I have 2 Aprilaire 5000 EACs in our dual-system home. On one of the units, after 6 months of proper operation, the blue LED suddenly refuses to light even though it appears to be producing voltage in the ionizer. I've checked the following:
1. All 9 ionizing wires are in place and electrically continuous to the charging electrode on the door. The blue LED stays off if I manually connect the charging electrode to the contact flange using a jumper wire (and the ground to the the control electrode and ground, with another jumper wire).
2. There is no short between the ionizer wires/electrode contact and the ground flanges or the control electrode or its ground contact. The ionizer lines are electrically isolated from everything else (as they should be???).
3. The unit does appear to "power up" because I can hear it and its arcing or buzzing before it is installed, and I can measure voltage between the ionizer lines and the control electrode and ground contacts (about 480v AC) when it is connected to the media holder.
4. I can manually trigger a short circuit by letting the charge wires reach ground, which causes the unit to shut down until reset (this is the expected behavior).
I've done a manual inspection of the inner housing, the ionizer frame, and the control electrode, and I've confirmed that the ground contacts and the ionizer contact make contact with their respective contacts on the door. I've also checked that the pleats are properly oriented and the media ground contact is properly installed.
Except for the blue LED not working, I actually can't tell whether the unit is working or not (because it is producing voltage across the ionizer wires).
Any recommendations? Specific questions I have:
A. What is the voltage produced on the ionizing wires supposed to be? Does anyone know?
B. What does it mean if the blue LED fails to light but a 480v AC voltage is being produced?
C. Any further debug suggestions, please?
Thanks!
-James
1. All 9 ionizing wires are in place and electrically continuous to the charging electrode on the door. The blue LED stays off if I manually connect the charging electrode to the contact flange using a jumper wire (and the ground to the the control electrode and ground, with another jumper wire).
2. There is no short between the ionizer wires/electrode contact and the ground flanges or the control electrode or its ground contact. The ionizer lines are electrically isolated from everything else (as they should be???).
3. The unit does appear to "power up" because I can hear it and its arcing or buzzing before it is installed, and I can measure voltage between the ionizer lines and the control electrode and ground contacts (about 480v AC) when it is connected to the media holder.
4. I can manually trigger a short circuit by letting the charge wires reach ground, which causes the unit to shut down until reset (this is the expected behavior).
I've done a manual inspection of the inner housing, the ionizer frame, and the control electrode, and I've confirmed that the ground contacts and the ionizer contact make contact with their respective contacts on the door. I've also checked that the pleats are properly oriented and the media ground contact is properly installed.
Except for the blue LED not working, I actually can't tell whether the unit is working or not (because it is producing voltage across the ionizer wires).
Any recommendations? Specific questions I have:
A. What is the voltage produced on the ionizing wires supposed to be? Does anyone know?
B. What does it mean if the blue LED fails to light but a 480v AC voltage is being produced?
C. Any further debug suggestions, please?
Thanks!
-James
source https://hvac-talk.com/vbb/showthread.php?2222855-Aprilaire-5000-charges-ionizer-wires-but-no-blue-LED&goto=newpost
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