Aprilaire 8120 Safety & Installation Instructions
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Aprilaire 8120 Safety & Installation Instructions

Ventilation controller
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Download this manual See also: Owner's Manual, Safety and Installation Instructions
Safety & Installation Instructions
FAMILIARIZE YOURSELF WITH THE INSTALLATION INSTRUCTIONS BEFORE STARTING
To prevent serious injury from electrical shock this product must be installed by a qualifi ed HVAC contractor.
DANGER
120 volts can cause serious injury from
electric shock. Disconnect electrical power
to the HVAC system before proceeding.
WARNING
Sharp metal edges can cause serious injury
from cuts. Use gloves when cutting plenum
openings and handling ductwork.
Model 8120 and 8126
ATTENTION INSTALLER:
Do not mount the Vent Control on the supply plenum or duct. The unit
will malfunction at heated temperatures and lose its calibration.
When installing the Vent Control on downfl ow furnaces, ensure
blower continues to run after the heat call is satisfi ed to prevent high
temperatures from damaging the Control circuit board.
Do not mount the Vent downstream from any fresh air intake port,
humidifi er or bypass outlet. False humidity conditions will cause the
Vent Control to operate incorrectly.
DANGER
CAUTION
Ventilation Controller

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Summary of Contents for Aprilaire 8120

  • Page 1 Ventilation Controller Model 8120 and 8126 Safety & Installation Instructions FAMILIARIZE YOURSELF WITH THE INSTALLATION INSTRUCTIONS BEFORE STARTING DANGER ATTENTION INSTALLER: To prevent serious injury from electrical shock this product must be installed by a qualifi ed HVAC contractor. DANGER...
  • Page 2 INSTALLATION STEP 1: REMOVE ITEMS FROM BOX See Figure 1. FIGURE 1 – Carton Contents A. MODEL 8120 VENT CONTROL B. OUTDOOR TEMPERATURE SENSOR C. TIME ONLY RESISTOR INSERT 90-697 STEP 2: DETERMINE VENT CONTROL LOCATION AND INSTALL A. The Control must be installed in the return duct, at least 6 inches upstream of the fresh air intake opening, the humidifi er if present, and/or the humidifi...
  • Page 3 D. Install the 24 volt transformer (provided with Model 8126 only). The transformer should be continuously energized, do not wire to the HVAC blower circuit. The transformer, damper and the Vent ® APRILAIRE MODEL 6506 Control DD terminals will be wired in series. Refer to Figure 5 NC DAMPER and the 6506 damper instructions for additional information.
  • Page 4 STEP 7: CALCULATE THE VENTILATION REQUIREMENT A. The MINIMUM ventilation requirement is calculated using ASHRAE 62.2-2004. ASHRAE Airfl ow In CFM = [House Area in Sq Ft x 0.01] + [No. Bedrooms +1 x 7.5] Use the Number of Bedrooms (Plus 1) or the Number of Occupants, Whichever Is Larger Additional ventilation may be required for pets, hobbies, Minimum CFM Per Number Bedrooms HOUSE...
  • Page 5 STEP 9: SET THE SAMPLING TIME INTERVAL A. The Cycle Time Interval is the time period over which ventilation FIGURE 7 – Cycle Time will occur. This is variable from 1 to 4 hours depending on customer preference. Keep in mind, once the Ventilation requirement is met the Vent Control won’t run again until the start of the next cycle.

  • Page 6: Troubleshooting

    Step 7C CFM Required >> Step 8C KNOB SETTINGS (in minutes) FOR AIRFLOW DELIVERED vs AIRFLOW REQUIRED (1 HR CYCLE) CFM Delivered STEP 11: SYSTEM CHECK OUT A. For system test be sure that 24 VAC is applied in series with the 6506 damper (normally closed) and the A/A terminals on the Vent Control. Check the wiring as described in Step 6.

This manual is also suitable for:

8126

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