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Y8150 FRESH AIR VENTILATION SYSTEM, W8150 FRESH AIR VENTILATION CONTROL
9 68-0282—07
HVAC fan is running all
the time
Device is set to override • Move switch to On position to allow for automatic operation.
Remote switch is on • Adjust remote switch to desired position.
Thermostat Fan switch is
in On position
• Normal operation.
HVAC system is running
to satisfy heating or
cooling requirements.
• Normal operation.
Ventilation limit is set to
100% ventilation limit.
• Set ventilation limit to 60%. The control may not be able to meet the
recommended ventilation requirements.
• Increase ventilation airflow through fresh air duct and adjust settings.
Low ventilation air flow. • See Problem: Not enough airflow.
• Damper does not
open during
checkout or
• Damper does not
close.
Incorrectly wired. • Check wiring connections per appropriate wiring diagram.
Transformer output. • Verify 24 Vac applied to actuator.
Damper actuator motor
failure or mechanical
failure.
• Manually open damper and verify free movement; damper should return
to closed position when no power is applied.
• If damper moves freely but does not operate when 24 volts is applied,
replace damper actuator.
• If damper does not move freely, replace fresh air damper.
Cooling compressor
comes on when there
is no cooling call from
the thermostat.
Incorrectly wired. • Check wiring connections per appropriate system diagram.
• An isolation relay may be required when appliances are connected to the
G
T terminals on the ventilation control. (For an example, see wiring a fan
for a steam humidifier diagram.)
Not enough airflow Obstruction or duct size • Check for obstructions in the fresh air duct and weather hood.
• Check for kinks in ductwork.
• Make sure all manual dampers are fully open.
• Make sure the stops on the EARD damper allow it to open fully.
• Increase duct size.
• Add a booster fan to the fresh air duct.
NOTE: After any changes to the ductwork, repeat the Measuring Airflow
section.
Problem Possible cause What to do