Aprilaire 8448 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 8448

User Manual2 pages

Safety & Installation Instructions15 pages

Features2 pages

Questions and Answers:

J
Johnathan HowardJul 25, 2025
What to do if the Aprilaire Thermostat heating system does not respond?
- J
  Jeremy HuntJul 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).
J
Jennifer JohnsonAug 2, 2025
Why is my Aprilaire Thermostat cooling system not responding?
- T
  Thomas DavisAug 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
miguel31Aug 10, 2025
What to do if Aprilaire Thermostat heating equipment is running in cool mode?
- J
  Julie MoyerAug 10, 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.
H
hholtAug 17, 2025
Why is my Aprilaire 8448 heat pump blowing cool air in heat mode?
- M
  Mr. Gavin Wolf PhDAug 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 8448 Specifications

General

Wi-Fi Connectivity	No
Mobile App	No
Product Type	Thermostat
Programmability	7-day programmable
Connectivity	Wired
Smart Home Compatibility	No
Voltage	24V AC
Power Method	24V
Features	Humidity control, temperature control
Control Type	Digital

Summary

Thermostat Operation (All Models)

Select System Mode

Guide to selecting system modes like HEAT, COOL, AUTO, OFF, and EM-HEAT.

Change Temperature Setting

Instructions on how to adjust the desired temperature setting.

Select Fan Setting

Describes fan settings: ON (continuous), AUTO (with system), and CIRC (periodic).

Reset Service Reminder Messages

Battery Installation and Reset Button

Programmable Model Operation

Set Time and Day

Step-by-step guide to setting the current time and day on the thermostat.

Understanding Program Schedules

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

Program Schedule Details

Provides default start times and temperature settings for Heat and Cool modes.

Progressive Recovery Feature

Programmable Schedule Customization

Changing Program Schedules

Instructions for modifying start times and temperature settings for WAKE, LEAVE, RETURN, SLEEP.

Weekend Program Settings

Program Schedule Overrides

Temporary Program Override

Permanent Program Override

Electronic Thermostat Limited Warranty

Five Year Limited Warranty

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