Honeywell Thermostats, Filters, and Electronic Air Cleaners
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IAQ Total Home Comfort Systems
The excellent replacement for the Pc8900 which is no longer available.
But two very good replacements are:
Link to Honeywells VisionPRO IAQ as a replacement for the PC8900
Honeywell VisionPRO IAQ
The TH9421U touch screen universal programmable thermostat is an excellent replacement.
Link to Honeywell HD IAQ Thermostats
Honeywell's High Definition
replacements for the Pc8900.
 
The following is provided for information purposes only.
Perfect Climate Comfort Center® Control System

pic of the PC8900 that is obsolete and not available for sale.
PC8900A
Link to page with more detail on the PC8900
The PC8900 and all components are obsolete.
For complete Data, Manuals, etc. click here.
Model Number Name Price
PC8900A1007 Control System Control Panel
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available.
PC8900A1015 Control System Control Panel
Enviracaire Elite Perfect Climate Comfort Center same as PC8900A1007 except W/new keypad overlay. Keys are blue W/white lettering.
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available.
W8900
Remote Module for conventional 24 Vac systems
Mounts near equip.
The W8900 Remote Module
All htg, clg, vent, humid & all sensors & Pc8900 wire to W8900
Link to the Control Center Remote Module page
W8900A1004 up to 2 heat/ 2 cool
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available.
W8900A1020 up to 2 heat/ 2 cool
same as W8900A1004 except enviracom blue cover and case
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available.
W8900A1012 With O/B terminals for ht/cl changeover valves
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available.
W8900A1015 same as W8900A1004 except enviracom blue cover and case.
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available.
W8900A1038 similar to W8900A1012 except W/Blue cover ' case. With O/B terminals for ht/cl changeover valves
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available.
Y8900A1002 KIT containing one (1) PC8900A1007 and one (1) W8900A1046. Up to 2 heat/ 2 cool, this W8900A tries to control to the homeowner's selected Relative Humidity setting but limits over cooling to a maximum of 3° below the cooling temperature setpoint.
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available
W8900B1002 For 24 Vac heat pump systems up to 3 stage heat/2 cooling for conventional system mounts near equip. All Htg, clg, vent, humid " all sensors & Pc8900 wire to W8900.
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available
W8900B1010 For 24 Vac heat pump systems up to 3 stage heat/2 cooling for conventional system mounts near equip. All Htg, clg, vent, humid & all sensors & Pc8900 wire to W8900. With blue cover and case.
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available
W8900C1000 Up to 2 stage heat/2 cooling with cooling humidity reheat algorithm; model available with O and B terminals for zoning. For application in hot high humidity climates.
Replaced by Honeywell's VisionPRO IAQ or Honeywell's HD IAQ Thermostats
no longer available
 
Pic of the W8900 Remote Module and Link to Honeywells site for pdf file of Product Data

Adding the CM8900A Communications Module and the W8735B Telephone Access Module gives the PC8900A/W8900A-C remote communications. Users can monitor the outdoor temperature, humidity, current setpoint, system mode, alarm out on High-Low temperature, filter status and equipment failure. See separate instructions on CM8900A and W8735B for more detailed information.
Accessories
C7089A1002
Outdoor temperature sensor for
Pc8900/Panel/W8900 Remote Module
The C7089 outdoor temperature sensor
Link to detailed information about sensor
$call
HONC7089U1006
Outdoor temperature sensor for
(VisionPRO Series thermostats
click here
HONC7089B1000
Outdoor temperature sensor for
Chronotherm IV(T8500 & T8600 Series) thermostats and TZ-4 Zone Panel
$call
C7100A1015 13 inch averaging sensor used with W7100,W8900 and others.
The C7100 discharge air sensor

Discharge Sensor; used to sense temperature in discharge or return air and to troubleshoot system operation. I have some of these still in stock.
$74.74
HONC7189U1005
Remote indoor temperature sensor for
(VisionPRO Series thermostats
click here
C7189A1001
Sensor for temperature in indoor air spaces.
See Users Manual, Installation, and Specifications by Honeywell
Provides remote temperature input to W8900, remote module and VisionPRO (Th7000 & Th8000) and can be installed in quantities of 1, 4 or 9 per system. White
$31.36
Clearance
$24.99
CM8900A1009
Link to Honeywells site for this obsolete item
The Communication Module plugs directly into W8900 to allow communication via telephone. Adding the CM8900A Communications Module and the W8735B Telephone Access Module gives the PC8900A/W8900A-C remote communications. This item is obsolete and available while supplies last.
$86.26
Close-Out
$35.99
W8735B1003
Superseded but still available
See Users Manual, Installation, and Specifications by Honeywell

W8735B Telephone Access Module provides remote telephone access to an HVAC system when used with a T8635L, an EnviraCOM™ enabled thermostat such as the TH9421C1004 VisionPRO IAQ Total Home Comfort System, or the TH5320C1002 FocusPRO and the appropriate interface modules W8635A or W8635B. The W8735B can be used with conventional or heat pump applications. The W8735B can provide remote access of up to nine zones when used with the W8703A Damper Interface Module(s). When used with C7835A Discharge Temperature Sensor, additional HVAC diagnostics, such as equipment performance monitoring, are available. The W8735B uses Enviracom™ Network, a low-cost, wired communications protocol.
Available while supplies last. See W8735D below.
$348.83
HONW8735D1009
The W8735D Telephone Access Module (2 channels, 9 zones ea.)
Link to Honeywells site for Product Data
provides remote telephone access to the HVAC system when used with one of the following thermostats:
  • this prior obsolete model still in stock T8635L communicating thermostat or
  • ,
  • the current production TH9421C1004 VisionPRO IAQ Total Home Comfort System EnviraCOM™ enabled thermostat , OR
  • the non-programmable TH5320C1002 FocusPRO
AND the appropriate equipment interface module THM5421C1008. These thermostats can be used with one or more of the following additional controls: The W8735D also communicates with R7184P and R7184U oil primary controls and L7224U Aquastat™ remote temperature sensors as well as any other EnviraCOM enabled controls to communicate current status and alert information.

*  Reports alert messages on:
  • high or low indoor/outdoor temperature
  • high or low humidity
  • low battery
  • auxiliary input sensor tripped
  • pass code change
  • air filter change required
  • system alerts
  • power outage.
Supports 18 zones (W8735D1009) ; 36 zones (W8735D1017) when using zone panels
Other products you may be interested in: the 6I-EnergyICM Internet Module. Allows total control of the system via the internet anywhere, anytime.
$331.14
HONW8735D1017 The W8735D Telephone Access Module is identical to the W8735D1009 but for zones capability. Has 4 channels.
* Supports 18 zones (W8735D1009) ; 36 zones (W8735D1017) when using zone panels.
$499.96
HONC7835A1009
See Users Manual, Installation, and Specifications by Honeywell

Discharge Air Temperature Sensor for use with the W8735B Telephone Access Module
Used with Honeywell Network Zoning System and single unit zone applications (W8835 &: W8635).
$71.70
$56.95
Ws1 A solid state control designed to help prevent flooding, damage to carpets, walls, furniture, ceilings, etc. Turns system off when detecting moisture due to condensate or drain leaks. As few as one or two drops will cause a wet switch to turn off a unit or sound alarm. Easily reset. Can also be used with the W8735B1003 Telephone access module to give alert when away from home. Requires 24 Vac and has one Normally Open and one Normally Closed contact to alert or sound alarm.
* LED activation indicator.
* Contact rating: 2A
click here
to see price
 
Other Accessories
Model Number Description Color Minimum Purchase Price
205224A Wall Cover Plate; used when Pc8900
cannot cover wall marks from old thermostat.
white
1
$13.28
32004796-001 Replacement door assembly for
Pc8900 Door
P/N 205215 with programming label
number 208352 glued in place.
Sorry--They are all gone!
white
0
$None
Left
202689A Mounting Plate Accessory;
used when C7189A cannot cover wall
marks from old thermostat.
white
1
$13.26
0144FS Remote air pressure switch
--
1
$33.08