The specifications given in this publication do not
include normal manufacturing tolerances; therefore,
an individual unit might not exactly match the listed
specifications. Also, this product is tested and
calibrated under closely controlled conditions, and
some minor differences in performance can be
expected if those conditions are changed.
The PC8900A Comfort Center™ Control Panel mounts in the
living space and accurately measures and controls room
temperature and humidity. The W8900A-C Remote Module
provides a wiring panel and switching for the Perfect Climate
Comfort Center™ Control System. See Table 1.
System Components and Accessories (See Fig. 1):
C7089A1002 Outdoor Sensor: Used to measure outdoor
C7100A1015 Discharge Air Sensor: Used to sense
temperature in discharge or return air.
C7189A1001 Remote Indoor Sensor: Used for remote sensor
CM8900A1009 Communication Module: Used for remote
W8735B1003 Telephone Access Module: Used for remote
202689A Mounting Plate Accessory: Used when C7189A
Remote Indoor Sensor cannot cover wall marks from old
205224A Wall Cover Plate: Used when PC8900A Control
Panel cannot cover wall marks from old thermostat.
32007496-001 Replacement Door: Used for PC8900A Control
205224A: See Fig. 2.
C7089A: See Fig. 3.
Models with O and B terminals have single stage cooling.
Uses reheat. See Operation section.
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Relations
Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 (800) 328-5111
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
Table 1. W8900A-C Models.
C7100A: See Fig. 4.
C7189A: See Fig. 5.
PC8900A: See Fig. 6.
W8900A-C: See Fig. 7.
Operating Ambient Temperature Range:
NOTES: System is capable of turning on heat at 0°F (-18°C).
C7089A: -40° to 128°F (-40° to 53°C).
C7100A: 40° to 150°F (4° to 66°C).
C7189A: 40° to 95°F (4° to 35°C).
PC8900A: 40° to 110°F (4° to 43°C).
W8900A-C: -40° to 150°F (-40° to 66°C).
Shipping Temperature Range (All Components): -20° to
150°F (-29° to 66°C).
Operating Relative Humidity Range (All Components):
5 percent RH to 90 percent RH, noncondensing.
C7089A Outdoor Sensor: Mounts outside of living space
using locally obtained mounting hardware.
C7100A Discharge Air Sensor: Mounts in discharge air duct,
near air exchanger in a 2 x 4 in. outlet box or on a flat duct
or plenum surface. The temperature sensor probe passes
through a 7/8 in. knockout in the 2 x 4 in. outlet box.
C7189A Remote Indoor Sensor: Mounts directly on the wall
using mounting screws and anchors provided.
PC8900A Control Panel:
Without Remote Sensor: Mounts directly on the wall in living
space using mounting screws and anchors provided.
With Remote Sensor: Mounts directly on the wall in a
closet or other convenient location using mounting
screws and anchors provided.
W8900A-C Remote Module: Mounts directly on the wall, near
HVAC equipment or cold air return, using mounting screws
and anchors provided.