Honeywell W8150 User Manual page 9

Problem
HVAC fan is running all Device is set to override
the time
Remote switch is on
Thermostat Fan switch is
in On position
HVAC system is running
to satisfy heating or
cooling requirements.
Ventilation limit is set to
100% ventilation limit.
Low ventilation air flow.
• Damper does not Incorrectly wired.
open during
Transformer output.
checkout or
Damper actuator motor
• Damper does not
failure or mechanical
close.
failure.
Cooling compressor Incorrectly wired.
comes on when there
is no cooling call from
the thermostat.
Not enough airflow Obstruction or duct size
Y8150 FRESH AIR VENTILATION SYSTEM, W8150 FRESH AIR VENTILATION CONTROL
Possible cause
• Move switch to On position to allow for automatic operation.
• Adjust remote switch to desired position.
• Normal operation.
• Normal operation.
• 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.
• See Problem: Not enough airflow.
• Check wiring connections per appropriate wiring diagram.
• Verify 24 Vac applied to actuator.
• 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.
• Check wiring connections per appropriate system diagram.
• An isolation relay may be required when appliances are connected to the
G
for a steam humidifier diagram.)
• 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
terminals on the ventilation control. (For an example, see wiring a fan
T
section.
9
What to do
68-0282—07