Aprilaire 1750A Dehumidifier User Manual


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WHOLE-HOME INSTALLATION (CONTINUED)
•HVACFANON:ActivatingtheHVACfanduringdehumidificationis
recommended because it offers better circulation and balancing of indoor air
conditions. Running the HVAC fan during dehumidification does not affect
moisture removal efficiency. If the switch is put in the HVAC FAN OFF position,
air is pulled through the unit, dehumidified, and circulated solely by the
dehumidifier blower.
•CYCLEPERIOD:Thisdetermineshowfrequentlythedehumidifierwillsample
the air to check the humidity level. Set to 1 hour and adjust as needed.
•ForVentilationswitchsettings,seeVENTILATIONsectionbeginningonpage12.
•ForLocal/Externalswitchsetting,seeTHIRD-PARTYCONTROLonpage17.
FIGURE 13 – Whole-Home DIP Switch Settings
90-1538
LOCAL
CONVERTIBLE
EXTERNAL
CYCLE PERIOD
SYSTEM SETUP
1 HOUR
30 MIN.
3 HOUR
2 HOUR
HVAC FAN ON
VENT-TIMED
VENT-AUTO
WHL HOUSE
HVAC FAN OFF
ON
1 2 3 4 4321
ON
•SamplingwilloccuroncewithintheCyclePeriod.SamplingisinitiatedwiththefirstHVACfan(Gs)callorattheendoftheCyclePeriodif
a HVAC fan call is not received within the Cycle Period. At the onset of sampling, the dehumidifier damper output turns on, the dehumidifier
blower turns on, and the green Status LED flashes.
•Afterthreeminutes,thedewpointoftheincomingairismeasuredandcomparedtothesetpointonthecontrolknob.Ifthedewpointofthe
incoming air is above the set point, the compressor turns on and the green Status LED switches to solid illumination. If the dew point is below
the set point, the dehumidifier damper output turns off and the dehumidifier blower turns off along with the green Status LED.
•Thedewpointoftheincomingairiscontinuouslymonitoredduringcompressoroperation.Whenthedewpointoftheincomingairfallsbelow
the set point on the control knob, the dehumidifier damper output turns off and the dehumidifier compressor and blower turn off along with
the green Status LED.
SEQUENCE OF OPERATION
DIP SWITCH CONFIGURATION
SPOT INSTALLATION
In this installation the dehumidifier is not ducted to the HVAC system and is used to
dehumidify a specific area. This installation is typically used in basements or crawl
spaces. The dehumidifier can remain non-ducted, however, to achieve specified
performance it is recommended that the dehumidifier be ducted to the area requiring
dehumidification. When ducted, grilles should be installed on the inlet and outlet
to increase the pressure drop across the unit. 10 feet is the recommended distance
between inlet and outlet grilles.
Required Components
Duct Work
Grilles with 8” duct collars
Optional Components
Condensate Pan & Normally Closed Float Switch
Model 70 Living Space Control
Third-Party Control
8
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