Honeywell perfect climate comfort center control system User Manual

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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 

phone:

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.

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 tem-

perature.

C7100A1015 Discharge Air Sensor: Used to sense tempera-

ture in discharge or return air.

C7189A1001 Remote Indoor Sensor: Used for remote sensor 

applications.

CM8900A1009 Communication Module: Used for remote 

communication.

W8735B1003 Telephone Access Module: Used for remote 

communication.

202689A Mounting Plate Accessory: Used when C7189A 

Remote Indoor Sensor cannot cover wall marks from old 

thermostat.

205224A Wall Cover Plate: Used when PC8900A Control 

Panel cannot cover wall marks from old thermostat.

32007496-001 Replacement Door: Used for PC8900A Control 

Panel.

205224A: See Fig. 2.

C7089A: See Fig. 3.

C7100A: See Fig. 4.

C7189A: See Fig. 5.

PC8900A: See Fig. 6.

W8900A-C: See Fig. 7.

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).

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 liv-

ing 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.

a

Models with O and B terminals have single stage cooling.

b

Uses reheat. See Operation section.

W8900A

Conventional

2

2

a

yes

yes

yes

PC8900A

W8900B

Heat pump

3

2

yes

yes

yes

PC8900A

W8900C

Conventional

2

2

yes

yes

yes

b

PC8900A