Control Board; Airflow (Lower Than Expected) - Trane ACONT900AC43UA Service Manual

Control Board

• 3-Stage Furnace (*UH3/*DH3)
- CNT04829
• LAST 4 FAULTS (User Interface)
- Add position identifier

Airflow (Lower Than Expected)

• 3 Stage A/TUH3 Furnaces
• Heads Up #905 sent via email 6/29/09
• Date codes affected 9061 – 9283
- Coincided with conversion to 16x motor
software
MOT13225

MOT13226

MOT13227

- 4 coefficient PM installed in 3 stage
product
- 5 coefficient PM installed in 80% comm
product
No airflow problems with 80%

furnaces
• 4 coefficient combined with 16x software results in
low airflow
• 5 coefficient PM's developed for manufacturing
- Date code corrections implemented 9284
• FURN-SVB36A-EN
- 8/24/09 Revision to Bulletin
(Originally 7/24/09)
- All 3-Stage Furnaces (Upflow & Downflow)
Personality Module replacement

to resolve low airflow issue
Date range of units affected 9061

to 9283
•
Reference Materials
16 Seer Update
Control Board Point Release
• CNT04880 to CNT06042
- 2-5 ton 16 SEER-COMSYS models only
- Defrost Control enhancements
Start Date (November 9th, 2009)

FW46
Summary of Issue - 16 Seer COMSYS
16 SEER Update - Control Board Point Release
• CNT06042
- Backward compatible for all COMSYS 16
SEER
- Software change for Defrost function only
- New models (9465****F and later):
Revert to pre-COMSYS termination
temperatures
Eliminate Fault B timed-defrost
• PM – Specialty Personality Module
- High Termination requirements
- Sales Order with New Equipment purchase
BAYHITEMP02A

(4A6H6024C1 & 4TWX6024C1)
BAYHITEMP03A

(4A6H6036C1 & 4TWX6036C1)
BAYHITEMP04A

(4A6H6048C1 & 4TWX6048C1)
BAYHITEMP05A

(4A6H6060C1 & 4TWX6060C1)
• Installer Guide 18-HH21D1-1
- High Temperature Defrost Termination
Personality Module
R - C 23