Aprilaire Thermostat 8476 Users Manual

8476 c22f763b-dabf-409d-94ec-cd27b042a0ef Aprilaire Thermostat 8476 User Guide |

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Model 8476 Thermostat with

Event-Based™ Air Cleaning

READ AND SAVE THESE INSTRUCTIONS

Safety &

Installation

Instructions

2 3

Installation location recommendations................................................................3

Outdoor temperature sensor (optional) ................................................................4

Thermostat mounting..............................................................................5

Power & reset options.............................................................................5

Wiring terminal ..................................................................................6

Wiring diagrams .................................................................................7

TABLE OF CONTENTS

INSTALLATION

SETUP & TESTING

REFERENCES

System setup instructions ..........................................................................9

System test mode ...............................................................................14

Quick reference to controls & display................................................................18

Thermostat features .............................................................................19

Troubleshooting .................................................................................20

Specifications...................................................................................22

INSTALLATION

INSTALLATION LOCATION RECOMMENDATIONS

Thermostat should be mounted:

• On an interior wall, in a frequently occupied space.

• Approximately 5‘ above floor.

• At least 18” from outside wall.

• Thermostat can be mounted to a vertical junction box.

Do not mount 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.

4 5

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 sensor.

Heat pump applications 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.

INSTALLATION

C

G

Y

W

RL

S1 S2 O/B W2 Y2

RC

• Install on side of building out of direct sunlight

(north side recommended).

• Mount above 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 wall

and mark the hole locations with a pencil.

4. Drill 1/4” holes & insert supplied anchors (drywall only).

5. Place back over anchors, insert and tighten screws.

6. Seal wire entry holes to prevent drafts affecting

temperature readings.

INSTALLATION

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.

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.

6 7

WIRING TERMINAL

Wire specifications

18-24 gauge thermostat wire

Installation notes

• Ensure power at the HVAC equipment is off.

• Loosen screw terminals, insert stripped wire and

re-tighten.

• Push the excess wire back into the opening and plug

the wall opening to prevent drafts.

INSTALLATION

RC – 24 VAC supply cooling*

R – 24 VAC supply heating*

W – 1st stage heat / auxiliary

Y – 1st stage cooling / compressor

G – Fan

C – Common (optional when powered by batteries)

S1 & S2 – outdoor temperature sensor (optional)

O/B – Reversing valve

L – System fault indicator

W2 – 2nd stage heat / auxiliary

Y2 – 2nd stage cooling / compressor

* Jumper between RC & R is used in single transformer systems

(see wiring diagrams).

C

G

Y

W

RL

S1 S2 O/B W2 Y2

RC

WIRING – SINGLE TRANSFORMER (USE

JUMPER WIRE) FOR HEAT/COOL SYSTEM

INSTALLATION

1st HEATING

1st COOLING

FAN

2nd HEATING

2nd COOLING

OUTDOOR TEMP

SENSOR

NOT USED

NOT USED

JUMPER

TRANSFORMER

C

G

Y

W

RL

S1 S2 O/B W2 Y2

RC

WIRING – TWO TRANSFORMERS (REMOVE

JUMPER WIRE) FOR HEAT/COOL SYSTEM

1st HEATING

1st COOLING

FAN

2nd HEATING

2nd COOLING

OUTDOOR TEMP

SENSOR

NOT USED

NOT USED

HEATING

TRANSFORMER

COOLING

TRANSFORMER

C

G

Y

W

RL

S1 S2 O/B W2 Y2

RC

8 9

INSTALLATION

WIRING – SINGLE TRANSFORMER (USE

JUMPER WIRE) FOR HEAT PUMP SYSTEM

1st AUX HEATING

1st COMPRESSOR

FAN

REVERSE VALVE

FAULT DETECT

2nd AUX HEATING

2nd COMPRESSOR

OUTDOOR TEMP

SENSOR

HEAT PUMP

TRANSFORMER

C

G

Y

W

RL

S1 S2 O/B W2 Y2

RC

JUMPER

1st AUX HEATING

1st COMPRESSOR

FAN

REVERSE VALVE

FAULT DETECT

2nd AUX HEATING

2nd COMPRESSOR

OUTDOOR TEMP

SENSOR

HEATING

TRANSFORMER

HEAT PUMP

TRANSFORMER

C

G

Y

W

RL

S1 S2 O/B W2 Y2

RC

WIRING – TWO TRANSFORMERS (REMOVE

JUMPER WIRE) FOR HEAT PUMP SYSTEM

SYSTEM SETUP INSTRUCTIONS

How to enter the system setup menu to change

system settings

Press repeatedly until system is set to OFF.

Press and hold and for three seconds.

The screen of the first setting will be displayed.

SETUP & TESTING

Press or to change the setting.

Press to change to the next option.

Press after the last setting. “DONE” will be

displayed.

The thermostat will return to Normal mode if no button

is pressed in 3 seconds.

To reset all system settings back to default, press the

RESET button located under the battery door.

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 based on other setting values.

SYSTEM SETTING NUMBER

SETTING VALUE

10 11

SETUP & TESTING

SYSTEM SETUP INSTRUCTIONS (CONTINUED)

The Model 8476 thermostat has the option of being used in heat pump or heat/cool systems. Switch SW1 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 SW1.

SW1

HEAT PUMP

HEAT/COOL

SETUP & TESTING

System setting Setting range, default in bold

00 Equipment type (Set by SW1) 0 : heat/cool

1 : heat pump

01 Temperature scale 0 : Fahrenheit

1 : Celsius

02 Fan control in heating 0 : Gas or oil furnace (Equipment controls fan)

1 : Electric (Thermostat controls fan)

03 Offset temperature for internal sensor 0° : No offset applied

–4°F to +4°F (–2°C to +2°C)

04 Auto mode 0 : Auto mode is disabled

1 : Auto mode is enabled

05 Outdoor temperature sensor 0 : 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

08 Equipment minimum on time 2 minutes

1 to 5 minutes

SYSTEM SETUP INSTRUCTIONS (CONTINUED)

12 13

SETUP & TESTING

System setting Setting range, default in bold

09 1st stage differential 1°F (0.5°C)

1°F to 4°F (0.5°C to 2°C)

10 2nd stage differential 1°F (0.5°C)

1°F to 4°F (0.5°C to 2°C)

11 3rd stage differential (heat pump only) 1°F (0.5°C)

1°F to 4°F (0.5°C to 2°C)

12 Reverse valve (heat pump only) 0 – O/B energized in cooling (O)

1 – O/B energized in heating (B)

13 Integral factor period (P+I control)*

Set to OFF for proportional control only

4 minutes

1 to 5 minutes 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 0 : Progressive recovery is disabled

1 : Progressive recovery is enabled

* The integral factor is used in the equipment control algorithm to maintain the space temperature at set point.

A short integral factor period will increase the number of cycles per hour. (A short integral factor period will be more

comfortable.) A long integral factor period will lower the number of cycles per hour. (A long integral factor period will

be more economical.)

SYSTEM SETUP INSTRUCTIONS (CONTINUED)

SETUP & TESTING

System setting Setting range, default in bold

16 Low Balance Pt. (heat pump only)

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. (heat pump only)

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 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)

** If humidifier type is set to Drain-less, then the first reminder is based on the system setting 21, second reminder

will activate 3 months later. If humidifier type is set to Flow through, then the first reminder is based on system

setting 21, second reminder will activate 12 months later.

SYSTEM SETUP INSTRUCTIONS (CONTINUED)

14 15

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 the output status for each test step for Heat/Cool and

Heat Pump mode.

The test steps are:

SETUP & TESTING

Test Number Heat/Cool Heat Pump

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 repeatedly until system is set to OFF.

Press and hold and for three seconds.

The screen of the first test step #50 is displayed:

SYSTEM TEST MODE (CONTINUED)

SETUP & TESTING

Press to turn on the output (01). For multi stage

output, press again to turn on the 2nd stage (02).

Press to 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 button is

pressed in 3 seconds.

SYSTEM TEST

NUMBER

OUTPUT STATUS

FLASHES IF 24VAC

IS NOT PRESENT

MODE (SW1 SETTING)

16 17

SETUP & TESTING

Test steps for Heat/Cool

Step Key Input

System Setting Display (Output)

#2

01

HEATING

ON (W)

02

HEATING

ON (W2)

01

COOLING

ON (Y)

02

COOLING

ON (Y2)

01

FAN ON

(G)

#50 Heat

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] ON ON

2nd [UP] ON ON ON

[DOWN]

#52 Fan [UP] ON

[DOWN]

Test steps for Heat Pump

Step Key Input

System Setting Display (Output)

#2 #12

01 AUX

HEATING

ON (W)

02 AUX

HEATING

ON (W2)

01

COOL/HEAT

ON (Y)

02

COOL/HEAT

ON (Y2)

01

FAN ON

(G)

O/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 : O ON ON ON

1 : B ON ON

2nd [UP] 0 : O ON ON ON ON

1 : B ON ON ON

[DOWN] 0 : O ON

1 : B

#52 Heat

1st [UP] 0 : O ON ON

1 : B ON ON ON

2nd [UP] 0 : O ON ON ON

1 : B ON ON ON ON

[DOWN] 0 : O

1 : B ON

#53 Fan [UP] ON

[DOWN]

SETUP & TESTING

18 19

QUICK REFERENCE TO CONTROLS & DISPLAY

NOTE: BACKLIGHT IS ACTIVATED WITH FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.

Includes Event-Based™ Air Cleaning

CURRENT INDOOR TEMPERATURE

SYSTEM MODE

SETTING

CLEAN AIR

SETTING

SYSTEM MODE

CLEAN AIR

BATTERY DOOR

CURRENT SCHEDULE PERIOD MESSAGE CENTER LOW BATTERY WARNING

QUICK REFERENCE CARD

OUTDOOR TEMPERATURE (OPTIONAL)

TEMPERATURE SETTING

EQUIPMENT STATUS

EMERGENCY HEAT (RED)

SYSTEM FAULT (YELLOW)

INDICATOR SHOWS THROUGH HOUSING

UP

DOWN

PROGRAM

HOLD

CURRENT TIME

THERMOSTAT FEATURES

• Event-Based™ Air Cleaning.

• 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.

• Built in compressor protection.

• Water panel and air filter service indicators.

• System test mode.

• Separately programmable weekday/weekend schedules.

• Easy to use temperature control can override program schedule at any time.

• Progressive recovery. 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.

HEAT PUMP ONLY

20 21

TROUBLESHOOTING

DISPLAY IS BLANK

• Check circuit breaker and reset if necessary.

• Make sure power switch at heating & cooling

system is on.

• Make sure furnace door is closed securely.

• If thermostat is battery powered, make sure fresh AA

alkaline batteries are correctly installed.

TEMPERATURE SETTINGS DO NOT CHANGE

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).

HEATING SYSTEM DOES NOT RESPOND

(“HEATING” APPEARS ON 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 heating

equipment to find the cause of the problem.

• Check for 24 VAC between the heat terminal (W)

and the transformer 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 the heating equipment.

TROUBLESHOOTING

COOLING SYSTEM DOES NOT RESPOND

(“COOLING” APPEARS ON 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 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.

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 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 12).

HEAT/COOL BOTH ON AT SAME TIME

• Check SW1 (Equipment Type), to make sure it is set

to match the installed heating/cooling equipment

(see page 11).

• Check to make sure heating and cooling wires are

not shorted together.

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 11).

“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.

22 23

SPECIFICATIONS

Electrical

Operating voltage 24 VAC (18 – 30 VAC)

Current Maximum: 2.5A (total), 1.0A (single 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

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)

SPECIFICATIONS

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)

24

P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357

www.aprilairepartners.com

61000893 12.11

B2205693A

Patent Pending

© 2011 Aprilaire – A division of Research Products Corporation