Install Instructions

23
Balancing the Airflow using the Door Ports
Door balancing ports (not on all models) are designed to be used in the conjunction with a
digital manometer to measure the stale and fresh airflows for balancing.
Step 1: Prepare the airflow measuring device
(i.e. magnehelic gauge or digital manometer) by
connecting the hoses to the low and high pressure side
of the gauge.
Step 2: Insert the hoses into the rubber fittings from the
optional door port adapter kit (part 99-182). Use light
pressure and rotate until fitting is snug. Do not extend
the hose past the rubber fitting.
Step 3: Open the HRV door. Remove the 4 door port
covers by carefully pushing them out from the back
side of the door.
Step 4: Close the HRV door. Initiate power and
operate the HRV on high speed. Operate the forced
air system on high speed (if the HRV is connected to
the forced air system).
Step 5: Insert the 2 rubber fittings from the gauge to
the stale air balancing ports (see illustration for port
locattions). Seal the fresh air balancing ports with tape
(see illustration for port locations). Record your reading.
Step 6: Insert the 2 rubber fittings from the gauge to
the fresh air balancing ports (see illustration for port
locations). Seal the stale air balancing ports with tape
(see illustraion for port locations). Record your reading.
Step 7: Refer to the “Airflow Reference Chart” for your
model and determine the fresh air and stale airflow
rates (the chart is located on page 23).
Step 8: Damper down the higher airflow and repeat
Steps 5 to 7 as required until both airflows are
identical (balanced).
Step 9: Remove the tape and rubber fittings and
reinstall the 4 Door Port Covers.
Magnehelic gauge connection overview
Balancing Ports for the RNC4-TPD
and RNC4-TPF Units
Supply
Balancing
Ports
Exhaust
Balancing
Ports
High (+)
High (+)
Low (-)
Low (-)