The airflow on the SYNC-110SE-S1 units can be adjusted up or down. The unit must
be running for speed alterations to be made.
1. Set the unit to the speed which is to be adjusted.
2. Locate the ECM circuit board which is under the metal cover on the side of the
unit.
3. Hold both buttons (S1 and S2) at the same time for 6 seconds until the LED lights
illuminate.
4. Press UP button (S1) or DOWN button (S2) to adjust the motor speed. Press the
button multiple times for larger increases. The LEDs will indicate whether the fan
speed is at the Factory Set speed (F. SET), above (HIGH), or below (LOW).
5. When the desired airflow has been reached no further action is required and the
metal cover can be fastened back on. This process may be repeated for any of the
available speeds.
Balancing the airflows is critical to ensure that the amount of air coming into the building equals the amount of air exhausted to the
outside of the building. If these two airflows are not properly balanced, the following issues may occur:
• A positive or negative pressure in the house
• ERV will not operate at its maximum efficiency
• ERV will not defrost properly
The ASSURE-120S-S1 and SYNC-110SE-S1 are considered “factory balanced”. Due to the design of the unit, if the supply and
exhaust static pressure of the duct installation are within 0.3 (in w.g.) of each other, the supply and exhaust airflows will be within 10%
of each other. These units, therefore, do not require balancing during installation if these conditions are met. If these conditions are not
met then follow the manual balancing procedure below.
The SYNC-180SCE-S1 and SYNC-270TCE-S1 should be balanced using the Auto Balance feature of the PrecisionSYNC Control
(435244).
Airflow Measuring Gauge:
• A digital manometer is a suitable instrument for the balancing of airflows.
Gauge Attachments:
When sampling an airflow, various attachments are available for use on a digital
manometer. The illustration below shows a digital manometer with a pitot tube
attachment. This combination will measure the system air velocity pressure accurately,
regardless of the duct size or shape (either round or rectangular).
Balancing Preparation:
Prior to performing the air balancing procedure, perform the following steps:
1. Seal the ductwork.
2. Confirm the installation and proper operation of all the components of the ERV.
3. Fully open the balancing dampers.
4. Turn off all household exhaust devices (range hood, clothes dryer, bathroom fans).
5. Set the system at high speed.
6. Prior to balancing the unit, first adjust airflows in the branch lines to specific areas of the house.
7. If the outdoor temperature is below 0°C (32°F), ensure the unit is not running in defrost.
8. If the system is a Simplified or Partially Dedicated installation, operate the furnace/air handler at high speed.
Adjusting the EC Motor (SYNC-110SE-S1)
Balancing the Airflows
Manual Balancing
DOWN
UP
10065
ECM01
S1
S2
T1
T2
T3
LO
W
F.SET
HIGH
PWM
GND
GND
UNITS
ON
OFF
ZERO
DUCT
AIR
FLOW
Digital
Manometer
Pitot Tube
ATTENTION
Continuous, excessive, positive pressure may drive moist indoor air into the external walls of the building. Once inside the external walls,
moist air may condense (in cold weather) and degrade structural components or cause locks to freeze.
Continuous, excessive, negative pressure may have several undesirable effects. In some geographic locations, soil gases such as methane
and radon gas may be drawn into the home through basement or ground contact areas and may also cause the backdrafiting of vented
combustion equipment.
Figure 40. EC Motor Adjusting Circuit Board
Figure 41. Manual Balancing
Residential Energy Recovery Ventilators
29
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