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OPERATION
NOTES:
T:Run time per hour of user setting at timer knob.
When the unit is running at air exchange mode,the OA damper and RA damper are opened, and the circulation damper is closed.
When the unit is running at circulation mode,the OA damper and RA damper are closed and the circulation damper is opened.
f.FILTER SERVICE INDICATOR
The filters should be cleaned/replaced at a minimum of every 6 months (depending on outdoor air conditions). The red L1 led indicator light will
illuminate continuously and will buzz once a second in 15 seconds every 2 hours after 6 months of motor operation. This indicates that it is time to
clean/replace the filters. After servicing the filters, press and hold the filter reset button for 5 seconds. Four quick beeps will indicate that the filter service
indicator has successfully been reset. To deactivate the buzzer, press the filter reset button once. Two quick beeps will indicate that the buzzer has
successfully been deactivated. Re-activate it by pressing the button once more.
BALANCING INSTRUCTIONS
Balancing the airflow is done by setting the OA fan speed and the RA fan speed to exhaust the same or similar airflow from and to the outdoors. Inspect
your installation to be sure all duct work is correctly installed, sealed, and clean filters are in place. The entire air delivery duct system needs to be in
place and all vents should be in their normal operating position. keep the MOS switch off,plug the unit in to a 120V power outlet,after two minute, L1
and L2 turn off, and the unit runs per the user settings.
EQUIPMENT REQUIRED FOR TESTING AIRFLOWS:
• A magnehelic gauge (or manometer) or other device capable of measuring 0 to 0.6 inches water gauge of differential pressure.
• 2 pieces of tubing, 1/8" I.D., 1/16" wall thickness works best.Individual differential static pressures (DP) are measured ACROSS the core, using the
installed pressure ports located on the removable door.
• Keep the MOS off so the unit will run at low speed. Open the pressure port caps for the OA air stream and insert the tubing into the ports about 1".
Take a DP reading and record it in section 1. Adjust the OA fan speed control to obtain the desired CFM per the table in section 2. Enter the CFM
information in the box in Section 2. Remove the tubing, close the pressure port caps, and then repeat the process for the RA air stream.
NOTES:
After 30 days of unit operation, check / tighten all mounting and support hardware. Inspect filters for cleanliness. If filters appear dirty, replace or clean
them.
Whenever there is a reconfiguration of the HVAC system in a residence, the speed controls should be recalibrated for optimum performance. If the
residence undergoes significant structural changes, such as an addition to the home, the unit should also be recalibrated. If optional MERV 13 filters are
installed, recalibration is also required.
The unit provide the ability to deliver completely balanced airflows, or to modify them as desired. In a perfect environment, airflows would be balanced
so that there is no difference between OA airflow and RA airflow. Many owners will prefer to have a slight imbalance, providing a slight excess of OA to
reduce air infiltration into a home. Some homes may require an imbalance because a furnace or water heater is not direct-vented. If needed,an HVAC
professional will be able to advise balance settings that will best address the circumstances in each home.
1. MANOMETER READINGS AT COMMISSIONING
Return Air Pressure Port
Exhaust Air Pressure Port
Outside Air Pressure Port
Supply Air Pressure Port
2. PRESSURE DROP TO AIRFLOW CONVERSION TABLE
Outside Air Flow:
Pressure ports
In. w.g.:
In. w.g.:
In. w.g.:
In. w.g.:
Core Pressure Drop
(In. W.G.)
Standard Filters (CFM)
0.1
0.2
0.3
0.4
0.5
0.6
CFM
Use these two pressure
ports to check pressure
drop for the OA air stream
Use these two pressure
ports to check pressure
drop for the RA air stream
Pressure Drop:
Pressure Drop:
Airflow w/
Airflow w/
MERV 13 Filter (CFM)
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-
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-
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Return Air Flow:
3
Potentiometers are visible
and accessible through the
opening in the unit door
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CFM
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