AprilAire S86W MUPR Wi-Fi Thermostat with IAQ — Safety & Installation Guide

Complete safety, installation, and reference guide for the AprilAire Model S86W MUPR Wi-Fi Thermostat with Indoor Air Quality (IAQ) control.

Installation Location Recommendations

Mount the thermostat:

• On an interior wall, in a frequently occupied space
• Approximately 5 feet above the floor
• At least 18" from an outside wall
• Can be mounted to a vertical junction box

Do not mount the thermostat:

• Behind doors, in corners, or other dead air spaces
• In direct sunlight, near lighting fixtures, or heat-emitting appliances
• 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)

Attach the included 8052 sensor to terminals T1 and T2 (must be enabled in the installer setup menu). Heat pump models use it to lock out/enable auxiliary vs. heat pump heating based on Low/High Balance Points. IAQ functions use it to prevent condensation and control ventilation lockout.

Mount the outdoor sensor: on the north side of the building (out of direct sun), above the snow line, at least 3 feet from exhaust vents/condensing lines, using less than 300 ft of wire, not routed along 120VAC lines.

Remote Temperature Sensor (Optional)

An 8051 (flush mount) or 8053 (surface mount) sensor can be attached to T1/T2 for control from a concealed location, or averaged with the internal sensor for large spaces. Must be enabled in installer setup. Follows the same mounting guidance as the thermostat itself (avoid direct sun, dead air spaces, 120VAC lines, concealed pipes/ductwork).

Wireless Sensors

• Model Z10IDT (Indoor Temperature and Humidity Sensor) — up to 8 can connect; automatically averaged, or individually selected for scheduled events.
• Model Z10ODT (Outdoor Temperature and Humidity Sensor) — one can connect.

Thermostat Mounting

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

Power and Reset

Powered by 24VAC. Maintains the clock for 2 hours on power loss (memory backup saves settings during interruption). Can be reset to factory defaults from the installer settings menu. Note: factory reset does not clear thermostat account info from the AprilAire Wi-Fi app — remove the thermostat from the app or use the unregister option in Wi-Fi settings to clear that.

Wiring Terminals

*Jumper between RC & RH is used in single transformer systems. Wire: 18-24 gauge thermostat wire. Ensure power at the HVAC equipment is off before wiring; loosen screw terminals, insert stripped wire, retighten; push excess wire back into the wall opening and plug to prevent drafts.

Wiring Diagram Types

Full illustrated wiring diagrams for each configuration are in the downloadable PDF. Covered configurations:

• Single & Multi Stage Heat/Cool, One Transformer
• Single & Multi Stage Heat/Cool (e.g. Boiler), Two Transformer
• Single & Multi Stage Heat Pump, One Transformer
• Radiant & Heat/Cool, One Transformer
• Radiant & Heat Pump, One Transformer
• Indoor Air Quality Equipment wiring diagrams

System Test Menu

Used to test the system post-installation from the Installer Menu — turns configured equipment outputs on/off for testing (minimum on/off times not enforced in this mode).

1. Press Select to enter the Main Menu.
2. Navigate to Settings, press Select.
3. Press and hold Up/Down arrows for 3 seconds to unlock the Installer option.
4. Navigate to Installer Settings, press Select.
5. Navigate to System Test, press Select.

Test steps cover: Heating equipment, Cooling equipment, Fan equipment, Humidification equipment, Dehumidification equipment, and Ventilation equipment.

Troubleshooting

Error Codes

When the thermostat enters an error mode, all outputs turn off. It attempts to recover automatically every 10 minutes.

Features

• Remote access and control over Wi-Fi
• Indoor air quality control: humidification (auto/manual), dehumidification, Event-Based™ air cleaning, ventilation with temperature/humidity limits
• Heat Blast® raises room temperature 3-5°F
• Color graphical display; 7-day programmability
• Displays room temp, room humidity, temperature setting, outdoor temperature
• Air filter, humidifier, dehumidifier, and HVAC service reminders
• Programmable fan control with fan circulation mode
• Progressive recovery ensures proper room temperature at program event start
• Built-in compressor protection
• System test mode; optional wireless indoor/outdoor sensors with averaging; installer-adjustable set point limits

Specifications