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24
HE-Series Indoor
ERV
OPERATION
6.4.1 All Fixed-Speed Units
For all fixed-speed units, manometer readings are taken and then the adjustable sheaves on the
motors are adjusted to re-set fan speeds.
Equipment Required
u
A magnehelic gauge or other device capable of measuring 0–1.0 in. water of differential
pressure.
u
2 pieces of natural rubber latex tubing, 1/8" ID, 1/16" Wall works the best.
The individual differential static pressures (DP) are measured using the installed pressure ports
located in the front of the units core access doors.
Do not relocate pressure ports. Procedure:
u
To read SCFM of Fresh Air (FA) install the “high” pressure side (+) of your measuring device
to the Outside Air (OA) port and the “low” pressure side (-) to the Fresh Air (FA) port.
u
To read SCFM of Room Air (RA) install the “high” pressure side (+) of your measuring device
to the Room Air (RA) port and the “low” pressure side (-) to the Exhaust Air (EA) port.
u
Use the reading displayed on your measurement device to cross reference the CFM output
using the conversion chart.
www.renewaire.com (800) 627- 4499
FIGURE 6.4.0 HE4XINV PRESSURE PORT LOCATIONS
PRESSURE PORTS (4)
NOTE: Tubing
should be inserted
into the test port
about 1 inch.
NOTE: Make sure
clean filters are
installed before
balancing airflow. Dirty
or clogged filters reduce
airflow through the unit.
NOTE: These
ports are carefully
located on the unit
to give the most accurate
airflow measurement.
Do not relocate pressure
ports.
