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CT1800, CT1801, CT1802
Electromechanical Fuel Saver Thermostat 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
M3375
This control contains mercury in a sealed tube. Do not place control in the trash at the end of its useful life.
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)
Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control, or of an old control containing mercury in a sealed tube.
HIGH TEMPERATURE
CONTROL LEVER
(RED)
II—Hinged cover lifted.
24 HOUR PROGRAM DIAL
(GRAY AREA FOR NIGHT
SETTING)
THERMOSTAT COVER THERMOMETER
PROGRAM PINS FLIP-UP
COVER
M9613
III—Cover removed.
AAA ALKALINE
BATTERY (2) INCLUDED
24 HOUR PROGRAM DIAL
(GRAY AREA FOR
NIGHT SETTINGS)
LOW TEMPERATURE
CONTROL LEVER
(BLUE)
HIGH
TEMPERATURE
CONTROL LEVER
(RED)
SWITCH
BULBS
CAPTIVE
MOUNTING
SCREW
CAPTIVE
MOUNTING
SCREW
PROGRAM
INDEX WHEEL
HEAT
ANTICIPATOR
SETTING
LEVER
ADJUSTABLE HEAT
ANTICIPATOR
TIME INDICATOR
ARROW
THERMOSTAT
BASE
WALLPLATE (BEHIND
THERMOSTAT. HELD
ON BY TWO CAPTIVE
SCREWS.)
M9615
PROGRAM
PIN SLOT
PROGRAM
INDEX WHEEL
THERMOSTAT COVER
TIME
INDICATOR
ARROW
PROGRAM
PIN
STORAGE
M9614
D.F. • Rev. 11-96 • Printed in U.S.A. • • ©Honeywell Inc. 1996 • Form Number 69-0394—3
M3375
69-0394—3
1
PREPARATION
Check thermostat and wallplate suitability for your heating or heating/cooling system. Refer to Table 1.
Thermostat
Model
CT1800
TABLE 1—THERMOSTAT AND SUBBASE APPLICATIONS.
a
Subbase Wallplate
Included For Use With
199986B Wallplate 2- or 3- wire, 150 to 30 volt control circuit. For gas or oil heating system or
3-wire zone valve heating system.
CT1801 Q682A1079 Subbase 4- or 5- wire, 15-30 volt control circuit. For gas or oil heating/cooling system.
CT1802 Q682B1227 Subbase 4- wire, 15 to 30 volt control circuit. For single-stage heat pump without auxiliary heat or central electric heating/cooling systems that require the thermostat to control the fan in heating.
a
Thermostat must be mounted on wallplate or subbase included in package to assure operation.
Assemble tools as required.
If wallplate or subbase is mounted on a vertical outlet box (check old installation), order 196393A
Cover Plate and Adapter Ring (see appropriate illustration in Step 4). To order check your telephone directory for your local Honeywell distributor.
FLAT BLADE
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
DISCONNECTED FROM
OLD THERMOSTAT
Test to make certain that your heating and cooling systems are working. If either one does not work, contact your local heating/air conditioning dealer.
NOTE: Do not operate cooling sytem if outdoor temperature is below 50 ° F (10 ° C)
Turn off power to the heating/cooling system at the main fuse panel.
LEVEL TO LEVEL THERMOSTAT
FOR ACCURATE OPERATION M834A
2
UNPACK THERMOSTAT
Remove and discard shipping wrap. Save package of screws, instructions and receipt.
Remove thermostat cover by lifting up from the bottom.
Carefully remove insert protecting switch bulbs.
Loosen two captive mounting screws, and separate wallplate or subbase from back of thermostat base.
50
60
70
80
THERMOSTAT
COVER
THERMOSTAT
BASE
CAPTIVE
MOUNTING
SCREWS
LIFT
COVER
M9617
3
REMOVE OLD THERMOSTAT
Remove cover of old thermostat. If the cover does not snap off when pulled firmly from the bottom, check for a screw that locks on the cover.
Before removing the old thermostat from the wall, look at it carefully to locate the heat anticipator adjustment mechanism. (See illustration to help you recognize the heat anticipator.) Make a note here of that anticipator setting for future reference. If your thermostat does not have a heat anticipator, do not be concerned. Move on to next paragraph.
Loosen screws holding thermostat to wallplate, subbase or wall and lift away.
69-0394—3 2
BULB
SWITCH
ANTICIPATOR
SCALE
M6115
ANTICIPATOR
SETTING LEVER
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
HORIZONTAL
OUTLET BOX
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.
One or two extra wires?
If you are replacing a Honeywell Chronotherm
®
Thermostat, you may find one or two wires that go to the clock terminals on the Chrontherm
®
Thermostat wiring wallplate. Do not allow them to touch, or you may damage your transformer. 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.
EXISTING
HORIZONTAL
OUTLET BOX
R
O
B
W
G
HEATING/
COOLING
SUBBASE
FAN
ON AUTO
Y
HEAT OFF
COOL
M1553A
If mounting on outlet box , mount as shown in appropriate illustration.
When mounting on wall, hold wallplate or subbase in position and mark holes on wall. Use level to make sure wallplate or subbase will be level. Drill 3/16 in. holes and gently tap anchors into holes until flush with the wall.
3 SCREW HOLES
WITH PLASTIC
ANCHORS
R
W
HEATING-ONLY
WALLPLATE
M856A
Position wallplate or subbase as shown in appropriate figure, and loosely insert the screws supplied.
Carefully level the wallplate or subbase and firmly tighten screws.
VERTICAL
OUTLET
BOX
ADAPTER
RING
196393A
ASSEMBLY
COVER
PLATE
O
B
R
W
G
Y
FAN
ON AUTO HEAT OFF
COOL
HEATING/COOLING SUBBASE
M1552A
M866
MOUNTING
SCREWS (2)
SUBBASE OR
WALLPLATE
MOUNTING
SCREWS (2)
R
O
B
W
Y
G
3 69-0394—3
3 SCREW HOLES
WITH PLASTIC
ANCHORS
HEATING-ONLY
WALLPLATE
SPIRIT LEVEL
R
O
B
W
G
FAN
ON AUTO
Y
HEAT OFF
COOL M2419
M9612
5
WIRE WALLPLATE OR SUBBASE
NOTE: All wiring must comply with local electrical codes and ordinances.
Refer to illustration and strip thermostat wire insulations as necessary.
FOR STRAIGHT
CONNECTION—
STRIP 5/16 in. [8 mm]
3-WIRE SYSTEM
R
W
FOR WRAPAROUND
CONNECTION—
STRIP 7/16 in. [11 mm]
M1556B
FOR CT1800 heating—only
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.
Push excess wire back into wall, and plug hole in wall with nonflammable insulation to prevent drafts from affecting thermostat operation.
2-WIRE SYSTEM
R
W
BARRIER
HEATING RELAY
OR VALVE COIL
1
L2
1
L1
(HOT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M2484B
B W
HEATING
VALVE OR
MOTOR
1
L2
L1
(HOT)
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M2485B
FOR CT1801 heating/cooling
Connect the wires to matching terminals on the subbase.
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.
If the labels do not agree with the terminal designations on your new subbase:
• Refer to Table 2
• Determine correct hookup from the listed control function and the equipment control circuit.
Push excess wire back into wall, and plug hole in the wall with nonflammable insulation to prevents drafts from affecting thermostat operation.
69-0394—3 4
4-WIRE SYSTEM 5-WIRE SYSTEM
G
FAN
ON AUTO
2
RC
RH
W
Y
HEAT OFF
COOL
HEATING
RELAY OR
VALVE COIL
FAN
RELAY
COOLING
CONTACTOR
COIL
G
FAN
ON AUTO
RC
RH
W
Y
HEAT OFF
COOL
HEATING
RELAY OR
VALVE COIL
FAN
RELAY
COOLING
CONTACTOR
COIL
1
L1
(HOT)
L2
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
INSTALL JUMPER BETWEEN RC AND RH.
M2414
1
L1
(HOT)
L2
L1
(HOT)
L2
1
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M2413
Subbase Terminal
R or RH
RX
W
Y
G
B
O
P
TABLE 2—TERMINAL DESIGNATIONS.
Control Function
Heating transformer power to control circuit
Cooling transformer power to control circuit
Heating relay or valve
Cooling relay
Fan relay
Heating changeover valve or damper control circuit
Cooling changeover valve or damper control circuit
Heat pump compressor control circuit.
FOR CT1802 heating/cooling
Connect the wires to matching terminals on the subbase. Firmly tighten screws.
Push excess wire back into wall, and plug hole in wall with nonflammable insulation to prevent drafts from affecting thermostat operation.
CENTRAL ELECTRIC SYSTEM
W
B
R
G
Y
P
O
FAN
ON AUTO HEAT OFF
COOL
COOLING
CONTACTOR
COIL
FAN
RELAY
HEATING
RELAY OR
VALVE COIL
L2
1
1
L1
(HOT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M2412A
SINGLE STAGE HEAT PUMP
(WITHOUT AUXILIARY HEAT) SYSTEM
3
W
B
R
G
Y
2
P
O
FAN
ON AUTO HEAT OFF
COOL
COMPRESSOR
CONTACTOR
COIL
REVERSING
VALVE
FAN
RELAY
L2
1
L1
(HOT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2 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.
3 SOME HEAT PUMPS USE "B" INSTEAD OF "O".
M2415B
5 69-0394—3
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.
Insert the two captive mounting screws located in the bottom corners of the thermostat base (see illustration); firmly tighten.
IMPORTANT: Do not cycle heating system until step 7 is completed.
TAB (2)
MOUNTING SLOT (2)
6
5
4
3 2
1 12
11
1
0
12
35
30
25
20
10
M3408
THERMOSTAT
BASE
WALLPLATE
OR SUBBASE
JUMPER WIRES
CAPTIVE
MOUNTING SCREWS
7
SET HEAT ANTICIPATOR LEVER
The thermostat adjustable heat anticipator must be correctly set to accurately control the on-time length of the system. An incorrect setting can result in room temperature swings or burn out the anticipator and void the thermostat warranty.
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 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.
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 here .
OIL BURNER CONTROL
SHOWS
CURRENT
DRAW
SHOWS
VOLTAGE
30 VAC
0.2 AMP
RATING
SHOWS
VOLTAGE
RATING
SHOWS
ANTICIPATOR
SETTING
V8043E 1004 4
24V 50/60CY
.32 AMP @ 60CY
SHOWS
VOLTAGE
RATING
24 Vac 50/60 Hz
0.4 AMP
TO
BURNER
T
T
F
F
FROM MAIN
FUEL SUPPLY
SHOWS
ANTICIPATOR
SETTING ZONE 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.
M6116B
TYPICAL GAS VALVE
IMPORTANT: Most hot water systems require a setting of
1.3 times the valve current rating.
ANTICIPATOR
SCALEPLATE
ANTICIPATOR
SETTING LEVER
6
M9616
69-0394—3
8
INSTALL CLOCK BATTERIES
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.
BATTERY LOCATION
FOR (2) AAA BATTERIES;
INSTALL WITH POSITIVE
ENDS UP
M9619
9
SET CLOCK
Adjust the clock by moving the minute hand in 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.
PROGRAM
INDEX
WHEEL
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
CHECKOUT THERMOSTAT OPERATION AND SET TEMPERATURE 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.
LOW TEMPERATURE
(BLUE MARK)
SET LEVER
HIGH TEMPERATURE
(RED MARK)
SET LEVER
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.
50 60 70 80 Heating-Only System
Turn on power to the furnace.
M859
7 69-0394—3
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 5 ° F (3 ° C) below room temperature.
The heat should shut off.
Operate the entire heating system for at least one complete cycle.
IMPORTANT: If thermostat fails any test, refer to the
Troubleshooting Guide in Owner’s manual.
Heating/Cooling System
Turn on power to the furnace and cooling system.
Place the system switch lever at HEAT and the fan switch lever at AUTO.
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 both levers together at 5 ° F (3 ° C) below room temperature. The heat should shut off. The fan will stop when the furnace cools.
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.
Place the system switch level at COOL and the fan switch lever at AUTO.
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.
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.
Place the system switch at OFF. Move both temperature levers to various positions. The heating and cooling systems should not operate.
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 troubleshooting guide in owner’s manual.
After checkout, reset both temperature levers to desired temperatures.
For heating season:
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.
For cooling season:
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.
Refer to the owner’s manual form 69-0333 for operating and programming instructions.
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.
8
4
Helping You Control Your World www.honeywell.com/yourhome
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