Aprilaire dehumidifier 1700 ユーザーズマニュアル

Dehumidifier is not
draining properly.

• Check condensate trap to be sure it is clear.

• Check drain line for continuous slope.

Dehumidifier is producing
hot air.

• Reheat of outgoing air will cause a temperature increase across the dehumidifier.

• Unit will possibly run continuously initially. After unit has “dried” home,

dehumidifier will cycle, reducing load.

HVAC fan does not turn 
on when cycle time dial is 
in “TEST” mode.

• Make sure there is power to the HVAC equipment.

• Check the wiring diagram for the R, C, W, Y, GH, and GS at the HVAC equipment,

thermostat, and the dehumidifier.

• Make sure the sensor is connected to the Outdoor Temperature Sensor terminals

or the System Setup block is set to “TIMED” mode.

• Check the voltage across the R and C terminals at the dehumidifier. Voltage

should be 18 VAC minimum - 30 VAC maximum.

• In “TEST” Mode, the HVAC fan will activate for 1 minute, DO NOT LEAVE IN TEST

MODE AS DEHUMIDIFIER WILL NOT OPERATE.

Dehumidifier Blower is running,
but no airflow.

• Normally Open Damper was used instead of Normally Closed Damper in backflow.

• Total HVAC system static is higher than 0.8” w.c.

Dehumidifier not adequately
dehumidifying.

• Unit will need time to “dry” materials in home before effectively changing RH.

• Too little airflow through dehumidifier.

• Total HVAC system static is higher than 0.8” w.c.

• Compressor is not turning on.

• System undercharged.

The dehumidifier damper does
not open in “TEST” Mode.

• Follow all of the system checkout procedures.

• Check the wiring diagram for the damper and 24 VAC transformers. 

Fan cycling operates 
continuously after the dial 
is taken off “TEST” mode.

• If the HVAC equipment is making a Heat or Cool call, or the fan is in Continuous

Operation, fan cycling will remain on until the requirement set by the cycle
period dip switch and knob is met.

• If the interval is set at 1 HOUR and the cycle time is set at 60 minutes, fan

cycling will be on continuously. Change the setting to a lower amount if this is
not desired.