Aprilaire 1700 - Manual (Page 14)

14
TROUBLESHOOTING GUIDE
SYMPTOM TROUBLESHOOTING PROCEDURE / POSSIBLE REASON
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.