Programming Guide

VAV-SVP01A-EN 99
Troubleshooting
• Change the heat and/or cool set points.
3. Actuator not driving full drive time
• Drive time in advanced configuration not set at 90 seconds on current Varitrane units
• Adjust to correct damper travel time using Rover service tool. See Operation and
programming chapter.
• Damper actuator loose on shaft
• Tighten damper actuator set screw to damper shaft
• Measure the power input to TB1-1 24VAC input and TB1-2 on the VAV VV550 Controller
board. The supply voltage should be between 20 and 28 VAC (24VAC cataloged). However,
voltages at either extreme may result in system instability and cause damper to not be
driven its full range.
• If no voltage, check up stream of controller to see were voltage has been interrupted. See
Figure 59, p. 107 to Figure 66, p. 114 for correct unit diagrams.
4. Actuator motor has failed
• Check Voltage at J1-6 to TB1-2, you should have 24VAC. If 24VAC is not present check
incoming power to the VAV VV550 Controller board on TB1-1 and TB1-2. Should measure
24VAC ± 10%. If you measure the proper voltage at TB1-1 and TB1-2 and no voltage at J1-6
and TB1-2, replace the VAV VV550 Controller.
• Check motor by applying 24VAC directly to common (blue) and jumper open (black) wire to
a ground to drive damper open.
• Damper should drive open.
• Check motor by applying 24VAC directly to common (blue) and jumper closed (red) wire to
a ground to drive damper closed
• Damper should drive closed
Note: VV550 Outputs are switched to ground. Do not jumper 24VAC to J1-3 of J1-4 because
damage will occur.
• If damper actuator does not open or close replace actuator
VAV Series Fan Failure Procedures
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures recommended in this section of the manual
could result in exposure to electrical, mechanical or other potential safety hazards. When
possible, disconnect all electrical power including remote disconnect and discharge all energy
storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized. When necessary to work with live
electrical components, have a qualified licensed electrician or other individual who has been
trained in handling live electrical components perform these tasks. Failure to follow all of the
recommended safety warnings provided, could result in death or serious injury.
In the event that the fan output is not energizing, properly inspect the following:
1. Verify the output configuration in the VV550 setup menu.
• Unit needs to be configured as Series fan
2. Outputs on the VV550 are configured as normally closed
• Verify the output configuration in the VV550 setup menu.
Note: Series fan powered units in the occupied mode has the fan continuously energized. See
operation Chapter for details