User Guide
Page 2
.... • Large, continuously lit display. • Simultaneous display of heat and cool setpoints with excellent temperature control. • Electromechanical. • Classic styling. • Two heat/one cool; Honeywell heat pump thermostats are located on the lower edge of heat pump thermostats. tion for easy checkout. PROGRAMMABLE HEAT PUMP THERMOSTATS T8011 Standard Programmable Thermostat • Microelectronic technology provides precise zero-droop performance. •...
.... • Large, continuously lit display. • Simultaneous display of heat and cool setpoints with excellent temperature control. • Electromechanical. • Classic styling. • Two heat/one cool; Honeywell heat pump thermostats are located on the lower edge of heat pump thermostats. tion for easy checkout. PROGRAMMABLE HEAT PUMP THERMOSTATS T8011 Standard Programmable Thermostat • Microelectronic technology provides precise zero-droop performance. •...
User Guide
Page 4
... and T841A1407, T841A1530, GE AY28Y078 and AY28Y139. Auto fan in EM. HT. 2 1 EM.HT.- HT., COOL CHECKc (continued) 70-6627 • 2 HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Heat Pump Thermostat Model Specifications Table 1. HT. (Fig. 17). for two-stage heating and one -stage cooling. Same as Y594G1419, except Premier White™; HT. (Fig. 18). W2,W3,Y,G, B,O,R,X,E For "No Emergency...
... and T841A1407, T841A1530, GE AY28Y078 and AY28Y139. Auto fan in EM. HT. 2 1 EM.HT.- HT., COOL CHECKc (continued) 70-6627 • 2 HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Heat Pump Thermostat Model Specifications Table 1. HT. (Fig. 17). for two-stage heating and one -stage cooling. Same as Y594G1419, except Premier White™; HT. (Fig. 18). W2,W3,Y,G, B,O,R,X,E For "No Emergency...
User Guide
Page 5
....HT., AUTO- CHECKc COOL SYSTEMb 2 EM.HT.- non-programmable electronic thermostat. G,R,C,L, E,O,B TRADELINE®; Outdoor sensor capability. Outdoor sensor capability. Automatica HEAT-OFFAUTOCOOL 1 EM.-HT.- Fixed anticipation except stage W2,Y,O, 2, which is selectable. (Fig. 29). COOL AUX.HT. Includes T874R1988/Q674L1868. Auto fan in EM.HT. W2,Y,G,R, 2 C,O,B,E,X1, X2,L Same as T8511G1021 except Premier R,C,Y1,W1, 2 White...
....HT., AUTO- CHECKc COOL SYSTEMb 2 EM.HT.- non-programmable electronic thermostat. G,R,C,L, E,O,B TRADELINE®; Outdoor sensor capability. Outdoor sensor capability. Automatica HEAT-OFFAUTOCOOL 1 EM.-HT.- Fixed anticipation except stage W2,Y,O, 2, which is selectable. (Fig. 29). COOL AUX.HT. Includes T874R1988/Q674L1868. Auto fan in EM.HT. W2,Y,G,R, 2 C,O,B,E,X1, X2,L Same as T8511G1021 except Premier R,C,Y1,W1, 2 White...
User Guide
Page 6
... Specifications (continued). COOL PC8900A1007/ TRADELINE®; AUTO- COOL T8611G2028 Same as T8611M2017 except Premier Y1,Y2,W2, 3 White™, 7-day program capability. Automatica HEAT-OFF- W3,G,E,L,R, ...COOL T8611M2025 Same as T8611G2002 except Premier Y1,W1,W2, 2 White™, 7-day program capability. c CHECK LED indicates compressor malfunction. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Table 1. HT. f FAIL LED come on when a complete cirucuit is made on when 24 Vac is running. Order Number Description Terminals Stages Systems Heat Cool...
... Specifications (continued). COOL PC8900A1007/ TRADELINE®; AUTO- COOL T8611G2028 Same as T8611M2017 except Premier Y1,Y2,W2, 3 White™, 7-day program capability. Automatica HEAT-OFF- W3,G,E,L,R, ...COOL T8611M2025 Same as T8611G2002 except Premier Y1,W1,W2, 2 White™, 7-day program capability. c CHECK LED indicates compressor malfunction. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Table 1. HT. f FAIL LED come on when a complete cirucuit is made on when 24 Vac is running. Order Number Description Terminals Stages Systems Heat Cool...
User Guide
Page 7
... • 5 Electromechanical Heat Pump Thermostats T841 Heat Pump Thermostats The T841 models control two-stage heat and one -degree change in heat pump systems, using manual changeover only. cooling anticipator is fixed; When this section also explains some of the heat pump thermostats that Honeywell manufactures. T841B models include up to three LED indicator lights; NOTE: All Honeywell electronic heat pump thermostats are either...
... • 5 Electromechanical Heat Pump Thermostats T841 Heat Pump Thermostats The T841 models control two-stage heat and one -degree change in heat pump systems, using manual changeover only. cooling anticipator is fixed; When this section also explains some of the heat pump thermostats that Honeywell manufactures. T841B models include up to three LED indicator lights; NOTE: All Honeywell electronic heat pump thermostats are either...
User Guide
Page 8
... control. Models include LED indication for weekdays, Saturday, and Sunday; Connect all other terminals as the differential required between stage 1 and stage 2 in either heating or cooling. Using the T8611M on Two-Speed Heat Pump Compressor Equipment The T8611M is a three-stage heat/two-stage cool thermostat used to the low-speed compressor terminal. 2. Connect the Y terminal to control multistage...
... control. Models include LED indication for weekdays, Saturday, and Sunday; Connect all other terminals as the differential required between stage 1 and stage 2 in either heating or cooling. Using the T8611M on Two-Speed Heat Pump Compressor Equipment The T8611M is a three-stage heat/two-stage cool thermostat used to the low-speed compressor terminal. 2. Connect the Y terminal to control multistage...
User Guide
Page 9
...setpoint at the programmed time regardless of heating. * The O terminal is connected to achieve the comfort settings as soon as possible. First stage heat anticipation is selectable. When the thermostat calls for stage 1 heat and stage 1 cool. The Y terminal is energized, ... Relay. In order for homeowner comfort. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Chronotherm IV Electronic Deluxe Heat Pump Thermostats The T8611 Chronotherm IV thermostat models provide up mode in the Chronotherm IV thermostat. Honeywell does not recommend this requirement, a separate...
...setpoint at the programmed time regardless of heating. * The O terminal is connected to achieve the comfort settings as soon as possible. First stage heat anticipation is selectable. When the thermostat calls for stage 1 heat and stage 1 cool. The Y terminal is energized, ... Relay. In order for homeowner comfort. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Chronotherm IV Electronic Deluxe Heat Pump Thermostats The T8611 Chronotherm IV thermostat models provide up mode in the Chronotherm IV thermostat. Honeywell does not recommend this requirement, a separate...
User Guide
Page 10
..., reversing the logic of heating. Equipment Function Power 1st Stage Cool 2nd Stage Cool Fan 1st Stage Heat 2nd Stage Heat Transformer Common Equipment Terminals R Y1 Y2 G W1 W2 C T8611M Terminals R Y2 G W2 C Y Cooling Changeover O B R8222B Relay O M13230 Fig. 3. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Equipment Equipment Function Terminals Power R 1st Stage Cool Y1 2nd Stage Cool Y2 Fan G 1st Stage Heat W1 2nd Stage Heat W2 Transformer Common...
..., reversing the logic of heating. Equipment Function Power 1st Stage Cool 2nd Stage Cool Fan 1st Stage Heat 2nd Stage Heat Transformer Common Equipment Terminals R Y1 Y2 G W1 W2 C T8611M Terminals R Y2 G W2 C Y Cooling Changeover O B R8222B Relay O M13230 Fig. 3. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Equipment Equipment Function Terminals Power R 1st Stage Cool Y1 2nd Stage Cool Y2 Fan G 1st Stage Heat W1 2nd Stage Heat W2 Transformer Common...
User Guide
Page 11
... for proper operation. 70-6627 • 9 Existing Control Equipment Function Terminal Designation Transformer Common C 1st Stage Cooling Y1 1st Stage Heating W1 New Terminal Designation C Y O M13235 Fig. 5. Heat) G G (Fan) Thermostat R8222B Relay Equipment M13232 Fig. 4 Changing fan operation in emergency heat mode for proper operation. Refer to specific types of equipment. Require relay (R8222B1067 typically) for the...
... for proper operation. 70-6627 • 9 Existing Control Equipment Function Terminal Designation Transformer Common C 1st Stage Cooling Y1 1st Stage Heating W1 New Terminal Designation C Y O M13235 Fig. 5. Heat) G G (Fan) Thermostat R8222B Relay Equipment M13232 Fig. 4 Changing fan operation in emergency heat mode for proper operation. Refer to specific types of equipment. Require relay (R8222B1067 typically) for the...
User Guide
Page 14
... Function Terminals Transformer Common C Power R Fan G 1st Stage Cooling Y1 1st Stage Heating W1 Changeover Valve O PC8900 Terminals C R G O/B Y1/W1 2nd Stage Heating W2 Aux. Emergency Heat E E 2nd Stage Cooling Y2 Y2 M13233 Fig. 12. Relay wiring connections for PC8900 in heat pump applications requiring separate Y1 and W1 terminals with a heating changeover. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Equipment Equipment Function...
... Function Terminals Transformer Common C Power R Fan G 1st Stage Cooling Y1 1st Stage Heating W1 Changeover Valve O PC8900 Terminals C R G O/B Y1/W1 2nd Stage Heating W2 Aux. Emergency Heat E E 2nd Stage Cooling Y2 Y2 M13233 Fig. 12. Relay wiring connections for PC8900 in heat pump applications requiring separate Y1 and W1 terminals with a heating changeover. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Equipment Equipment Function...
User Guide
Page 15
... changeover). System monitor relay-optional equipment on the switching subbase. C3-Stage 3 Cooling. Each anticipator is identified and each switch affected is identified by activating the EMERGENCY HEAT LED on some thermostats Each mercury switch is named (EX: H1 anticipator, C1 anticipator). HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Understanding Circuits To understand wiring diagrams, it...
... changeover). System monitor relay-optional equipment on the switching subbase. C3-Stage 3 Cooling. Each anticipator is identified and each switch affected is identified by activating the EMERGENCY HEAT LED on some thermostats Each mercury switch is named (EX: H1 anticipator, C1 anticipator). HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Understanding Circuits To understand wiring diagrams, it...
User Guide
Page 17
... EM. Internal schematic and typical wiring diagram for T841A1308. 70-6627 • 15 HEAT OFF COOL SYSTEM SWITCH 1 POWER SUPPLY. RELAY SYSTEM MONITOR X LACO Y HEAT CHANGEOVER VALVE COMPRESSOR CONTACTOR O COOL CHANGEOVER VALVE CHP M6060A Fig. 16. LED (GREEN) E L EM. HT. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Typical System Hookup Diagrams L1 L2 (HOT) RTD 1 1 ODT...
... EM. Internal schematic and typical wiring diagram for T841A1308. 70-6627 • 15 HEAT OFF COOL SYSTEM SWITCH 1 POWER SUPPLY. RELAY SYSTEM MONITOR X LACO Y HEAT CHANGEOVER VALVE COMPRESSOR CONTACTOR O COOL CHANGEOVER VALVE CHP M6060A Fig. 16. LED (GREEN) E L EM. HT. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Typical System Hookup Diagrams L1 L2 (HOT) RTD 1 1 ODT...
User Guide
Page 19
...HT. AUTO OFF C815A OUTDOOR THERMISTOR T FAN RELAY G CHANGEOVER VALVE O R X2 OUTDOOR THERMOSTAT W AUX. HT. LED (RED) F AUX. HT. R L1 (HOT) L2 1 X Y1 COMPRESSOR CONTACTOR O COOL CHANGEOVER VALVE M6068A Fig. 19. HT. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. ...-6627 • 17 Internal schematic and typical wiring diagram for T841B1000. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE H1/C1 ANTICIPATOR H1 C1 FALL FAN SWITCH AUTO ON W1 HEAT RELAY 1 W2 HEAT RELAY 2 B HEAT CHANGEOVER VALVE G FAN RELAY H2 ANTICIPATOR H2 FALL SYSTEM SWITCH...
...HT. AUTO OFF C815A OUTDOOR THERMISTOR T FAN RELAY G CHANGEOVER VALVE O R X2 OUTDOOR THERMOSTAT W AUX. HT. LED (RED) F AUX. HT. R L1 (HOT) L2 1 X Y1 COMPRESSOR CONTACTOR O COOL CHANGEOVER VALVE M6068A Fig. 19. HT. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. ...-6627 • 17 Internal schematic and typical wiring diagram for T841B1000. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE H1/C1 ANTICIPATOR H1 C1 FALL FAN SWITCH AUTO ON W1 HEAT RELAY 1 W2 HEAT RELAY 2 B HEAT CHANGEOVER VALVE G FAN RELAY H2 ANTICIPATOR H2 FALL SYSTEM SWITCH...
User Guide
Page 20
... Y594G1633. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE FALL 1 H1 ANTICIPATOR 2 H1 4 6 H2 ANTICIPATOR H2 FALL RISE 8 C1 9 C1 ANTICIPATOR 10 11 RISE CO 12 FAN SWITCH AUTO ON SYSTEM SWITCH OFF EM. HT. LED (RED) X COOL CHANGEOVER VALVE O B W1 RELAY W1 HEAT CHANGEOVER VALVE 2 COMPRESSOR CONTACTOR Y1 1 POWER SUPPLY. HT. HT. HEAT AUTO COOL O COOL CHANGEOVER...
... Y594G1633. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE FALL 1 H1 ANTICIPATOR 2 H1 4 6 H2 ANTICIPATOR H2 FALL RISE 8 C1 9 C1 ANTICIPATOR 10 11 RISE CO 12 FAN SWITCH AUTO ON SYSTEM SWITCH OFF EM. HT. LED (RED) X COOL CHANGEOVER VALVE O B W1 RELAY W1 HEAT CHANGEOVER VALVE 2 COMPRESSOR CONTACTOR Y1 1 POWER SUPPLY. HT. HT. HEAT AUTO COOL O COOL CHANGEOVER...
User Guide
Page 21
... wiring diagram for Y594R1797. HEAT OFF R L EM. HEAT RELAY W2 FAN RELAY G COOL CHANGEOVER VALVE O COOL E COMPRESSOR EM. HEAT CONTACTOR RELAY Y "B" RELAY B 1 POWER SUPPLY. Fig. 24. HEAT LED (RED) G FAN RELAY W 2 U AUX. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. L1 (HOT) L2 1 M8700 70-6627 • 19 HEAT LED (GRN) AUX. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE...
... wiring diagram for Y594R1797. HEAT OFF R L EM. HEAT RELAY W2 FAN RELAY G COOL CHANGEOVER VALVE O COOL E COMPRESSOR EM. HEAT CONTACTOR RELAY Y "B" RELAY B 1 POWER SUPPLY. Fig. 24. HEAT LED (RED) G FAN RELAY W 2 U AUX. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. L1 (HOT) L2 1 M8700 70-6627 • 19 HEAT LED (GRN) AUX. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE...
User Guide
Page 22
O COOL CHANGEOVER VALVE L COMPRESSOR MONITOR FAN RELAY G R EM. HT. HT. LED (GRN) W2 AUX. RELAY X 3 X2 HEAT CHANGEOVER VALVE B W1 RELAY W1 2 COMPRESSOR CONTACTOR Y L1 (HOT) L2 1 M8713 Fig. 25. PROVIDE DISCONNECT MEANS AND OVERLOAD ...JUMPER. RELAY E EM. HT. LED (RED) AUX. HT. Internal schematic and typical wiring diagram for Y594R1425. 70-6627 • 20 HEAT OFF COOL 11 1 POWER SUPPLY. HT. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE W3 W3 RELAY H1 ANTICIPATOR 1 C ANTICIPATOR 2 FAN SWITCH AUTO ON H1 3 C FALL 4 5 H2 ANTICIPATOR H2...
O COOL CHANGEOVER VALVE L COMPRESSOR MONITOR FAN RELAY G R EM. HT. HT. LED (GRN) W2 AUX. RELAY X 3 X2 HEAT CHANGEOVER VALVE B W1 RELAY W1 2 COMPRESSOR CONTACTOR Y L1 (HOT) L2 1 M8713 Fig. 25. PROVIDE DISCONNECT MEANS AND OVERLOAD ...JUMPER. RELAY E EM. HT. LED (RED) AUX. HT. Internal schematic and typical wiring diagram for Y594R1425. 70-6627 • 20 HEAT OFF COOL 11 1 POWER SUPPLY. HT. HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE W3 W3 RELAY H1 ANTICIPATOR 1 C ANTICIPATOR 2 FAN SWITCH AUTO ON H1 3 C FALL 4 5 H2 ANTICIPATOR H2...
User Guide
Page 23
... (RED) R C/X AUX. LED (GREEN) L HEAT 2 MONITOR W2 AUX. HT. HEAT OFF AUTO COOL C. B HEAT CHANGEOVER VALVE HIGH LIMIT HEAT 1 1 POWER SUPPLY. Typical wiring diagram for T8611G1004 and T8611G1103. L1 (HOT) L2 1 70-6627 • 21 HT. COOL CHANGEOVER VALVE O COOL C. HT. O. HT. HT. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 DENOTES THERMOSTAT TO SUBBASE INTERCONNECT. Y X1 3 CHECK...
... (RED) R C/X AUX. LED (GREEN) L HEAT 2 MONITOR W2 AUX. HT. HEAT OFF AUTO COOL C. B HEAT CHANGEOVER VALVE HIGH LIMIT HEAT 1 1 POWER SUPPLY. Typical wiring diagram for T8611G1004 and T8611G1103. L1 (HOT) L2 1 70-6627 • 21 HT. COOL CHANGEOVER VALVE O COOL C. HT. O. HT. HT. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 DENOTES THERMOSTAT TO SUBBASE INTERCONNECT. Y X1 3 CHECK...
User Guide
Page 24
... 1 1 POWER SUPPLY. HT. RELAY E SYSTEM SWITCH EM. HEAT OFF AUTO COOL COOL 1 FAN RELAY G COOL CHANGEOVER C. VALVE O C. ROUTE INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE. HT. HT. O. RELAY W3 HEAT 3 STAGE 2 RELAY W2 HEAT 2 EM. O. Typical wiring diagram for T8611M7008. HT. HT....OF SYSTEM TRANSFORMER SWITCH IN SECONDARY OF SEPARATE TRANSFORMER 3 SOME OLDER HEAT PUMP THERMOSTATS USE X FOR COMMON TERMINAL. 4 NOMINAL 24 VAC POWER MUST BE PRESENT BETWEEN R AND C TERMINALS FOR THERMOSTAT OPERATIONS. 5 AVAILABLE ONLY ON MODLES WITH SEPARATE SENSOR FOR REMOTE ...
... 1 1 POWER SUPPLY. HT. RELAY E SYSTEM SWITCH EM. HEAT OFF AUTO COOL COOL 1 FAN RELAY G COOL CHANGEOVER C. VALVE O C. ROUTE INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE. HT. HT. O. RELAY W3 HEAT 3 STAGE 2 RELAY W2 HEAT 2 EM. O. Typical wiring diagram for T8611M7008. HT. HT....OF SYSTEM TRANSFORMER SWITCH IN SECONDARY OF SEPARATE TRANSFORMER 3 SOME OLDER HEAT PUMP THERMOSTATS USE X FOR COMMON TERMINAL. 4 NOMINAL 24 VAC POWER MUST BE PRESENT BETWEEN R AND C TERMINALS FOR THERMOSTAT OPERATIONS. 5 AVAILABLE ONLY ON MODLES WITH SEPARATE SENSOR FOR REMOTE ...
User Guide
Page 25
... and T8411R. 70-6627 • 23 HT. RELAY E STAGE 1 HEAT RELAY W1 FAN RELAY G COOL 1 HEAT 1 O 2 COOL CHANGEOVER VALVE B HEAT CHANGEOVER VALVE Y1 COMPRESSOR CONTACTOR P 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 REMOVE JUMPER FOR SYSTEM WITH ISOLATED STAGE 1 HEATING AND COOLING CONNECTIONS. 3 DENOTES THERMOSTAT TO SUBBASE INTERCONNECT. HEAT OFF COOL HIGH LIMIT HIGH LIMIT EM. M11333 Fig. 29...
... and T8411R. 70-6627 • 23 HT. RELAY E STAGE 1 HEAT RELAY W1 FAN RELAY G COOL 1 HEAT 1 O 2 COOL CHANGEOVER VALVE B HEAT CHANGEOVER VALVE Y1 COMPRESSOR CONTACTOR P 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 REMOVE JUMPER FOR SYSTEM WITH ISOLATED STAGE 1 HEATING AND COOLING CONNECTIONS. 3 DENOTES THERMOSTAT TO SUBBASE INTERCONNECT. HEAT OFF COOL HIGH LIMIT HIGH LIMIT EM. M11333 Fig. 29...
User Guide
Page 26
... MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 O/B IS FIELD CONFIGURABLE TO SELECT ENERGIZED IN HEATING OR COOLING. (DEFAULT IS ENERGIZED IN HEATING). 3 REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPARATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y1). HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE L1 1 (HOT) L2 R THERMOSTAT LOGIC POWER SUPPLY W2 W1 E Y1 G O/B W2 W1 C COMPRESSOR CONTACTOR...
... MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 O/B IS FIELD CONFIGURABLE TO SELECT ENERGIZED IN HEATING OR COOLING. (DEFAULT IS ENERGIZED IN HEATING). 3 REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPARATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y1). HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE L1 1 (HOT) L2 R THERMOSTAT LOGIC POWER SUPPLY W2 W1 E Y1 G O/B W2 W1 C COMPRESSOR CONTACTOR...