Aprilaire 8400 Programmable Thermosta Safety & Installation Instructions

Aprilaire 8400 Programmable Thermostat

 

INSTALLATION

installation LOCATION RECOMMENDATIONS
The thermostat should be mounted;

• On an interior wall. in a frequently occupied space.
• Approximately 51 above the floor.
• At least 181 1 from the outside wall.
• The thermostat 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 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 (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:

• When the outdoor temperature is less than the Low
• Balance Point, the heat pump will be locked out and only auxiliary heating will be used.
• 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.
• Install on side of the building out of direct sunlight (north side recommended).
• Mount above the snow line.
• Mount at least 3′ away from exhaust vents and condensing lines.
• Maximum wire length is 300′.
• Do not route wires along 120 VAC lines.

THERMOSTAT MOUNTING

1. Remove the back of the thermostat, by pressing the tab on the bottom of the unit.
2. Pull wires through the opening on the back of the thermostat.
3. Position and level the back of the thermostat on the wall and mark the hole locations with a pencil.
4. Drill 1/4″ holes & insert supplied anchors (drywall only).
5. Place back over anchors, and insert and tighten screws.
6. Seal wire entry holes to prevent drafts from affecting temperature readings.

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 to a 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

• Ensure power at the HVAC equipment is off.
• Loosen screw terminals, insert the stripped wire, and re-tighten.
• Push the excess wire back into the opening and plug the wall opening to prevent drafts.

• RC – 24 VAC supply cooling*
• R – 24 VAC supply heating*
• W – 1st stage heat/ auxiliary
• V – 1st stage cooling/ compressor
• G- Fan
• C – RC 24VAC common (optional when powered by batteries)
• S1 & S2 – outdoor temperature sensor (optional)
• 0/8 – Reversing valve
• L – System fault indicator
  W2 – 2nd stage heat/ auxiliary
• V2 – 2nd stage cooling/ compressor
• 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 THE HEAT/COOL SYSTEM
WIRING – MODEL 8466 & 8448 TWO TRANSFORMERS (REMOVE JUMPER WIRE) FOR THE HEAT/COOL SYSTEM

 

WIRING – MODEL 8466 & 8448 SINGLE TRANSFORMER (USE JUMPER WIRE) FOR THE HEAT PUMP SYSTEM
WIRING – MODEL 8466 & 8448 TWO TRANSFORMERS (REMOVE JUMPER WIRE) FOR THE HEAT PUMP SYSTEM

 

SETUP AND TESTING

SYSTEM SETUP INSTRUCTIONS
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 repeatedly until the system is set to OFF.
• Press and hold for three seconds.
• The screen of the first set will be displayed.
• Pressor changes the setting.
• Press to change to the next option.
• Press after the last setting. “DONE” will be displayed.
• The thermostat will save changes and return to Normal mode if no key is pressed for 20 seconds.
• To reset all system settings back to default, press the RESET button is located under the battery door

SYSTEM SETUP INSTRUCTIONS (CONTINUED)

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 wi ll 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 changeovermode 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.

• 1 = more rapid staging of equipment (comfort).
• 5 = slower staging of equipment (economy).

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. If the humidifier type is set to Flow through, then the first reminder is based on system setting 21, the second reminder will activate 12 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)

SYSTEM TEST MODE (CONTINUED)
How to enter the system test menu

Press repeatedly until the system is set to OFF.
Press and hold for three seconds.
The screen of the first test step #50 is displayed:

Press to turn on the output (01 ). For multi-stage
output, press again to turn on the 2nd stage (02).
Press   turn off the output (00).
Press to change to the next test step.
Press after the last test step. “DONE” will be displayed.
The thermostat will return to Normal mode if no key is pressed in 20 seconds.

 

QUICK REFERENCE TO CONTROLS & DISPLAY

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.

THERMOSTATS FEATURES

ALL 8400 SERIES THERMOSTATS

• The large, clear, backlit display is easy to read – even in the dark.
• Displays room temperature, temperature setting, and optional outdoor temperature.
• Dual power option (Battery or 24 VAC).
• Front battery door access for fast, easy replacement.
• Bui lt in compressor protection.
• Circulation fan mode for air cleaning.
• Water panel, dehumidifier, air filter, and HVAC service indicators.
• System test mode.

PROGRAMMABLE MODELS ONLY (8463, 8465, 8466)

• Separately programmable weekday/weekend schedules.
• Easy-to-use temperature control can override the program schedule at any time.
• Progressive recovery. The progressive Recovery feature allows the thermostat to activate the heating and cooling equipment prior to an event in order to reach the desired temperature at the start of the next scheduled event.

TROUBLESHOOTING

DISPLAY IS BLANK

• Check the circuit breaker and reset if necessary.
• Make sure the power switch at the heating & cooling system is on.
• Make sure the furnace door is closed securely.
• If the thermostat is battery-powered, make sure fresh AA alkaline batteries are correctly installed.

TEMPERATURE SEliTINGS DO NOT CHAN.GE
Make sure heating and cooling temperatures are set to acceptable ranges:

• Heat: 45° to 90° F· (7° to 32°C).
• Cool: 50° to 99° F (10° to 37° C).

THE HEATING SYSTEM DOES NOT RESPOND (“HEATING” APPEARS ON THE SCREEN)

• Check for 24 VAC at the equipment on the secondary side of the transformer between the power and common. If voltage is not present, check the heating equipment to find the cause of the problem.
• Check for 24 VAC between the heat terminal (W) and the transformer is common. If 24 VAC 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 heating equipment.

THE COOLING SYSTEM DOES NOT RESPOND (“COOLING” APPEARS ON THE SCREEN)

• Check for 24 VAC 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 24 VAC between the cooling terminal (Y) and the transformer is common. If 24 VAC 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.

THE FAN DOES NOT TURN ON IN A CALL FOR HEAT

• Check System Setting #02 (Fan Control), to make sure the fan control is properly set to match the type of the system (see page 11 ).

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

• Check System Setting #12 (Reversing Valve), to make sure it is properly configured for your system (see page 11 ).

HEAT/COOL BOTH ON AT THE SAME TIME

• Check SW1 (Equipment Type), to make sure it is set to match the installed heating/cooling equipment (see page 12).
• Check to make sure the heating and cooling wires are not shorted together.

THE HEATING EQUIPMENT IS RUNNING IN COOL MODE 

• Check SW1 (Equipment Type), to make sure it is set to match the installed heating/cooling equipment (see page 12).

“HEATING” IS NOT DISPLAYED

• Change the System Mode to Heat, and set the temperature level above the current room temperature.

“COOLING” IS NOT DISPLAYED

• Change the System Mode to Cool, and set the temperature level below the current room temperature.

SPECIFICATION

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)

Electrical
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

REFERENCE:

Download Manual: Aprilaire 8400 Programmable Thermostat Safety & Installation Instructions

Aprilaire 8400 Programmable Thermosta Safety & Installation Instructions