Aprilaire 1830, 1850w Sequence of Operation, Dehumidifying the Fresh AIR, External Control

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VENTILATION (continued)

SEQUENCE OF OPERATION

When wired as shown in Figure 26, the ventilation damper will open whenever there is an HVAC heating (W), cooling (Y) or fan (Gs) call, allowing fresh air to be brought in when the HVAC blower is running (see VENTILATION WITH AN EXTERNAL CONTROL section below for exceptions). The ventilation damper will also open if the dehumidifier is operating. “VENTILATING” will show on the dehumidifier control when the dehumidifier is actively ventilating.. When the HVAC call ends, the dehumidifier stops, or after the set amount of ventilation time has been met, the ventilation damper will be closed..

If the set amount of ventilation time has not been met before the end of the one-hour cycle, the dehumidifier will turn on the ventilation damper along with the HVAC blower to ensure the desired ventilation time is satisfied..

If the dehumidifier has been set up to operate ventilation with outdoor temperature restrictions (AUTO-B, AUTO-C or AUTO-D – refer to page 20) then ventilation will be limited as described..

DEHUMIDIFYING THE FRESH AIR

When the dehumidifier is set up for single zone and there is no external control installed, the dehumidifier will turn on its blower and measure the RH of the air entering the dehumidifier during ventilation when ducted as shown in Figure 24.. If the relative humidity of the air entering the dehumidifier is higher than the setting, the dehumidifier compressor will turn to remove moisture..

VENTILATION WITH AN EXTERNAL CONTROL

When an external control is installed the dehumidifier will open the ventilation damper only when there is a cooling call (Y) or when the dehumidifier is operating, unless the ventilation need has not been met.. If the set amount of ventilation time has not been met before the end of the one-hour cycle, the dehumidifier will turn on the ventilation damper along with the HVAC blower to ensure the desired ventilation time is satisfied..

ADJUSTING VENTILATION TIME AFTER INITIAL SET UP

1.Press the UP or DOWN button to access the RH adjustment screen or to turn on the backlight if using an

External Control..

90-1854

2.Press the MODE button to toggle to the VENT TIME setting..

3. Press the UP or DOWN button to adjust the ventilation time (minutes).. After adjusted, press nothing else; the screen will return to home screen after three (3) seconds..

90-1854

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Contents Safety Instructions Installation InstructionsTable of Contents Specifications Crawl space, Sealed Attics or basement installations SET UP Dehumidifier for InstallationStandard basement and attic installations fully ducted Closet installationsDetach the on-board control by removing the four Control LocationTo move the control Minimum Circuit Capacity Hard WiringMinimum Wire Size AWG VoltageReattach the electrical service panel and side panel Hard WiringWiring Instructions Location Considerations Leveling Drain InstallationCondensate PAN, Condensate Pump and Float Switch Ducting Notes Ducting to Hvac System Basement and Attic InstallationsRequired Component DuctworkDuctwork Grilles with 10 Duct Collars Ducting to Hvac System Closet InstallationsOptional Component Optional ComponentsWhole-Home Primary Zone Installation Ducting for TWO Zone InstallationsCrawl SPACE/SEALED Attic Control External ControlWiring to Zone Dampers Wiring the Dehumidifier to the Hvac System and Zone DampersWiring to the Hvac System Optional W & Y WiringSystem SET-UP & Checkout DEH W/AC Zone90-1854selections External Control90-1854energized System SET-UP & CheckoutDehumidification Only Zoning and/or VentilationPress the ON/OFF button to turn the dehumidifier control on Crawl Space or Sealed Attic Remote Control Using ModelSampling will show on the display TWO Zone Primary and SecondaryVentilation Intake Hood AWG WireInstallation & Wiring Ventilation InstallationDehumidifier can ventilate in four modes Outdoor Temperature Sensor InstallationVentilation VENT-AUTO & VENT-TIMEDCFM Delivered Record the required CFMDetermine Fresh AIR Delivery Rate CFM RequiredRepeatedly until the Vent For 3 seconds to accessDisabled screen appears Ventilation with AN External Control Adjusting Ventilation Time After Initial SET UPSequence of Operation Dehumidifying the Fresh AIRDiagnostic Codes TroubleshootingDiagnostic Codes Troubleshooting Troubleshooting Guide Service Parts 10010759 B2206316A