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QUEST 335
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
QUESTCLIMATE.COM
(877) 420-1330
5. CONTROL OPTIONS
The Quest 335 Dehumidifier can be controlled by its on board dehumidistat or with an external control
using its low voltage terminal block.
5.1A QUEST 335 ON BOARD DEHUMIDISTAT
Off Mode: Fan, Compressor, Display and all LEDs are off
To Turn Unit On: Press the power button
On Mode: Display is on and shows the set point (Initial set point: 55% RH)
To Change Set Point:
• Press the up or down arrow once, the 2-digit display will begin to blink.
• Adjust to desired RH. Each push of the button will change the SP 1% RH.
• After 6 seconds without a button being pushed the number showing will become the new SP
DEFROST LIGHT
• The light over the snowflake will light up when defrost is occurring (ice is detected on coils). The
fan will be on, and the compressor will be off during defrost.
FILTER RESET
• Filter reset button will light up after the fan has been running for 2,000 hours, or if the pressure
switch detects excessive pressure build-up indicating that the filter must be changed.
• After changing the filter, press and hold the filter reset button to reset the 2,000-hour timer. Light
flashes while button is held.
DARK MODE
• Press the Dark Mode button to activate Dark Mode.
• Once Dark Mode is activated, lights will remain on for 20 seconds before the unit’s hygrostat will go
dark. Dark Mode light will flash for 3 seconds before unit goes dark.
• Unit will temporarily leave dark mode when any button is pushed and will go dark 20 seconds after
the last button is pushed.
• To turn off Dark Mode, press the Dark Mode button and ensure light above Dark Mode button is off.
• This mode is for applications where the user would like the unit to operate without emitting any light.
