Aprilaire 8840 Installation Manual

Model 8840 Touch Screen Wi‑Fi Automation Thermostat with Integrated Indoor Air Quality Solutions

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Safety & Installation Instructions

TABLE OF CONTENTS

INSTALLATION

Thermostat installation location recommendations ...2

Thermostat mounting...........................2

Equipment control module installation location

recommendations..............................2

Equipment control module mounting ..............3

Thermostat wiring .............................3

Remote temperature sensor (optional) .............4

Support module wiring (optional) .................4

Equipment control module wiring .................5

Outdoor temperature sensor (included).............6

Optional wireless outdoor temperature

and humidity sensor ...........................6

Return air temperature sensor (optional) ...........7

Leaving air temperature sensor (optional) ..........7

HVAC WIRING DIAGRAMS

Conventional heat/cool single transformer..........8

Conventional heat/cool two transformer ...........8

Heat pump single transformer....................9

Heat pump two transformer .....................9

B2207185B 9.18

INDOOR AIR QUALITY WIRING DIAGRAMS

Indoor Air Quality wiring with separate transformers ..10

Indoor Air Quality wiring with a single transformer....10

POWER & RESET OPTIONS

Power and reset options .......................11

SETUP & TESTING

Installer setup wizard .........................11

HVAC installer system settings tables .........11-13

General system settings table .................11

Thermostat system settings table ...........12-13

Indoor Air Quality system settings tables.......14-17

Humidifier system settings table .............14-15

Dehumidifier system settings table .............15

Air cleaning system settings table..............16

Fresh air system settings table .............16-17

Installer system test ..........................17

WiFi setup ..................................17

REFERENCES

Quick reference to controls & display..........18-19

Thermostat features ..........................20

Troubleshooting ..............................21

Specifications................................22

English 1

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.

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.

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.

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.

90-2122

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).

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.

• 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

A & B – Model 8081 or Model 8082 support module communication (optional)

T1 & T2 – Remote temperature sensor (optional)

Figure 1 Figure 2

90-2168

English 32 English

INSTALLATION

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

SUPPORT MODULE WIRING (OPTIONAL)

Up to 4 support modules can be wired for remote sensing of temperature and/or humidity. Each sensor can be configured for control or monitoring.

Note: Support modules should be wired with CAT-5 wire. The total length of wire for all support modules should not exceed 1000 feet.

MODEL 8081 OR 8082

MODEL 8083 SUPPORT MODULE

SUPPORT MODULE

RSARSB

T2T1

90-2169 90-2282

8083 Module Red Black Yellow Green

8840 Thermostat

1 2 A B

EQUIPMENT CONTROL MODULE 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.

• 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

L – System fault indicator (heat pump only) (optional)

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

English 54 English

INSTALLATION

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.

• Do not route wires along 120 VAC lines.

OPTIONAL WIRELESS OUTDOOR TEMPERATURE AND HUMIDITY SENSOR

For installations where it is difficult to wire the included 8052 outdoor temperature sensor, a Model 8056 wireless outdoor sensor 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.

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.

Outdoor Sensor

LOCATE SENSOR IN SHADED AREA.

English 76 English

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