Honeywell CT8602C Owner's Manual - Page 3
Setting and Adjustments - installation
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Fig. 7-CT8602C heating/cooling circuit in a two transformer (one for heating, one for cooling) system with gas heat and electric cooling, RC and R terminals. Remove factory-installed R-RC jumper. WALLPLATE W G R RC Y 1 L1 (HOT) L2 24V 2 FAN RELAY HEATING PRIMARY CONTROL COOLING CONTACTOR L1 1 (HOT) 24V L2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 PRIMARY CONTROL SUCH AS GAS VALVE OR ELECTRONIC IGNITION MODULE. M118 Fig. 8-CT8602C heating/cooling circuit in an oil heating and electric cooling system. Heating transformer is in oil primary, RC and R terminals. Remove factory-installed R-RC jumper. WALLPLATE 1 L1 (HOT) L2 W G R RC Y TT OIL PRIMARY FAN RELAY COOLING CONTACTOR L1 1 (HOT) 24V L2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M120 Fig. 9-Adjustments. RECOVERY SELECTION ADAPTIVE INTELLIGENT ™ CONVENTIONAL 3A IN (FACTORY SETTING) OUT 1/2 TO 1 TURN Setting and Adjustments ADJUSTING CYCLE RATE NOTE: MOST APPLICATIONS DO NOT REQUIRE A CHANGE IN CYCLE RATE. The room air temperature varies slightly from the comfort temperature setting with the cycling of the furnace or air conditioner. The equipment cycles off and on as the room temperature approaches the setpoint. The cycle rate of this thermostat is set for heating at six cycles per hour and for cooling at three cycles per hour as shipped from the factory. The cooling cycle rate cannot be adjusted. The heating cycle rate can be adjusted by turning one or both cycle rate adjustment screws located on the back of the thermostat. See Fig. 9. Back out the screw about one-half to one turn, or turn in until tight. ADAPTIVE INTELLIGENT RECOVERY™/ CONVENTIONAL RECOVERY The thermostat is factory-set for Adaptive Intelligent Recovery™, but can be converted to conventional recovery using screw 3A on the back of the thermostat as indicated in Fig. 9. With Adaptive Intelligent Recovery™, the room reaches the comfort temperature at the exact time programmed into the thermostat. The control temperature increases gradually, and turns the equipment on and off several times to reach the comfort temperature slowly and on time. There is no wasted energy associated with rapid temperature changes and temperature overshoot. With conventional recovery, program the start time to be earlier than the desired comfort time. It may require some trial and error to arrive at the best starting time. NOTE: If you adjust screw 3A for conventional recovery, an indicator appears in the lower right corner of the thermostat display as a reminder that the Adaptive Intelligent Recovery™ feature is not active. (Fig. 10). Fig. 10-Conventional recovery indicator. PM SET PT TUE LEAVE INDICATES THERMOSTAT IS SET FOR CONVENTIONAL RECOVERY M8878 3A 1A 1B 2A 2B SYSTEM 1A 1B GRAVITY OUT 1/2 OUT 1/2 AIR/WATER TO 1 TURN TO 1 TURN HOT WATER IN OUT 1/2 TO 1 TURN GAS/OIL WARM AIR IN IN (FACTORY SETTING) ELECTRIC OUT 1/2 IN WARM AIR TO 1 TURN TIME/TEMP DISPLAY 2A 2B 24 HR 12 HR IN OUT 1/2 TO 1 TURN oC IN oF OUT 1/2 TO 1 TURN M8857 SETTING TIME/TEMPERATURE The display readout can be converted between a 12 and 24 hour clock or °C and °F using screws 2A and 2B as indicated in Fig. 9. INSTALLING BATTERIES Power is supplied for the thermostat by three AA alka- line batteries. Batteries are included with thermostat. Install batteries in back of thermostat as shown in Fig. 11. The display will flash 1:00 PM and room temperature. When the batteries are going dead, the display will flash REPL BAT. Set system switch to OFF. Remove the thermostat from the wall and install three new AA alkaline batteries. We recommend Energizer® batteries. Change 3 69-0446-2