CT8611 PROGRAMMABLE HEAT PUMP THERMOSTAT INSTALLATION MANUAL IMPORTANT: This thermostat may be programmed either before or after installation. Refer to Owner’s Guide, form 69-0398, for programming instructions.
Toll-free Customer Assistance For all questions concerning this thermostat, please read and follow the instructions. If additional assistance is needed, call Honeywell Customer Assistance toll-free at 1-800-468-1502, Monday-Friday, 7:00 a.m.-5:30 p.m. Central Time. Before you call, please have the following information available—thermostat model number and date code, kind of heating/cooling system (i.e., hot water, warm air, oil, gas, etc.), number of wires connected to the thermostat.
1 PREPARATION Your new thermostat provides energy saving control for a 24 Vac multistage heat pump heating/ cooling system direct from the control transformer. The CT8611 includes SYSTEM and ENRG SAV LEDs located near the top of the thermostat face. The SYSTEM LED lights when the thermostat is signaling for heating or cooling. The ENRG SAV LED lights during the LEAVE and SLEEP periods. The CT8611 also includes AUX. HT. and EM. HT. LEDs near the bottom center of the subbase. The AUX. HT.
TOOLS REQUIRED FOR INSTALLATION Assemble a flat blade screwdriver and other tools as needed (right). FLAT BLADE SCREWDRIVER Test to make certain that your heating and cooling systems are working properly. If either does not work, contact your local heating/air conditioning dealer. To avoid compressor damage, do not operate the cooling system if outdoor temperature is below 50° F [10° C].
2 REMOVE OLD THERMOSTAT Disconnect wires from old thermostat or sub base. Always label all wires as you disconnect them from your old thermostat. Use the CT8611 Wire Tags provided to label each wire with the appropriate terminal designation as you remove it. It is important to note the terminal designation when removing wires. Not all thermostats are wired by color code. Keep the wires from falling back into the wall by wrapping them around a pencil, as shown.
Do not discard your old thermostat until you have thoroughly checked out system operation with your new Honeywell CT8611 Heat Pump Thermostat installed. If your old thermostat contains mercury, do not dispose of it in the trash, see below. MERCURY SWITCH ANTICIPATOR SCALE RECYCLING THERMOSTAT If this thermostat is replacing a thermostat that contains mercury in a sealed tube, do not place your old thermostat in the trash.
3 MOUNT THERMOSTAT SUBBASE The subbase does not require leveling for proper operation; level it for appearance only. Thread wires through the center opening of the subbase. Then, mount the subbase using the two screws provided. Gently tighten the screws, level the top surface of the subbase and then securely tighten the screws. Remove thermostat from subbase (Fig. 1). Mount the subbase directly onto the wall with the screws included in the package.
4 WIRE THERMOSTAT TERMINALS FOR STRAIGHT INSERTION – STRIP 5/16 in. [8 mm] NOTE: All wiring must comply with local codes and ordinances. If unsure about household wiring procedures, call Honeywell Customer Assistance with your questions Monday-Friday, 7:00 a.m.5:30 p.m., Central time, 1-800-468-1502. FOR WRAPAROUND – STRIP 7/16 in.
Figs. 4 and 5 illustrate typical hookups for the CT8611 heat pump thermostat. CT8611R CT8611R R C R O C O B P L B G Y1 W1 P E L E W2 DEFROST CONTROL COMPRESSOR CONTACTOR MONITOR 1 G Y1 W1 EM. HT. RELAY W2 AUX. HT. RELAY FAN C/O RELAY HEAT C/O RELAY COOL POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. MONITOR DEFROST CONTROL 1 1ST STAGE HEAT RELAY 1ST STAGE COOL RELAY AUX. HT. RELAY EM. HT.
5 COMPLETE INSTALLATION ADJUST CYCLE RATE 1st stage heating and 1st stage cooling cycle rates are factory-set for heat pumps. The heat pump compressor cycle rate cannot be adjusted. To customize the thermostat’s performance to different types of heating equipment, however, a cycle rate adjustment screw is provided on the back of the thermostat to control the auxiliary heat cycle rate. Correct setting of the screw will provide optimum savings, See Fig. 6.
program will remain for only about 20 seconds in the event of power loss. When batteries are first installed, the display will flash 1:00 PM and 32°. When the batteries are low, the display will flash REPL BAT. You have 2030 seconds to replace batteries after removing them from the thermostat. After 20-30 seconds, you will have to reprogram. REPL BAT indication will disappear when the thermostat is mounted back onto the powered subbase.
SET DAY AND TIME Restore 24V power to the thermostat. When power is applied, the display will read 1:00 PM and indicate the room temperature. It will go off for a few seconds, then begin to flash on and off. Set the present day and time. SET Press PRESENT DAY/TIME Press DAY If the display will not come on: — check the mounting of the thermostat to the subbase. If loose or misaligned, remove thermostat and reinstall on the subbase, making sure it is firmly attached.
6 CHECK THERMOSTAT OPERATION Heating should start and the fan should run (there may be a delay of 5-10 minutes before heat turns on). Press COOLER key until the setting is about 10° F [6° C] below room temperature. The heating equipment and fan should shut off. During checkout, the backup heat will come on immediately. During normal operation, the backup heat will come on after a delay.
• • • • on your furnace or air conditioner, it considers (1) air temperature, (2) the temperature of the wall and (3) when you want the comfort temperature established. During Adaptive Intelligent Recovery TM the thermostat increases the control temperature gradually and turns the equipment on and off several times to save energy by avoiding “overshooting” the comfort temperature. See the current control temperature anytime during recovery by pressing the PRESENT SETTING key.
IF ADDITIONAL ASSISTANCE IS NEEDED, PLEASE CONTACT HONEYWELL CUSTOMER ASSISTANCE AT 1-800-468-1502, MONDAY-FRIDAY, 7:00 AM-5:30 PM, CENTRAL TIME. BEFORE YOU CALL, PLEASE HAVE THE FOLLOWING INFORMATION AVAILABLE: TYPE OF HEATING SYSTEM, IGNITION TYPE, WHETHER GAS OR ELECTRIC AIR CONDITIONING, MODEL NUMBER OF OLD THERMOSTAT, NUMBER OF WIRES, AND TERMINAL DESIGNATIONS USED.
Home and Building Control Honeywell Inc. 1985 Douglas Drive North Golden Valley, Minnesota 55422 G.S. 12-93 Home and Building Control Honeywell Limited—Honeywell Limitée 740 Ellesmere Road Scarborough, Ontario M1P 2V9 16 ©Honeywell Inc.
