Honeywell T841, T8411, Y594, T8511, T8611 User Manual

...

Heat Pump

Thermostat

Cross Reference Selection Guide

Select a Honeywell Heat Pump Thermostat for Peak Performance that Meets Every Heat Pump Demand

Rapid advances in heat pump technology, resulting in high efficiency units and lower operating costs, have made the heat pump a popular choice with consumers. Honeywell heat pump thermostats are ideal for all your heat pump applications and provide the highest level of comfort available. Our thermostats offer consistent control. They optimize desired comfort level and energy savings. Because your customers’ needs vary, we’ve developed the most complete line of heat pump thermostats.

NON-PROGRAMMABLE HEAT PUMP THERMOSTATS

T841 Standard Non-Programmable Thermostat

• Good performance without any “frills”.

• Electromechanical.

• Two heat/one cool; manual changeover.

• Single-piece construction–no subbase required.

• Front test probe access for easy checkout.

Y594 Deluxe Non-Programmable Thermostat

• Proven reliability with excellent temperature control.

• Electromechanical.

• Classic styling.

• Two heat/one cool; automatic or manual changeover.

• Two-piece, front-wired construction for easy installation.

T8411 Standard Electronic Non-Programmable Thermostat

• Microelectronic technology provides precise zero-droop performance.

• Attractive styling complements any décor.

• Two heat/one cool; manual changeover eliminates unexpected system operation.

• Large digital display for quick, easy readability.

• Fan and system switches are located on the lower edge of the thermostat to eliminate accidental setting changes.

T8511 Deluxe Electronic Non-Programmable Thermostat

• Microelectronic technology provides precise zero-droop performance.

• Attractive styling complements any décor.

• Two heat/one cool; automatic or manual changeover.

• Easy-to-read backlit display.

• Most frequently used keys are located by LCD for quick and easy access to information.

• Outdoor temperature display available with optional outdoor temperature sensor.

PROGRAMMABLE HEAT PUMP THERMOSTATS

T8011 Standard Programmable Thermostat

• Microelectronic technology provides precise zero-droop performance.

• Attractive styling complements any décor.

• Two heat/one cool; manual changeover.

• Program up to four time periods and temperature setpoints.

• Large temperature display for quick, easy readability.

• Conveniently sized thermostat with two-piece installation make it easy to install and troubleshoot.

PC8900/W8900B1002 Perfect Climate Comfort Center™ Control System

• Automated, all-in-one comfort control.

• PC8900 Control Panel mounts in living space and accurately measures and controls room temperature and humidity. W8900 Remote Panel mounts near the heating and cooling equipment.

• Optional remote sensors can be used for optimum temperature control.

• Up to three heat/two cool.

• Seven-day (auto copy) programming.

• Large, continuously lit display.

• Simultaneous display of heat and cool setpoints with push of a button.

• Circulation fan setting improves indoor air quality.

T8611 Chronotherm® IV Deluxe Programmable Thermostat

• Microelectronic technology provides precise zero-droop performance.

• Attractive styling complements any décor.

• Two heat/one cool; automatic or manual changeover.

• Seven-day programming.

• COPY key makes programming easier for the installer and the homeowner.

• Easy-to-read backlit display.

• Adaptive Intelligent Recovery™ optimizes heat pump energy savings.

• Outdoor temperature display available with optional outdoor temperature sensor.

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Table of Contents

About This Cross Reference/Selection Guide Heat Pump Thermostat Model Specifications Thermostat Descriptions and General Information Understanding Circuits Typical System Hookup Diagrams Electronic Thermostat (T8011, T8411, T8511, T8611) Sequences of Operation Thermostat Manufacturer Cross Reference Tips for Using This Heat Pump Cross Reference Wiring Connections for Honeywell Heat Pump Thermostats Manufacturer Cross Reference Index

.......................................................................................................................................................................................

Index to Figure Diagrams

............................................................................................................................................................

..........................................................................................................................................

...............................................................................................................................................

........................................................................................................................................................

........................................................................................................................

.........................................................................................................................

.................................................................................................................

...................................................................

............................................................................................................................

...................................................................................................................

..................................................................................................

About This Cross Reference/Selection Guide

2-4

5-12 13-14 15-25 26-28 29-32

34-35

36-116

117-118

119

Heat pumps require thermostats with special features. This Cross Reference/Selection Guide contains information about all aspects of selecting a Honeywell replacement thermostat for any heat pump application. Table 1 shows a list of the Honeywell TRADELINE® and SUPER TRADELINE® OS numbers and their specifications. Immediately following the table are more detailed descriptions and related application information. In this section you will find additional information explaining features and requirements that are unique to heat pump thermostat applications. Following the general information section are the internal schematics, wiring diagrams, and sequence of operation information for the electronic thermostats. The Thermostat Manufacturer Cross Reference is listed next. Finally, there is the heat pump manufacturer cross reference, including tips on how to use it. This cross reference, which is organized alphabetically by equipment or thermostat manufacturer, provides the needed information to select and wire any Honeywell heat pump thermostat in new installations and replacement applications.

70-6627 • 1

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Heat Pump Thermostat Model Specifications

Table 1. Model Number Specifications.

Order

Number

T841A1308 TRADELINE®; fixed anticipation. For

use where E and W2 may be jumpered. No auto fan in EM.HT. (Fig. 16).

T841A1555 Replaces T841A1068 and T841A1407,

T841A1530, GE AY28Y078 and AY28Y139. Includes outdoor reset and fixed anticipation on stage 2 heat. Auto fan in EM. HT. (Fig. 17).

T841A1712 SUPER TRADELINE®; for two-stage

heating and one-stage cooling. Fixed anticipation except Stage 2, which is adjustable. Auto fan in EM. HT. (Fig. 18).

T841A1738 Same as T841A1712, except Premier

White™. SUPER TRADELINE®; for two-stage heating and one-stage cooling. Fixed anticipation except Stage 2, which is adjustable. Auto fan in EM. HT. (Fig. 18).

T841B1000 For “No Emergency Heat” applications.

Fixed anticipation except stage 2, which is adjustable. (Fig. 19).

Y594G1161 Includes T874G1204/Q674J1043. With

outdoor reset; replaces GE AY28X077 and AY28X138; no stage 2 heat anticipation. No auto fan in EM. HT. (Fig. 20).

Y594G1419 SUPER TRADELINE®; includes

T874G1642/Q674F1444. Auto fan in EM. HT. (Fig. 22).

Y594G1476 Same as Y594G1419, except Premier

White™; SUPER TRADELINE®. Includes T874G1741/Q674F1477. Auto fan in EM. HT. (Fig. 22).

Y594G1633 TRADELINE®; includes T874G1972/

Q674F1584. No auto fan in EM.HT. Replaces Coleman/Evcon Y594G1377 (Fig. 21).

Y594R1425 SUPER TRADELINE®; includes

T874R1616/Q674L1587. Fixed anticipation. Auto fan in EM. HT. (Fig. 25).

Description Terminals Heat Cool

W2,Y,G,R,

O,B,L,E,X

W,Y,G,R,O,

B,X2,T,F,U

W2,W3,Y,G,

B,O,R,X,E

W2,W3,Y,G,

B,O,R,X,E

W1,W2,Y1,

G,R,O,B,X

W,Y,G,R,O,

X2,T,F,B

W1,W2,W3,

Y1,G,R,O,B,

E,X,X1,X2

W1,W2,W3,

Y1,G,R,O,B,

E,X,X1,X2

W2,Y,G,R,

O,B,E,X,L

W1,W2,W3,

G,Y,R,O,B,

E,X,X2,L

Stages

2 1 EM.HT.-

2 1 HEAT-OFF-

2 1 EM.HT.-

2 1 OFF-

2 1 EM. HT.-

Systems Led

Switch

HEAT-OFF-

COOL

HEAT-OFF-

COOL

HEAT-OFF-

COOL

HEAT-OFF-

COOL

AUTO-OFF

EM.HT.

HEAT-

AUTO-

COOL

EM.HT.

HEAT-

AUTO-

COOL

EM.HT.

HEAT-

AUTO-

COOL

HEAT-OFF-

COOL

Changeover

Manual heat

or cool

Manual cool EM.HT.,

Manual heat

or cool

Manual heat

or cool

Manual heat

or cool

Auto cool AUX.HT.,

Auto heat

or cool

Auto heat

or cool

Auto heat

or cool

Manual heat

or cool

Indication

EM.HT.d,

AUX.HT.

AUX. HT.

EM.HT.,

AUX. HT.

EM.HT.,

AUX. HT.

None

EM.HT.

EM.HT., AUX.HT. CHECK

EM.HT., AUX.HT.

AUX. HT.,

EM. HT., CHECK

(continued)

70-6627 • 2

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Table 1. Model Number Specifications (continued).

Order

Number

Y594R1763 TRADELINE®; includes

T874R1954/Q674L1827. Replaces Y594R1136. Auto fan in EM.HT. (Fig. 23).

Y594R1797 Includes T874R1988/Q674L1868.

Replaces Coleman/Evcon Y594R1235. No auto fan in EM.HT. (Fig. 24).

T8611G1004 TRADELINE®; 5-1-1 programming.

Auto fan in EM.HT. (Fig. 26).

T8611G1103 Same as T8611G1004, except Premier

White™; TRADELINE®. 5-1-1 programming. Auto fan in EM.HT. (Fig. 26).

T8611M7008 TRADELINE®; 7 day programming.

Auto fan in EM.HT. (Fig. 27).

T8611R1000 TRADELINE®; 5-1-1 programming.

Auto fan in EM.HT. (Fig. 28).

T8411R1002 TRADELINE®; non-programmable

electronic thermostat. Auto fan in EM.HT. (Fig. 29).

T8411R1028 Same as T8411R1002 except Premier

White™. Auto fan in EM.HT. (Fig. 29).

T8511G1021 TRADELINE®; Deluxe Electronic

Thermostat. Outdoor sensor capability. Auto fan in EM.HT. (Fig. 30).

T8511G1047 Same as T8511G1021 except Premier

White™. Outdoor sensor capability. Auto fan in EM.HT. (Fig. 30).

T8511M1002 TRADELINE®; Deluxe Electronic

Thermostat. Outdoor sensor capability. Auto fan in EM.HT.

T8011R1006 Same as T8011R1014 except Premier

White™. Fixed anticipation except stage 2, which is selectable. (Fig. 29).

T8011R1014 TRADELINE®; program up to four time

periods and temperatures. Fixed anticipation except stage 2, which is selectable. (Fig. 29).

Description Terminals Heat Cool

W,Y,G,R,O,

B,X2,T,F,U

W2,Y,G,R,

O,B,X,E,L

W2,Y,G,R,

C,O,B,E,X1,

X2,L

W2,Y,G,R,

C,O,B,E,X1,

X2,L

W2,W3,Y,Y2,

G,R,C,O,B,

E,X1,X2,L

W1,W2,Y1, G,R,C,O,B,

E,L,P

W1,W2,Y,

G,R,C,L,

E,O,B

W1,W2,Y,

G,R,C,L,

E,O,B

R,C,Y1,W1,

W2,O/B,G, E,L,OT,OT

R,C,Y1,W1,

W2,O/B,G, E,L,OT,OT

R,C,Y1,Y2,

W2,W3,O/B,

G,E,L,OT,OT

R,C,G,W1,

W2,Y,O,

B,E,L

R,C,G,W1,

W2,Y,O,

B,E,L

Stages

Systems Led

Switch

2 1 EM.HT.-

HEAT-OFF-

COOL

AUX.HT.

2 1 EM.HT.-

HEAT-OFF-

COOL

2 1 EM.HT.-

HEAT-OFF-

AUTO-

COOL

2 1 EM.HT.-

HEAT-OFF-

AUTO-

COOL

3 2 EM.HT.-

HEAT-OFF-

AUTO-

COOL

2 1 EM.HT.-

HEAT-OFF-

COOL

2 1 EM.-HT.-

HEAT-OFF-

COOL

2 1 EM.-HT.-

HEAT-OFF-

COOL

2 1 EM.-HT.-

HEAT-OFF-

AUTO-

COOL

2 1 EM.-HT.-

HEAT-OFF-

AUTO-

COOL

3 2 EM.-HT.-

HEAT-OFF-

AUTO-

COOL

2 1 EM.-HT.-

HEAT-OFF-

COOL

2 1 EM.-HT.-

HEAT-OFF-

COOL

Changeover

Indication

Manual cool EM.HT.,

AUX.HT.

Manual cool EM.HT.,

AUX.HT.

Automatic

EM.HT.,

AUX. HT.,

CHECK

SYSTEM

Automatic

EM.HT.,

AUX.HT.,

CHECK

SYSTEM

Automatic

EM.HT.,

AUX.HT.,

CHECK

SYSTEM

Manual EM.HT.d,

AUX.HT.

SYSTEM

Manual None

Automatic

CHECKc

Manual None

(continued)

70-6627 • 3

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Table 1. Model Number Specifications (continued).

Order

Number

T8611G2002 TRADELINE®; Full seven-day program

capability. Programmable fan and back lighting features. (Fig. 31).

Description Terminals Heat Cool

Y1,W1,W2,

G,E,L,R,C,

O/B,X1,X2,

OT,OT

T8611G2028 Same as T8611G2002 except Premier

White™, 7-day program capability. Programmable fan and back lighting features. (Fig. 31).

T8611M2017 TRADELINE®; full 7-day program

capability. Programmable fan and back lighting features.

Y1,W1,W2,

G,E,L,R,C,

O/B,X1,X2,

OT,OT

Y1,Y2/W2, W3,G,E,L,

R,O/B,C,X1,

X2,OT,OT

T8611M2025 Same as T8611M2017 except Premier

White™, 7-day program capability. Programmable fan and back lighting features.

PC8900A1007/ W8900B1002

TRADELINE®; Perfect Climate Comfort Center™ Control System. 7-day (auto copy) programming.

Y1,Y2,W2,

W3,G,E,L,R,

O/B,C,X1, X2,OT,OT

R,C,RH,Y1/

W1,G,O/B, AUX,E,Y2,

W2,L

n freezing climates, be sure the cooling compressor has adequate cold start protection.

SYSTEM LED lights when heating or cooling equipment is running.

CHECK LED indicates compressor malfunction.

EM. HT. LED indicates compressor malfunction.

CHECK LED comes on when 24 Vac is applies to the L terminal.

FAIL LED come on when a complete cirucuit is made on the X1 and X2 terminals.

CHECK LED lights to alert homeowner to HVAC maintenance or service needs.

Stages

Systems Led

Switch

2 1 EM.HT.-

HEAT-OFF-

AUTO-

COOL

2 1 EM.HT.-

HEAT-OFF-

AUTO-

COOL

3 2 EM.HT.-

HEAT-OFF-

AUTO-

COOL

3 2 EM.HT.-

HEAT-OFF-

AUTO-

COOL

3 2 EM.HT.-

HEAT-OFF-

AUTO-

COOL

Changeover

Automatic

Indication

CHECK

FAIL

CHECK

FAIL

CHECK

FAIL

CHECK

FAIL

CHECK

SYSTEM

70-6627 • 4

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Thermostat Descriptions and General Information

This section describes some of the heat pump thermostats that Honeywell manufactures. Since heat pumps require thermostats with special features such as control of changeover valves, this section also explains some of the features and requirements unique to heat pump thermostat applications.

Electromechanical Heat Pump Thermostats

T841 Heat Pump Thermostats

The T841 models control two-stage heat and one-stage cool in heat pump systems, using manual changeover. Heat anticipators are either adjustable or fixed; cooling anticipator is fixed. T841A models include up to three LED indicator lights; T841B models include up to two LED indicator lights. Provision for an outdoor reset to improve thermal performance is also available on select models.

Y594 Combination Packs for Heat Pump Applications

The Y594 Packs combine the appropriate T874 Multistage Thermostat and the Q674 Subbase for specific heat pump applications. Y594G models have automatic changeover; Y594R model has manual changeover. Heat anticipators are either adjustable or fixed; cooling anticipator is fixed. Accessories include tamper-resistant cover and locking lever assembly with thermometer, locking lever stops, outdoor thermistor, TG504 Key Lock® Cover, and the TG511 Versaguard™ Universal Thermostat Guard.

Outdoor Reset

Some heat pump thermostats apply outdoor reset to minimize the effect of the interstage differential. It takes more than a one-degree change in temperature to initiate the second stage of heating. Added to a certain amount of droop under high loads, there can be a fairly large offset between the setpoint temperature and the room temperature. To correct this difference, an outdoor thermistor is used.

In warm weather, the outdoor thermistor has a very low resistance, permitting a large amount of current to flow in the heater. This reduces the call for second stage heating.

In cool weather, the outdoor thermistor has a very high resistance, permitting a small amount of current to flow in the heater. When this happens, calls for second stage heating are more frequent. This helps reduce the difference between the setpoint temperature and the room temperature.

Select one of the following T841 or Y594 models if a thermostat with outdoor reset capability is required:

T841A1555 Y594G1161

Y594R1763 If an outdoor thermistor is not provided, use the Honeywell C815A Outdoor Thermistor, ordered separately. NOTE: All Honeywell

electronic

heat pump thermostats are droopless controls and do not require the use of outdoor reset.

Electronic Non-programmable Heat Pump Thermostats

T8411 Electronic Heat Pump Thermostats

The T8411 models control two-stage heat and one-stage cool in heat pump systems, using manual changeover only. First stage heat anticipation is fixed; second stage heat anticipation is selectable at 3, 6, or 9 cph. Setpoints are permanently held in memory (no batteries required) and retained during power failures. Electronic thermostats provide droopless temperature control.

70-6627 • 5

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

T8511 Deluxe Electronic Heat Pump Thermostats

The T8511 models control two-stage heat and one-stage cool in heat pump systems, using manual or automatic changeover. First stage heat anticipation is fixed; second stage heat anticipation is selectable at 3, 6, or 9 cph. Setpoints are permanently held in memory (no batteries required) and retained during power failures. Electronic thermostats provide droopless temperature control. The T8511 models also include a backlit display and outdoor sensing capability.

Electronic Programmable Heat Pump Thermostats

T8011 Standard Electronic Heat Pump Thermostats

The T8011 models provide two-stage heat and one-stage cool control for heat pump systems, using manual changeover. First stage heat anticipation is fixed; second stage heat anticipation is selectable at 1, 3, 6, or 9 cph. The user can program up to four time periods and temperature setpoints. All programs and setpoints are permanently held in memory in the event of a power outage. Electronic thermostats provide droopless temperature control.

Chronotherm® III Electronic Heat Pump Thermostats

The T8611 Chronotherm III models provide up to three-stage heat and two-stage cool control for heat pump systems, using manual or automatic changeover. Models are available with selectable daily schedules for weekdays, Saturday, and Sunday; or full 7-day programming. Models include LED indication for system operation and status. Battery backup, with low battery indication, maintains clock and memory during power outages. Adjustable second stage cycling allows for use of the thermostat with electric heat or fossil fuel while providing optimum comfort.

Using the Chronotherm III or Chronotherm IV T8611M on Two-Speed Heat Pump Compressor Equipment

The T8611M is a three-stage heat/two-stage cool thermostat used to control multistage heat pump equipment. However, there is no difference in controlling multistage equipment and in controlling two-speed multistage equipment. The differential required between stage 1 and stage 2 in multistage equipment is the same as the differential required between low-speed and high-speed in two-speed equipment.

To connect the T8611M to two-speed heat pump equipment:

1. Connect the Y terminal to the low-speed compressor terminal.

2. Jumper the Y2 and W2 terminals.

3. Connect the Y2 terminal to the high-speed compressor terminal.

4. Connect all other terminals as shown in the wiring diagram below.

5. Configure the O/B terminal for changeover in either heating or cooling.

Equipment Function

Transformer Common

Power

Cooling Changeover Heating Changeover

1st Stage Compressor

2nd Stage Compressor

Fan

Equipment Terminals

C C

RR GG OO or BB or YY

Y2 Y2

T8611M

Terminals

O/B

70-6627 • 6

Third Stage Heat

Emergency Heating

Fig. 1. Using the T8611M on two-speed heat pump compressor equipment.

On selected T8611M models, the high speed compressor is wired to the Y2 terminal. In these cases, no jumper is required.

W3 W3

M13229

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Chronotherm IV Electronic Deluxe Heat Pump Thermostats

The T8611 Chronotherm IV thermostat models provide up to three-stage heat and two-stage cool control for heat pump systems, using manual or automatic changeover. These models provide full 7-day programming capability. Models with programmable fan operation are available for homeowner comfort. Backlighting on the large display makes the LCD very easy to read. Adaptive Intelligent Recovery™ control brings the room temperature to the desired temperature setpoint at the programmed time, maximizing comfort and energy savings. First stage heat anticipation is fixed; second stage heat anticipation is selectable.

Adaptive Intelligent Recovery™ Control (Night Setback and Heat Pumps)

Heat pump applications are ideal for night setback and energy savings. However, in order to maximize the energy saved in a night setback mode, use the T8611 Chronotherm® III or T8611 Chronotherm® IV Thermostats with Adaptive Intelligent Recovery™ control.

Adaptive Intelligent Recovery™ control assures that the comfort setting is achieved at the programmed time regardless of weather conditions. Conventional recovery starts recovery at the beginning of the programmed time period and uses the equipment to achieve the comfort settings as soon as possible.

Unlike the Chronotherm mode in the Chronotherm IV thermostat. Honeywell does not recommend this because the auxiliary heat comes on when the program time begins, and runs continuously until the setpoint is reached.

III models, the Adaptive Intelligent Recovery control can be turned off in the Installer Set-up

Applications Requiring Special System Hookups

Using a Chronotherm III T8611G or T8611M on Systems Requiring Separate W1 and Y Terminals

The Chronotherm III T8611G and T8611M are designed with only one common compressor terminal. The Y terminal is energized on a call for stage 1 heat and stage 1 cool. However, some multistage heat pump equipment requires one terminal to be energized on a call for stage 1 heat (W In order for the T8611G or T8611M to accommodate this requirement, a separate switching relay must be added to the installation. See the following wiring diagrams for heat pumps that provide changeover in the heating mode and for heat pumps that provide changeover in the cooling model.

Heat Pumps with Heating Mode Changeover

Here is how the switching relay allows the system to work properly: * The Y terminal is connected to the equipment terminal W1 through the normally closed contacts on the R8222B

Switching Relay. When the thermostat calls for heat, the thermostat Y terminal activates the first stage of heating.

* The O terminal is connected to the coil terminals on the R8222B Switching Relay. When the system switch is in the

COOL position, the O terminal is energized, reversing the logic of the Chronotherm III T8611G and T8611M Y terminal. Now when the thermostat calls for cooling, the Y terminal activates the first stage of cooling.

) and one terminal to be energized on a call for stage 1 cool (Y1).

70-6627 • 7

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Fan

Equipment

Terminals

RR Y1 Y2 Y2

GG W1 W2 W2

Equipment Function

Power

1st Stage Cool

2nd Stage Cool

1st Stage Heat

2nd Stage Heat

Transformer Common

Heating Changeover

Fig. 2. Installing an R8222B Switching Relay on heat pumps requiring heating mode changeover.

Heat Pumps with Cooling Mode Changeover

Here is how the switching relay allows the system to work properly: * The Y terminal is connected to the equipment terminal Y1 through the normally closed contacts on the R8222B

Switching Relay. When the thermostat calls for cooling, the thermostat Y terminal activates the first stage of cooling.

T8611M

Terminals

R8222B Relay

M13231

* The B terminal is connected to the coil terminals of the R8222B Switching Relay. When the system switch is in the

HEAT position, the B terminal is energized, reversing the logic of the Chronotherm® III T8611G and T8611M Y terminal. Now when the thermostat calls for heating, the Y terminal activates the first stage of heating.

Equipment Function

Power

1st Stage Cool

2nd Stage Cool

Fan

1st Stage Heat

2nd Stage Heat

Transformer Common

Cooling Changeover

Equipment

Terminals

RR Y1 Y2 Y2

W1 W2 W2

R8222B Relay

T8611M

Terminals

M13230

70-6627 • 8

Fig. 3. Installing an R8222B Switching Relay on heat pumps requiring cooling mode changeover.

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Changing Fan Operation in Emergency Heat Mode for Electronic Thermostats

In the emergency heat mode (system switch in EM. HT. position), the thermostat controls the fan operation with a call for first stage heat. This means that when the thermostat calls for heat, the thermostat also calls for fan operation. However, this fan operation is not desirable on some types of systems.

To change the fan operation on the TRADELINE and SUPER TRADELINE models, follow the wiring diagram shown below. Connecting the thermostat and relay to the equipment in this manner disables the fan switch in the emergency heat mode. During normal operation, the fan switch is enabled and the fan operation is as described in the installation instructions.

R (Power)

E C (Common)

E (EM. Heat)

G G (Fan)

Thermostat

Fig. 4 Changing fan operation in emergency heat mode for electronic thermostats.

R8222B Relay

Equipment

M13232

Heat Pump Manufacturer Relay Wiring Connections

The wiring connections for some thermostats to specific types of heat pump equipment require a separate relay for proper operation. Refer to Fig. 5 through 13 for the wiring connections of these types of equipment.

Equipment Function

Transformer Common

1st Stage Cooling

1st Stage Heating

Existing Control

Terminal Designation

New T erminal

Designation

M13235

Fig. 5. Relay wiring connections for Carrier equipment (typical 38BQ), and T8511M, T8611M,

PC8900/W8900B1002. Require relay (R8222B1067 typically) for proper operation.

70-6627 • 9

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Equipment Function

Common

Power

Existing Control

Terminal Designation

Black

Red

New T erminal

Designation

Emergency Heat

M13241

Fig. 6. Relay wiring connections for Evcon/Coleman equipment (3200, 3300). Requires R8222B1067

Relay to operate system. Equipment requires normally energized emergency heat.

Equipment Function

Common

Existing Control

Terminal Designation

Black

New T erminal

Designation

C or X

Power

Emergency Heat

Red

M13236

Fig. 7. Relay wiring connections for Evcon/Coleman equipment (3200, 3300, 3360, 3400, 6000, and 6500).

Requires R8222B1067 Relay to operate system. Equipment requires normally energized emergency heat.

Equipment Function

Indoor Power

System Monitor

Existing Control

Terminal Designation

New T erminal

Designation

M13237

Fig. 8. Relay wiring connections for Lennox equipment (HP9, HP10). Requires R8222B1067 Relay to operate the

system monitor light (emergency heat LED) on TRADELINE replacement thermostats. Tape off if light is not desired.

70-6627 • 10

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Equipment Function

Power

System Monitor

Existing Control

Terminal Designation

New T erminal

Designation

M13238

Fig. 9. Relay wiring connections for Lennox equipment (HP16, HP19, HP21, HP22 Direct Replacements).

Requires R8222B1067 Relay to operate the system monitor light (emergency heat LED) on

TRADELINE replacement thermostats. Tape off if light is not desired.

Equipment Function

Power

System Monitor

Existing Control

Terminal Designation

New T erminal

Designation

M13239

Fig. 10. Relay wiring connections for Magic Chef equipment (PE Series). Requires R8222B1067 Relay

if outdoor section has reset shunt relay and malfunction light indicator is desired on thermostat.

Equipment Function

Power

System Monitor

Existing Control

Terminal Designation

or R R

L or X

New T erminal

Designation

M13240

Fig. 11. Relay wiring connections for Mammoth. Requires R8222B1067 Relay if outdoor

section has reset shunt relay and malfunction light indicator is desired on thermostat.

70-6627 • 11

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Equipment Function

Transformer Common

Power

Fan

Equipment

Terminals

CC RR GG

PC8900

Terminals

O/B 1st Stage Heating 1st Stage Cooling

Changeover V alv e

2nd Stage Heating

Emergency Heat

2nd Stage Cooling

W1 Y1/W1

W2 Aux.

Y2 Y2

M13233

Fig. 12. Relay wiring connections for PC8900 in heat pump applications

requiring separate Y

Equipment Function

Transformer Common

and W1 terminals with a heating changeover.

Equipment

Terminals

PC8900

Terminals

Power

Fan

RR GG

O/B

1st Stage Cooling

1st Stage Heating

Changeover V alv e

2nd Stage Heating

Emergency Heat

2nd Stage Cooling

Y1 Y1/W1

W2 Aux.

Y2 Y2

Fig. 13. Relay wiring connections for PC8900 in heat pump applications

requiring separate Y1 and W1 terminals with a cooling changeover.

M13234

70-6627 • 12

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Understanding Circuits

To understand wiring diagrams, it is important to know what all the symbols mean and how to trace the path of the circuits from the transformer. Circuit descriptions and terminology are defined as follows:

Auto changeover—refers to the presence of an AUTO position in the system switching (EX: Q674F with OFF-COOL

AUTO-HEAT-EM. HEAT switching). The thermostat automatically changes between heat and cool modes as indoor temperature changes.

Manual changeover—requires a system switch movement to change mode (EX: Q674L with EM. HT.-HEAT-OFF-

COOL switching).

Cool changeover valve—operates on cooling. The reversing valve or relay is activated either by moving the system

switch to COOL (manual changeover) or by a mercury switch that makes on a temperature rise (auto changeover).

Heat changeover valve—operates on heating. The reversing valve or relay is activated either by moving the system

switch to HEAT (manual changeover) or by a mercury switch that makes on a temperature fall (auto changeover).

System monitor relay—optional equipment on some heat pumps. This system monitor relay detects a malfunction in

the compressor and indicates the malfunction by activating the EMERGENCY HEAT LED on the switching subbase. The system monitor relay may be wired to the L terminal on some thermostats

Each mercury switch is identified by function:

H1—Stage 1 Heating. H2—Stage 2 Heating. H3—Stage 3 Heating. C1—Stage 1 Cooling. C2—Stage 2 Cooling. C3—Stage 3 Cooling.

C/O—Changeover (heat pumps). Each anticipator is identified and each switch affected is named (EX: H1 anticipator, C1 anticipator). All T874 Multistage Thermostats use mercury switches. Each schematic indicates switch operation by being drawn

in the open position with an arrow indicating operation with a temperature RISE or FALL.

KEY TO HOOKUP SYMBOLS

TRANSFORMER (24 VAC SECONDARY)

RELAY OR CONTACTOR COIL

MERCURY SWITCH

FIXED ANTICIPATOR HIGH RESISTANCE (TYPICALLY 5 KILOHMS)

ADJUSTABLE ANTICIPATOR LOW RESISTANCE (TYPICALLY 0 TO 5 OHMS)

RELAY/CONTACTOR CONTACTS

TERMINAL

LED

ODT

OUTDOOR THERMOSTAT

EHR

EMERGENCY HEAT RELAY

RTD

TIME DELAY RELAY

DEFROST RELAY

CHP

PRESSURE SWITCH

LACO

LOW AMBIENT CUTOFF

M5848

Fig. 14. Key to hookup symbols.

70-6627 • 13

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

NEMA Standard Transformers Give You Better Control

UL sets the safety standards all transformers must meet. But these are minimum standards. The Honeywell AT20A, AT40A, AT72D and AT87A Transformers do even more; they meet tough voluntary standards of the National Electrical Manufacturer’s Association (NEMA).

Why is this so important? Because today’s sophisticated control systems require reliable, accurate voltage output for optimal system performance. It’s especially important for electrical controls (OEM boards in high efficiency furnaces, for example) or resistive heaters, such as thermostat heat anticipators.

For better performance, some heat pumps require a NEMA standard transformer. Conformance to NEMA standards assures the voltage output of a transformer will remain within acceptable limits, regardless of load conditions. No excessively high open-circuit voltage under light load conditions. No low, “brown-out” voltage levels under heavy load conditions. At 100% load, the transformer secondary must supply between 23 and 25 volts to meet the NEMA standard.

How can you tell that the transformers you buy meet this tough, high standard? Look for the transformer to be marked: NEMA Type B (20VA), NEMA Type D (40VA), NEMA Type E (48-50 VA). Only transformers conforming to the NEMA standard can be marked in this way. The following are recommended Honeywell NEMA standard transformers: AT72D1691, AT72D1683, AT87A1106

27 26 25 24 23

21 20 19

SECONDARY VOLTAGE

17 16 15

0 50 100 150

% OF LOAD

200

M993

Fig. 15. NEMA Class 2 transformer band.

70-6627 • 14

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Typical System Hookup Diagrams

L1 (HOT)

EM. HT.

HEAT

COOL

SYSTEM SWITCH

FAN SWITCH

AUTO

OFF

FALL

H1/C1 ANTICIPATOR

H2 ANTICIPATOR

FALL

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

NO AUTO FAN IN EMERGENCY HEAT.

AUX. HT. LED (GREEN)

EM. HT. LED (RED)

RTD 1

LACO CHP

COOL CHANGEOVER VALVE

ODT 1

EHR 1

ODT 2

EHR 2

SYSTEM MONITOR

HEAT CHANGEOVER VALVE

COMPRESSOR CONTACTOR

RTD 2

RTD 3

FAN RELAY

RTD 1

EM. HT. RELAY

M6060A

Fig. 16. Internal schematic and typical wiring diagram for T841A1308.

70-6627 • 15

HEAT PUMP TH ERMOSTAT CROSS REFERENCE/SELECTION GUIDE

FALL

C ANTICIPATOR

H1/C ANTICIPATOR

FALL

RESET

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

FIELD REMOVABLE JUMPER. AUTO FAN IN EMERGENCY HEAT.

Fig. 17. Internal schematic and typical wiring diagram for T841A1555.

FAN SWITCH

AUTO

SYSTEM SWITCH

EM. HT.

HEAT

OFF

COOL

AUX. HEAT LED (GREEN)

EM. HEAT LED (RED)

FAN RELAY

COMPRESSOR MONITOR

OUTDOOR THERMOSTAT

COOL CHANGEOVER RELAY

AUX. HEAT RELAY

OUTDOOR THERMISTOR

COMPRESSOR CONTACTOR

M8728

L1 (HOT)

FALL

H1 ANTICIPATOR

C1 ANTICIPATOR

H2 ANTICIPATOR

FALL

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

FAN SWITCH

AUTO

SYSTEM SWITCH

EM. HT.

HEAT

OFF

COOL

EM. HEAT LED (RED)

AUX. HEAT LED (GRN)

COOL CHANGEOVER RELAY

FAN RELAY

EM. HEAT RELAY

HEAT CHANGEOVER RELAY

W3 RELAY

AUX. HEAT RELAY

COMPRESSOR CONTACTOR

M13249

L2 L1

(HOT)

70-6627 • 16

Fig. 18. Internal schematic and typical wiring diagram for T841A1712 and T841A1738.

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

H1/C1 ANTICIPATOR

FALL

FAN SWITCH

AUTO

SYSTEM SWITCH

H2 ANTICIPATOR

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

FALL

HEAT

OFF

COOL

Fig. 19. Internal schematic and typical wiring diagram for T841B1000.

HEAT RELAY 1

HEAT RELAY 2

B HEAT CHANGEOVER

VALVE

FAN RELAY

COMPRESSOR CONTACTOR

COOL CHANGEOVER VALVE

M6068A

L1 (HOT)

FALL

CHANGEOVER

FALL

H1 ANTICIPATOR

RISE

RESET HEATER

C1 ANTICIPATOR

RISE

FAN SWITCH

AUTO

SYSTEM SWITCH

EM .HT.

AUTO

OFF

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

AUX. HT. LED (GREEN)

EM. HT. LED (RED)

OUTDOOR THERMOSTAT

CHANGEOVER VALVE

C815A OUTDOOR THERMISTOR

FAN RELAY

AUX. HT. RELAY

L1 (HOT)

M1593

Fig. 20. Internal schematic and typical wiring diagram for Y594G1161.

70-6627 • 17

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

FALL

RISE

H1 ANTICIPATOR

H2 ANTICIPATOR

FALL

RISE

C1 ANTICIPATOR

RISE

10 11

FAN SWITCH

AUTO

SYSTEM SWITCH

OFF

EM. HT.

HEAT

AUTO

COOL

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

Fig. 21. Internal schematic and typical wiring diagram for Y594G1633.

CHANGEOVER (HEAT)

FALL

CHANGEOVER (COOL)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

W1 - Y1 JUMPER IS Y TERMINAL; REMOVE JUMPER WHEN W1 RELAY IS USED.

H2 ANTICIPATOR

RISE

C1 ANTICIPATOR

H1 ANTICIPATOR

FAN SWITCH

AUTO ON

SYSTEM SWITCH

OFF EM. HT. HEAT

AUTO

COOL

EM. HT. LED (RED)

AUX. HEAT LED (GREEN)

AUX. HT. LED (GREEN)

EM. HT. LED (RED)

COOL CHANGEOVER VALVE

B RELAY

EM. HT. RELAY

AUX. HEAT RELAY

FAN RELAY

EM. HT. RELAY

CHECK LED (RED)

COMPRESSOR FAULT

COOL CHANGEOVER VALVE

W1 RELAY

COMPRESSOR CONTACTOR

FAN RELAY

COMPRESSOR CONTACTOR

M8702

W3 RELAY

AUX. HEAT RELAY

HEAT CHANGEOVER VALVE

L2 L1

(HOT)

L1 (HOT)

M8703

70-6627 • 18

Fig. 22. Internal schematic and typical wiring diagram for Y594G1419 and Y594G1476.

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

FALL

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED. FIELD REMOVABLE JUMPER.

AUTO

SYSTEM SWITCH

EM. HEAT

HEAT

OFF

COOL

FAN SWITCH

AUX. HEAT LED (GREEN)

EM. HEAT LED (RED)

FAN RELAY

COMPRESSOR MONITOR

OUTDOOR THERMOSTAT

COMPRESSOR CONTACTOR

AUX. HEATER RELAY

OUTDOOR SENSOR

COOL CHANGEOVER VALVE

M8701

L1 (HOT)

Fig. 23. Internal schematic and typical wiring diagram for Y594R1763.

H1 AND C1 ANTICIPATOR

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

FALL

H2 ANTICIPATOR

FAN SWITCH

AUTO

SYSTEM SWITCH

EM. HT.

HEAT

OFF

COOL

EM. HEAT LED (RED)

AUX. HEAT LED (GRN)

Fig. 24. Internal schematic and typical wiring diagram for Y594R1797.

FAN RELAY

COOL CHANGEOVER VALVE

EM. HEAT RELAY

AUX. HEAT RELAY

COMPRESSOR CONTACTOR

"B" RELAY

M8700

L1 (HOT)

70-6627 • 19

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

H1 ANTICIPATOR

C ANTICIPATOR

FALL

H2 ANTICIPATOR

FALL

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

REMOVE JUMPER WHEN W1 RELAY IS USED.

FACTORY-INSTALLED JUMPER.

FAN SWITCH

AUTO

SYSTEM SWITCH

EM. HT.

HEAT

OFF

COOL

EM. HT. LED (RED)

AUX. HT. LED (GRN)

AUX. HT. RELAY

EM. HT. RELAY

HEAT

CHANGEOVER VALVE

W1 RELAY

COMPRESSOR

CONTACTOR

W3 RELAY

COOL CHANGEOVER VALVE

COMPRESSOR MONITOR

FAN RELAY

M8713

L1 (HOT)

Fig. 25. Internal schematic and typical wiring diagram for Y594R1425.

70-6627 • 20

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

L1 (HOT)

POWER SUPPLY

FAN SWITCH

THERMOSTAT LOGIC CIRCUIT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

POSSIBLE CHECK LED CIRCUITS:

CHECK LED (YELLOW)

SWITCH TO R (POWER) SIDE OF SYSTEM TRANSFORMER

SUBBASE LOGIC/ CONTROL CIRCUIT

FAULT DETECTION SWITCH

HIGH LIMIT

TO R

TO C/X

AUTO

SYSTEM SWITCH

EM. HT.

HEAT

OFF

AUTO

COOL

HEAT 1

CHECK LED (YELLOW)

SWITCH TO C (COMMON) SIDE OF SYSTEM TRANSFORMER

FAULT DETECTION SWITCH

HIGH LIMIT

EM. HT. LED (RED)

TO R

CHECK LED (YELLOW)

TO C/X

SWITCH IN SECONDARY OF SEPARATE TRANSFORMER

COOL

AUX. HT. LED (GREEN)

HEAT 2

C. O.

CHECK LED (YELLOW)

SWITCHING DEVICE

24 VAC

C/X

MONITOR

EM. HT. RELAY

COOL CHANGEOVER VALVE

HEAT CHANGEOVER VALVE

M6020A

AUX. HT. RELAY

FAN RELAY

COMPRESSOR CONTACTOR

L1 (HOT)

Fig. 26. Typical wiring diagram for T8611G1004 and T8611G1103.

70-6627 • 21

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

THERMOSTAT LOGIC CIRCUIT

S1 S1

S2 S2

S3 S3

200905 REMOTE

SENSOR

POWER SUPPLY

SUBBASE LOGIC/ CONTROL CIRCUIT

HIGH LIMIT

FAN SWITCH

AUTO

HEAT 1

HIGH LIMIT

EM. HT. LED (RED)

SYSTEM SWITCH

EM. HT.

HEAT OFF AUTO

COOL

COOL 1

HEAT 3

AUX. HT. LED (GREEN)

MONITOR

HEAT 2

C. O.

STAGE 1 COMPRESSOR CONTACTOR

STAGE 2 COMPRESSOR CONTACTOR

COOL 2

CHECK LED (YELLOW)

AUX. HT. RELAY

STAGE 2 RELAY

EM. HT. RELAY

FAN RELAY

COOL CHANGEOVER VALVE

HEAT CHANGEOVER VALVE

L1 (HOT)

70-6627 • 22

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. POSSIBLE CHECK LED CIRCUITS:

CHECK LED (YELLOW)

3 4 5 6

FAULT DETECTION SWITCH

SWITCH TO R (POWER) SIDE OF SYSTEM TRANSFORMER

SOME OLDER HEAT PUMP THERMOSTATS USE X FOR COMMON TERMINAL. NOMINAL 24 VAC POWER MUST BE PRESENT BETWEEN R AND C TERMINALS FOR THERMOSTAT OPERATIONS. AVAILABLE ONLY ON MODLES WITH SEPARATE SENSOR FOR REMOTE TEMPERATURE SENSING. RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 FT. (61 M) MAXIMUM LENGTH.

ROUTE INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.

TO R

TO C

CHECK LED (YELLOW)

SWITCH TO C (COMMON) SIDE OF SYSTEM TRANSFORMER

FAULT DETECTION SWITCH

TO R

CHECK LED (YELLOW)

TO C

SWITCH IN SECONDARY OF SEPARATE TRANSFORMER

SWITCHING DEVICE

24 VAC

Fig. 27. Typical wiring diagram for T8611M7008.

L1 (HOT)

M2656

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

POWER SUPPLY

FAN

HIGH LIMIT

SYSTEM SWITCH

EM. HT.

HEAT

OFF

COOL

SWITCH

AUTO

THERMOSTAT LOGIC CIRCUIT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

REMOVE JUMPER FOR SYSTEM WITH ISOLATED STAGE 1 HEATING AND COOLING CONNECTIONS.

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

SUBBASE LOGIC/ CONTROL CIRCUIT

HIGH LIMIT

COOL 1

EM. HT. LED (RED)

HEAT 1

AUX. HT. LED (GREEN)

HEAT 2

MONITOR

EM. HT. RELAY

FAN RELAY

COOL

CHANGEOVER VALVE

HEAT CHANGEOVER VALVE

AUX. HT. RELAY

STAGE 1 HEAT RELAY

COMPRESSOR CONTACTOR

DEFROST CONTROL

M6019A

L1 (HOT)

Fig. 28. Typical wiring diagram for T8611R1000.

THERMISTOR SENSOR

1 2

THERMOSTAT LOGIC

POWER SUPPLY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPARATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y).

STAGE 2 RELAY

STAGE 1 RELAY

FAN SWITCH

AUTO

SYSTEM SWITCH

EM. HT.

HEAT

OFF

COOL

AUXILARY HEAT RELAY

CHANGEOVER VALVE HEAT

COMPRESSOR CONTACTOR

EMERGENCY HEAT RELAY

RELAY

CHANGEOVER VALVE COOL

COMPRESSOR CONTACTOR HEAT

FAN RELAY

M11333

L1 (HOT)

Fig. 29. Typical wiring diagram for T8011R and T8411R.

70-6627 • 23

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

L1 (HOT)

THERMOSTAT LOGIC

POWER SUPPLY

O/B

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED. O/B IS FIELD CONFIGURABLE TO SELECT ENERGIZED IN HEATING OR

COOLING. (DEFAULT IS ENERGIZED IN HEATING).

REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPARATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y1).

O/B

CHECK LED (RED)

AUXILIARY HEAT RELAY

COMPRESSOR CONTACTOR

CHANGEOVER

VALVE

O/B

COMPRESSOR CONTACTOR HEAT

EMERGENCY HEAT RELAY

FAN RELAY

COMPRESSOR MONITOR

TO R

OUTDOOR SENSOR C7089B

M13281

Fig. 30. Typical wiring diagram for T8511G.

70-6627 • 24

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

(HOT)

POWER SUPPLY

THERMOSTAT LOGIC

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED. WIRES TO OT TERMINALS SHOULD NOT SHARE CABLE WITH OTHER

CONNECTIONS.

INSTALLER CONFIGURABLE. FACTORY DEFAULT IS O-ENERGIZED IN COOL MODE.

FACTORY-INSTALLED JUMPER; REMOVE IF A HEAT RELAY IS CONNECTED TO W1.

O/B

FAIL LED (RED)

CHECK LED (RED)

AUXILIARY HEAT RELAY

COMPRESSOR CONTACTOR

O/B

COMPRESSOR CONTACTOR HEAT

EMERGENCY HEAT RELAY

CHANGEOVER VALVE

FAN RELAY

COMPRESSOR MONITOR

OUTDOOR SENSOR C7089B

TO R

M13250

Fig. 31. Typical wiring diagram for T8611G2002 and T8611G2028.

70-6627 • 25

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

Electronic Thermostat (T8011, T8411, T8511, T8611) Sequences of Operation

T8011 Programmable Heat Pump Thermostat and T8411 Electronic Heat Pump Thermostat

Sequence of Operation

The Fan, Heat and Cool outputs are relay controlled. A loss of ac power, or a change in the SYSTEM switch setting can cause the outputs to turn off. Table 2 shows the sequence of operations for the Fan settings and System modes.

Table 2. T8011 and T8411 Sequence of Operation.

FAN Switch Settings SYSTEM Switch Settings Call for Action Energize Terminals Display Icons

Auto Cool None O None Auto Cool Cooling O, Y, G

Auto Heat None B Auto Heat Stage 1 Heat B, W1, G

Auto Heat Stage 2 Heat B, W1, W2, G , Aux Ht

Auto Em. Ht. None L Em Ht indicator Auto Em. Ht. Stage 1 Heat L, E, G , Em Ht indicator

Auto Em. Ht. Stage 2 Heat L, E, W2, G , Em Ht and Aux

None

indicator

Ht indicators

70-6627 • 26

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

T8511 Deluxe Electronic Heat Pump Thermostat

Sequence of Operation

The thermostat energizes specific terminals depending on the Fan and System Settings. The LCD will display symbols and words to report the condition of system. See Table 3 for specific information.

Table 3. T8511G Sequence of Operation for Separate Compressor Terminal (Y and W1) Models.

Fan Selection System Selection Call Energize Display Icons

Auto Off None None None

On Off Fan G

Auto Cool None O/B Auto Cool or Auto Cooling O/Ba, G, Y1 and

Auto Heat None O/B Auto Heat or Auto Stage 1 heating O/Ba, W1, G and

Auto Heat or Auto Stage 2 heating O/Ba, W1, W2, G , , and Aux Ht

Auto Em Heat None O/B Auto Em Heat Stage 1 heating O/Ba, E, G , and Em Ht

Auto Em Heat Stage 2 heating O/Ba, E, W2, G , , Em Ht and

Auto Auto None O/B

Configure O/B (Select Models) in Installer Setup.

None

Em Ht

Aux Ht

None

70-6627 • 27

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE

T8611 Chronotherm IV Deluxe Programmable Heat Pump Thermostat

Sequence of Operation

The thermostat energizes specific terminals depending on the Fan and System Settings. The LCD will display the time, room temperature, system and fan selection. Symbols will be displayed when the heating, cooling or fan is energized. See Table 4 for specific information.

NOTE: Terminals listed in the Energize column vary depending on model.

Table 4. Heat Pump System Sequence of Operation.

Selection

Fan System Call Energize Display Icons

Auto Off None None None

On Off None G

Auto Cool None O or O/B Auto Cool or Auto Stage 1 Cooling O or O/B

G and Y1 Auto Heat None B or O/B Auto Heat or Auto Stage 1 heating B or O/Ba with W1 and G and

Auto Heat or Auto Stage 2 heating B or O/Ba with W2, W1 and G , , and Aux Ht

Auto Em Heat None B or O/B Auto Em Heat Stage 1 heating B or O/Ba, E and G

(select models) Auto Em Heat Stage 2 heating B or O/Ba, E and W2 and G

(select models) Auto Auto None O/Ba, O or B

Configure O/B (select models) in Installer Setup.

Based on last piece of equipment called (cooling = O or heating = B) and Installer Setup selection.

a a

with

None

and

None

Em Ht

, and Em Ht

, , Em Ht and Aux Ht

None

70-6627 • 28

+ 94 hidden pages

Honeywell T841, T8411, Y594, T8511, T8611 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual