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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
Contact your local waste management authority for
This control contains mercury in a sealed tube. Do not instructions regarding recycling an
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1 PREPARATION Check thermostat and wallplate suitability for your heating or heating/cooling system. Refer to Table 1. a TABLE 1—THERMOSTAT AND SUBBASE APPLICATIONS. Thermostat Subbase Wallplate Model Included For Use With CT1800 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
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IMPORTANT: If old thermostat has B or O terminals, this thermostat cannot be used on your system. BULB EXCEPTION: The CT1802 Thermostat can be used SWITCH on a system with B or O terminals. One or two extra wires? ANTICIPATOR ® If you are replacing a Honeywell Chronotherm Thermostat, SCALE you may find one or two wires that go to the clock termi- ® nals on the Chrontherm Thermostat wiring wallplate. Do ANTICIPATOR not allow them to touch, or you may damage your trans- M6115 SETTING LEVER former.
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3 SCREW HOLES WITH PLASTIC SPIRIT LEVEL ANCHORS O HEATING-ONLY B WALLPLATE R W G 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— W STRIP 5/16 in. [8 mm] FOR WRAPAROUND BW BARRIER CONNECTION— HEATING STRIP 7/16 in. [11 mm] VALVE OR MOTOR 1 L2 M1556B L1 (HOT) 1 POWER SUPPLY. PROVIDE DISCONN
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4-WIRE SYSTEM 5-WIRE SYSTEM 2 RC RC RH RH W W G G Y Y FAN COOL ON AUTO HEAT OFF FAN COOL ON AUTO HEAT OFF FAN COOLING HEATING COOLING HEATING FAN RELAY CONTACTOR RELAY OR CONTACTOR RELAY OR RELAY COIL VALVE COIL COIL VALVE COIL 1 1 1 L1 L1 L1 (HOT) (HOT) (HOT) L2 L2 L2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. OVERLOAD PROTECTION AS REQUIRED. M2413 M2414 2 INSTALL JUMPER BETWEEN RC AND RH. TABLE 2—TERMINAL DESIGNA
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6 7 8 9 10 11 0.2 AMP 30 VAC T T F F 12 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 TAB (2) subbase as shown in illustration. Insert the two captive mounting screws located in MOUNTING SLOT (2) the bottom corners of the thermostat base (see illustration); firmly tighten. 1 IMPORTANT: Do not cycle heating system until step 7 is completed. 35 JU
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8 INSTALL CLOCK BATTERIES BATTERY LOCATION Power is supplied to the clock by two AAA alkaline FOR (2) AAA BATTERIES; INSTALL WITH POSITIVE batteries (included). Install clock batteries in ENDS UP 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
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Push both temperature control levers together at Move both levers together 5°F (3°C) above room least 5°F (3°C) above room temperature. The heat temperature. The cooling equipment should shut off. should come on. The fan will start when the furnace heats up, 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
