Aprilaire 1750A Installation Instructions Manual page 14

VENTIlATION OR AIR CyClING
SETTING DIP SWITCHES & CyClE TIME TO MEET VENTIlATION REQUIREMENTS
fIGURE 21 – VENT-TIMED DIP Switch Settings
SYSTEM SETUP
LOCAL
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
CYCLE PERIOD
0
MIN
OFF
CYCLE TIME
Switch Notes:
• S etting the Cycle Time ≥ Cycle Period will result in constant ventilation .
• S etting the Cycle Time to OFF will disable ventilation.
1 . Set VENT-AUTO and VENT-TIMED switch . VENT-AUTO restricts ventilation based on outdoor temperature (incoming air conditions) and
VENT-TIMED allows ventilation regardless of outdoor air conditions . The VENT-AUTO configuration requires the installation of the Model 8052
outdoor temperature sensor (ODT) .
2 . Set the Cycle Period by moving the 1/2, 1, 2, or 3 hour switch to the ON position . The Cycle Period is the time over which a ventilation cycle
will occur . The default position is 1 hour .
3 . Set the Cycle Time, determined in Table 5, by rotating the potentiometer between 0 minutes and 60 minutes . The Cycle Time determines how long
during each Cycle Period ventilation will occur . Once the ventilation time requirement is met, ventilation will not occur until the next cycle period .
OUTDOOR TEMPERATURE SENSOR INSTAllATION
The ODT should be installed outside in a shaded location (see figure 23), or in the outside intake ventilation duct (see figure 24) .
fIGURE 23 – ODT Mounted Outside
NORTH, EAST
OR WEST SIDE
OF HOME
OUTDOOR
TEMPERATURE SENSOR
LEADS
14
(CONTINUED)
EXTERNAL
HVAC FAN ON
CONVERTIBLE
VENT-TIMED
30 MIN.
1 HOUR
2 HOUR
3 HOUR
30
MIN.
60
MIN.
TEST
OUTDOOR
TEMPERATURE
SENSOR
SENSOR
SENSOR
BRACKET
ABOVE EXPECTED
SNOW LINE
fIGURE 22 – VENT-AUTO DIP Switch Settings
HVAC FAN OFF
90-1538
fIGURE 24 – ODT Mounted in Intake Duct
B2202617-D
SYSTEM SETUP
LOCAL
EXTERNAL
HVAC FAN ON
WHL HOUSE CONVERTIBLE
VENT-AUTO VENT-TIMED
CYCLE PERIOD
30 MIN.
1 HOUR
2 HOUR
3 HOUR
30
MIN.
0 60
MIN MIN.
OFF TEST
CYCLE TIME
36" MAX.
OUTSIDE WALL
90-1538
CENTER LINE
B2202617-E