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RECOMMENDED MAINTENANCE
Depending on use, but no longer than once a year, Atmosphere recommend cleaning the clothes
dryer exhaust vent. On an annual basis make sure that exhaust hood flapper or backdraft damper
are clean of lint and moves freely. The DBF-DEDPV motor is maintenance free. If the DBF-DEDPV
is not functioning as it should, perform the calibration procedure. (See calibration instructions for
complete details)
Fan impeller may accumulate lint. Periodic inspection, based upon clothes dryer usage, should be
performed to ensure that it is not obstructed or loaded with lint.
To inspect and clean the impeller :
• Turn off power at the source
• Remove the fan unit from the housing of the DBF-DEDPV and clean any lint buildup
on the impeller and near the inlet and outlet.
• Reinstall the fan unit. Turn power back on and recalibrate the unit. (See calibration
instructions for complete details)
TROUBLESHOOTING
IMPORTANT — All faults are indicated by a different flashing indicator light or no lights at all on
the notification panel. All faults must be investigated as outlined below and the DBF-DEDPV must
only be turned on once a thorough investigation of the clothes dryer and vent system has been
performed by authorized service provider. Perform DBF-DEDPV calibration procedure to clear any
faults once investigation is complete.
No Indicator Light | DBF-DEDPV not operating when clothes dryer runs.
• The DBF-DEDPV is interlocked to the dryer by sensing the pressure inside the exhaust
duct when the dryer turns on.
• Clothes dryers are equipped with operating temperature controls that monitor drying
temperatures. Maximum exhaust temperatures should not exceed 167° F. If the safety
thermal fuse in the DBF-DEDPV trips, the clothes dryer is operating outside standard
code limits. Contact the clothes dryer manufacturer or authorized service provider and
replace the DBF-DEDPV.
• If the clothes dryer is operating normally, and there is no green indicator light on the
notification panel, stop the clothes dryer immediately and have the vent system
inspected and cleaned by an authorized service provider.
PRESSURE FAULT MODE (Flashing orange indicator light)
If at any time during the calibration or operating cycle of the DBF-DEDPV and the clothes dryer
there is excessive positive pressure of +0.16" W.C. sensed for more than four minutes, the notifi-
cation panel will show a flashing orange indicator light. Stop the clothes dryer immediately. Have
the vent system inspected and cleaned by an authorized service provider. This is an indication of
excessive back pressure in the vent system
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