Troubleshooting Guide - Aprilaire 1700 Safety And Installation Instructions Manual

TROUBLESHOOTING GUIDE

SYMPTOM
The dehumidifier damper does
not open in "TEST" Mode
The ventilation damper does
not open when the HVAC
blower is active.
The fan turns on unexpectedly
HVAC blower does not turn on
when cycle time potentiometer
is in "TEST" mode
Air cycling operates
continuously after the
potentiometer is taken off
"TEST" mode
The dehumidifier does not run
14
TROUBLESHOOTING PROCEDURE
• Follow all of the system checkout procedures.
• Check the wiring diagram for the damper & 24 VAC transformer.
• The damper will not open if the cycle time within the current period has already
been met. For instance if the cycle time is set to 5 minutes and the control has
already ventilated for 5 minutes in that interval, the damper will remain closed.
• If the outdoor temperature is below 0°F or above 100°F, the damper will remain
closed for energy efficiency.
• If using the Outdoor Temperature Sensor, check that it is installed in the Fresh
Air Intake a maximum of 3 feet from the outside, or on the North, East or West
side of the house. (Not in direct sunlight.)
• The control will turn on the fan as needed to meet the air cycling
requirements determined by the cycle time and cycle period settings.
• Make sure there is power to the HVAC equipment.
• Check the wiring diagram for the R, C, W, Y, G
equipment, thermostat, and the dehumidifier.
• Make sure the supplied Temperature 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 22 VAC minimum – 30 VAC maximum.
• In "TEST" Mode, the HVAC blower will activate for 1 minute, DO NOT LEAVE
IN TEST MODE AS DEHUMIDIFIER WILL NOT OPERATE.
• If the HVAC equipment is making a Heat or Cool call, or the fan is in
Continuous Operation, air 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, air
cycling will be on continuously. Change the setting to a lower amount if this is
not desired.
• Follow all of the system checkout procedures.
• Check that the power switch on the dehumidifier is on.
• Check that the circuit breaker is not tripped. The dehumidifier requires a
minimum of 9 amps. It is recommended the dehumidifier be placed on its
own dedicated 15 amp circuit.
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