Software Revs 3,5,6,8,10, 12 Infinity /Evolution Troubleshooting (Rev. 2)
10-12-2006
19
system needed to stage down. If the homeowner is complaining, then the airflow limit for that
zone should be raised. However, the homeowner may now experience excessive noise for that
zone. It should be communicated to the equipment owner that there is a trade-off between
comfort and noise when these airflow limits are adjusted.
Zoning Situation: When increasing the set temperature for a zone, the heating does not
come on until the set temperature is 3 degrees over all of the other zones.
The system may not allow equipment to turn on after a set point adjustment if there are not
enough zones calling. Once a difference of 3 degrees exists between zones, the system can
then use those setback zones as dump zones, and the system may now turn on. Lowering the
set point back to within 3 degrees may cause the equipment to turn off. If the airflow limits are
set to Maximum, then this problem does not occur.
Zoning Situation: Continuous Fan used in some zones but not in others. Dampers are
opening in zones where fan is set to Auto
Each indoor unit must deliver a minimum airflow in continuous fan mode. If the system
determines that this airflow cannot be met due to duct capacity to zones requiring air, it will open
zones set to Auto in order to deliver the required air. This is designed into the system and is not
an equipment problem.
Damper output check
Carrier and Bryant residential zoning dampers are designed to move from full open to full close
or vice versa in 15 seconds. They are driven by 24vac triac inputs. When checking the zone
board for damper outputs, a voltmeter can be used to check between common –open or
common-closed while the damper is driving. Since the output is driven by triacs, some voltage
may be present when the dampers are not driving due to triac leakage. This voltage will is not
capable of driving a load.
When checking outputs on the damper control module, you may notice that voltage is present on
both open-common and closed-common when the damper should be moving. This is not a
problem with the damper control module. The circuitry in the actuator determines which direction
the actuator will move.
Replacing Damper actuators
The range of motion for rectangular dampers is different from round dampers. A rectangular
damper moves through 90 degrees and the round damper moves through 45 degrees. Both will
open or close fully in 15 seconds, thus the rectangular actuator rotates twice as fast as a round
actuator. Ensure the proper actuator is selected.
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