Table of Contents
Advertisement
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.
Identify existing subbase model number if made by Honeywell, even if thermostat has equipment manufacturer's
2.
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
C
R
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.
Electromechanical
Chronotherm III
Thermostat
Thermostat
Hook wire
or to
X
previously
on C to X
Hook wire
or to
R
previously
on R to R
Electronic
Replacement
or Upgrade
or to
or to
C
C
or to
or to
R
R
Perfect Climate
Comfort Center
Chronotherm IV
Control System
Thermostat
or to
C
C
or to
R
R
M13251
70-6627 • 33
Hide quick links:
Advertisement
Table of Contents
