Honeywell RTH8500 User Manual

Operating Manual

RTH8500

Touchscreen Programmable Thermostat

Read and save these instructions

Need Help?

For assistance with this product please visit http://yourhome.honeywell.com

or call Honeywell Customer Care toll-free at 1-800-468-1502

BE CAREFUL! Never use sharp instruments, such as a pencil or pen, to press touchscreen keys. To prevent damage to the thermostat, always press keys with your fingertip.

® U.S. Registered Trademark.

US Patent No. 6,595,430 and other patents pending.

RTH8500

About your new thermostat

Thermostat features ..........................2

Programming at a glance..................3

Quick reference to controls ..............4

Quick reference to status display ....5

Programming & Operation

Clock setting ......................................6

Fan setting ........................................7

System setting....................................8

Using program schedules ................9

Program schedule overrides ..........12

Vacation hold ..................................14

Special features ..............................15

Screen cleaning ..............................16

Furnace filter reminder ....................17

Appendices

Battery replacement ........................18

In case of difficulty ..........................19

Limited warranty ..............................21

Table of contents

This thermostat is ready to go!

Your new thermostat is preprogrammed and ready to go. See page 3

to check settings.

CAUTION: EQUIPMENT DAMAGE HAZARD. To prevent possible

compressor damage, do not operate cooling system when outdoor temperature is below 50°F (10°C).

Operating Manual

About your new thermostat

Congratulations! You’ve just purchased the world’s most advanced, easyto-use thermostat. It has been designed to give you many years of reliable service and touchscreen climate control.

Features

• 7-day program schedules maximize comfort and economy.

• Armchair programming: Just pull thermostat from the wall to set schedules.

• EnergyStar

compliant to greatly reduce your heating/cooling expenses.

• One-touch temp control overrides program schedule at any time.

• Precise comfort control keeps temperature within 1°F of the level you set.

• Change/check reminders let you know when to replace filters and batteries.

• Large touchscreen display with backlight is easy to read — even in the dark.

RTH8500

This thermostat is ready to go!

Your new thermostat is pre-programmed and ready to go. All you have to do is set the time and day. Then check the settings below and change if needed:

1 Set clock......................................................................................See page 6

2 Select fan setting: Preset to Auto ........................To change, see page 7

3 Select system setting: Preset to Heat

..................To change, see page 8

4 Program schedules: Preset to energy-saving levels

while you’re at work or asleep (assumes you wake at 6 am, leave at 8 am, return at 6 pm

and go to bed at 10 pm) ..................................To change, see pages 10-13

ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and manually adjust the temperature (see pages 12-14).

MON TUE WED THU FRI SAT SUN

HEAT

SYSTEM

SCHED HOLD CLOCK SCREEN MORE

AUTO

FAN

OK TO PICK MULTIPLE DAYS

Inside

Set To

Following Schedule

6:01

Operating Manual

Quick reference to controls

Press day(s) to set program schedule (see page 11)

Press to select fan operation (see page 7)

Press to adjust temperature settings (see pages 11-14)

Press to set program schedule (see page 11)

Press to override program schedule (see pages 12-14)

Press to set clock (see page 6)

Press to lock keypad for 30 seconds to clean screen (see page 16).

Press to select system type (see page 8)

Press for more options (select models only)

WED

HEAT

SYSTEM

SCHED HOLD CLOCK SCREEN MORE

AUTO

FAN

Inside

Set To

Following Schedule

Recovery

6:01

RTH8500

Quick reference to status display

Current inside temperature Current day of week Temperature setting

System setting

Fan setting

Smart Response

Technology in effect (see page 15)

Program schedule on (does not display when off)

Current time

Other display messages:

• Cool On: Cooling system is activated

• Heat On: Heating system is activated

• Aux Heat On: Auxiliary heating system is activated (heat pump systems only)

Operating Manual

Clock setting

To set the current time display, press clock, then press or to adjust the time. Press and hold or to advance the time more quickly.

Press

DDOONNEE

to save & exit (or press

CCAANNCCEELL

to exit without changing

the time).

Note: The real-time clock should never require adjustment since it automatically updates for daylight savings time, and stores all date/time information.

Note: To change the current week day display, see System Setup in your Installation Guide.

Press

CCLLOOCCKK

Adjust time, then press

DDOONNEE

SCHED HOLD CLOCK SCREEN MORE

6:01

DONE CANCEL

6:02

RTH8500

Fan setting

Press

FFAANN

to select fan operation:

• On: Fan is always on.

• Auto: Fan runs only when the heating or cooling system is on.

WED

HEAT

SYSTEM

SCHED HOLD CLOCK SCREEN MORE

AUTO

FAN

Inside

Set To

Following Schedule

6:01

Press

FFAANN

Operating Manual

System setting

Press the

SSYYSSTTEEMM

button to select:

• Heat: Thermostat controls only the heating system.

• Cool: Thermostat controls only the cooling system.

• Auto: Thermostat automatically selects heating or cooling depending on the indoor temperature.

• Off: Heating and cooling systems are off.

• Em Heat (only for heat pumps with auxiliary heat): Thermostat controls Emergency and Auxiliary Heat. Compressor is locked out.

WED

HEAT

SYSTEM

SCHED HOLD CLOCK SCREEN MORE

AUTO

FAN

Inside

Set To

Following Schedule

6:01

Note: The Auto and Em Heat system settings may not appear, depending on how your thermostat was installed.

RTH8500

WAKE

6:00 am

LEAVE

8:00 am

RETURN

6:00 pm

SLEEP

10:00 pm

Set to the time you awaken and the temperature you want during the morning, until you leave for the day.

Set to the time you leave home and the temperature you want while you are away (usually an energy-saving level).

Set to the time you return home and the temperature you want during the evening, until bedtime.

Set to the time you go to bed and the temperature you want overnight (usually an energy-saving level).

Save money by setting program schedules

It’s easy to program your system for maximum energy savings. You can program four time periods each day, with different settings for weekdays and weekends.

Operating Manual

EnergyStar®settings for maximum cost savings

This thermostat is pre-set to use EnergyStar®program settings. We recommend these settings, since they can reduce your heating/cooling expenses by as much as 33%. (See next page to adjust times and temperatures of each time period.)

Heat (Mon-Fri) Cool (Mon-Fri) Heat (Sat-Sun) Cool (Sat-Sun)

Wake

(6:00 am)

Leave

(8:00 am)

Return

(6:00 pm)

Sleep

(10:00 pm)

[Or cancel period]

RTH8500

To adjust program schedules

1 Press

SSCCHHEEDD

, then

EEDDIITT

2 Press day buttons (

MMOONN--SSUUNN

) to select

day(s).

3 Press or to set Wake time for

selected day(s).

4 Press or to set Heat and Cool

temperature for this time period.

5 Press other time periods (

LLEEAAVVEE, RREETTUURRNN

SSLLEEEEPP

) to set time and temperatures

for each.

6 Press

DDOONNEE

to save & exit (or press

CCAANNCCEELL

to exit without saving changes).

Note: You can press

CCAANNCCEELL PPEERRIIOODD

to eliminate any

unwanted time period.

Press

SSCCHHEEDD

SCHED HOLD CLOCK SCREEN MORE

Press

EEDDIITT

Select day(s)

Set time for program period start

Set heat/cool levels

EDITDONE WAKE LEAVE RETURN SLEEP CANCEL

MON TUE WED THU FRI SAT SUN

HEAT

COOL

AUTO

FAN

OK TO PICK MULTIPLE DAYS

6:00

DONE WAKE LEAVE RETURN SLEEP CANCEL

CANCEL

PERIOD

WED

HEAT

SYSTEM

SCHED HOLD CLOCK SCREEN MORE

CANCEL

AUTO

FAN

Inside

Set To

Hold Temperature

Until

8:00

Operating Manual

Program schedule override (temporary)

Press or to immediately adjust the temperature. This will temporarily override the temperature setting for the current time period.

The new temperature will be maintained until the time you set. When the timer expires, the program schedule will resume and set the temperature to the level you’ve programmed for the current time period.

To cancel the temporary setting at any time, press

CCAANNCCEELL

(or

SSCCHHEEDD

). The program

schedule will resume.

Press

CCAANNCCEELL

(or

SSCCHHEEDD

) to

resume program schedule

Press to set timer

Adjust temperature

Heat On

RTH8500

Program schedule override (permanent)

Press

HHOOLLDD

to permanently adjust the temperature. This will turn off the program schedule.

Whatever temperature you set will be maintained 24 hours a day, until you manually change it, or press

CCAANNCCEELL

(or

SSCCHHEEDD

) to cancel “Hold” and resume the

program schedule.

WED

HEAT

SYSTEM

SCHED HOLD CLOCK SCREEN MORE

CANCEL

AUTO

FAN

Inside

Set To

Permanent

Hold

8:00

Press

CCAANNCCEELL

(or

SSCCHHEEDD

) to

resume program schedule

Press

HHOOLLDD

Adjust temperature

Heat On

+ 33 hidden pages