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25
B
ALANCING THE
A
IRFLOWS
–
D
OOR
P
ORTS
Door balancing ports are designed to be used in the conjunction with a digital manometer to measure
the stale and fresh airflows for balancing. Refer to
door ports.
1.
Prepare the airflow measuring device by connecting the hoses to the low- and high-pressure side
of the gauge.
2.
Insert the hoses into suitable rubber fittings (comes with 99-BAL-KIT). Use light pressure and
rotate until fitting is snug. Do not extend the hose past the rubber fitting.
3.
Open the HRV door. Remove the four door port covers by carefully pushing them out from the
back side of the door.
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).
5.
Insert the 2 hoses from the gauge into the exhaust balance ports. Seal the supply balance ports
with tape. Record your reading. If you get a negative reading, the hoses need to be reversed.
6.
Insert the 2 hoses from the gauge to the supply balance ports. Seal the exhaust balance ports
with tape. Record your reading. If you get a negative reading, the hoses need to be reversed.
7.
for your model to determine the supply airflow and exhaust airflow rates.
8.
Damper down the higher airflow and repeat Steps 5 through 7 as required until both airflows are
identical (balanced).
9.
Remove the tape and hoses and reinstall the four door port covers.
