INSTALLATION LOCATION RECOMMENDATIONS
The thermostat should be mounted
Do not mount the thermostat
OUTDOOR TEMPERATURE SENSOR (OPTIONAL)
Outdoor temperature can be measured by attaching an 8052 sensor to the S1 and S2 terminals. System setting #05 (Remote sensor) is used to enable the sensor. Heat pump models can use the outdoor temperature to effectively utilize the heat pump:
POWER & RESET OPTIONS
The thermostat is dual power. It can either be AC or battery powered, or both (to provide backup power for the clock). Batteries are optional if the thermostat was connected to AC power when installed. For heat pump models (8446 and 8465) and universal models (8448 and 8466) used in heat pump applications, 24 VAC must be connected in order for the system fault and emergency heat indicators to operate.The thermostat has a memory backup that saves the thermostat’s settings in case of a power interruption. The reset button located under the battery cover can be used to reset the thermostat back to factory defaults. The system settings will also be reset back to defaults.
WIRING TERMINAL
Wire specifications
18-24 gauge thermostat wire
Installation notes
A jumper between RC & R is used in single transformer systems (see wiring diagrams).
WIRING – MODEL 8463 & 8444 SINGLE TRANSFORMER (USE JUMPER WIRE)
WIRING – MODEL 8463 & 8444 TWO TRANSFORMERS (REMOVE JUMPER WIRE)
WIRING – MODEL 8465 & 8446 SINGLE TRANSFORMER (USE JUMPER WIRE)
WIRING – MODEL 8465 & 8446 TWO TRANSFORMERS (REMOVE JUMPER WIRE)
WIRING – MODEL 8466 & 8448 SINGLE TRANSFORMER (USE JUMPER WIRE) FOR HEAT/COOL SYSTEM
WIRING – MODEL 8466 & 8448 TWO TRANSFORMERS (REMOVE JUMPER WIRE) FOR HEAT/COOL SYSTEM
WIRING – MODEL 8466 & 8448 SINGLE TRANSFORMER (USE JUMPER WIRE) FOR HEAT PUMP SYSTEM
WIRING – MODEL 8466 & 8448 TWO TRANSFORMERS (REMOVE JUMPER WIRE) FOR HEAT PUMP SYSTEM
The following instructions show how to enter the system setup menu and change settings. The table on the following pages lists the settings and their details. Default settings are shown in bold. Some settings are only available to certain models, and some are specific to thermostats set to heat pump mode.
How to enter the system setup menu to change system settings
Press
Press
Thermostat models 8448 & 8466 have the option of being used in heat pumps or heat/cool systems. The equipment type switch located on the back of the thermostat’s face is used to select this. System setting number 00 will only be shown on these models to display the position of the equipment type switch.
SYSTEM SETUP INSTRUCTIONS (CONTINUED)
00 Equipment type (8466, 8448) (Set by the equipment type switch) | O : heat/cool 1 : heat pump |
01 Temperature scale | 0 : Fahrenheit 1 : Celsius |
02 Heat/ Cool: Fan control in heating Heat Pump: Auxiliary equipment type | o: Gas or oil furnace (Equipment controls fan) Note: Used for Dual Fuel applications 1 : Electric (Thermostat controls fan) |
03 Offset temperature for internalsensor | 0° : No offset applied – 4°F to +4°F (- 2°C to +2°C) |
04 Auto changeovermode | O : Auto changeover mode is disabled 1 : Auto changeover mode is enabled |
05 Outdoor temperature sensor | O : No outdoor temperature sensor attached 1 : Outdoor temperature sensor attached |
06 Compressor minimum off time | 5 minutes 1 to 5 minutes in 1-minute steps |
07 Heating minimum off time | 2 minutes 1 to 5 minutes in 1 minute steps |
08 Equipment minimum on time | 2 minutes 1 to 5 minutes in 1 minute steps |
09 1st stage differential | 1Of ,(0 5°C) 1°F to 4°F (0.5°C to 2°C) | |
10 2nd stage differentia l (8448, 8466) | 1Of ,(0 5°C) 1°F to 4°F (0.5°C to 2°C) | |
11 3rd and 4th stage differential (8448HP, 8466HP) | 1Of ,(0 5°C) 1°F to 4°F (0.5°C to 2°C) | |
12 | Reverse valve (8446, 8448HP, 8465, 8466HP) | O – 0/8 energized in cooling (O) 1 – 0/B energized in heating (B) |
13 | Stage rate* | 4 1 to 5 or “OFF” to disable |
14 | Deadband (auto mode) | 3°f (2°C) 2°F to 5°F (1°C to 3°C) |
15 Progressive recovery (8463, 8465, 8466) | O : Progressive recovery is disabled 1 : Progressive recovery is enabled |
Accumulation of equipment run time in equipment staging determination.
16 Low Balance Pt. (8446, 8448HP, 8465, 8466HP) System setting 05 must be enabled | 20°F (- 7°C) 1°F to 35°F (- 17°C to 1°C) or “OFF” to disable | |
17 High Balance Pt. (8446, 8448HP, 8465, 8466HP) System setting 05 must be enabled | 60°F (16°C) 40°F to 80°F (4°C to 27°C) or “OFF “to disable | |
19 Program format (8463, 8465, 8466) | 0 – 5/2 program (Weekdays and Weekends) 1 – 5/1/1 program (Weekdays, Sat. and Sun.) | |
20 | Change air filter | OFF 1, 3, 6, 12 months or ” OFF” to disable |
21 Change water panel* * Set number of months until reminder is required | OFF 1 to 12 months or “OFF” to disable | |
22 | Humidifier type** | 0 : Flow through type humidifier (1 reminder per season) 1 : Drain-less type humidifier (2 reminders per season) |
23 Service dehumidifier | OFF 1 to 12 months or “OFF” to disable | |
24 | Service HVAC | OFF 1 to 12 months or “OFF” to disable |
If the humidifier type is set to Drain-less, then the first reminder is based on the system setting 21, the second reminder will activate 3 months later.
SYSTEM TEST MODE
The system test mode is used to test a system after installation. The outputs of the thermostat can be manually activated one at a time to test their function. The following instructions show how to enter the test mode and turn outputs on and off. The charts on the following pages show all of the options for each model.
The test steps are:
50 | Heating (W) (W2) | Aux Heating (W) (W2) |
51 | Cooling (Y) (Y2) | Compressor Cooling (Y) (Y2) |
52 | Fan (G) | Compressor Heating (Y) (Y2) |
53 | Fan (G) |
How to enter the system test menu
Press
Pres
Press
Press
Press
The thermostat will return to Normal mode if no key is pressed in 20 seconds.
Step Key Input | #2 | #12 | 01 AUX HEATING ON (W) | 01 COOL/HEAT ON (V) | 01 FAN ON (G) | 0/B | |||
#50 Aux | [UP] | 0 : Gas | ON | ||||||
1 : Elec | ON | ON | |||||||
[DOWN] | |||||||||
#51 Cool | [UP] | 0 : 0 | ON | ON | ON | ||||
1 : B | ON | ON | |||||||
[DOWN] | 0 : 0 | ON | |||||||
1 : B | |||||||||
#52 Heat | [UP] | 0:0 | ON | ON | |||||
1 : B | ON | ON | ON | ||||||
[DOWN] | 0:0 | ||||||||
1 : B | ON | ||||||||
#53 Fan | [UP] | ON | |||||||
[DOWN] |
Step Key Input | #2 | #12 | 01 AUX HEATING ON (W) | 02AUX HEATING ON (W2) | 01 COOL/HEAT ON (V) | 02 COOL/HEAT ON (Y2) | 01 FAN ON (G) | 0/B | |
#50 Aux | 1st [UP] | 0: Gas | ON | ||||||
1 : Elec | ON | ON | |||||||
2nd [UP] | 0: Gas | ON | ON | ||||||
1 : Elec | ON | ON | ON | ||||||
[DOWN] | |||||||||
#51 Cool | 1st [UP] | 0 : 0 | ON | ON | ON | ||||
1 : B | ON | ON | |||||||
2nd [UP] | 0:0 | ON | ON | ON | ON | ||||
1 : B | ON | ON | ON | ||||||
[DOWN] | 0:0 | ON | |||||||
1 : B | |||||||||
#52 Heat | 1st [UP] | 0:0 | ON | ON | |||||
1 : B | ON | ON | ON | ||||||
2nd [UP] | 0 : 0 | ON | ON | ON | |||||
1 : B | ON | ON | ON | ON | |||||
[DOWN] | 0 : 0 | ||||||||
1 : B | ON | ||||||||
#53 Fan | [UP] | ON | |||||||
[DOWN] |
NON-PROGRAMMABLE MODELS (8444, 8446, 8448)
NOTE: BACKLIGHT IS ACTIVATED WITH THE FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.
PROGRAMMABLE MODELS (8463, 8465, 8466)
NOTE: BACKLIGHT IS ACTIVATED WITH THE FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.
ALL 8400 SERIES THERMOSTATS
TEMPERATURE SETTINGS DO NOT CHANGE
Make sure heating and cooling temperatures are set to acceptable ranges:
THE HEATING SYSTEM DOES NOT RESPOND (“HEATING” APPEARS ON THE SCREEN)
HEAT/COOL BOTH ON AT THE SAME TIME
THE HEATING EQUIPMENT IS RUNNING IN COOL MODE
Environment | |
Temperature | Operating: 32° to 120°F (0° to 48.9°C) Shipping: -30° to 140°F (-34.4° to 60°C) |
Relative humidity | Operating: 5% to 90% R.H. (non-condensing) |
Operating voltage | 24 VAC (18 – 30 VAC) |
Current | Maximum: 2.5A (total), 1.0A (si ngle output) Maximum surge current: 5A |
Power supply | Dual power. Can be battery or 24 VAC powered. When both the sources are available, battery will be used as back up power. |
Battery power | Battery power: AA size alkaline battery x 2 Battery life: Approximately 1 year |
Thermal | |
Outdoor temperature sensor | Maximum distance: 300 feet |
Room temperature measurement | Display range: 32° to 99°F (0° to 40°C) |
Outdoor temperature measurement | Display range: -20° to 130°F (-30° to 55°C) |
Temperature setting range | Heat: 45° to 90°F (7° to 32°C) Cool: 50° to 99°F (10° to 37°C) |
P.O. Box 1467 Madison, WI 53701-1467 Phone: 800/334-6011 Fax: 608/257-4357 www.aprilairepartners.com
Download Manual: Aprilaire 8400 Series Dual-Stage Heating/Cooling Thermostat Safety and Installation Instruction
Aprilaire 8400 Series Dual-Stage Heating/Cooling Thermostat Safety and Installation Instruction
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