Aprilaire S86N MU Multi Stage Universal Thermostat Instruction Manual

: June 14, 2024
: Aprilaire

Table of Contents

Aprilaire S86N MU Multi Stage Universal Thermostat
Product Information
INSTALLATION
- THERMOSTAT MOUNTING
WIRING DIAGRAMS
SETUP AND TESTING
- SYSTEM TEST MENU
QUICK REFERENCE TO CONTROLS & DISPLAY
TROUBLESHOOTING
THERMOSTAT FEATURES
SPECIFICATIONS
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Aprilaire S86N MU Multi Stage Universal Thermostat

Aprilaire-S86N-MU-Multi-Stage-Universal-Thermostat-
product

Product Information

Specifications

Model: S86N MU
Type: Multi-Stage Universal Thermostat
Model: S86N MUPR
Type: Multi-Stage Universal Thermostat with IAQ

Installation

Installation Location Recommendations
It is recommended to install the thermostat in a suitable location. Please refer to the installation manual for detailed instructions.

Outdoor Temperature Sensor (included with S86N MUPR only)
The thermostat comes with an outdoor temperature sensor (8052) that can be attached to the T1 and T2 terminals. To enable the outdoor sensor, navigate to the installer setup menu.

Remote Temperature Sensor (optional)
A remote temperature sensor can be installed if desired. Please refer to the installation manual for instructions on how to connect and configure the remote temperature sensor.

Thermostat Mounting

Remove the rear mounting plate from the thermostat.
Pull the wires through the opening on the back of the rear mounting plate.
Position and level the mounting plate on the wall and mark the hole locations with a pencil.
Insert and tighten the supplied self-drilling anchors (for drywall only).
Place the mounting plate over the anchors and insert and tighten the screws.
Seal wire entry holes to prevent drafts from affecting temperature readings.

Power and Reset Options
The thermostat is powered by 24VAC. In case of power loss, the thermostat will maintain the clock for 2 hours. It also has a memory backup that saves the thermostat settings in case of power interruption. The thermostat can be set back to factory defaults from the installer settings menu.

Wiring Terminal
The thermostat has the following wiring terminals:

RH: 24VAC supply for heating
RC: 24VAC supply for cooling
W: First stage heat (conventional) / First stage auxiliary (heat pump)
Y: First stage cooling (conventional) / First stage compressor (heat pump)
G: Fan
C: Common
O/B: Reversing valve
L: System fault indicator (optional, heat pump only)
W2: Second stage heat (conventional) / Second stage auxiliary (heat pump)
Y2: Second stage cooling (conventional) / Second stage compressor (heat pump)
T1 & T2: Outdoor/remote temperature sensor
I1 & I2: Indoor Air Quality control output (S86N MUPR only)

FAQs

Q: What is included with the S86N MUPR model?
A: The S86N MUPR model includes an outdoor temperature sensor (8052).
Q: Can I install a remote temperature sensor?
A: Yes, a remote temperature sensor can be installed. Please refer to the installation manual for instructions.
Q: How long does the thermostat maintain the clock in case of power loss?
A: The thermostat will maintain the clock for 2 hours in case of power loss.
Q: How can I reset the thermostat to factory defaults?
A: The thermostat can be set back to factory defaults from the installer settings menu. Please refer to the installation manual for detailed instructions.

SAFETY & INSTALLATION INSTRUCTIONS

Model S86N MU
Multi-Stage Universal Thermostat
Model S86N MUPR
Multi-Stage Universal Thermostat with IAQ

INSTALLATION

INSTALLATION LOCATION RECOMMENDATIONS

Thermostat should be mounted:

On an interior wall, in a frequently occupied space.
Approximately 5 feet 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.

OUTDOOR TEMPERATURE SENSOR (INCLUDED WITH S86N MUPR ONLY)
Outdoor temperature can be measured by attaching the included 8052 sensor to the T1 and T2 terminals. The outdoor sensor must be enabled in the installer setup menu.

Heat pump models can use the outdoor temperature to effectively utilize the heat pump:

When the outdoor temperature is lower 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 set point based on outdoor temperature to prevent condensation (S86N MUPR only).
Lock out ventilation based on high and/or low outdoor temperatures (S86N MUPR only).
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 feet away from exhaust vents and condensing lines.
Using less than 300 feet of wire.
Do not route wires along 120 VAC lines.

$Aprilaire-S86N-MU-Multi-Stage-Universal-Thermostat-fig- $1$$

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 set-up 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 feet above floor.
At least 18” from outside wall.
Using less than 300 feet 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.

$Aprilaire-S86N-MU-Multi-Stage-Universal-Thermostat-fig- $2$$

THERMOSTAT MOUNTING

Remove the rear mounting plate from the thermostat.
Pull wires through the opening on the back of the rear mounting plate.
Position and level the mounting plate of the thermostat on wall and mark the hole locations with a pencil.
Insert and tighten supplied self-drilling anchors (drywall only).
Place mounting plate over anchors, insert and tighten screws.
Seal wire entry holes to prevent drafts affecting temperature readings.

POWER AND RESET OPTIONS
The thermostat is powered from 24VAC. In the case of power loss, the thermostat will maintain the clock for 2 hours. The thermostat has a memory backup that saves the thermostat settings in case of power interruption. The thermostat can be set back to factory defaults from the installer settings menu. See Installer System Settings section for details.

WIRING TERMINAL

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.

RH	24VAC supply heating*
RC	24VAC supply cooling*
W	First stage heat (conventional) / First stage auxiliary (heat pump)
Y	First stage cooling (conventional) / First stage compressor (heat

Y2

| Second stage cooling (conventional)

/ Second stage compressor (heat pump)

T1 & T2| Outdoor/remote temperature sensor
I1 & I2| Indoor Air Quality control output (S86N MUPR only)

Jumper between RC & RH is used in single transformer systems (see wiring diagrams).

WIRING DIAGRAMS

FIGURE 5 – SINGLE & MULTI STAGE HEAT/COOL, ONE TRANSFORMER

NOTE:
Dashed lines represent wiring for multi stage systems only.

FIGURE 6
SINGLE & MULTI STAGE HEAT/COOL, (EX: BOILER) TWO TRANSFORMER

NOTE:
Dashed lines represent wiring for multi stage systems only.

FIGURE 7
SINGLE & MULTI STAGE HEAT PUMP, ONE TRANSFORMER

NOTE:
Dashed lines represent wiring for multi stage systems only.

FIGURE 8
RADIANT & HEAT/COOL, ONE TRANSFORMER

FIGURE 9
RADIANT & HEAT PUMP, ONE TRANSFORMER

FIGURE 10
INDOOR AIR QUALITY EQUIPMENT WIRING DIAGRAMS (S86N MUPR ONLY)

$Aprilaire-S86N-MU-Multi-Stage-Universal-Thermostat-fig- $10$$

NOTE:
The I1/I2 output is a dry contact closure. The HUMIDIFIER wiring diagram assumes the control is powering a solenoid valve. The DEHUMIDIFIER wiring diagram is for a normally open dry contact input. The VENTILATION wiring diagram assumes the control is for a normally closed damper. Refer to the individual humidifier, dehumidifier or ventilation installation instructions for product specific wiring details.

SETUP AND TESTING

INSTALLER SETUP WIZARD AND INSTALLER SETTING
The first time the thermostat is powered up (or after a factory reset) it will enter the Installer Setup Wizard. All Installer Settings can be set through this process. The Installer Settings are also accessible in the Installer Menu.

HOW TO ENTER THE INSTALLER MENU:

Press Select to enter the Main Menu.
Use or to navigate to Settings, press SELECT.
Press and hold and for 3 seconds to unlock the Installer option.
Use or to navigate to Installer, press SELECT. Refer to the chart at right for options.

INSTALLER MENU OPTIONS|

DESCRIPTION

---|---

HVAC Settings

| Essential HVAC equipment (equipment type, stages, etc.)

HVAC Advanced

| Advanced HVAC control (effsets, deadbands, staging, protection, etc.)
IAQ Settings (S86N MUPR

only)

| Humidifier, Dehumidifier, Air Cleaner, and Ventilation configuration

Test

| Installer test for configured equipment relay outputs
Reset| Reset all settings to factory default

HVAC INSTALLER SYSTEM SETTINGS TABLE
The following table contains the system settings and their details. Default settings are shown in bold. The availability of some settings is dependent upon the value of other settings.

TABLE 1 – HVAC INSTALLER SYSTEM SETTINGS

System setting

|

Description

| Factory default setting (bold) and setting range
Equipment Type| NOTE: Equipment Type related settings will return to defaults if this is changed.| Heat/Cool

Heat Pump

O/B Energized For?| Selects O or B reversing valve operation. (Heat Pump mode only.)| Cooling

Heating

Control Setup

| Used to lockout heating or cooling outputs. (Heat/Cool mode only).| Heat & Cool Heat Only Cool Only
Heat Pump Auxiliary Type| Selects auxiliary type. (Heat Pump mode only.)| Gas/Oil Heat

Electric Heat

Fan Control in Heating| Selects thermostat or equipment to control the fan in heating. (Heat/Cool mode only.)| Gas/Oil Heat

Electric Heat

TABLE 1 – HVAC INSTALLER SYSTEM SETTINGS

System setting

|

Description

| Factory default setting (bold) and setting range
Number of Compressor Stages| Select number of compressor stages. (Heat Pump mode only.)| One

Two

Number of Auxiliary Heat Stages| Select number of auxiliary heat stages. (Heat Pump mode only.)| One

Two

Number of Stages of Heat| Select number of heat stages. (Heat/ Cool mode only.)| One

Two

Number of Stages of Cool| Select number of cool stages. (Heat/Cool mode only.)| One

Two

Programmable| Non Programmable hides all scheduling features.| Programmable

Non Programmable

| | Outdoor

Wired Temperature Sensor Installed?

| Selects how the external temperature sensor terminals (T1 & T2) are being used. Choose Outdoor for a wired outdoor sensor or Remote/Remote Average for a wired indoor sensor.| Remote

(Onboard sensor disabled)

Remote Average

(Average with onboard sensor)

No

(No external sensor connected)

TABLE 1 – HVAC INSTALLER SYSTEM SETTINGS

System setting

|

Description

| Factory default setting (bold) and setting range
Advanced HVAC Settings?| Select No to skip the rest of the thermostat settings.| No

Yes

Progressive Recovery| Enables or disables progressive recovery.| Disabled

Enabled

Display Heat Blast?| Select if the Heat Blast option is displayed.| No

Yes

Heat Blast Offset

| Amount of heating when Heat Blast is initiated.| 3°F (1.5°C)

4°F (2°C)

5°F (2.5°C)

Extended Fan – Heat| Extends fan operation 90 seconds after heat call ends.| Disabled

Enabled

Extended Fan – Cool| Extends fan operation 90 seconds after cool call ends.| Disabled

Enabled

Auto Changeover| Enable or disable Auto Changeover mode.| Disabled

Enabled

TABLE 1 – HVAC INSTALLER SYSTEM SETTINGS

System setting

|

Description

| Factory default setting (bold) and setting range
DeadBand| Auto Changeover mode deadband.| 3°F (1.5°C)

2 to 9°F (1 to 4.5°C)

Auto Changeover Time| Minimum time between heating and cooling calls.| 4 Minutes

1 to 5 Minutes

Temp Sensor Offset| Field adjustment of controlling temperature sensors.| 0°F (0°C)

-4 to 4°F (-2 to +2°C)

RH Sensor Offset| Internal RH sensor. Increases or decreases displayed RH%.| 0

-5 to 5

Equipment Minimum On Time| Minimum on time for heating and cooling.| 2 Minutes

1 to 5 Minutes

Heating Minimum Off Time| Minimum off time for heating.| 2 Minutes

1 to 5 Minutes

Compressor Minimum Off Time| Minimum off time for compressor protection.| 5 Minutes

1 to 5 Minutes

TABLE 1 – HVAC INSTALLER SYSTEM SETTINGS

System setting

|

Description

| Factory default setting (bold) and setting range
Outdoor Temperature High Balance Point| Enable or disable high balance point. (Available if an ODT is installed.)| Enabled

Disabled

High Balance Point Temperature

| If outside temperature is above the high balance point the aux heat operation is not allowed. (Available if high balance point is enabled.)|

65°F (14.5°C)

0 to 80°F (-18 to 22°C)

Outdoor Temperature Low Balance Point| Enable or disable low balance point. (Available if an ODT is installed.)| Enabled

Disabled

Low Balance Point Temperature

| If outside temperature is below the low balance point the compressor operation is not allowed. (Available if low balance point is enabled.)|

20°F (-8°C)

0 to 60°F (-18 to 12°C)

Stage Rate| Accumulation of difference from setpoint over time in staging determination.| Enabled

Disabled

TABLE 1 – HVAC INSTALLER SYSTEM SETTINGS

System setting

|

Description

| Factory default setting (bold) and setting range

Stage Rate Factor

| 1 = more rapid staging of equipment (comfort),

5 = slower staging of equipment (economy).

|

2

1 to 5

First Stage Differential| First stage differential.| 1°F (0.5°C)

1 to 9°F (0.5 to 4.5°C)

Second Stage Differential| Second stage differential.| 1°F (0.5°C)

1 to 9°F (0.5 to 4.5°C)

Third Stage Differential| Third stage differential.| 1°F (0.5°C)

1 to 9°F (0.5 to 4.5°C)

Fourth Stage Differential| Fourth stage differential.| 1°F (0.5°C)

1 to 9°F (0.5 to 4.5°C)

Service HVAC Reminder| Enable or disable the HVAC Service reminder message.| Disabled

Enabled

Recurrence| Select number of months between HVAC Service reminder messages.| 12 Months

1 to 12 Months

TABLE 1 – HVAC INSTALLER SYSTEM SETTINGS

System setting

|

Description

| Factory default setting (bold) and setting range
Max Heat Setting| Select the maximum heating set point temperature allowed.| 90°F (32°C)

40 to 90°F (4.5 to 32°C)

Min Heat Setting| Select the minimum heating set point temperature allowed.| 40°F (4.5°C)

40* to 90°F (4.5 to 32°C)

Max Cool Setting| Select the maximum cooling set point temperature allowed.| 99°F (37°C)

50 to 99°F (10 to 37°C)

Min Cool Setting| Select the minimum cooling set point temperature allowed.| 50° (10°C)

50 to 99°F (10 to 37°C)

INDOOR AIR QUALITY SYSTEM SETTINGS TABLES (S86N MUPR ONLY)
The following tables contain the Indoor Air Quality system settings and their details. Default settings are shown in bold. The availability of some settings is dependent upon the value of other settings. The use of outdoor temperature data enables additional Indoor Air quality functionality. While the outdoor temperature sensor option was presented in the HVAC installer settings, it is also available in the Indoor Air Quality settings.

Please refer to the Owner’s Manual for further information about thermostat features.

TABLE 2 – HUMIDIFIER SYSTEM SETTINGS (S86N MUPR ONLY)

System setting

|

Description

| Factory default setting (bold) and setting range
NOTE: A humidifier can only be installed if ventilation is not installed and dehumidifier control is not set to Whole Home.

Humidifier Installed?

| Selects whether a humidifier is installed. Yes/On HVAC is used for applications where the humidifier is installed on the HVAC duct. Yes/Standalone is used for applications where the humidifier is independent from the HVAC system. (If set to No , no other humidifier settings will be available.)|

No

Yes/On HVAC Yes/Standalone

TABLE 2 – HUMIDIFIER SYSTEM SETTINGS (S86N MUPR ONLY)

System setting

|

Description

| Factory default setting (bold) and setting range

Wired Temperature Sensor Installed?

|

Selects how the external temperature sensor terminals (T1 & T2) are being used. Choose Outdoor for a wired outdoor sensor or Remote/Remote Average for a wired indoor sensor.

| Outdoor Remote

(Onboard sensor disabled)

Remote Average

(Average with onboard sensor)

No

(No external sensor connected)

Humidifier Mode

| Selects auto or manual mode. Auto mode controls humidity based on the humidity setting and outdoor temperature. Manual mode controls humidity based on the %RH setpoint. (Auto mode is only available if an outdoor sensor option is enabled.)|

Auto

Manual

$Aprilaire-S86N-MU-Multi-Stage-Universal-Thermostat-fig- $17$$

TABLE 2 – HUMIDIFIER SYSTEM SETTINGS (S86N MUPR ONLY)

System setting

|

Description

| Factory default setting (bold) and setting range

Humidifier Reminder

|

Selects when the “Change Water Panel” message is displayed.

| Off

150h Valve 300h Valve 600h Valve

1 per season

2 per season

Single or First Reminder Appears

|

Determines the month the first (or only) “Change Water Panel” message is displayed.

| October **** April

November May

December June

January July

February August

March September

Second Reminder Appears

|

Determines the month the second “Change Water Panel” message is displayed. (Only available when 2 reminders per season is selected.)

| October April

November May

December June

January **** July

February August

March September

TABLE 3 – DEHUMIDIFIER SYSTEM SETTINGS (S86N MUPR ONLY)

System setting

|

Description

| Factory default setting (bold) and setting range
NOTE: Dehumidifier control can only be set to Whole Home if ventilation and humidification are not enabled.

Dehumidifier Type Installed?

| Selects if a dehumidifier is installed. (If set to None , no other dehumidifier settings will be available.) AC w/ IAQ selects overcooling, I1 and I2 terminals energize during overcooling. AC w/o IAQ selects overcooling, I1 and I2 terminals are not used.|

None

Whole Home AC w/ IAQ

AC w/o IAQ

Disable Dehumidification During Cooling?| Selects if dehumidification is disabled during a cooling call.| Yes

No

Dehumidifier Forces Fan?| Selects if dehumidification can turn on the HVAC system fan.| Yes

No

Dehumidifier Overcool Limit| Selects the amount of overcooling that can occur for dehumidification. (Only available if dehumidifier type is set to O v e r c oo l.)| 1°F (0.5°C)

2°F (1°C)

3°F (1.5°C)

TABLE 3 – DEHUMIDIFIER SYSTEM SETTINGS (S86N MUPR ONLY)

System setting

|

Description

| Factory default setting (bold) and setting range
Dehumidifier Reminder| Enable or disable the Dehumidifier Service reminder message.| Disabled

Enabled

Recurrence| Select number of months between Dehumidifier Service reminder messages.| 12 Months

1 to 12 Months

Dehumidify in Vacation Hold?| Selects if dehumidification with the air conditioner is done in vacation mode.| No

Yes

Vacation Hold Low Temperature Limit

| Sets the lowest temperature the air conditioner will cool to, to meet RH setpoint in Vacation Mode. (Only available if dehumidifier type is set to O v e r c oo l.)|

75°F (24°C)

70 to 85°F (21 to 29.5°C)

Humidity Deadband

| Select the minimum difference between the humidifier and dehumidifier setpoints. (Only available if both Humidifier and Dehumidifier are enabled.)|

10%

10 to 20%

TABLE 4 – AIR CLEANING SYSTEM SETTINGS (S86N MUPR ONLY)

System setting

|

Description

| Factory default setting (bold) and setting range
Air Cleaner Installed?| Selects if an air cleaner is installed. (If set to No , no other air cleaner settings will be available.)| No

Yes

Air Cleaner Reminder| Enable or disable the Change Air Filter message.| Disabled

Enabled

Recurrence| Select number of months between Change Air Filter messages.| 12 Months

1 to 12 Months

TABLE 5 – FRESH AIR VENTILATION SYSTEM SETTINGS (S86N MUPR ONLY)

System setting|

Description

| Factory default setting (bold) and setting range
NOTE: Ventilation can only be installed if humidification is not enabled and dehumidifier control is not set to Whole Home.
Fresh Air Vent Installed?| Selects if ventilation is installed. (If set to No , no other ventilation settings will be available.)| No

Yes

Fresh Air Setup Type

| Selects if ventilation is configured through the Code setup or Comfort. Comfort setup has more lockout options. Code setting ensures time missed due to lockouts is made up.|

Comfort

Code

Number of Bedrooms| Selects the number of bedrooms to be used for the Calculated Minutes per Hour.| 3 Bedrooms

1 to 10 Bedrooms

Square Footage| Selects the size of the home to be used for the Calculated Minutes per Hour.| 2500 SQ FT

500 to 7500 SQ FT

Measured CFM| Selects the ventilation CFM to be used for the Calculated Minutes per Hour.| 110 CFM

30 to 250 CFM

Calculated Minutes Per Hour|

Displays the Fresh Air Time calculated.

| None

Range 6 to 60 Minutes

TABLE 5 – FRESH AIR VENTILATION SYSTEM SETTINGS (S86N MUPR ONLY)

System setting|

Description

| Factory default setting (bold) and setting range
Override| Manual adjustment of Calculated Minutes per Hour.| (Calculated Minutes per Hour)

Range 6 to 60 Minutes

| | Outdoor
Wired Temperature Sensor Installed?| Selects how the external temperature sensor terminals (T1 & T2) are being used. Choose Outdoor for a wired outdoor sensor or Remote/ Remote Average for a wired indoor sensor.| Remote

(Onboard sensor disabled)

Remote Average

(Average with onboard sensor)

No

(No external sensor connected)

High Vent RH Limit| Selects if ventilation is disabled when the indoor RH exceeds the indoor RH limit. (Only available if Fresh Air Setup is set to C o m f o r t.)| Disabled

Enabled

High Vent RH Limit| Sets the ventilation indoor RH lockout limit. (Only available if High Vent RH Limit is set to E n a b le d.)| 55%

45% to 70%

Low Vent RH Limit| Selects if ventilation is disabled when the indoor RH exceeds the indoor RH limit. (Only available if Fresh Air Setup is set to C o m f o r t.)| Disabled

Enabled

TABLE 5 – FRESH AIR VENTILATION SYSTEM SETTINGS (S86N MUPR ONLY)

System setting|

Description

| Factory default setting (bold) and setting range
Low Vent RH Limit| Sets the ventilation indoor RH lockout limit. (Only available if Low Vent RH Limit is set to E n a b le d.)| 20%

10% to 30%

High Vent Temperature Limit| Enables high ventilation temperature lockout limit. (Only available if an outdoor sensor option is enabled.)| Disabled

Enabled

High Vent Temperature Limit| Sets high ventilation temperature lockout limit. (Only available if High Vent Temperature Limit is set to E n a b le d.)| 100°F (38°C)

85°F to 105°F (29°C to 41°C)

Low Vent Temperature Limit| Enables low ventilation temperature lockout limit. (Only available if an outdoor sensor option is enabled.)| Disabled

Enabled

Low Vent Temperature Limit| Sets low ventilation temperature lockout limit. (Only available if Low Vent Temperature Limit is set to E n a b le d.)| 10°F (-12°C)

-10°F to 40°F (-24°C to 6°C)

HVAC Fan

with Vent?

| Selects if ventilation forces the fan on. (Yes with high and low limits is only available if an outdoor sensor option is enabled.)| Yes

Yes with high and low limits No

TABLE 5 – FRESH AIR VENTILATION SYSTEM SETTINGS (S86N MUPR ONLY)

System setting|

Description

| Factory default setting (bold) and setting range
High Mixing Temperature| Enables high mixing temperature.

(Only available is HVAC Fan with Vent is set to

Yes with high and low li m i t s.)

| Disabled

Enabled

High Mixing Temperature| Sets the high mixing temperature.

(Only available if High Mixing Temperature is set to E n a b le d.)

| 80°F or (26°C)

60°F to 105°F (14°C to 41°C)

Low Mixing Temperature| Enables low mixing temperature.

(Only available is HVAC Fan with Vent is set to

Yes with high and low li m i t s.)

| Disabled

Enabled

Low Mixing Temperature| Sets the Low mixing temperature.

(Only available if Low Mixing Temperature is set to E n a b le d.)

| 40°F (6°C)

0°F to 50°F (-18°C to 12°C)

Fresh Air Reminder| Enable or disable the Service Fresh Air message.| Disabled

Enabled

Recurrence| Select number of months between Service Fresh Air messages.| 12 Months

1 to 12 Months

The system test menu is used to test a system after installation. The Installer Test can be accessed from the Installer Menu. All equipment outputs that are configured in the installer settings can be turned on and off for testing equipment. Minimum on and off times are not enforced while in this mode. The instructions below show how to enter the test mode and turn outputs on and off.

ENTER THE SYSTEM TEST MENU

Press Select to enter the Main Menu.
Use or to navigate to Settings, press Select.
Press and hold and for 3 seconds to unlock the Installer option.
Use or to select Installer Settings, press Select.
Use or to select System Test, press Select.

SYSTEM TEST STEPS

Heating equipment test.
Cooling equipment test.
Fan equipment test.
Humidification equipment test.
Dehumidification equipment test.
Ventilation equipment test.

$Aprilaire-S86N-MU-Multi-Stage-Universal-Thermostat-fig- $13$$

QUICK REFERENCE TO CONTROLS & DISPLAY

HOME SCREEN

$Aprilaire-S86N-MU-Multi-Stage-Universal-Thermostat-fig- $14$$

$Aprilaire-S86N-MU-Multi-Stage-Universal-Thermostat-fig- $15$$

SCREEN SAVER

Starts 45 seconds after inactivity, press any button to wake the screen.

$Aprilaire-S86N-MU-Multi-Stage-Universal-Thermostat-fig- $16$$

TROUBLESHOOTING

DISPLAY IS BLANK

Check circuit breaker and reset if necessary.
Make sure power switch at heating & cooling system is on.
Make sure furnace door is closed securely.
HEATING SYSTEM DOES NOT RESPOND (“HEATING” APPEARS ON SCREEN)
Check for 24VAC at the equipment on the secondary side of the transformer between power and common. If voltage is not present, check the heating equipment to find the cause of the problem.
Check for 24VAC between the heat terminal (W) and the transformer common. If 24VAC is present, the thermostat is functional. Check the heating equipment to find the cause of the problem.
Check for loose or broken wires between the thermostat and the heating equipment.

TEMPERATURE SETTINGS DO NOT CHANGE

Make sure heating and cooling temperatures are set to acceptable ranges:
- Heat: 40° to 90°F (4° to 32°C).
- Cool: 50° to 99°F (10° to 37°C).
  COOLING SYSTEM DOES NOT RESPOND (“COOLING” APPEARS ON SCREEN)
Check for 24VAC at the equipment on the secondary side of the transformer between power and common. If voltage is not present, check the cooling equipment to find the cause of the problem
Check for 24VAC between the cooling terminal (Y) and the transformer common. If 24VAC is present, the thermostat is functional. Check the cooling system to find the cause of the problem.
Check for loose or broken wires between the thermostat and the cooling equipment.

FAN DOES NOT TURN ON IN A CALL FOR HEAT

Check System Setting (Fan Control in Heating), to make sure the fan control is properly set to match the type of system.

HEAT PUMP ISSUES COOL AIR IN HEAT MODE, OR WARM AIR IN COOL MODE

Check System Setting (O/B Operation) to make sure the reversing valve operation matches the heat pump.

HEAT/COOL BOTH ON AT SAME TIME.

Check System Setting (Equipment Type), to make sure it is set to match the installed heating/cooling equipment.
Check to make sure heating and cooling wires are not shorted together.

HEATING EQUIPMENT IS RUNNING IN COOL MODE

Check System Setting (Equipment Type), to make sure it is set to match the installed heating/cooling equipment.

“HEATING” IS NOT DISPLAYED

Check System Setting (Control Setup) is set correctly.
Change the System Mode to Heat, and set the temperature level above the current room temperature.

“COOLING” IS NOT DISPLAYED

Check System Setting (Control Setup) is set correctly.
Change the System Mode to Cool, and set the temperature level below the current room temperature.

HUMIDIFIER DOES NOT OPERATE IN AUTO MODE (S86N MUPR ONLY)

Check Installer System Setting number (Outdoor Sensor) is set to Yes.
Verify that the outdoor sensor is functioning correctly. If the sensor is functioning correctly the outdoor temperature will display in the outdoor temperature location (see SCREEN SAVER on page 39 for the location).

ERROR CODES
If the thermostat enters an error mode, all outputs are turned off. The thermostat attempts to recover every 10 minutes.

Error Code	Message	Error Description
E01	Sensor Error	Internal temperature & RH sensor failure
E03	EEPROM Error	Error in permanent memory
E06	Remote Sensor Error	Open remote temperature sensor circuit
E07	Remote Sensor Error	Shorted remote temperature sensor circuit

THERMOSTAT FEATURES

Indoor air quality control (S86N MUPR only).
- Humidification automatic or manual control.
- Dehumidification.
- Event-Based™ air cleaning.
- Ventilation with temperature and humidity limits.
Heat Blast® raises the room temperature 3°F to 5°F.
Easy to read, color graphical display.
Easy to use installer settings, no codes.
7 day programmability.
Displays room temperature, temperature setting, and outdoor temperature.
Displays room humidity (S86N MUPR only).
Air filter, humidifier, dehumidifier, and HVAC service reminders.
Programmable fan control with fan circulation mode.
Easy to use temperature control can override program schedule at any time.
Progressive recovery ensures proper room temperature at the start of a program event.
Built in compressor protection prevents damage to your equipment.
System test mode.
Sensor averaging and the ability to assign a sensor to a scheduled event.
Installer adjustable set point limits.