Precision balancing enables the installer to dial in precise airflow to meet design and code requirements and the units will maintain the
airflows through auto balancing after they are set.
Precision Balancing
Fan speed
indicator
– speeds O
to 5
Flashes to indicate
MAX installation
airflows
Saves user
selected
airflows
(CFM)
Selects
fan speed
Exhaust
Airflow
(CFM)
– user
selection
Switches
between
Supply
and
Exhaust
Supply
Airflow
(CFM)
– user
selection
Dials up
CFM
Dials down
CFM
Exit Auto
Balance
screen
Balance
Indicator
– will
spin to indicate
when there is
more than 10 CFM
difference between
supply and
exhaust airflows
1. Power the ERV and allow Self Test to complete. Self test takes approximately one minute in duration.
2. Press the power button to turn on the PrecisionSYNC Control (435244).
3. Simultaneously press and hold the fan and gear buttons for 5 seconds until the screen changes and “Auto Balance”
appears, then release the buttons.
Do not attempt to operate the PrecisionSYNC Control (435244) once the buttons are released. For approximately 15 seconds the
ERV will test for its installation maximum supply and exhaust airflows. The maximum airflows will be displayed for approximately
10 seconds. “MAX” will flash during this time. Speed 5 will then be displayed and “MAX” will no longer appear on the screen.
The maximum supply and exhaust airflows values (CFM) are the maximum values (CFM) that units speeds 1 to 5 can be set to.
Repeat this step if “Man Balance”* is shown.
4. Once speed 5 is displayed, select the airflow (supply or exhaust) to be adjusted by pressing the timer button . “SUPPLY” or
“EXHAUST” will flash, indicating which airflow is selected for adjustment.
5. Press the gear button to increase the value (CFM) of the selected airflow until the target value (CFM) is reached. Press the
water drop button to decrease the value (CFM) of the selected airflow until the target value (CFM) is reached. Once the target
value (CFM) has been reached, the fans will adjust to meet the target value (CFM). Pause until the airflow values (CFM) have
stabilized.
Airflow values (CFM) increase and decrease in increments of 5 CFM. CFM fluctuations of +/- 10 CFM from target is acceptable.
A Balance Indicator icon is located to the right of the fan speed. The Balance Indicator icon will spin to indicate when
there is more than 10 CFM difference between supply and exhaust airflows.
6. Once both the supply and exhaust airflows have stabilized to the target values, press the power button to save the settings.
No changes will be saved unless the power button is pressed before exiting the Auto Balance Screen. Saving the settings can
be done at any time. Saving the settings after setting all 5 speeds is sufficient, however it is recommended to save after setting
each speed, beginning with speed 5.
7. Press the fan button to switch to the other 4 speeds and adjust using steps 4-6.
When switching fan speeds, the ERV will take approximately 5 seconds to identify the default airflow values (CFM) before
displaying it. Note: All speeds do not have to be adjusted. After speed 5 is adjusted, speeds 1 to 4 will adjust proportionally to
the selected speed 5 value, for both airflows. These default values can be overridden if desired by setting speeds 1 to speed 4
following steps 4-6.
8. To exit auto balance mode and return to the main screen press the RESET button.
After approximately 3 seconds the screen will change back to the main screen. The screen will display “Auto Balance”. If this is
not shown, restart from step 3.
Over time, if the unit is unable to remain balanced “Auto Balance” will no longer appear on the main screen and the unit will run
its five speeds at factory default. The unit will continuously adjust to maintain selected airflow values.
* Man Balance is used for diagnostic purposes only.
NOTE
Should any unexpected behavior occur on the Auto Balance Screen or on the ERV, disconnect the ERV from the outlet, wait approximately
30 seconds and start from step 1.
Applicable units:
SYNC-180SCE-S1 and SYNC-270TCE-S1
Note: PrecisionSYNC Control MUST be used
for Precision Balancing
Figure 42. PrecisionSYNC Control Auto Balance Function
Residential Energy Recovery Ventilators
31
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