System Checkout; Troubleshooting - Aprilaire 8120 Safety & Installation Instructions

SYSTEM CHECKOUT

1 . Turn the time setting knob to the TEST/RESET position . If the installation is correct the HVAC blower will turn on
(independent of heat or cooling operation) and the damper will open for 1 minute unless the knob is turned off of
TEST/RESET . If the system does not operate see the Troubleshooting Guide .
2 . Return the time setting knob to the calculated setting . Do not leave in TEST/RESET, the Ventilation
Controller will not operate.
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TROUblESHOOTING

Technical support is available Monday through Friday, 7:00 a .m . to 5:00 p .m . CST, at 800-334-6011 . Use the
troubleshooting guide to identify and correct system faults . Contact technical support before replacing the controller
or damper, and for additional troubleshooting .
TAblE 4 – Troubleshooting Guide
Symptom Troubleshooting Procedure
HVAC blower does not 1 . Make sure HVAC equipment has power .
turn on in Test Mode.
2 . Check the wiring for R, C, W and G and Gf at both the HVAC equipment and
the Ventilation Controller .
3 . Check voltage across the Ventilation Controller R&C and C&Gf terminals .
Voltage should be in the 22 VAC to 30 VAC range .
Damper does not open in 1 . Follow steps 1-3 above .
Test Mode.
2 . Check wiring diagram to make sure the damper is wired in series with the
circuit board and transformer .
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