Aprilaire 8920W Installation Manual
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Safety &
Installation
Instructions
TABLE OF CONTENTS
Model 8920W
Wi-Fi IAQ Thermostat
INSTALLATION
Thermostat installation location recommendations ...2
Thermostat mounting...........................2
Equipment control module installation location
recommendations..............................2
Equipment control module mounting ..............2
Thermostat wiring .............................3
Remote temperature sensor (optional) .............3
Equipment control module wiring .................4
Outdoor temperature sensor (included).............5
Optional wireless outdoor temperature sensor ......5
Return air temperature sensor (optional) ...........6
Leaving air temperature sensor (optional) ..........6
HVAC WIRING DIAGRAMS
Conventional heat/cool single transformer..........7
Conventional heat/cool two transformer ...........7
Heat pump single transformer....................8
Heat pump two transformer .....................8
INDOOR AIR QUALITY WIRING DIAGRAMS
Indoor Air Quality wiring with separate transformers ...9
Indoor Air Quality wiring with a single transformer.....9
POWER & RESET OPTIONS
Power and reset options .......................10
SETUP & TESTING
Installer setup wizard .........................10
HVAC installer system settings tables .........10-12
General system settings table .................10
Thermostat system settings table ...........11-12
Indoor Air Quality system settings tables.......13-15
Humidifier system settings table ...............13
Dehumidifier system settings table .............14
Air cleaning system settings table..............14
Fresh air system settings table ................15
Installer system test ..........................16
Wi-Fi setup..................................16
REFERENCES
Quick reference to controls & display..........17-18
Thermostat features ..........................18
Troubleshooting ..............................19
Specifications................................20
INSTALLATION
INSTALLATION
THERMOSTAT INSTALLATION LOCATION RECOMMENDATIONS
Thermostat should be mounted:
• On an interior wall, in a frequently
occupied space.
• Approximately 5‘ above floor.
• At least 18” from outside wall.
• Thermostat can be mounted to a
vertical junction box.
Do not mount thermostat:
• Behind doors, in corners or other dead air spaces.
• In direct sunlight, near lighting fixtures, or other appliances that
give off heat.
• On an outside or unconditioned area wall.
• In the flow of a supply register, in stairwells, or near outside doors.
• On a wall with concealed pipes or ductwork.
THERMOSTAT MOUNTING
1. Remove the rear mounting plate from the thermostat.
2. Pull wires through the opening on the rear mounting plate.
3. Position and level the mounting plate of the thermostat on wall and
mark the hole locations with a pencil.
4. Drill 1/4” holes and insert supplied anchors (drywall only).
5. Place mounting plate over anchors, insert and tighten screws.
6. Seal wire entry holes to prevent drafts affecting temperature readings.
90-2122
EQUIPMENT CONTROL MODULE INSTALLATION LOCATION RECOMMENDATIONS
Note: Installer must touch a grounded metal object before handling the equipment control module to avoid potential
damage due to electrical discharge.
Equipment control module should be mounted:
• In a location where the temperature will not exceed
158°F (70°C) or drop below 32°F (0°C).
Do not mount equipment control module:
• On foundation walls or on the HVAC equipment or
ductwork. These locations can cause moisture to
condense on the equipment control module.
EQUIPMENT CONTROL MODULE MOUNTING
The equipment control module has the following features to simplify mounting and wiring and provide for a clean
and neat installation.
• Six (6) mounting holes. One on each corner and two centered top and bottom. Any combination of these holes
may be utilized. Mount the equipment control module using 2 to 4 #8 screws appropriate for the mounting surface
substrate. (See Figure 2.)
• Wires can be routed through
the top, bottom, sides or back.
• Nylon wire ties can be used
to secure wires in 10 places.
Installation Steps
1. Select mounting location.
2. Pull from bottom to remove
front cover. (See Figure 1.)
3. Mount base using 2 to 4 #8
screws (field supplied).
Figure 1 Figure 2
THERMOSTAT WIRING
Wire specifications:
18-24 gauge thermostat wire
Installation notes:
• Ensure power at the HVAC equipment is off.
• Loosen screw terminals, insert stripped wire
and re-tighten.
90-2123
• Push the excess wire back into the opening and plug the wall opening to prevent drafts.
1 – Connection to terminal 1 at equipment control module
2 – Connection to terminal 2 at equipment control module
3 – Connection to terminal 3 at equipment control module
T1 & T2 – Remote temperature sensor (optional)
REMOTE TEMPERATURE SENSOR (OPTIONAL)
A remote temperature sensor can be used for control if the thermostat is to be mounted in a concealed location
or a remote sensor can be averaged with the thermostat sensor to control a large space. An 8051 flush mount
or 8053 surface mount remote temperature sensor can be attached to the T1 and T2 terminals and mounted in a
recommended area. The remote sensor must be enabled in the installer setup menu, and once enabled will override
or be averaged with the thermostat’s internal temperature sensor, based on the setting.
Remote temperature sensor should
be mounted:
• On an interior wall, in a frequently
occupied space.
• Approximately 5‘ above floor.
• At least 18” from outside wall.
• Using less than 300’ of wire.
Do not mount remote sensor:
• Behind doors, in corners or other dead
air spaces.
• In direct sunlight, near lighting fixtures,
or other appliances that give off heat.
• On an outside or unconditioned area wall.
• In the flow of a supply register, in stairwells,
or near outside doors.
• On a wall with concealed pipes or ductwork.
• Near 120 VAC lines.
90-2124
2 3
INSTALLATION INSTALLATION
EQUIPMENT CONTROL MODULE WIRING
OUTDOOR TEMPERATURE SENSOR (INCLUDED)
Outdoor temperature can be measured by installing an 8052 sensor to the ODT terminals and enabling the outdoor
sensor in the installer setup menu. When an outdoor sensor is installed, the features below will be enabled.
In heat pump mode the outdoor temperature sensor can be used to efficiently utilize an air source heat pump:
• When the outdoor temperature is less than the Low Balance Point, the heat pump will be locked out and only
auxiliary heating will be used to provide heating.
• When the outdoor temperature is higher than the High Balance Point, the auxiliary heating will be locked out and
only the heat pump will be used to provide heating.
Indoor Air Quality functions can use the outdoor temperature sensor to:
• Control humidification setpoint based on outdoor temperature to prevent condensation
• Lock out humidification for temperatures over 60°F or below -30°F.
• Lock out ventilation based on high and/or low outdoor temperatures.
• Display outdoor temperature on thermostat.
Outdoor temperature sensor should
be mounted:
• On side of building out of direct sunlight
(north side recommended).
• Above snow line.
• At least 3’ away from exhaust vents and
condensing lines.
• Using less than 300’ of wire.
Wire specifications:
18-24 gauge thermostat wire
Installation notes:
• Ensure power at the HVAC equipment is off.
• Loosen screw terminals, insert stripped wire
and re-tighten.
• Use zip tie to route wiring through the wiring
channels.
1 – Connection to terminal 1 at thermostat
2 – Connection to terminal 2 at thermostat
3 – Connection to terminal 3 at thermostat
RAT – Return air temperature sensor (optional)
LAT – Leaving air temperature sensor (optional)
ODT – Outdoor temperature sensor (included)
C – 24VAC common
R – 24VAC
RC – 24VAC cooling
RH – 24VAC heating
W – First stage heat (conventional)/auxiliary (heat pump)
W2 – Second stage heat (conventional)/ auxiliary (heat
pump)
W3/B – Third stage heat (conventional)/reversing valve
(heat pump)
Y – First stage cooling (conventional)/first stage compressor
(heat pump)
Y2 – Second stage cooling (conventional)/second stage
compressor (heat pump).
Y3/0 – Third stage cooling (conventional)/reversing valve
(heat pump)
G – Fan
• Do not route wires along 120 VAC lines.
OPTIONAL WIRELESS OUTDOOR TEMPERATURE SENSOR
For installations where it is difficult to wire the included 8052 outdoor temperature sensor, a Model 8056 wireless
outdoor temperature module can be used. The Model 8056 module has two radio units, one that is placed on the
equipment control module as shown below, and a second radio that is placed outside. See the Model 8056 Installation
Instructions for detailed directions regarding installation.
Outdoor Sensor
L – System fault indicator (heat pump only) (optional)
C
EQ – 24VAC common from heat pump for system fault
indicator (optional)
HUM – Humidifier
DHno & DHcom – Normally open dehumidifier control
DHnc & DHcom – Normally closed dehumidifier control
VENT – Ventilation
EAC – Electronic Air Cleaner
4 5
INSTALLATION HVAC WIRING DIAGRAMS
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 setup 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.
CONVENTIONAL HEAT/COOL SINGLE TRANSFORMER (USE JUMPER)
C
THERMOSTAT
1
2
3
RC
RH
HC HP
W
W2
W2
W3
Y
Y2
Y3
G
C
R
W
B
Y
Y2
O
G
L
EQ
CONVENTIONAL HEAT/COOL TWO TRANSFORMER (REMOVE JUMPER)
TRANSFORMER
HEATING TRANSFORMER
THERMOSTAT
1
R and C can be
powered from the
HVAC equipment
transformer or any
other constantly
powered 24VAC
source.
C
W2
W3
R
RC
RH
HPHC
W
W
W2
B
Y
Y
Y2
Y2
O
Y3
G
G
L
EQ
C
1
2
3
TRANSFORMER
1st HEATING
2nd HEATING
3rd HEATING
1
st COOLING
2nd COOLING
3nd COOLING
1
HEATING
st
2nd HEATING
3rd HEATING
1st COOLING
2nd COOLING
3rd COOLING
FAN
FAN
1
COOLING TRANSFORMER
6 7
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