Honeywell Thermostat CT8602C User Manual

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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