test sequence you can use to verify output operation and
associated output wiring. However, based on the current step in the test sequence, the unit damper
may be open. For more information see, Manual Output Test, on page 48 for more information.)
Normal operation
The controller opens and closes the outdoor air damper based on the controller's occupancy mode and
fan operation. Normally, the outdoor air damper is open during
OCCUPIED, OCCUPIED STANDBY, and
OCCUPIED BYPASS mode when the fan is running and closed during UNOCCUPIED mode unless the
controller is economizing. For more information see, Modulating Outdoor Air Operation, on page 43 for
more information.)