Honeywell CT3400 Owner's Manual - Page 5

not allow them to touch, or you can 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. Six or more wires? If there are six or more wires (excluding clock wires attached to terminals), you most likely have a variation of a heat pump or multistage system. The thermostat is not compatible with such systems so return the product to the place of purchase. If you would like information about which programmable thermostats will work with your system, call Honeywell Customer Assistance at 1-800-468-1502. Three thermostat wires? If you have three wires for heating only and can operate the fan using the fan ON switch, this thermostat will work with your system. However, some hot water (zoned) heating systems have three thermostat wires. The thermostat will not work without installing an isolating relay on these systems. For details, call Honeywell Customer Assistance at 1-800-468-1502. 5 69-0733-3 STEP 3 Before You Program Install the Batteries IMPORTANT: Three AA alkaline batteries are included with the thermostat. Batteries must be installed for programming and operation of the thermostat and heating/cooling system. s Install the batteries in back of the thermostat as shown, making sure positive (+) terminals all face toward the right. As the batteries are running low, a REPL BAT indicator will flash for 1 to 2 months before batteries run out completely. Replace the batteries as soon as possible after the indicator starts flashing. If you insert new batteries within 20 to 30 sec- onds of removing the old ones, you will not have to reprogram the thermostat. However, if the display is blank, the batteries are dead or incorrectly installed. In this case, you will have to reprogram. See pages 13 through 15 to reprogram. If you do not reprogram, the factory-preprogrammed BACK OF THERMOSTAT settings will be in effect, as shown in chart on pages 11 and 12. INSTALL 3 AA ALKALINE BATTERIES AS SHOWN, POSITIVE (+) TERMINALS TOWARD RIGHT. M2589 6 69-0733-3