Aprilaire 8446 User Manual

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8400 Series Thermostats

READ AND SAVE THESE INSTRUCTIONS

Owner’s Manual

Includes

Operating Instructions and

Warranty Information

61000651C 8400 Tstat Owners.indd 1 10/13/09 11:13:35 AM

Other manuals for Aprilaire 8446

User Manual2 pages

Safety & Installation Instructions15 pages

Features2 pages

Questions and Answers:

A
ariel65Jul 25, 2025
What to do if the Aprilaire 8446 Thermostat heating system does not respond?
- U
  uchandlerJul 25, 2025
  If your Aprilaire thermostat's heating system isn't responding ('HEATING' appears on the screen), try these steps: First, check the circuit breaker and reset it if needed. Next, ensure the power switch at your heating and cooling system is turned on. Also, make sure the furnace door is securely closed. If your thermostat uses batteries, ensure fresh AA alkaline batteries are correctly installed. Finally, verify that your heating temperature is set between 45° to 90°F (7° to 32°C).
M
Mark BrownAug 2, 2025
Why is my Aprilaire 8446 Thermostat cooling system not responding?
- P
  Pamela HumphreyAug 2, 2025
  If your Aprilaire thermostat's cooling system isn't responding ('COOLING' appears on the screen), consider the following: Check for 24 VAC at the equipment on the secondary side of the transformer between power and common. If voltage is absent, inspect the cooling equipment to identify the problem. Verify there's 24 VAC between the cooling terminal (Y) and the transformer common. If present, the thermostat is likely functional, so check the cooling system. Inspect for loose or broken wires between the thermostat and the cooling equipment. Ensure SW1 (Equipment Type) is correctly set to match your installed heating/cooling equipment. Lastly, confirm that heating and cooling wires are not shorted together.
M
Mariah LittleAug 8, 2025
What to do if Aprilaire 8446 heating equipment is running in cool mode?
- S
  Sara HernandezAug 9, 2025
  If your heating equipment is running in cool mode on your Aprilaire Thermostat, you can try the following: Check System Setting #02 (Fan Control) to ensure the fan control is correctly set to match your system type. Also, change the System Mode to Heat and set the temperature higher than the current room temperature.
S
sdavisAug 17, 2025
Why is my Aprilaire 8446 Thermostat heat pump blowing cool air in heat mode?
- J
  Joseph StoneAug 17, 2025
  If your heat pump is blowing cool air in heat mode, or warm air in cool mode, with your Aprilaire Thermostat, check System Setting #12 (Reversing Valve). You can also try changing the System Mode to Cool, and set the temperature level below the current room.

Aprilaire 8446 Specifications

General

Brand	Aprilaire
Model	8446
Category	Thermostat
Language	English

Summary

About Your New Thermostat

Operation – All Models

Select System Mode

Change Temperature Setting

Operation – All Models (Continued)

Operation & Programming – Programmable Models Only

Set Time and Day

Understanding Program Schedules

Explains the four daily schedule periods: WAKE, LEAVE, RETURN, and SLEEP.

Operation & Programming – Programmable Models Only (Continued)

Understanding Program Schedules (Continued)

Provides a table of default schedule times and temperature settings for Heat and Cool.

Changing Program Schedules

Step-by-step guide to modify programmed schedule times and temperatures for weekdays/weekends.

Program Schedule Overrides (Temporary, Permanent)

Explains how to temporarily or permanently override programmed temperature settings.

Progressive Recovery

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