Model 8476 Thermostat with
™
Event-Based Air Cleaning
Safety &
Installation
Instructions
READ AND SAVE THESE INSTRUCTIONS
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TABlE Of CONTENTS
INSTAllATION
INSTAllATION
INSTAllATION lOCATION RECOMMENDATIONS
Installation location recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Outdoor temperature sensor (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Thermostat mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Power & reset options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Wiring terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Thermostat should be mounted:
Do not mount thermostat:
• On an interior wall, in a frequently occupied space.
• Approximately 5‘ above floor.
• Behind doors, in corners, or other dead air spaces.
• In direct sunlight, near lighting fixtures, or other
appliances that give off heat.
• At least 18” from outside wall.
• On an outside or unconditioned area wall.
• Thermostat can be mounted to a vertical junction box.
• In the flow of a supply register, in stairwells, or near
outside doors.
SETUp & TESTINg
• On a wall with concealed pipes or ductwork.
System setup instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
System test mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
REfERENCES
Quick reference to controls & display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Thermostat features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
2
3
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INSTAllATION
INSTAllATION
OUTDOOR TEMpERATURE SENSOR (OpTIONAl)
THERMOSTAT MOUNTINg
pOwER & RESET OpTIONS
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.
• Install on side of building out of direct sunlight
(north side recommended).
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.
• Mount above snow line.
Heat pump applications can use the outdoor temperature
to effectively utilize the heat pump:
• Mount at least 3’ away from exhaust vents and
condensing lines.
24 VAC must be connected in order for the system fault
and emergency heat indicators to operate.
• 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.
• Maximum wire length is 300’.
The thermostat has a memory backup that saves the
thermostat’s settings in case of a power interruption.
• Do not route wires along 120 VAC lines.
• 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.
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.
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.
RC
R
W
Y
G
C
S1 S2 O/B
L
W2 Y2
6. Seal wire entry holes to prevent drafts affecting
temperature readings.
4
5
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INSTAllATION
INSTAllATION
wIRINg TERMINAl
wIRINg – SINglE TRANSfORMER (USE
JUMpER wIRE) fOR HEAT/COOl SYSTEM
wIRINg – TwO TRANSfORMERS (REMOVE
JUMpER wIRE) fOR HEAT/COOl SYSTEM
wire specifications
RC – 24 VAC supply cooling*
R – 24 VAC supply heating*
18-24 gauge thermostat wire
w – 1st stage heat / auxiliary
Y – 1st stage cooling / compressor
g – Fan
Installation notes
• Ensure power at the HVAC equipment is off.
C – Common (optional when powered by batteries)
S1 & S2 – outdoor temperature sensor (optional)
O/B – Reversing valve
• 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.
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).
RC
R
W
Y
G
C
S1 S2 O/B
L
W2 Y2
RC
R
W
Y
G
C
S1 S2 O/B
L
W2 Y2
RC
R
W
Y
G
C
S1 S2 O/B
L
W2 Y2
6
7
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INSTAllATION
SETUp & TESTINg
wIRINg – SINglE TRANSfORMER (USE
JUMpER wIRE) fOR HEAT pUMp SYSTEM
wIRINg – TwO TRANSfORMERS (REMOVE
JUMpER wIRE) fOR HEAT pUMp SYSTEM
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 based on other setting values.
How to enter the system setup menu to change
system settings
press
press
or
to change the setting.
to change to the next option.
press
repeatedly until system is set to OFF.
press
displayed.
after the last setting. “DONE” will be
press and hold
and
for three seconds.
The screen of the first setting 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.
SETTING VALUE
SYSTEM SETTING NUMBER
RC
R
W
Y
G
C
S1 S2 O/B
L
W2 Y2
RC
R
W
Y
G
C
S1 S2 O/B
L
W2 Y2
8
9
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SETUp & TESTINg
SETUp & TESTINg
SYSTEM SETUp INSTRUCTIONS (CONTINUED)
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.
System setting
Setting range, default in bold
0 : heat/cool
1 : heat pump
00 Equipment type (Set by Sw1)
0 : fahrenheit
1 : Celsius
01 Temperature scale
0 : gas or oil furnace (Equipment controls fan)
1 : Electric (Thermostat controls fan)
02 Fan control in heating
0° : No offset applied
–4°F to +4°F (–2°C to +2°C)
03 Offset temperature for internal sensor
04 Auto mode
Sw1
HEAT PUMP
HEAT/COOL
0 : Auto mode is disabled
1 : Auto mode is enabled
0 : No outdoor temperature sensor attached
1 : Outdoor temperature sensor attached
05 Outdoor temperature sensor
06 Compressor minimum off time
07 Heating minimum off time
08 Equipment minimum on time
5 minutes
1 to 5 minutes in 1 minute steps
2 minutes
1 to 5 minutes
2 minutes
1 to 5 minutes
10
11
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SETUp & TESTINg
SETUp & TESTINg
SYSTEM SETUp INSTRUCTIONS (CONTINUED)
SYSTEM SETUp INSTRUCTIONS (CONTINUED)
System setting
Setting range, default in bold
System setting
Setting range, default in bold
1°f (0.5°C)
1°F to 4°F (0.5°C to 2°C)
16 Low Balance Pt. (heat pump only)
20°f (–7°C)
1°F to 35°F (–17°C to 1°C) or “OFF” to disable
09 1st stage differential
System setting 05 must be enabled
1°f (0.5°C)
1°F to 4°F (0.5°C to 2°C)
17 High Balance Pt. (heat pump only)
60°f (16°C)
40°F to 80°F (4°C to 27°C) or “OFF “ to disable
10 2nd stage differential
System setting 05 must be enabled
1°f (0.5°C)
1°F to 4°F (0.5°C to 2°C)
0 – 5/2 program (weekdays and weekends)
1 – 5/1/1 program (Weekdays, Sat. and Sun.)
11 3rd stage differential (heat pump only)
12 Reverse valve (heat pump only)
19 Program format
20 Change air filter
0 – O/B energized in cooling (O)
1 – O/B energized in heating (B)
Off
1, 3, 6, 12 months or “OFF” to disable
13 Integral factor period (P+I control)*
4 minutes
1 to 5 minutes or “OFF” to disable
21 Change water panel**
Off
Set to OFF for proportional control only
Set number of months until reminder is required
1 to 12 months or “OFF” to disable
3°f (2°C)
2°F to 5°F (1°C to 3°C)
0 : flow through type humidifier (1 reminder per season)
1 : Drain-less type humidifier (2 reminders per season)
14 Deadband (auto mode)
15 Progressive recovery
22 Humidifier type**
0 : Progressive recovery is disabled
1 : progressive recovery is enabled
**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.
*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.)
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SETUp & TESTINg
SETUp & TESTINg
SYSTEM TEST MODE
SYSTEM TEST MODE (CONTINUED)
How to enter the system test menu
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.
press
output, press
to turn on the output (01). For multi stage
again to turn on the 2nd stage (02).
press
repeatedly until system is set to OFF.
press
press
to turn off the output (00).
press and hold
and
for three seconds.
to change to the next test step.
after the last test step. “DONE” will be
The screen of the first test step #50 is displayed:
press
The test steps are:
displayed.
Test Number
Heat/Cool
Heating (W) (W2)
Cooling (Y) (Y2)
Fan (G)
Heat pump
Aux Heating (W) (W2)
Compressor Cooling (Y) (Y2)
Compressor Heating (Y) (Y2)
Fan (G)
The thermostat will return to Normal mode if no button is
pressed in 3 seconds.
50
51
52
53
FLASHES IF 24VAC
SYSTEM TEST
IS NOT PRESENT
NUMBER
MODE (SW1 SETTING)
OUTPUT STATUS
14
15
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SETUp & TESTINg
SETUp & TESTINg
Test steps for Heat/Cool
Test steps for Heat pump
System Setting
#2
Display (Output)
System Setting
Display (Output)
01
02
01
02
01
fAN ON
(g)
01 AUX
HEATINg
ON (w)
ON
ON
ON
ON
02 AUX
01
02
01
Step
Key Input
Step
Key Input
HEATINg
ON (w)
HEATINg
ON (w2)
COOlINg
COOlINg
ON (Y2)
#2
#12
HEATINg COOl/HEAT COOl/HEAT fAN ON
O/B
ON (Y)
ON (w2)
ON (Y)
ON (Y2)
(g)
ON
ON
0 : Gas
1 : Elec
0 : Gas
1 : Elec
ON
ON
ON
ON
0 : Gas
1 : Elec
0 : Gas
1 : Elec
1st [UP]
2nd [UP]
1st [UP]
ON
ON
#50 Heat
ON
ON
#50 Aux
ON
ON
2nd [UP]
[DOWN]
1st [UP]
[DOWN]
1st [UP]
2nd [UP]
[DOWN]
[UP]
ON
ON
ON
ON
0 : O
1 : B
0 : O
1 : B
0 : O
1 : B
0 : O
1 : B
0 : O
1 : B
0 : O
1 : B
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
#51 Cool
ON
ON
ON
#51 Cool
2nd [UP]
[DOWN]
1st [UP]
2nd [UP]
[DOWN]
ON
#52 Fan
[DOWN]
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
#52 Heat
#53 Fan
[UP]
ON
[DOWN]
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QUICK REfERENCE TO CONTROlS & DISplAY
THERMOSTAT fEATURES
• Event-Based™ Air Cleaning.
CURRENT INDOOR TEMPERATURE
CURRENT TIME
OUTDOOR TEMPERATURE (OPTIONAL)
TEMPERATURE SETTING
• 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).
SYSTEM MODE
SETTING
EQUIPMENT STATUS
UP
CLEAN AIR
SETTING
• Front battery door access for fast, easy replacement.
• Built in compressor protection.
SYSTEM MODE
• Water panel and air filter service indicators.
DOWN
CLEAN AIR
• System test mode.
HOLD
PROGRAM
• Separately programmable weekday/weekend schedules.
• Easy to use temperature control can override program schedule at any time.
HEAT pUMp ONlY
Includes Event-Based™Air Cleaning
EMERGENCY HEAT (RED)
SYSTEM FAULT (YELLOW)
• 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.
INDICATOR SHOWS THROUGH HOUSING
QUICK REFERENCE CARD
BATTERY DOOR
CURRENT SCHEDULE PERIOD
MESSAGE CENTER
LOW BATTERY WARNING
NOTE: BACKLIGHT IS ACTIVATED WITH FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.
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TROUBlESHOOTINg
TROUBlESHOOTINg
DISplAY IS BlANK
HEATINg SYSTEM DOES NOT RESpOND
(“HEATINg” AppEARS ON SCREEN)
COOlINg SYSTEM DOES NOT RESpOND
(“COOlINg” AppEARS ON SCREEN)
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 circuit breaker and reset if necessary.
• 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 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.
• Make sure power switch at heating & cooling
system is on.
• Check to make sure heating and cooling wires are
not shorted together.
• Make sure furnace door is closed securely.
• If thermostat is battery powered, make sure fresh AA
alkaline batteries are correctly installed.
• 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 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.
HEATINg EQUIpMENT IS RUNNINg IN
COOl MODE
TEMpERATURE SETTINgS DO NOT CHANgE
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment
(see page 11).
• Check for loose or broken wires between the
thermostat and the cooling equipment.
• Check for loose or broken wires between the
thermostat and the heating equipment.
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).
fAN DOES NOT TURN ON IN A CAll fOR HEAT
“HEATINg” IS NOT DISplAYED
• Check System Setting #02 (Fan Control), to make
sure the fan control is properly set to match the type
of system (see page 11).
• Change the System Mode to Heat, and set
the temperature level above the current room
temperature.
HEAT pUMp ISSUES COOl AIR IN HEAT MODE,
OR wARM AIR IN COOl MODE
“COOlINg” IS NOT DISplAYED
• Change the System Mode to Cool, and set
the temperature level below the current room
temperature.
• Check System Setting #12 (Reversing Valve), to make
sure it is properly configured for your system (see
page 12).
20
21
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SpECIfICATIONS
SpECIfICATIONS
Environment
Thermal
Operating: 32° to 120°F (0° to 48.9°C)
Shipping: -30° to 140°F (-34.4° to 60°C)
Outdoor temperature sensor
Maximum distance: 300 feet
Display range: 32° to 99°F (0° to 40°C)
Display range: -20° to 130°F (-30° to 55°C)
Temperature
Room temperature measurement
Outdoor temperature measurement
Relative humidity
Operating: 5% to 90% R.H. (non-condensing)
Heat: 45° to 90°F (7° to 32°C)
Cool: 50° to 99°F (10° to 37°C)
Temperature setting range
Electrical
Operating voltage
Current
24 VAC (18 – 30 VAC)
Maximum: 2.5A (total), 1.0A (single output)
Maximum surge current: 5A
Dual power. Can be battery or 24 VAC powered.
Power supply
When both the sources are available, battery will be used as
back up power.
Battery power: AA size alkaline battery x 2
Battery life: Approximately 1 year
Battery power
22
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