Return Air Temperature Sensor (Optional); Leaving Air Temperature Sensor (Optional) - Aprilaire 8910 Safety & Installation Instructions

INSTALLATION

RETURN AIR TEMPERATURE SENSOR (OPTIONAL)

Return air temperature can be measured by attaching an 8052 sensor to the RAT terminals . The return sensor must
be enabled in the installer set-up menu . The return air temperature sensor provides protection in the event that the
equipment control module loses connection with the thermostat . In the event that the thermostat connection is lost,
the equipment control module will use the return air temperature sensor to maintain a temperature greater than 40°F
and less than 100°F .
1 . Locate the Aprilaire Model 8052 sensor
in the return trunk .
2 . Mount the sensor according to the
installation instructions provided with
the sensor .
3 . Wire the sensor to the equipment
control module RAT terminals .

LEAVING AIR TEMPERATURE SENSOR (OPTIONAL)

Leaving air temperature can be measured by attaching an 8052 sensor to the LAT terminals . The leaving air
temperature sensor measurement is displayed during the installer test for diagnostic purposes .
IMPORTANT
Do not mount the sensor in direct line-of-sight of the heat exchanger, cooling coils, or UV lights as this may cause
the sensor to report false temperature readings .
1 . Locate the Aprilaire Model 8052 sensor in the supply trunk, after the heat exchanger and cooling coils . (See
shaded areas in figure below .)
2 . Mount the sensor according to the installation instructions provided with the sensor .
3 . Wire the sensor to the equipment control module LAT terminals .
LOCATE
SENSOR
IN SHADED
AREA .
6
HVAC WIRING DIAGRAMS
CONVENTIONAL HEAT/COOL SINGLE TRANSFORMER (USE JUMPER)
1
THERMOSTAT
2
3
CONVENTIONAL HEAT/COOL TWO TRANSFORMER (REMOVE JUMPER)
1
THERMOSTAT
2
3
1 R and C can be
powered from the
HVAC equipment
transformer or any
other constantly
powered 24VAC
source.
C
TRANSFORMER
R
RC
RH
HC HP
W W 1 HEATING
st
W2 W2 2 HEATING
nd
W3 B 3 HEATING
rd
Y Y 1 COMPRESSOR
st
Y2 Y2 2 COMPRESSOR
nd
Y3 O
3 COMPRESSOR
nd
G G FAN
L
C
EQ
1
TRANSFORMER
C
R
COOLING TRANSFORMER
RC
RH
HEATING TRANSFORMER
HC HP
W W 1 HEATING
st
W2 W2 2 HEATING
nd
W3 B
Y Y
1 COMPRESSOR
st
Y2 Y2
2 COMPRESSOR
nd
Y3 O
3 COMPRESSOR
rd
G G FAN
L
C
EQ
7