Aprilaire 1770A - Remote Control for Crawl Spaces

MODEL 76 REMOTE CONTROL FOR CRAWL SPACES
WIRING & DIP SWITCH CONFIGURATION
When used as a remote control, the Model 76 can be installed in any
convenient location within the living space while the dehumidifier is
installed in an inconvenient or difficult to access area that is going
to be dehumidified, such as a crawl space, sealed attic, or basement
(if getting to the basement is inconvenient or difficult for the owner).
The dryness level is set on the Model 76 control and communicated
to the dehumidifier, which then dehumidifies the area to that setting.
The dehumidifier communicates the measured humidity level (%RH)
in the space where it is located to the Model 76 Control, where it
is displayed. The dehumidifier can be turned on and off using the
ON/OFF buttons of the Model 76 Control. Refer to the Model 76
Installation Instructions for mounting and operating instructions. The
dehumidifier control knob can only be used to initiate Test Mode
when a Model 76 is connected.
FIGURE 30 – Model 76 Remote Control
DIP Switch Configuration
90-1538
LOCAL
PRIMARY/SECONDARY
EXTERNAL
SYSTEM SETUP
HVAC FAN ON
VENT-TIMED
VENT-AUTO
PRIMARY
HVAC FAN OFF
ON
1234
MODEL
76
DAMPERS
Rf DH -WGhGs
Cf
VENT
HVAC EQUIP REMOTE
DE
HB
+A
DEHUMIDIFIER
CONTROL BOARD
SENSOR
ODT
FLOAT
SWITCH
R/+
B
C/
-
A
DH
DH
CRAWL SPACE
DEHUMIDIFIER
90-1537
90-1618-13
SEQUENCE OF OPERATION
•OnceduringeveryCyclePeriod(setonthedipswitchesinthedehumidifier)thedehumidifierbloweranddehumidifierdamperoutputwill
turn on and sample the air in the area served by the dehumidifier. Sampling will also occur whenever the dryness level setting is raised at the
Model 76 Control. The green Status LED on the dehumidifier will flash during sampling.
•Afterthreeminutes,thedewpointoftheairismeasuredandcomparedtothedrynesslevelsetontheModel76Control.Ifthedewpointof
the air is above the setting, the compressor turns on and ON will flash on the Model 76 Control.
•Thedewpointoftheairiscontinuouslymonitoredduringcompressoroperation.Whenthedewpointoftheairfallsbelowthesetting,the
dehumidifier compressor and blower will turn off and ON will stop flashing on the Model 76 Control.
FIGURE 29 – Model 76 Remote Control Wiring
FIGURE 28 – Crawl Space Installation
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