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1. defrostinG Mode
4
When the outdoor temperature is below 23°F, recovery of heat in HRV units creates frost in
the core. For ERV units, when the outdoor temperature is below 14°F, recovery of energy
creates frost in the core.
To maintain its proper operation, the unit is programmed to defrost the recovery core. The
defrost frequency varies according to the outdoor temperature.
During the defrost cycle, the dampers of the unit close but the unit speed can be set on high
or low, according to your needs, using the VT9W main wall control. Refer to the Main and
auxiliary wall controls user guide (included with your unit and also available
at www.broan.com) for more details.
After defrosting, the unit returns to the operating mode selected by the user.
2. bootinG seqUence
The unit and VT9W wall control booting sequence is similar to a personal computer booting
sequence.
Each time the unit is plugged after being unplugged, or a power failure occurs, the unit will
perform a 30-second booting sequence before starting to operate.
During the booting sequence, the unit is checking and resetting the motorized damper
position, while the VT9W wall control screen displays 5%, 10%, 15%, etc. (up to 100%).
Once the motorized damper position completely set, the booting sequence is done.
NOTE: No command will be taken until the unit is fully booted.
3. Main and aUxiliary controls
The only main control compatible with these units is the VT9W (purchase separately).
Only one main control can be connected per unit.
Up to five VBATHW push button auxiliary controls can be used.
NOTE: When used, the VBATHW activation will override
the VT9W operation, as well as the unit defrost cycle.
The chronometer icon appears on VT9W screen as
long as the VBATHW is activated.
For more information about your unit controls, refer to the
Main and auxiliary wall controls user guide (included with your unit and also available at
www.broan.com).
CONT
VQ0137
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