CT1800, CT1801, CT1802
Electromechanical Fuel SaverThermostat and Wallplate/Subbase
Installation Instructions
CT1800 24V gas or oil heat, or 3 wire zone valves.
CT1801 24V gas or oil heat/cool.
CT1802 24V central electric heat/cool or single stage
heat pump without auxiliary heat.
Not for use on line voltage (120V) millivolt systems.
Recycling Notice
Contact your local waste management authority for
This control contains mercury in a sealed tube. Do not
place control in the trash at the end of its useful life.
instructions regarding recycling and the proper disposal of
this control, or of an old control containing mercury in a
sealed tube.
If this control is replacing a control that contains mercury in
a sealed tube, do not place your old control in the trash.
THERMOSTAT FEATURES
I—Front of thermostat.
LOW TEMPERATURE
CONTROL LEVER (BLUE)
HIGH TEMPERATURE
CONTROL LEVER
(RED)
M9613
THERMOSTAT COVER
THERMOMETER
II—Hinged cover lifted.
III—Cover removed.
24 HOUR PROGRAM DIAL
(GRAY AREA FOR NIGHT
SETTING)
HIGH
AAA ALKALINE
TEMPERATURE
PROGRAM PINS
FLIP-UP
COVER
BATTERY (2) INCLUDED
LOW TEMPERATURE
CONTROL LEVER
(BLUE)
CONTROL LEVER
(RED)
24 HOUR PROGRAM DIAL
(GRAY AREA FOR
NIGHT SETTINGS)
SWITCH
BULBS
CAPTIVE
MOUNTING
SCREW
CAPTIVE
MOUNTING
SCREW
HEAT
ANTICIPATOR
SETTING
LEVER
THERMOSTAT
BASE
PROGRAM
INDEX WHEEL
WALLPLATE (BEHIND
THERMOSTAT. HELD
ON BY TWO CAPTIVE
SCREWS.)
ADJUSTABLE HEAT
ANTICIPATOR
PROGRAM
PIN SLOT
PROGRAM
INDEX WHEEL
PROGRAM
PIN
TIME INDICATOR
ARROW
TIME
INDICATOR
ARROW
STORAGE
M9615
THERMOSTAT COVER
M9614
D.F. • Rev. 11-96 • Printed in U.S.A. •
•
©Honeywell Inc. 1996 • Form Number 69-0394—3
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IMPORTANT: If old thermostat has B or O terminals, this
thermostat cannot be used on your system.
EXCEPTION: The CT1802 Thermostat can be used
on a system with B or O terminals.
BULB
SWITCH
One or two extra wires?
ANTICIPATOR
SCALE
If you are replacing a Honeywell Chronotherm® Thermostat,
you may find one or two wires that go to the clock termi-
nals on the Chrontherm® Thermostat wiring wallplate. Do
not allow them to touch, or you may damage your trans-
former. Disconnect the wires, and wrap them separately,
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.
ANTICIPATOR
SETTING LEVER
M6115
Disconnect wires from old thermostat, wallplate or
subbase. Tape each end and label with the letter of
the terminal designation to make reconnection easier. If
there are only two wires labeling is not necessary.
4
MOUNT WALLPLATE OR SUBBASE
EXISTING
EXISTING
HORIZONTAL
OUTLET BOX
HORIZONTAL
OUTLET BOX
O
R
B
R
W
W
HEATING/
COOLING
SUBBASE
HEATING-ONLY
WALLPLATE
G
Y
FAN
COOL
ON
AUTO
HEAT
OFF
M856A
M1553A
If mounting on outlet box , mount as shown in
appropriate illustration.
Position wallplate or subbase as shown in appropriate
figure, and loosely insert the screws supplied.
When mounting on wall, hold wallplate or subbase in
position and mark holes on wall. Use level to make
Carefully level the wallplate or subbase and firmly
tighten screws.
sure wallplate or subbase will be level. Drill 3/16 in. holes
and gently tap anchors into holes until flush with the wall.
VERTICAL
196393A
OUTLET
BOX
ASSEMBLY
COVER
3 SCREW HOLES
WITH PLASTIC
ANCHORS
ADAPTER
PLATE
RING
MOUNTING
SCREWS (2)
O
O
B
B
W
R
R
Y
G
W
G
Y
SUBBASE OR
WALLPLATE
FAN
COOL
ON
AUTO
HEAT
OFF
MOUNTING
SCREWS (2)
M866
HEATING/COOLING SUBBASE
M1552A
3
69-0394—3
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3 SCREW HOLES
WITH PLASTIC
ANCHORS
SPIRIT LEVEL
O
HEATING-ONLY
WALLPLATE
B
R
G
W
Y
FAN
COOL
ON
AUTO
HEAT
OFF
M2419
M9612
5
WIRE WALLPLATE OR SUBBASE
3-WIRE SYSTEM
NOTE: All wiring must comply with local electrical codes
and ordinances.
Refer to illustration and strip thermostat wire
insulations as necessary.
R
FOR STRAIGHT
CONNECTION—
STRIP 5/16 in. [8 mm]
W
FOR WRAPAROUND
BARRIER
B
W
CONNECTION—
HEATING
VALVE OR
MOTOR
STRIP 7/16 in. [11 mm]
1
L2
L1
M1556B
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
FOR CT1800 heating—only
M2485B
For 2-wire system, connect either wire to R terminal
and the other wire to W terminal. For 3-wire system,
connect W wire to W terminal, R wire to R terminal, and
remaining wire to B terminal. Firmly tighten screws.
FOR CT1801 heating/cooling
Connect the wires to matching terminals on the
subbase.
Push excess wire back into wall, and plug hole in
wall with nonflammable insulation to prevent drafts
from affecting thermostat operation.
NOTE: If there are four wires, connect wire marked R to
terminal RH and add a jumper wire to connect to RC. If
RC is left unconnected, the air conditioner will not turn
on. The 4-wire drawing on page shows how to jumper
RC to RH. Strip the insulation off the wire where it
connects to the terminals. Firmly tighten screws.
2-WIRE SYSTEM
If the labels do not agree with the terminal designations on
your new subbase:
R
•
•
Refer to Table 2
Determine correct hookup from the listed control
function and the equipment control circuit.
W
Push excess wire back into wall, and plug hole in the
wall with nonflammable insulation to prevents drafts
from affecting thermostat operation.
HEATING RELAY
OR VALVE COIL
1
L2
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M2484B
69-0394—3
4
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4-WIRE SYSTEM
5-WIRE SYSTEM
2
RC
RH
RC
RH
W
W
G
G
Y
Y
FAN
ON
COOL
FAN
ON
AUTO
HEAT
OFF
COOL
AUTO
HEAT
OFF
COOLING
CONTACTOR
COIL
FAN
RELAY
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
HEATING
RELAY OR
VALVE COIL
1
1
1
L1
(HOT)
L1
L1
(HOT)
(HOT)
L2
L2
L2
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M2413
M2414
INSTALL JUMPER BETWEEN RC AND RH.
TABLE 2—TERMINAL DESIGNATIONS.
Subbase Terminal
Control Function
R or RH
Heating transformer power to control circuit
RX
W
Y
Cooling transformer power to control circuit
Heating relay or valve
Cooling relay
G
B
Fan relay
Heating changeover valve or damper control circuit
Cooling changeover valve or damper control circuit
Heat pump compressor control circuit.
O
P
SINGLE STAGE HEAT PUMP
(WITHOUT AUXILIARY HEAT) SYSTEM
FOR CT1802 heating/cooling
Connect the wires to matching terminals on the
subbase. Firmly tighten screws.
Y
Push excess wire back into wall, and plug hole in
wall with nonflammable insulation to prevent drafts
from affecting thermostat operation.
W
B
3
2
P
R
O
CENTRAL ELECTRIC SYSTEM
G
FAN
COOL
ON
AUTO
HEAT
OFF
Y
W
B
FAN
RELAY
REVERSING
VALVE
COMPRESSOR
CONTACTOR
COIL
P
R
O
L2
G
L1
(HOT)
FAN
COOL
ON
AUTO
HEAT
OFF
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
HEATING
RELAY OR
VALVE COIL
FAN
RELAY
COOLING
CONTACTOR
COIL
IF COMPRESSOR IS CONNECTED TO OLD THERMOSTAT'S
"Y" TERMINAL WITH A JUMPER TO "W", USE NEW THERMOSTAT'S
"P" TERMINAL FOR COMPRESSOR. IF OLD THERMOSTAT HAS
ONE WIRE TO "Y" AND ONE TO "W", USE "Y" AND "W" ON NEW
THERMOSTAT; DO NOT USE "P". IMPORTANT– IF OLD
THERMOSTAT USES A W2 (AUXILIARY OR EMERGENCY HEAT)
TERMINAL, THIS THERMOSTAT MAY NOT BE USED. THIS
THERMOSTAT IS NOT DESIGNED TO CONTROL AUXILIARY HEAT.
1
L2
L1
(HOT)
3
SOME HEAT PUMPS USE "B" INSTEAD OF "O".
M2415B
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M2412A
5
69-0394—3
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6
MOUNT THE THERMOSTAT
Note the tabs on the top inside edge of the thermostat
base. These fit the slots molded into the top of the
wallplate or subbase.
Hang the thermostat base on the wallplate or
subbase as shown in illustration.
TAB (2)
Insert the two captive mounting screws located in
the bottom corners of the thermostat base (see
illustration); firmly tighten.
MOUNTING SLOT (2)
1
IMPORTANT: Do not cycle heating system until step 7 is
completed.
35
0
3
5
2
20
0
1
JUMPER WIRES
CAPTIVE
WALLPLATE
OR SUBBASE
THERMOSTAT
BASE
MOUNTING SCREWS
M3408
7
SET HEAT ANTICIPATOR LEVER
The thermostat adjustable heat anticipator must be
correctly set to accurately control the on-time length
valve, a relay or burner control box, Aquastat controller or
zone valve with the thermostat wires connected to it.These
controls are usually located behind the furnace cover. See
next illustration.
of the system. An incorrect setting can result in room
temperature swings or burn out the anticipator and void the
thermostat warranty.
If current rating is still unavailable, proceed as follows:
•
Connect the probes of an ac ammeter (0 to 2.0A for
example) between the R (or RH) and W terminals on
the wallplate or subbase.
Let the system operate through the ammeter for at least
one minute before taking reading. Record the reading
Make sure you have the current draw (anticipator setting)
for your system. This is the number you wrote in the box in
Step 3. If you were unable to find the current draw for Step 3,
this information can be found printed on the primary control
at the furnace or boiler. The primary control is usually a gas
•
here
.
OIL BURNER CONTROL
SHOWS
CURRENT
DRAW
SHOWS
VOLTAGE
RATING
SHOWS
VOLTAGE
RATING
30 VAC
0.2 AMP
V8043E 1004 4
24V 50/60CY
.32 AMP @ 60CY
SHOWS
ANTICIPATOR
SETTING
SHOWS
VOLTAGE
RATING
T
T
TO
BURNER
F
F
24 Vac 50/60 Hz
0.4 AMP
FROM MAIN
SHOWS
FUEL SUPPLY
ANTICIPATOR
SETTING
ZONE VALVE
M6116B
TYPICAL GAS VALVE
Move the heat anticipator to match the number you
recorded in Step 3 or found on the primary control
as shown above, or as recorded in Step 7.
IMPORTANT: Most hot water systems require a setting of
1.3 times the valve current rating.
ANTICIPATOR
SCALEPLATE
ANTICIPATOR
SETTING LEVER
M9616
69-0394—3
6
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8
INSTALL CLOCK BATTERIES
BATTERY LOCATION
FOR (2) AAA BATTERIES;
INSTALL WITH POSITIVE
ENDS UP
Power is supplied to the clock by two AAA alkaline
batteries (included). Install clock batteries in
thermostat as shown. Once a year, or when batteries are
dead, replace with two new AAA alkaline batteries. We
recommend Energizer® batteries. Other types of batteries
are more likely to leak, which could damage the clock. The
thermostat itself will operate without batteries, but will not
operate as a fuel saver.
M9619
9
SET CLOCK
Adjust the clock by moving the minute hand in
PROGRAM
INDEX
WHEEL
clockwise direction. Do not reverse the minute hand.
When time is correctly set, the Time Indicator Arrow
(see illustration) must point to the correct time and
the corresponding daytime (light) or nighttime (dark)
portion of the program dial.
TIME
INDICATOR
ARROW
M2499
10
ATTACH THERMOSTAT COVER
Make sure the packing inserts in the thermostat
base have been removed, as explained in Step 2.
Place the two tabs on upper edges of cover into the
mounting slots in the thermostat base.
Swing cover downward until it engages catch at
bottom of base.
M9618
11
CHECKOUTTHERMOSTAT OPERATION AND SETTEMPERATURE CONTROL LEVERS
The two levers on top of the thermostat control the
low and high temperature for energy savings and
comfort control as shown in the illustration.
CAUTION
Do not check operation by shorting across
terminals of relay or valve coil; this will burn out the
thermostat heat anticipator, which will void the
warranty.
LOW TEMPERATURE
(BLUE MARK)
SET LEVER
HIGH TEMPERATURE
(RED MARK)
SET LEVER
70
60
80
50
Heating-Only System
Turn on power to the furnace.
M859
7
69-0394—3
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Push both temperature control levers together at
least 5°F (3°C) above room temperature.The heat
should come on. The fan will start when the furnace heats
up,
Move both levers together 5°F (3°C) above room
temperature.The cooling equipment should shut off.
Place the fan switch at ON.The fan should run
continuously with the system in any position.
Move both levers 5°F (3°C) below room temperature.
The heat should shut off.
Place the system switch at OFF. Move both
temperature levers to various positions. The heating
and cooling systems should not operate.
Operate the entire heating system for at least one
complete cycle.
Operate the entire system for at least one complete
cycle with the system switch at COOL and one
complete cycle with the switch at HEAT.
IMPORTANT: If thermostat fails any test, refer to the
Troubleshooting Guide in Owner’s manual.
IMPORTANT: If thermostat fails any test, refer to trouble-
Heating/Cooling System
shooting guide in owner’s manual.
Turn on power to the furnace and cooling system.
After checkout, reset both temperature levers to
desired temperatures.
Place the system switch lever at HEAT and the fan
switch lever at AUTO.
For heating season:
Push both temperature control levers together at
least 5°F (3°C) above room temperature.The heat
should come on. The fan will start when the furnace heats
up. On the CT1802, the fan will start immediately.
Move the blue lever to the energy savings
temperature you want when you are sleeping or your
home is not occupied.
Set the red lever to the temperature you want for
normal comfort periods.
Move both levers together at 5°F (3°C) below room
temperature.The heat should shut off.The fan will
stop when the furnace cools.
For cooling season:
IMPORTANT: To avoid compressor damage, do not
operate the cooling system if outdoor temperature is
below 50°F (3°C) below room temperature.The heat
should shut off. The fan will stop when the furnace
cools.
Move the red lever to the energy savings
temperature you want when you are sleeping or your
home is not occupied.
Set the blue lever to the temperature you want for
normal comfort periods.
Place the system switch level at COOL and the fan
switch lever at AUTO.
Refer to the owner’s manual form 69-0333 for operating
and programming instructions.
Push both temperature control levers together at
least 5°F (3°C) below room temperature.The cooling
equipment should operate, and the fan will start. Allow for
any time delay that may be built into the compressor
control circuit.
If you have questions regarding the thermostat please If you have questions regarding the Honeywell Fuel Saver
Thermostat please visit our web site at www.honeywell.com/yourhome, or call the customer information line at
1-800-468-1502.
Helping You Control Your World
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