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HE-Series Outdoor
ERV
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, any
dampers will first move into their correct operating positions and then 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. After any dampers have moved into
their correct positions, power is then applied to the motor contactors and the fans will begin
running.
6.4 MEASURING AIRFLOW
Airflow should be occurring in both airstreams. Sometimes the easiest place to confirm that air
is moving is at the weatherhoods.
If exact airflow is critical, it may be desirable to permanently install flow measuring stations and
manometers in the ductwork connected to the unit. These also can be used to determine when
filters should be cleaned or changed.
Equipment Required
u
A magnehelic gauge or other device capable of measuring 0–1.5 in. water of differential
pressure.
u
2 pieces of natural rubber latex tubing, 1/8" ID, 1/16" Wall works the best.
Procedure:
The individual differential static pressures (DSP) can be measured using the installed pressure
ports located in the front of the units core access doors.
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.
OPERATION
It is important to balance the airflows after the unit is operational and all ductwork has been installed.
Balancing the airflows is typically required by state and/or local codes, and is often specified by the
HVAC design engineer.
Optimum efficiency of the enthalpic cores is achieved when the airstreams are properly balanced.
IMPORTANT
NOTE: The tubing
should extend in
the pressure port
approx. 1".
NOTE: Make sure
clean filters are
installed before
balancing airflow. Dirty
or clogged filters reduce
airflow through the unit.
NOTE: ERV airflows
are to be balanced
after all ductwork is
installed. Balancing of air-
flows is typically required by
local or state building codes
or by the HVAC design
engineer.
