Aprilaire 1750A Installation Instructions Manual page 9

SPOT INSTAllATION
DUCTING & WIRING
fIGURE 14 – Spot Ducted Installation
RETURN DUCT
SUPPLY DUCT
HVAC FURNACE
EQUIPMENT ROOM
CONDENSATE HOSE
(TO COMMON DRAIN
OR OUTSIDE)
DIP SWITCH CONfIGURATION
• C YCLE PERIOD: This determines how frequently the dehumidifier will sample
the air to check the humidity level . Set to 1 hour and adjust as needed .
• F or Ventilation switch settings, see VENTILATION section beginning on page 12.
• F or Local/External switch setting, see THIRD-PARTY CONTROL on page 17.
SEQUENCE Of OPERATION
• S ampling will occur at the end of 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 .
• A fter 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 next
sampling will occur at the end of the next Cycle Period .
• T he 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 .
(CONTINUED)
OUTSIDE AIR TO HOUSE
DEHUMIDIFIED AIR
IS SUPPLIED
TO DUCTED SPACE
LIVING SPACE
115 VAC
CIRCUIT
GRILLE WITH
8" DUCT COLLAR
DEHUMIDIFIER
FLOOR DRAIN
Wiring Notes:
• N o additional wiring required.
• I f wiring to a Model 70 Living Space Control, see
MODEL 70 LIVING SPACE CONTROL section on
page 16 .
• I f wiring to a third-party control, see THIRD-PARTY
CONTROL section on page 17 .
AIR IS PULLED
FROM AREA
90-1536
fIGURE 15 – Spot DIP Switch Settings
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
90-1538
SYSTEM SETUP
LOCAL EXTERNAL
HVAC FAN ON
CONVERTIBLE
VENT-TIMED
CYCLE PERIOD
30 MIN.
1 HOUR
2 HOUR
3 HOUR
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