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EV-Series Premium
ERV
INSTALLATION
u
Verify the unit has clean filters in place.
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Open the pressure port caps for the OA airstream and then insert the tubing into the openings
about 1".
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Take a differential pressure reading for the OA airstream and compare the pressure drop to
the chart in Section 5.2.1 to obtain the CFM. Adjust the fan speed potentiometer (see Figure
4.6.1) to obtain the desired CFM. Enter the CFM information in the box in Section 5.2.2.
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Take a differential pressure reading on the RA airstream and compare the pressure drop
to the table in Section 5.2.1 to find the CFM of the RA airstream. Adjust the RA fan speed
potentiometer to obtain the desired balance. Enter the CFM information into the box in
Section 5.2.2.
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Install a jumper on the low voltage terminal to force the unit into Boost (high speed) mode.
See the wiring diagram in Section 4.7.
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Repeat the process for both airstreams to set both the CFM and balance. Enter the
information in the boxes in Section 5.1.
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After adjusting the potentiometers, take additional readings as needed to verify that fan
speed settings are correct. See Figure 4.6.1.
FIGURE 4.6.0 PRESSURE PORT LOCATIONS
FIGURE 4.6.1 FAN SPEED CONTROL POTENTIOMETERS
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POTENTIOMETERS ARE VISIBLE
AND ACCESSIBLE THROUGH THE
OPENING IN THE UNIT DOOR
NOTE: Adjust low
speed fan set-
tings by using the
potentiometers marked
“L”. Adjust high speed
fan settings by using the
potentiometers marked
with “H.”
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USE THESE TWO PRESSURE PORTS TO
CHECK PRESSURE DROP FOR THE RA
AIRSTREAM
USE THESE TWO PRESSURE PORTS TO
CHECK PRESSURE DROP FOR THE OA
AIRSTREAM
Balancing an airflow is done by setting the Outdoor Air fan speed and then adjusting the Return
Air fan speed to eject the same or somewhat less air to the outdoors.
Equipment required for testing airflows:
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A magnehelic gauge (or manometer) or other device capable of measuring 0–1.0 inches water
gauge of differential pressure.
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2 pieces of natural rubber latex tubing, 1/8" I.D., 1/16" wall thickness works best.
Manometers are relatively inexpensive devices that are readily available from online retailers;
accuracy within the range of 0–1.0 in. w.g. is the critical measure. Water manometers generally
have graduations of 0.1" that are difficult to accurately determine. For all manometers, there
are two plastic tubes that connect at the manometer and then the other ends go to pressure
ports on the EV Premium.
Individual differential static pressures (DP) are measured ACROSS the core, using the installed
pressure ports located on the removable door.
