Residential HRV/ERV
35
nearly a full-scale reading when the HRV/ERV is operating at high speed. Follow
the instructions supplied with the sensing units regarding proximity to elbows,
dampers, etc.
1. Hot-wire thermal anemometers provide a direct air velocity reading.
Balancing in a VentZone® system
The ZRT-2 models are equipped with
Aldes Constant Airflow Regulators to
automatically regulate airflow from
each terminal while the ventilator is
on and the ZRT is unpowered. When
the ZRT is powered open, the damper
opens and the EvacMAX™ mode is
enabled at the ventilator. This will
boost airflow at the powered ZRT,
while the self-balancing regulators
maintain the set flow rate at the
unpowered ZRTs.
1.
Finish sealing the ductwork system.
2.
Set all ZRTs to desired flow rate. Start by determining the required minimum
ventilation rate for each ZRT. Larger areas, or areas frequently used, may require
additional airflow in order for the system to perform as desired.
a.
The CAR-II : has three optional airflow rates; 10, 20, and 30 CFM. The default
setting is 10 CFM. To adjust the airflow rate, there are two clips inserted
into the which can be removed to increase the flow rate. Removing one
clip will increase from 10 to 20 CFM, and removing the second clip will
increase the airflow rate to 30 CFM. These rates can be changed at any
time after installation is complete, but rebalancing may be required.
b.
MR-Modulo : Remove the MR-Modulo from the damper and twist the
adjustment ring with the desired airflow is reached. Replace MR-Modulo.
c.
MR-Mono : The airflow cannot be adjusted, continue to step 3.
3.
Make sure all HRV/ERV components are in place and functioning properly. All ZRTs
should be OFF and in the closed position.
4.
Prepare the HRV/ERV and select the operating speed. VentZone® Systems typically
balance in LOW SPEED
Note: Due to the use of the constant airflow regulators, some effort needs to be
taken to balance the exhaust air rate to the operating point of the regulators.
5.
LOW SPEED can be activated by pressing the Mode Indicator button until the light
is solidly illuminated.
ZRT-2
CAR-II
Clips
CAR-II
Balancing the System
