Aprilaire 1700 Safety And Installation Instructions Manual page 11

VENTILATION / FAN CYCLING SETTINGS
This installed option allows outside air to be combined with
the fan cycling feature from the dehumidifier, provided the
outside air temperature is in the acceptable range (0-100°F).
Note: The dehumidifier can control the HVAC fan to provide
fan cycling, regardless of whether or not an outdoor
ventilation duct is installed.
• An Aprilaire ® Normally-Closed Damper (Model 6506) should
be installed in the outside air intake. It should be wired to the
terminals labeled "VENT DAMPER" on the dehumidifier
control board. Follow all installation instructions supplied
with the damper. Refer to each installation for ducting.
• The Outdoor Temperature Sensor (Model 4278) should be
installed outside in a shaded location (Figure 16) or in an
outside air intake duct, but no more than 3 feet from the
outside (Figure 17).
• The Outdoor Temperature Sensor is not affected by wire
length. However, do not route the wire alongside wires
carrying high voltage (115 VAC or greater), as interference
may occur.
• Connect the wires from the sensor to the terminals labeled "ODT SENSOR" on the dehumidifier.
See Figure 12 for terminal locations.
VENTILATION GUIDELINES
TABLE 1 – Air Cycling Time Setting (min./hr.)
House Size
(square feet)
1000-1500
1501-2000
2001-2500
2501-3000
3001-3500
As an example, for a 2,500 square foot home with 3 bedrooms, set the cycle time to 30 minutes of ventilation per one-hour cycle.
A longer outdoor air intake duct or lower return static pressure will increase the ventilation time required. Additionally, local
codes may affect the setting.
Bedrooms
2 3
20 25
25 30
25 30
30 35
30 35
(CONTINUED)
FIGURE 16
OUTDOOR
TEMPERATURE SENSOR
LEADS
1. Based on ASHRAE 62.2 ventilation
2. Based on outside air duct of 6"
4 5
30 35
3. Based on 'Cycle Period' being in
30 35
35 40
4. A longer outside air duct and/or
40 40
40 45
NORTH, EAST
OR WEST SIDE
OF HOME
ABOVE EXPECTED
SNOW LINE
36" MAX.
OUTSIDE WALL
requirement.
dia., 20' long flex duct, 0.15" w.c.
static pressure at outdoor air duct.
the default (1 hour) position.
lower static pressure will require a
longer Ventilation Time.
OUTDOOR
TEMPERATURE
SENSOR
SENSOR
SENSOR
BRACKET
B2202617-D
FIGURE 17
CENTER LINE
B2202617-E
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