CT8602C
Professional Fuel Saver Thermostat
Do not install the thermostat where it may be affected by:
Application
— drafts or dead spots behind doors, in corners, or under
cabinets.
This thermostat provides energy saving control for a
— hot or cold air from ducts.
24 Vac gas, oil, or electric heating or heating/cooling
— radiant heat from sun or appliances.
system with independently controlled fan. System switch
— concealed pipes and chimneys.
positions include HEAT-OFF-COOL: fan switch positions
— unheated (uncooled) areas such as an outside wall,
include ON-AUTO.
behind the thermostat.
Power is supplied for the device by three AA alkaline
batteries (included in package). This allows the thermostat
to be compatible with all control applications.
Heat and cool anticipation is fixed; no adjustment is
necessary. Cycle rates are adjustable for heating.
IF REPLACING AN EXISTING THERMOSTAT
Turn off power to thermostat at furnace or boiler. A two-
transformer system may require turning off two switches or
disconnects. Remove any existing wallplate or subbase
from wall. To avoid miswiring later, label or write down
The current rating is 1.6A maximum up to 30 Vac.
each wire with the letter or number on the wiring terminal
as the wire is removed.
Recycling Notice
IF NEW INSTALLATION
Run cable to the hole in the selected wall location, and
pull about 3 in. (76 mm) of wire through the opening.
Color-coded, 18 gauge thermostat cable with at least one
conductor for each wiring terminal is recommended.
If this control is replacing a control that contains mer-
cury in a sealed tube, do not place your old control in the
trash. Contact your local waste management authority for
instructions regarding recycling and the proper disposal of
your old control.
If you have any questions, call Honeywell Inc. at 1-800-
468-1502.
MOUNTING WALLPLATE
Remove thermostat from wallplate (Fig. 1).
The wallplate does not require leveling for operation,
but only for appearance. The wallplate mounts directly
onto the wall with the screws included in the package. Use
the wallplate as a template, and with a pencil, mark two
Installation
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.
2. Check the ratings given on the product to make sure
the product is suitable for your application.
3. After installation is complete, check out product
operation as provided in these instructions.
4. Allow thermostat to warm to room temperature
before operating.
mounting screw positions that best fit the application using
two of the three mounting holes in the wallplate (Fig. 2).
Use 3/16 in. bit to drill holes for anchors. Gently tap
anchors into holes until flush with the wall surface. Thread
wires through the center opening of the wallplate. Then
mount the wallplate using the two screws provided. Gently
tighten screws, level top surface of wallplate, and securely
tighten the screws.
Fig. 1—Removing thermostat from wallplate.
CAUTION
Disconnect power supply to prevent electrical
shock or equipment damage.
IMPORTANT: Push excess wire back into the hole, and
plug the hole with non hardening caulk, putty or
insulation to prevent drafts from affecting thermo-
stat operation.
LOCATION
Install thermostat and wallplate about 5 ft. (1.5m)
above the floor in an area with good air circulation at
room temperature.
M8850
• ©Honeywell Inc. 1995 • Form Number 69-0446—2
S. M. • Rev. 3-95 •
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Fig. 7—CT8602C heating/cooling circuit in a two
transformer (one for heating, one for cooling)
system with gas heat and electric cooling, RC
and R terminals. Remove factory-installed R-RC
Setting and Adjustments
ADJUSTING CYCLE RATE
jumper.
NOTE: MOST APPLICATIONS DO NOT REQUIRE A
CHANGE IN CYCLE RATE.
WALLPLATE
The room air temperature varies slightly from the com-
fort temperature setting with the cycling of the furnace or
air conditioner. The equipment cycles off and on as the
room temperature approaches the setpoint.
The cycle rate of this thermostat is set for heating at six
cycles per hour and for cooling at three cycles per hour as
shipped from the factory. The cooling cycle rate cannot be
adjusted. The heating cycle rate can be adjusted by turning
one or both cycle rate adjustment screws located on the
back of the thermostat. See Fig. 9. Back out the screw about
one-half to one turn, or turn in until tight.
G
R
RC
W
Y
1
L1
(HOT)
L2
24V
FAN RELAY
2
COOLING
CONTACTOR
HEATING
PRIMARY
CONTROL
L1
HOT
L2
1
(
)
24V
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
PRIMARY CONTROL SUCH AS GAS VALVE OR
ELECTRONIC IGNITION MODULE.
ADAPTIVE INTELLIGENT RECOVERY™/
CONVENTIONAL RECOVERY
M118
The thermostat is factory-set for Adaptive Intelligent
Recovery™, but can be converted to conventional recovery
using screw 3A on the back of the thermostat as indicated in
Fig. 9.
With Adaptive Intelligent Recovery™, the room reaches
the comfort temperature at the exact time programmed into
the thermostat. The control temperature increases gradu-
ally, and turns the equipment on and off several times to
reach the comfort temperature slowly and on time. There is
nowastedenergyassociatedwithrapidtemperaturechanges
and temperature overshoot.
Fig. 8—CT8602C heating/cooling circuit in an oil
heating and electric cooling system. Heating
transformer is in oil primary, RC and R termi-
nals. Remove factory-installed R-RC jumper.
WALLPLATE
G
R
RC
W
Y
1
L1
HOT
(
)
With conventional recovery, program the start time to
be earlier than the desired comfort time. It may require
some trial and error to arrive at the best starting time.
FAN RELAY
T
T
COOLING
L2
CONTACTOR
OIL PRIMARY
L1
NOTE: If you adjust screw 3A for conventional recovery, an
indicator appears in the lower right corner of the thermo-
stat display as a reminder that the Adaptive Intelligent
Recovery™ feature is not active. (Fig. 10).
1
(
HOT
)
24V
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M120
Fig. 9—Adjustments.
Fig. 10—Conventional recovery indicator.
RECOVERY
SELECTION
3A
IN
ADAPTIVE
INTELLIGENT ™
(FACTORY SETTING)
SET
PT
PM
OUT 1/2 TO 1 TURN
CONVENTIONAL
TUE
LEAVE
INDICATES
THERMOSTAT IS SET FOR
CONVENTIONAL RECOVERY
M8878
3A 1A 1B
2A 2B
SETTING TIME/TEMPERATURE
The display readout can be converted between a 12 and
24 hour clock or °C and °F using screws 2A and 2B as
indicated in Fig. 9.
INSTALLING BATTERIES
TIME/TEMP
DISPLAY
Power is supplied for the thermostat by three AA alka-
line batteries. Batteries are included with thermostat. Install
batteries in back of thermostat as shown in Fig. 11. The
display will flash 1:00 PM and room temperature.
When the batteries are going dead, the display will flash
REPL BAT. Set system switch to OFF. Remove the ther-
mostat from the wall and install three new AA alkaline
batteries. We recommend Energizer® batteries. Change
SYSTEM
1A
1B
2A
IN
2B
OUT 1/2
OUT 1/2
GRAVITY
AIR/WATER
24 HR
TO 1 TURN TO 1 TURN
OUT 1/2
TO 1 TURN
HOT
WATER
IN
OUT 1/2
TO 1 TURN
12 HR
IN
IN
GAS/OIL
WARM AIR
o
(FACTORY SETTING)
C
IN
ELECTRIC
WARM AIR
OUT 1/2
TO 1 TURN
IN
OUT 1/2
TO 1 TURN
o
F
M8857
3
69-0446—2
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batteries within approximately 30 seconds from the time
the batteries are removed to prevent program loss and
reprogramming.
MOUNTING THE THERMOSTAT
Hang the thermostat on the tabs at the top of the base
(Fig. 12a). Swing down and press on lower edge until
thermostat snaps into place (Fig. 12b). Open the cover, and
tighten the captive mounting screws (Fig. 12c).
IMPORTANT: The low battery warning displays about
two months before the batteries are dead. When the
batteries are dead, the system shuts down. After bat-
teries are replaced, thermostat requires reprogram-
ming.
SETTING DAY AND TIME
Set present day and time. When the thermostat is first
turned on, the display will read 1:00 PM and room tempera-
ture. It will go off for a few seconds, then begin to flash on
and off.
Fig. 11—Battery placement.
SET
PRESENT
Press
.
DAY/TIME
BACK
Press TIME
or
to set the current time.
AHEAD
SET
PRESENT
DAY/TIME
Press
.
Press
to set the current day. Each press of the
DAY
DAY KEY advances the display one day.
If the display does not come on:
• Check mounting of thermostat to wallplate. If loose or
misaligned, remove thermostat and reinstall on
wallplate, making sure it is firmly attached.
• Check to see that all the batteries are good and in-
stalled correctly.
BATTERY
PLACEMENT
(NOTE CORRECT PLUS
AND MINUS DIRECTION)
M2083
Fig. 12—Mounting thermostat on wallplate.
A.
B.
PM
MON
RETURN
HEAT ON
PM
C.
MON
HEAT ON
RETURN
TEMPERATURE
RUN
PROGRAM
PRESENT
SETTING
TIME
SET
SKIP
NEXT
PRESENT
DAY
LEAVE
WAKE
SLEEP
AHEAD
WARMER
COOLER
DAY/TIME
PERIOD
HOLD
MP
SET
HEAT/COOL
CHANGE
TO LAST
PERIOD
BACK
RETURN
M8849
69-0446—2
4
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FAN
Move the system switch to OFF, and the fan switch to
ON. The fan should run continuously. When the fan switch
is in the AUTO position, the fan cycles with the heating or
cooling system.
Checkout
HEATING
Move the system switch to HEAT and the fan switch to
AUTO. Press WARMER key until the setting is about 10°F
(6°C) above room temperature. Heating should start and
the fan should run after a short delay. Press COOLER key
until the setting is about 10°F (6°C) below room tempera-
ture. The heating equipment should shut off.
INSTALLER SELF-TEST (Optional)
Perform the following test as a check of all thermostat
functions. If thermostat does not respond as indicated,
replace thermostat.
1. Press AHEAD and BACK keys at the same time.
while holding down keys, all segments of the display should
be on (see Fig. 13).
COOLING
CAUTION
Do not operate cooling if outdoor temperature is
below 50°F (10°C). Refer to manufacturer’s rec-
ommendations.
Fig. 13—All segments on display.
REPL
AM
SET
PT
BAT
PM
NOTE: When cooling setting is changed, thermostat will
wait up to five minutes before turning on the air condi-
tioner. This delay protects the compressor.
SUN MON TUE WED THU FRI SAT COOL ON HEAT ON
WAKE LEAVE RETURN SLEEP TEMPORARY
M8856
Move the system switch to COOL and the fan switch to
AUTO. Press COOLER key until the setting is about 10°F
(6°C) below room temperature. The cooling equipment and
fan should start. Press WARMER key until the setting is
about 10°F (6°C) above room temperature. The cooling
equipment and fan should stop.
2. Set system switch to OFF. Press AHEAD and BACK
and PRESENT SETTING keys at the same time to enter
self-test.
3. Press each key as listed on next page, and look for
response listed as key is held down and released.
5
69-0446—2
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Look For This Response
First
Digit
Cycle Rate Setting
(cph at 50% On Time)
System
Switch
Position
Press
This
Key
CHANGE
TO LAST
PERIOD
Key Key
Down Released
0 or 1
2 or 3
4 or 5
6 or 7
1
3
9
6
OFF
03
07
15
15
Blank
Blank
Blank
SKIP
NEXT
PERIOD
PRESENT
SETTING
PRESENT
SETTING
COOL (with
fan in
AUTO)
Cooling and fan
on.
Second Clock
Digit
Recovery
(hr)
Degrees
Setting
Conventional
Conventional
0
1
2
12
F
C
F
PRESENT
SETTING
15
Colling and fan
off.
12
12
Adaptive Intelligent
Recovery™
OFF
06
02
05
04
01
00
12
Blank
WARMER
COOLER
Blank
3
12
C
Adaptive Intelligent
Recovery™
Blank
AHEAD
BACK
4
5
6
24
24
24
F
C
F
Conventional
Conventional
Blank
Adaptive Intelligent
Recovery™
Blank
LEAVE
Blank
RETURN
7
24
C
Adaptive Intelligent
Recovery™
(CHECK
EACH
POSITION)
See note A
WAKE
▼
▼
OFF
08
13
Blank
SLEEP
DAY
▼ ▼
Microprocessor
mask no. and
revision no.
Third Digit
System Switch Position
SET
HEAT/COOL
09
14
14
14
10
11
Blank
0
2
4
OFF
SET
PRESENT
DAY/TIME
Blank
COOL
HEAT
SET
PRESENT
DAY/TIME
HEAT
Heating on.
Heating off.
Blank
SET
PRESENT
DAY/TIME
1
▲
Fourth Digit
System Switch Position
HOLD
TEMP
OFF
0
1
4
5
Any position
RUN
PROGRAM
Normal operating
display.
HEAT, OFF, or COOL
Any position
END SELF-TEST
1
▲
A HEAT displayed when system switch is in HEAT,
COOL when in COOL, neither when in OFF. A four-
digit code is displayed with each digit explained as
follows.
HEAT, OFF, or COOL
For electric heat fan operation, the fan operates with
the heating system when the fan switch is in AUTO.
Allow thermostat to reach room temperature before pro-
gramming. Then refer to owner’s manual for programming
instructions and homeowner troubleshooting.
This equipment is a Class B digital apparatus which complies with Canadian Radio Interference Regulations, CRC c. 1374.
Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Home and Building Control
Honeywell Limited—Honeywell Limitée
740 Ellesmere Road
Helping You Control Your World
Scarborough, Ontario
M1P 2V9
QUALITY IS KEY
Printed in U.S.A.
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