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PrecisionSYNC Control (435244)
The control offers the most advanced features to control your home’s ventilation.
• Five-speed fan setting
• Standby setting (fan speed 0)
• Electronic dehumidistat
• 20/40/60 HIGH speed override button
• Compatible with Wireless Timer
• Easy to read back-lit LCD screen
• Slim-line design
• Connect to 3-wire 20 gauge low voltage wire
• Precision Balancing (applicable units)*
Table 8. Operational Modes
Function Icon
Continuous Ventilation
20 Minutes On, 40 Minutes Recirculation
20 Minutes On, 40 Minutes OFF
10 Minutes On, 50 Minutes OFF
Continuous Recirculation
Table 9. PrecisionSYNC Control (435244) Settings
Mode Icon Description
Turning on the Control Press and release the ON/OFF button. The light above will illuminate.
Setting the Ventilation
Speed
Press and release the Fan button to select LOW or HIGH fan speed. The corresponding
“Indicator Light” will illuminate. If both LO and Hi indicator lights are off, the fan is OFF but
will turn ON if required by the Dehumidistat or remote Timer (if installed).
20/40/60 High Speed
Button
Press and release the 20/40/60 High Speed button to temporarily initiate HIGH Fan speed
for 20, 40 or 60 minutes. Press once for 20 minutes, twice for 40 minutes, three times for
60 minutes and four times to disable. The timer symbol will appear on the screen and the
corresponding section of the clock will flash to indicate the time interval selected. When
the timer runs out, the unit will return to its previous operating speed.
Setting the
Mode of Operation
There are five modes of operation available with the PrecisionSYNC Control (435244).
Pressing the Mode button will display the different modes of operation on the screen. Fan
defrost models do not have recirculation modes available.
Setting the Dehumidistat
The PrecisionSYNC Control displays the current indoor humidity in LARGE numbers and
the Dehumidistat setting in SMALL numbers on the screen. If the indoor humidity is above
the set point, the control will initiate HIGH Fan speed operation in Ventilation mode until the
indoor humidity has been reduced below the set point.
Press and release the Dehumidistat button to adjust the Dehumidistat setting. The
Dehumidistat can be set between 25% RH and 60% RH. To disable the Dehumidistat
function on the control, cycle through the setting until OFF is displayed. Refer to “How
the Dehumidistat Works” on page 10 in this instruction for a detailed description of the
Dehumidistat function.
Reset Button RESET
The RESET button will clear the current Fan, Timer, Mode and Dehumidistat settings and
set the unit into LOW fan speed, Ventilation mode and a Dehumidistat setting of 40%.
Service Indicator
A service indicator appears when the unit requires routine maintenance. Press and hold the
ON/OFF button for 5 seconds to reset the service indicator once maintenance has been
performed.
*Refer to “Precision Balancing” on page 31.
Figure 7. PrecisionSYNC Control
Residential Energy Recovery Ventilators 12
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