Honeywell MagicStat 28 User manual

Form Number 69-0767B CT2800
Form Number 69-0767B CT2800
30%
28%
26%
24%
22%
20%
18%
16%
14%
12%
8%
6%
2%
10%
4%
Minneapolis
St. Paul
Montreal
Ottawa
Toronto
Buffalo
Cleveland
Milwaukee
Edmonton
Regina
Winnipeg
Calgary
Moncton
North Bay
Quebec
St. John's
Halifax Vancouver Denver
Des Moines
Omaha
Salt Lake
City
Boston
Chicago
Detroit
Pittsburgh
Indianapolis
Cincinnati
Kansas City
St. Louis
Columbus
New York
Philadelphia
Seattle
Louisville
Portland
Wash., D C
San
Francisco
Dallas
Atlanta
Los Angeles
Approximate percentage of energy cost savings
Savings for Once-A-Day
10°F [5°C] decrease
Savings for Twice-A-Day
10°F [5°C] decrease*
Savings for 5°F [3°]
summer increase
TYPICAL ENERGY SAVINGS FOR REPRESENTATIVE CITIES IN THE U.S. AND CANADA
*Based on 10°F [5°C] decrease—(5°F [3°C] decrease
gives approximately 55 percent of these savings).
M2416A
San Diego
G.H. 10-93 ©Honeywell Inc. 1993
Thermostat patents pending.
PROGRAMMABLE
THERMOSTAT
BY HONEYWELL
MagicStat
®
/28
Weekday/Weekend (5-day/2-day)
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac)
Thermostat and Mounting Plate
Model CT2800
10-93 •Printed in U.S.A. •69-0767B
PROGRAMMING AND INSTALLATION
INSTRUCTIONS

Table Of Contents
STEP 1 Prepare For Installation................................................................................................ 2
STEP 2 Remove Old Thermostat .............................................................................................. 4
STEP 3 Install The Batteries...................................................................................................... 6
STEP 4 Program The Thermostat ............................................................................................. 8
STEP 5 Adjust Fan Operation Switch, As Required ............................................................. 16
STEP 6 Adjust System On-Time, As Required ..................................................................... 16
STEP 7 Mount Thermostat Mounting Plate............................................................................ 18
STEP 8 Wire Thermostat Terminals ....................................................................................... 20
STEP 9 Mount The Thermostat ............................................................................................... 24
STEP 10 Check Thermostat Operation After Programming And Installing ........................ 25
STEP 11 Set The Fan And System Switches ......................................................................... 27
Troubleshooting Guide............................................................................................................ 29
Limited One-Year Warranty ..................................................................................................... 35
Welcome to the world of comfort and
energy savings with your new Honeywell
MagicStat®programmable thermostat.
Your new thermostat will automatically
control the temperature in your home, keeping
you comfortable while saving energy when
programmed according to the instructions in
this manual.
Direct any questions concerning the
application of this thermostat to Honeywell
Customer Assistance at 1-800-468-1502,
Monday-Friday 7:00 a.m.-5:30 p.m., Central
time.
RECYCLING THERMOSTAT
Typical
location of
a mercury
switch in a
thermostat.
If this thermostat is replacing a thermostat
that contains mercury in a sealed tube (see
illustration below), do
not place your old
thermostat in the trash. Contact your local
waste management authority for instructions
regarding recycling and the proper disposal
of your old thermostat.
If you have questions, call Honeywell
Inc. at 1-800-468-1502.
1
M3375
M3701
MERCURY
SWITCH

Table Of Contents
STEP 1 Prepare For Installation................................................................................................ 2
STEP 2 Remove Old Thermostat .............................................................................................. 4
STEP 3 Install The Batteries...................................................................................................... 6
STEP 4 Program The Thermostat ............................................................................................. 8
STEP 5 Adjust Fan Operation Switch, As Required ............................................................. 16
STEP 6 Adjust System On-Time, As Required ..................................................................... 16
STEP 7 Mount Thermostat Mounting Plate............................................................................ 18
STEP 8 Wire Thermostat Terminals ....................................................................................... 20
STEP 9 Mount The Thermostat ............................................................................................... 24
STEP 10 Check Thermostat Operation After Programming And Installing ........................ 25
STEP 11 Set The Fan And System Switches ......................................................................... 27
Troubleshooting Guide............................................................................................................ 29
Limited One-Year Warranty ..................................................................................................... 35
Welcome to the world of comfort and
energy savings with your new Honeywell
MagicStat®programmable thermostat.
Your new thermostat will automatically
control the temperature in your home, keeping
you comfortable while saving energy when
programmed according to the instructions in
this manual.
Direct any questions concerning the
application of this thermostat to Honeywell
Customer Assistance at 1-800-468-1502,
Monday-Friday 7:00 a.m.-5:30 p.m., Central
time.
RECYCLING THERMOSTAT
Typical
location of
a mercury
switch in a
thermostat.
If this thermostat is replacing a thermostat
that contains mercury in a sealed tube (see
illustration below), do
not place your old
thermostat in the trash. Contact your local
waste management authority for instructions
regarding recycling and the proper disposal
of your old thermostat.
If you have questions, call Honeywell
Inc. at 1-800-468-1502.
1
M3375
M3701
MERCURY
SWITCH

Prepare For Installation
■■Check Table 1 to make sure this thermostat is compatible with your system. If not, return to
retailer. For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.
TABLE 1—COMPATIBILITY CHART.
System Type Compatible With CT2800
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yes 1
Gas—Millivolt No
Oil-Fired Boilers Yes 1
Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditioning Yes
Baseboard Electric (120/240 Line Volt) No
Heat Pumps/Multistage Equipment No
Not compatible with any 120/240 volt circuit.
Compatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermo-
stats for zone valves. Not compatible with 2-wire White-Rodgers no.1361 valves.
Compatible with
hot water baseboard systems. Will not work efficiently on steam or
gravity systems.
STEP 1
2
2
1
2
2
■■Acquire tools and items below as needed. Also purchase two AA alkaline batteries; we
recommend Energizer batteries.
3
CROSS-RECESSED
SCREWDRIVER HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES
MASKING TAPE, IF
NEEDED TO LABEL WIRES
AS DISCONNECTED FROM
OLD THERMOSTAT
LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE M878A

Prepare For Installation
■■Check Table 1 to make sure this thermostat is compatible with your system. If not, return to
retailer. For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.
TABLE 1—COMPATIBILITY CHART.
System Type Compatible With CT2800
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yes 1
Gas—Millivolt No
Oil-Fired Boilers Yes 1
Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditioning Yes
Baseboard Electric (120/240 Line Volt) No
Heat Pumps/Multistage Equipment No
Not compatible with any 120/240 volt circuit.
Compatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermo-
stats for zone valves. Not compatible with 2-wire White-Rodgers no.1361 valves.
Compatible with
hot water baseboard systems. Will not work efficiently on steam or
gravity systems.
STEP 1
2
2
1
2
2
■■Acquire tools and items below as needed. Also purchase two AA alkaline batteries; we
recommend Energizer batteries.
3
CROSS-RECESSED
SCREWDRIVER HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES
MASKING TAPE, IF
NEEDED TO LABEL WIRES
AS DISCONNECTED FROM
OLD THERMOSTAT
LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE M878A

or multistage system. The thermostat is
not compatible with such systems so return
the product to the place of purchase. If you
would like information about which program-
mable thermostats will work with your system,
call Honeywell Customer Assistance at
1-800-468-1502.
Three thermostat wires?
If you have three wires for heating only and
can operate the fan using the fan ON switch,
this thermostat will work with your system.
However, some hot water (zoned) heating
systems have three thermostat wires. The
thermostat will not work without installing an
isolating relay on these systems. For details,
call Honeywell Customer Assistance at 1-800-
468-1502.
Replacing a Clock Thermostat that has C
or C1 Clock Terminals?
If you are replacing a Honeywell
Chronotherm®Thermostat, you may find one
or two wires that go to the C or C1 clock
terminals on the Chronotherm Thermostat
wiring wallplate. Do not allow them to touch,
or you may damage your transformer.
Disconnect the wires and wrap them sepa-
rately, using electrical tape.
Do not wrap them
together
. Place the wires where they will not
interfere with the operation of the new
thermostat. Record the colors and terminal
designation labels of the remaining wires.
Six or more wires?
If there are six or more wires (excluding
clock wires attached to terminals), you
most likely have a variation of a heat pump
4
Remove Old Thermostat
STEP 2
■■Test to make certain that your heating
and cooling systems are working properly. If
either does not work, contact your local
heating/air conditioning dealer. To avoid
compressor damage, do not operate the
cooling system when outdoor temperature is
below 50°F [10°C].
■■TURN OFF POWER to system at the
furnace, or at the fuse/circuit breaker panel.
■■Carefully unpack your new thermostat and
mounting plate; save the package of screws,
instructions and receipt.
■■Remove cover from old thermostat. If it
does not snap off when pulled firmly from the
bottom, check for a screw used to lock on the
cover.
■■Loosen screws holding thermostat to
subbase, wallplate or wall, and lift away.
■■Disconnect wires from old thermostat or
subbase. As you disconnect each wire, use
masking tape to label it with the old terminal
designation. If there are only two wires, they
do not need to be labeled. If there is an extra
wire that is not connected to your old thermo-
stat, you will
also not be connecting it to your
new thermostat. Keep the wires from falling
back into the wall by wrapping them around a
pencil as shown.
WIRES THROUGH
WALL OPENING
M5136
5

or multistage system. The thermostat is
not compatible with such systems so return
the product to the place of purchase. If you
would like information about which program-
mable thermostats will work with your system,
call Honeywell Customer Assistance at
1-800-468-1502.
Three thermostat wires?
If you have three wires for heating only and
can operate the fan using the fan ON switch,
this thermostat will work with your system.
However, some hot water (zoned) heating
systems have three thermostat wires. The
thermostat will not work without installing an
isolating relay on these systems. For details,
call Honeywell Customer Assistance at 1-800-
468-1502.
Replacing a Clock Thermostat that has C
or C1 Clock Terminals?
If you are replacing a Honeywell
Chronotherm®Thermostat, you may find one
or two wires that go to the C or C1 clock
terminals on the Chronotherm Thermostat
wiring wallplate. Do not allow them to touch,
or you may damage your transformer.
Disconnect the wires and wrap them sepa-
rately, using electrical tape.
Do not wrap them
together
. Place the wires where they will not
interfere with the operation of the new
thermostat. Record the colors and terminal
designation labels of the remaining wires.
Six or more wires?
If there are six or more wires (excluding
clock wires attached to terminals), you
most likely have a variation of a heat pump
4
Remove Old Thermostat
STEP 2
■■Test to make certain that your heating
and cooling systems are working properly. If
either does not work, contact your local
heating/air conditioning dealer. To avoid
compressor damage, do not operate the
cooling system when outdoor temperature is
below 50°F [10°C].
■■TURN OFF POWER to system at the
furnace, or at the fuse/circuit breaker panel.
■■Carefully unpack your new thermostat and
mounting plate; save the package of screws,
instructions and receipt.
■■Remove cover from old thermostat. If it
does not snap off when pulled firmly from the
bottom, check for a screw used to lock on the
cover.
■■Loosen screws holding thermostat to
subbase, wallplate or wall, and lift away.
■■Disconnect wires from old thermostat or
subbase. As you disconnect each wire, use
masking tape to label it with the old terminal
designation. If there are only two wires, they
do not need to be labeled. If there is an extra
wire that is not connected to your old thermo-
stat, you will
also not be connecting it to your
new thermostat. Keep the wires from falling
back into the wall by wrapping them around a
pencil as shown.
WIRES THROUGH
WALL OPENING
M5136
5

20 to 30 seconds of removing the old ones,
you will not have to reprogram the thermostat.
However, if the display is blank, the batteries
are dead or incorrectly installed and you will
have to reprogram. See pages 12 to 13 to
reprogram.
IMPORTANT
Although the thermostat has a low battery
indicator, replace the batteries once a year
to prevent the thermostat and heating/
cooling system from shutting down due to
lack of battery power.
As a precaution, when leaving home for
longer than a month, change batteries before
you leave to prevent system from shutting
down due to lack of battery power.
flashing. “bAt Lo”will stay on without flashing,
indicating the thermostat and heating/cooling
system have stopped working and the
batteries are almost completely dead.
After the batteries are completely dead, the
“bAt Lo”indicator will disappear, leaving a
completely blank display.
Press down on left ends of batteries to
remove. If you insert the new batteries within
STEP 3
As the batteries are running low, a “bAt Lo”
indicator will flash for 1 to 2 months before
batteries run out completely. Replace the
batteries as soon as possible after the indica-
tor starts flashing. If you do not replace the
batteries sometime during the flashing
“bAt Lo,”the indicator will eventually stop
Install The Batteries
IMPORTANT
Batteries must be installed for programming
and operation of the thermostat and heating/
cooling system.
■■Purchase two AA alkaline batteries; non-
alkaline batteries will not last as long, and may
leak, causing damage to thermostat or wall
surface. We recommend Energizer batteries.
■■Make sure the thermostat is set in the OFF
position.
■■Use a coin to remove battery door.
■■Install the fresh batteries as shown,
making sure positive and negative terminals
are oriented correctly.
■■Replace battery door.
6
M3631
REMOVING
BATTERY
DOOR
AutoOn
Fan
Cool OffHeat
System
Run
Program
Hold
Temp
Clock/Day
Schedule
SetTimeTempMode
7
INSTALL TWO AA ALKALINE
BATTERIES AS SHOWN
M3668
Auto On
Fan
Cool Off Heat
System
Run
Program
Hold
Temp
Clock/Day
Schedule
Set Time Temp Mode

20 to 30 seconds of removing the old ones,
you will not have to reprogram the thermostat.
However, if the display is blank, the batteries
are dead or incorrectly installed and you will
have to reprogram. See pages 12 to 13 to
reprogram.
IMPORTANT
Although the thermostat has a low battery
indicator, replace the batteries once a year
to prevent the thermostat and heating/
cooling system from shutting down due to
lack of battery power.
As a precaution, when leaving home for
longer than a month, change batteries before
you leave to prevent system from shutting
down due to lack of battery power.
flashing. “bAt Lo”will stay on without flashing,
indicating the thermostat and heating/cooling
system have stopped working and the
batteries are almost completely dead.
After the batteries are completely dead, the
“bAt Lo”indicator will disappear, leaving a
completely blank display.
Press down on left ends of batteries to
remove. If you insert the new batteries within
STEP 3
As the batteries are running low, a “bAt Lo”
indicator will flash for 1 to 2 months before
batteries run out completely. Replace the
batteries as soon as possible after the indica-
tor starts flashing. If you do not replace the
batteries sometime during the flashing
“bAt Lo,”the indicator will eventually stop
Install The Batteries
IMPORTANT
Batteries must be installed for programming
and operation of the thermostat and heating/
cooling system.
■■Purchase two AA alkaline batteries; non-
alkaline batteries will not last as long, and may
leak, causing damage to thermostat or wall
surface. We recommend Energizer batteries.
■■Make sure the thermostat is set in the OFF
position.
■■Use a coin to remove battery door.
■■Install the fresh batteries as shown,
making sure positive and negative terminals
are oriented correctly.
■■Replace battery door.
6
M3631
REMOVING
BATTERY
DOOR
AutoOn
Fan
Cool OffHeat
System
Run
Program
Hold
Temp
Clock/Day
Schedule
SetTimeTempMode
7
INSTALL TWO AA ALKALINE
BATTERIES AS SHOWN
M3668
Auto On
Fan
Cool Off Heat
System
Run
Program
Hold
Temp
Clock/Day
Schedule
Set Time Temp Mode

Also, you do not need to enter a time and
temperature program for all periods if your
schedule does not require it. For example, a
house that is occupied during weekdays would
only require programs for “WAKE”and
“SLEEP.”
If no program is entered for the weekends,
the thermostat will operate on the weekday
"SLEEP" program all weekend.
When pressing the keys, use the ball of
your finger or a soft pencil eraser. Use of
sharp fingernails or pencil points may damage
the keypad.
If you make an error at any time during
programming, just press the RUN PROGRAM
key, and continue again at the step where you
left off.
“SLEEP”is the time period you can set for
an energy-saving temperature while you are
sleeping. (Again, lower heat or higher cool.
For more comfortable sleeping, some
people choose not to raise the cool tem-
perature during the night.)
You will set one schedule for weekdays
and another for weekends, because your
requirements will probably be different for
each. Also, during weekends only the “WAKE”
and “SLEEP”time periods are available.
Fill in the times and temperatures you
desire for weekdays and weekends. If you
decide not to program the thermostat, it will
automatically control heating at 68°F [20°C],
and cooling at 78°F [26°C], 24 hours a day.
STEP 4
Program The Thermostat
After the batteries are installed, the
thermostat can be easily programmed in your
hand before it is installed on the wall.
If you would prefer to program the thermo-
stat after it is installed on the wall, skip to page
16, and return later to this programming
section.
The following personal programming chart
(pages 10 to 11) may be helpful for planning
your program schedule of time and tempera-
ture settings for various times of the day.
Four time periods are available during
weekdays—“WAKE,”“LEAVE,”“RETURN,”
and “SLEEP.”These periods can be seen
individually on the display as you press the
SET SCHEDULE key.
“WAKE”is the time period you want the
house at a comfortable temperature when
you get up and while you get ready for
work or school. (This will be a higher
temperature during heating season, or a
lower temperature during cooling season.)
“LEAVE”is the time period you can set for
an energy-saving temperature while you are
away at work or school. (This will be a lower
temperature during heating season, or a
higher temperature during cooling season.)
“RETURN”is the time period you want the
house at a comfortable temperature for
activities before bedtime. (Again, higher
heat or lower cool.)
8
9
PROGRAMMING