Aprilaire 1750A Dehumidifier User Manual


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CONVERTIBLE INSTALLATION (CONTINUED)
•HVACFANON:ActivatingtheHVACfanduringWhole-Home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. During spot dehumidification, the HVAC fan will
not be turned on regardless of the position of the switch. 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.
•CYCLETIME:ThecycletimepotentiometermustbesettoOFFforproper
operation.
FIGURE 18 – Convertible DIP Switch Settings
90-1538
ON
1 2 3 44321
ON
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
VENT-TIMED
HVAC FAN ON
2 HOUR
3 HOUR
30 MIN.
1 HOUR
SYSTEM SETUP
CYCLE PERIOD
EXTERNAL
CONVERTIBLE
LOCAL
MIN.
30
MIN
MIN.
600
CYCLE TIME
TEST
OFF
DIP SWITCH CONFIGURATION
•Whole-HomesamplingwilloccurwiththefirstHVACfan(Gs)callwithintheCyclePeriodandwilloverrideSpotdehumidification.
•AttheonsetofWhole-Home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.
•IfaWhole-Homesamplingdoesnotoccur,SpotsamplingwilloccurattheendoftheCyclePeriod,ifnotactivelydehumidifyingthewhole-
home. At the onset of spot sampling, 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 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.
•Afterthedehumidifierblowerhasturnedoff,oneminutemustelapsebeforeitcanbeturnedonagain(i.e.,followingaWhole-Home
sampling). If one minute has not elapsed, the Status LED will flash and the dehumidifier blower will turn on after one minute.
SEQUENCE OF OPERATION
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