Honeywell CT3451 Owner's Manual - Page 4

CT3451 PROGRAMMABLE THERMOSTAT THERMOSTAT G Rc R 3 1 L1 (HOT) L2 W Y HEAT RELAY FAN RELAY COMPRESSOR CONTACTOR B O 2 COOL DAMPER 2 HEAT DAMPER TRANSFORMER 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 JUMPER R TO Rc. M20510 Fig. 6. Typical heat-cool system hookup with single transformer. THERMOSTAT G Rc R W B Y O HEATING 1 RELAY AND FAN COIL 24V 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M20536 Fig. 7. Typical heat system hookup with 2-wire, heatonly system. THERMOSTAT G Rc R W B Y O FAN COIL 1 L1 (HOT) L2 COOLIING CONTRACTOR COIL 24V 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M20537 Fig. 8. Typical cool system hookup with 3-wire, cool-only system. THERMOSTAT G Rc R 2 W B Y O 1 L1 (HOT) L2 FAN RELAY 3 COOL DAMPER 3 HEAT DAMPER COMPRESSOR CONTACTOR HEAT RELAY 1 L1 (HOT) L2 COOLING HEATING TRANSFORMER TRANSFORMER 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER SYSTEM. 3 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. M20511 Fig. 9. Typical heat-cool system hookup with two transformers. 69-1620-1 4