Honeywell T8621, T8611 User Manual

Your new Honeywell Chronotherm III

Fuel Saver Thermostat is a precision
instrument that’s quality-built to give
you many years of satisfactory
service. Each day of the week can be
programmed independently so that,
regardless of your schedule, you’ll
save fuel while automatically
maintaining the standard of comfort
you require.

This User’s Guide will show you how
to get the most benefit from your new
thermostat.

Programming Your Thermostat

Enter the day and time

Set

the program times and

temperatures for

Copy

the program to the desired days

Set

the program times and temperatures

for the

remaining

Set the system and fan switches

on the subbase

Operating Your Thermostat

Temporarily changing the program
Permanently changing the program
Operating the thermostat manually
Canceling program settings
Checking the program times and

temperatures

one day

days

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11

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17

19-26

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Checking the current temperature setting

1

Maintaining Your Thermostat

2

Removing the thermostat
Replacing the thermostat
Replacing the batteries

Power outages
Glossary
Your Daily Program
Model Identification Guide
Troubleshooting Guide
Quick Reference to the Keys
Index
Warranty

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27-30

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31-32
33-34
35-36
37-38

39-40

41-42

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I

STEP 1

ENTER THE DAY AND TIME
You

can program this thermostai
either on the wall or in your
hand. SEE PAGE 27 TO FIND
OUT HOW TO REMOVE THE
THERMOSTAT FROM THE
WALL

Always press the keys with
fingertip or similar blunt tool.
Sharp instruments like a pen or
pencil point can damage the
keyboard.

your

SET

PRESENT

DAY/TIME

0

TIME

A,

ml

:’

El

Press and release. The display
shows 1:00 PM Mon.

Press and hold until the current

day appears in the display.

Press and hold until the current
time appears in the display. Be
sure AM or PM appears as
desired.

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[-7$X-=]

NOTE: Check the glossary, page

31, for definitions of unfamiliar
words.

STEP 2

SET THE PROGRAM TIMES
AND TEMPERATURES FOR
ONE DAY

Before You Begin. .

The schedule form on page 33
provides an opportunity to plan
your daily program.

Now. .
Choose a day to program first.
We’ll use Monday in the exam­ples, but you can start with any
day. Start by programming the
MORNING time and tempera­tures. The thermostat requires a
MORNING program every day.
You can set additional programs
as desired.

.

.

- ‘..

m¶

I

You have set the current day and
time. Go on to Step 2.

Press and release. Note that the
display shows MORNING and
the preprogrammed time and
temperature.

If the display reads COOL, press
and release to switch to HEAT.

Press and hold until MONDAY

(or the desired day) appears in
the display.

Press and hold until the
shows the time you want the
temperature at the comfort
setting.

display

1

00 -

ml

Press and hold until the display
shows the desired heating

temperature.

If the display flashes while you
are holding down TEMPERA­TURE WARMER or COOLER,
you have reached the setting

limit. If your thermostat can

switch automatically between
heating and cooling, the heating
temperature must be at least 3
degrees below the air condition-

ing temperature. For example, if
the cooling setting is

maximum heating setting is 72”

F. To set a higher heating
temperature, you must first raise
the cooling setting.

75’

F, the

Program the MIDDAY time and
heating temperature if desired.

NOTE: You can cancel any

period showing on the display
except MORNING by pushing
the the CANCEL
To move to the next period
while programming, simply
press the PERIOD key again.

PERiOD

key.

ml

’ ”

Press and release. The display
shows MIDDAY, but no time or
temperature.

Press and hold until the display

shows the time you want room
temperature to start drifting
toward the energy saving setting.

Press and hold until the display
shows the desired temperature.

4

Program the EVENING time and

temperature, if desired.

Press and release. The display
shows EVENING, but no time or
temperature.

Press and hold until the display

shows the time you want the
temperature to be at the comfort
setting.

Press and hold until the display

shows the desired heating
temperature.

5

Program the NIGHT time and

temperature, if desired.

Press and release. The display

shows NIGHT and the prepro­grammed time and temperature.

Press and hold until the display
shows the time you want the
temperature to start drifting
toward the energy saving setting.

Press and hold until the display

shows the desired heating
temperature.

6

Set the cooling temperatures for
all the periods you’ve
programmed.

Press and release. The display
shows COOL, the prepro­grammed cooling temperature
and the programmed start time
for NIGHT.

7

Press and hold until the display
shows the desired cooling

temperature for NIGHT.

If the display blinks while you are
holding down TEMPERATURE
WARMER or COOLER, you have

reached the setting limit. If your
thermostat can switch automatic­ally between heating and cooling,
the heating temperature must be
at least 3 degrees below the air

conditioning temperature. For
example, if the heating setting is

72’

F, the minimum cooling set-

ting is

75’

F. To set the cooling

temperature lower, you must first

lower the heating setting.

8

Press and release. The display
shows the preprogrammed cool­ing temperature and the pro­grammed start time for

MORNING.

Press and hold until the display
shows the desired cooling
temperature for MORNING.

= -..

m¶

Press and release. The display

shows the preprogrammed cool-

ing temperature and the pro-

grammed start time for MIDDAY.

Press and hold until the display

shows the desired cooling

temperature for MIDDAY.

Press and release. The display
shows the preprogrammed cool­ing temperature and the pro­grammed start time for EVENING.

Press and hold until the display
shows the desired cooling
temperature for EVENING.

You have completed setting the
program schedule for one day.
Go to Step 3 to copy this pro­gram to additional days.

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STEP 3

COPY THE PROGRAM TO THE
DESIRED DAYS

You

can copy one day’s program
to any other day or combination
of days. The new program will
replace any program already set
in the day selected.

If necessary, press and release

to enter the programming mode.

Press and hold until the day
containing the program to be
copied shows in the display.

Press and release. The day to be
copied will show, and the next
day will flash, in the display.

Press and release if you wish to
copy the program into the day
that’s flashing in the display. Note
that the next day now starts to
flash.

Press and release if you don’t
wish to copy into the day that’s
flashing. Note that the next day
now starts to flash.

NOTE: The display will show

32” F instead of the current
temperature until the thermo­stat is mounted on the sub­base and the system is
powered.

Press and release the COPY TO
key again to select the day that’s
flashing, or the DAY key to by­pass it.

Continue until all desired days
are showing in the display and

are not flashing.

Press and release to copy the
program into all the days you
have selected.

12

STEP 4

SET THE SCHEDULES AND
TEMPERATURES FOR THE

REMAINING DAYS

Use the procedures described in
Steps 2 and 3 and summarized
in this step to program the
remaining days.

Press and release to enter the

programming mode.
Press and hold until the day you

wish to program shows on the
display.

If COOL shows on the display,
press and release to switch to
HEAT.

Use the AHEAD/BACK keys to
set the time and the
WARMER/COOLER keys to set
the heating temperature.

Press and release the PERIOD

key to step through the remain-

ing time periods. Use the

AHEAD/BACK keys to set the

_.

time and the WARMER/COOLER

keys to set the heating tempera-

ture for each time period.

13

Press and release so COOL

shows on the display.

Press and release the PERIOD

key to step through the time
periods, and use the WARMER/
COOLER keys to set the cooling
temperature for each period.

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