Honeywell Heat/1Cool User Guide - Page 35

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Tips for Using This Heat Pump Cross Reference This cross reference, alphabetized by equipment or thermostat manufacturer, provides the information needed to choose and wire the Honeywell electromechanical, Chronotherm III, or electronic heat pump thermostats in new installations and replacement applications. It also gives you the opportunity to upgrade the system from a standard to a deluxe thermostat for improved performance and from manual changeover to the convenience of automatic heat/cool changeover and to a Chronotherm® IV thermostat that puts the heat pump to work to save money. Best of all, you can upgrade to the PC8900/W8900B1002 Perfect Climate Comfort Center™ Control System. This one comfort center controls temperature, indoor air quality, ventilation, humidity, and zoning. To use this Cross Reference: 1. Identify heat pump equipment manufacturer and refer to those diagrams in this reference. 2. Identify existing subbase model number if made by Honeywell, even if thermostat has equipment manufacturer's logo, and try to match up for verification. Some typical thermostats and subbases are listed in each section to make identification easier. The Honeywell model number is listed, followed by the equipment manufacturer model number, if available. 3. Make a listing of wiring terminals used and wire colors. You may want to write on the appropriate diagram in this cross reference. 4. Note the unique control requirements your heat pump may have. - Determine reversing valve (changeover) mode. O terminal cool or B terminal heat is typical. - Identify first stage heat terminal. Connect to Y if a common terminal is used for first stage heat and cool, or to W1 if a separate terminal is used for first stage heat. - Identify if device has manual or automatic changeover from heat to cool. - Identify what action, if any, is required for LED selection; e.g., auxiliary heat, emergency heat, check, or fail. 5. Select a replacement based both on the technical requirements and your customer's needs; e.g., a working family may find a Chronotherm® IV upgrade desirable. 6. After selecting the proper thermostat, use the corresponding control hookup diagram. See example below. Existing Control Terminal Designation Electromechanical Chronotherm III Thermostat Thermostat Electronic Replacement or Upgrade Perfect Climate Chronotherm IV Comfort Center Thermostat Control System C Hook wire X or to C or to previously on C to X R Hook wire R or to R or to previously on R to R C or to R or to C or to R or to C R M13251 7. Connect only those terminals shown with lines to them on the diagram. Some terminals on the new thermostat may not be used. 8. Refer to the following two pages for an example of a typical cross reference diagram and the associated footnotes. 70-6627 • 33