Specifications

Remote Wall Control
Remote mounted wall control options are solid state con-
trols that can be used to control the ventilators from a
remote location. The connection from the ventilator to the
control is low voltage and requires a four conductor (24
gauge minimum) LVT cable. Models are available with a
dehumidistat control and speed switching. The following
three options are available:
Standard Wall Control
Dehumidistat to engage high speed exchange. Slide switch
operation supporting continuous low exchange and con-
tinuous high exchange.
Xtra Wall Control
Dehumidistat to engage high speed exchange. Electronic
push button operation supporting intermittent (standby)
ventilation, continuous low exchange, continuous high
exchange, maintenance indicator light and exchange indi-
cator light.
Aqua Air Wall Control
Ideal for pool dehumidification. Dehumidistat to engage
high speed exchange. Electronic push button operation
supporting intermittent (standby) ventilation, continuous
low exchange, continuous high exchange, maintenance
indicator light and exchange indicator light.
Airflow Measurement and Balancing
Once installation is complete, the supply and exhaust air-
flows should be balanced to ensure proper operation and
a good quality installation. A well designed duct system
with properly sized duct runs and equal static pressure
losses of both the supply and exhaust will aid in airflow
balancing. However, it will be necessary to take flow
measurements using AMCA suggested methods. The
recommended methods would be a velocity traverse mea-
surement or flow measuring stations (FMS) installed in the
ducts with magnehelic pressure gauges.
Flow Measuring Station Positions
It is important to locate the FMS in the ‘warm side’ duct-
work to minimize the effect of differences in air density,
especially when balancing during extremely cold outside
conditions. Air density variations can affect the FMS by
more than 15%. The FMS should be located downstream
from straight sections of duct and not immediately after
fans or obstructions that will cause turbulent flow. Flow
control or balancing dampers should be installed down-
stream from the FMS so flow through the FMS is not
disturbed. Dampers can then be adjusted to equalize flow
rates in the ducts.
Whether flow stations are permanently installed or used
temporarily, the position they are placed in is very impor-
tant to ensure accuracy as shown in Appendix C. The best
locations for mounting the FMS is in the long straight sec-
tions of ducting where airflow has stabilized across the
area of the duct. This position will provide the most accu-
rate measurements.
The next best location for the FMS is immediately before
or after a 90 degree elbow and 12” [305 mm] from any
damper. In straight sections of pipe, the FMS should be
installed at least 30” [762 mm] from any fan outlet. This
applies to the supply air opening connection on the HRV
and the exhaust air opening connection.
With airflow measuring stations permanently installed,
balancing is done by measuring airflow on one side of the
HRV and then the other. Adjustments can then be made
to the damper to equalize airflows.
When using the temporary method, an FMS is installed in
one air duct of the HRV and the flow recorded. The FMS
is then relocated to the other air duct and the airflow is
recorded again. Dampers can then be adjusted to equalize
airflow. This procedure should be repeated to ensure that
the unit is balanced properly.
VCES-HRV-IOM-1C – HRV600i, HRV700i, HRV1200i
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