Diagnostics
4.Do the dampers track with a change in the %OA setpoint? The dampers utilized on the unit are not linear with respect to airflow and openness, and as such, the proportion of outside air damper movement will not be exactly equal to the %OA setpoint. However, at 20% OA the dampers should be approximately ½" open.
–Yes. Continue.
–No. Check the damper motor and linkage connections. When 24VAC is powering the damper actuator and the control signal is 0VDC, the outside air damper should be close to a "rattle tight" position and the return air damper should be open. If the 24VAC power is removed, the actuator will draw the outside air damper tightly closed and the return air damper tightly open. When 24VAC is powering the damper actuator and the control signal is 10VDC, the outside air damper should be fully open and the return air damper should be closed.
5.Is there approximately 24VAC at the COM and EXC terminals on the airflow station pressure transducer?
–Yes. Continue.
–No. Is there 120VAC on the primary side of the low voltage transformer and 24VAC volt at the transformer secondary?
–Yes. There is an open in the wiring between the transformer and the transducer. Locate the wiring problem and rectify.
–No. If there is 120VAC on the primary and 0VAC on the secondary, replace the transformer. If there is 0VAC on the primary, there is an open in the wiring supplying power to the transformer. Locate the wiring problem and rectify.
6.Remove both of the plastic tubes from the airflow station pressure transducer and gently blow into the HIGH side port. Caution: The transducer is extremely sensitive. Blowing too hard into the sensing tube may damage the transducer. Is there approximately 5VDC across the COM and OUT terminals of the pressure transducer?
–Yes. Continue.
–No. The pressure transducer is defective. Replace it.
7.Remove both of the plastic tubes from the airflow station pressure transducer and gently blow into the HIGH side port. Caution: The transducer is extremely sensitive. Blowing too hard into the sensing tube may damage the transducer. Is there approximately 5VDC across the controller input terminals that are connected to the transducer?
–Yes. There is a problem with the controller. Replace it.
–No. There is an open in the wiring between these pressure transducer and the AdaptAire controller terminals. Locate and rectify.
SOLUTION:If less outside air is desired
1.Is heat required?
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