Honeywell Home T4 Pro Thermostat Wiring Diagrams User Manual

Honeywell Home T4 Pro Thermostat Wiring Diagrams

WIRING DIAGRAMS

Stage Heat Only: Gas or Oil Furnace

1. COMMON OPTIONAL.
2. USED FOR INDEPENDENT FAN CONTROL ONLY. MOST HEAT-ONLY, GAS OR OIL-FORCED AIR SYSTEMS DO NOT USE A FAN WIRE.

Stage Cool Only

 

1H/1C: Gas Furnace

1. COMMON OPTIONAL.

Transformer System, 1H/1C: Oil Furnace

 

Transformer System, Hot Water Heat with Air-Conditioning (or Hot Water Coil)

 

Hot Water Boiler, Heat Only

Hot Water Heat with Power Open Zone Valve

 

 

Hot Water Heat with Power Open/ Power Closed, Series 20 Zone Valve

 

1. COMMON OPTIONAL TO THERMOSTAT.
2. THE THERMOSTAT MUST BE CONFIGURED FOR RADIANT HEAT WITH 0 COOL STAGES.

1H/1C: Heat Pump without Aux Heat

1. COMMON OPTIONAL.
2. CONNECTION (HEAT PUMP FAULT) NOT AVAILABLE ON T1 AND T4
3. MODELS. THE TH6210U2001 CAN BE USED IF A FAULT INDICATION ON THE THERMOSTAT IS NEEDED.
4. SOME HEAT PUMPS USE B RATHER THAN O FOR REVERSING VALVES. DO NOT CONNECT ANY WIRE TO W FOR HEAT PUMP APPLICATIONS! THIS CAN CAUSE HEAT TO RUN CONTINUOUSLY.

2H/1C: Heat Pump with Electric Aux Heat

 

1. COMMON OPTIONAL.
2. CONNECTION (HEATPUMP FAULT) NOT AVAILABLE ON TH4210U2002 MODEL. THE TH6210U2001 CAN BE USED IF A FAULT INDICATION ON THE THERMOSTAT IS NEEDED.
3. SOME HEAT PUMPS USE B RATHER THAN O FOR REVERSING VALVES.
4. DIFFERENT HEAT PUMP MODELS LABEL THE AUXILIARY HEAT TERMINAL DIFFERENTLY THAN SHOWN. CONSULT THE HEAT PUMP WIRING GUIDE.
5. IF AN AUX HEAT LOCKOUT ON HIGH OUTDOOR TEMPERATURE IS REQUIRED, USE THE TH6220U2000 THERMOSTAT AND C7089U1006 OUTDOOR SENSOR. THE TH4210U2002 CANNOT DO THIS. MOST HEAT PUMPS SHARE THE SAME SET OF HEAT STRIPS FOR AUX AND EM HEAT. IN THOSE CASES E ISN’T USED. IF YOU HAVE SEPARATE HEAT SOURCES FOR THE AUX AND EM HEAT, THE TH4210U2002 CANNOT
6. BE SET TO DO THIS. THE TH6320U2008 MODEL CAN BE CONFIGURED FOR SEPARATE AUX AND E. IF THIS IS DONE, WIRE ONE SET OF STRIPS TO E TO BE ENERGIZED IN EM HEAT AND A DIFFERENT SET OF STRIPS TO AUX TO BE ENERGIZED IN AUX HEAT. DO NOT CONNECT ANY WIRE TO W FOR HEAT PUMP APPLICATIONS! THIS CAN CAUSE HEAT TO RUN CONTINUOUSLY.

• Resideo Technologies, Inc.
• 1985 Douglas Drive North, Golden Valley, MN 55422
• 1-800-468-1502
• 33-00325—02 M.S. Rev. 07-21 | Printed in the United States

2021 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates.

TH4110U2005 Manual_ Honeywell Home T4 Pro Programmable Thermostat User Guide

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Honeywell Home T4 Pro Thermostat Wiring Diagrams