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Refer to Table 1 for a general description of the thermostat. All T8602 thermostats are powered by batteries. Table 1. Description of T8602 Thermostats. T8602 System Changeover System Selection Fan Selection Comments C Heat-Cool Manual Heat-Off-Cool On-Auto System and fan selections are made on keyboard. MERCURY NOTICE If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of properly. Contact your local waste management authority for instructions regarding recycling and the proper disposal of the old control. INSTALLATION When Installing this Product... 1. Read these instructions carefully. Failure to follow the instructions can damage the product or cause a hazardous condition. 2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. 3. Installer must be a trained, experienced service technician. 4. After completing installation, use these instructions to check out the product operation. Location Install the thermostat about 5 ft (1.5m) above the floor in an area with good air circulation at average temperature. See Fig. 1. Do not install the thermostat where it can be affected by: — drafts, or dead spots behind doors and in corners. — hot or cold air from ducts. — radiant heat from sun or appliances. — concealed pipes and chimneys. — unheated (uncooled) areas such as an outside wall behind the thermostat. Wallplate Installation The thermostat can be mounted horizontally on the wall or on a 2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box. Position wallplate horizontally on the wall or on a 2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box. ® U.S. Registered Trademark Copyright © 2003 Honeywell • • All Rights Reserved 69-1670 T8602C CHRONOTHERMT8602C CHRONOTHERMIV DELUXE PROGRAMMABLE THERMOSTATS 5 FEET [1.5 METERS] YES NO NO NO M10106 Fig. 1. Typical location of thermostat. 1. Position and level the wallplate (for appearance WIRING only). The thermostat functions correctly even when not level. 2. Use a pencil to mark the mounting holes. All wiring must comply with local electrical codes and See Fig. 2. ordinances. Refer to Fig. 3 and 6 for typical hookup. A letter code is located near each terminal for identification. 3/16 inch (76 mm) holes in the wall (if drywall) as marked. For firmer material such as plaster, drill two 7/32 inch (5.56 mm) holes. Gently tap anchors 3. Remove the wallplate from the wall and drill two CAUTION (provided) into drilled holes until flush with wall. Electrical Hazard. 4. Position the wallplate over the holes, pulling wires Can cause electric shock or equipment through the wiring opening. damage. 5. Loosely insert the mounting screws into the holes. Disconnect power before wiring. 6. Tighten mounting screws. 1. Loosen the terminal screws on the wallplate and connect the system wires. See Fig. 7. IMPORTANT Use 18 gauge, color-coded thermostat cable for proper wiring. 2. Securely tighten each terminal screw. 3. Push excess wire back into the hole. 4. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat. THERMOSTAT MOUNTING HOLES M15044 FAN RELAY G HEAT RELAY RW 1 L1 (HOT) L2 Fig. 2. Mounting the wallplate. WIRES THROUGH WALL WALL MOUNTING SCREWS WALL ANCHORS (2) 1 TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M10409 Fig. 3. Typical hookup in heat application. 69-1670 2 T8602C CHRONOTHERMT8602C CHRONOTHERMIV DELUXE PROGRAMMABLE THERMOSTATS THERMOSTAT THERMOSTAT L1 (HOT) L2 FAN RELAY Y G HEAT RELAY RW COMPRESSOR CONTACTOR B HEAT DAMPER COOL DAMPER O 2 2 1 OTOT OUTDOOR TEMPERATURE SENSOR 3 RC TRANSFORMER 1 2 3 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A SEPARATE CABLE FROM THE THERMOSTAT CABLE. M10347A Fig. 4. Typical hookup in heat and cool systemwith one transformer. THERMOSTAT L1 (HOT) L2 FAN RELAY Y GRC HEAT RELAY RW L1 (HOT) L2 COMPRESSOR CONTACTOR B HEAT DAMPER COOL DAMPER O 2 3 3 1 OTOT OUTDOOR TEMPERATURE SENSOR 45 1 2 1 3 4 5 HEATING TRANSFORMER COOLING TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A ONE TRANSFORMER SYSTEM. CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A SEPARATE CABLE FROM THE THERMOSTAT CABLE. T8600D MODELS REQUIRE POWER TO R TERMINAL AT ALL TIMES. M10348 Fig. 5. Typical hookup in heat and cool systemwith two transformers. G O B LIMIT CONTROL PILOTSTAT CONTROL (IF USED) MILLIVOLTAGE Y RW OTOT OUTDOOR TEMPERATURE SENSOR 1 PP TH/ PP TH MILLIVOLTAGE GAS CONTROL GENERATOR 1 AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A SEPARATE CABLE FROM THE THERMOSTAT CABLE. M20270 Fig. 6. T8602 typical millivoltage heating circuit. . FOR WRAPAROUND FO...