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4
1. DEFROSTING MODE
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 unit shifts to maximum speed and the dampers close.
After defrosting, the unit returns to the operating mode selected by the user.
2. CONTROLS
2.1 BOOTING SEQUENCES
HRV160 ECM AND ERV 140 ECM UNITS ONLY
The unit 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 integrated control LED will light AMBER for 10 seconds.
After that, the LED will light RED for the rest of the booting sequence. During this RED light
phase, the unit is checking and resetting the motorized damper position.
Once the motorized damper position completely set, the RED light turns off and the booting
sequence is done.
NOTE: No command will be taken until the unit is fully booted.
HRV160 UNIT ONLY
The unit 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 integrated control LED will light GREEN (unit set in
normal defrost) or AMBER (unit set in extended defrost) for 3 seconds, and then will shut
off for 2 seconds. After that, the LED will light RED for the rest of the booting sequence.
During this RED light phase, the unit is checking and resetting the motorized damper
position.Once the motorized damper position completely set, the RED light turns off and
the booting sequence is done.
NOTE: No command will be taken until the unit is fully booted.
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