21
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EV-Series Indoor
ERV
OPERATION
NOTE: The tubing
should extend in
the pressure port
approx. 1".
NOTE: These
ports are carefully
located on the unit
to give the most accurate
airflow measurement.
Do not relocate pressure
ports.
DIFFERENTIAL STATIC ACROSS CORE DSP VS. CFM
EV
450I
N
DP (H
2
O)
DSP 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65
Fresh Air (FA) CFM 190 230 275 315 360 400 445 485 530 570
Room Air (RA) CFM 190 230 275 315 360 400 445 485 530 570
6.4 MEASURING AIRFLOW
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.
FIGURE 6.4.0 AIRFLOW DIAGRAM, EV450IN
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PRESSURE PORTS (4)
6.3 UNIT START-UP
6.3.1 Fixed-Speed Units
Most fixed-speed units do not have any external controlling signals and only require turning on
the disconnect switch, located on the E-Box. When the disconnect switch is turned ON, power
is suppled to the motor contactors, causing the fans to run.
Some fixed-speed units are wired to receive an actuating signal from an external source.
If there is an external actuating signal source, verify the type of signal and that it is wired
according to the low-voltage wiring diagrams found in Section 5.5 of this manual. Turn on the
disconnect switch and then turn ON the actuating device. Power is then applied to the motor
contactors and the fans will begin running.
NOTE: Make sure
clean filters are
installed before
balancing airflow. Dirty
or clogged filters reduce
airflow through the unit.