Trane TCONT900AC43UA - Charge Assist Control Board; Comfort Control; COMSYS Furnace Update; Control Board CNT4829

R - C 22
Reference Materials
Charge Assist Control Board
• Change from CNT05127 to CNT06103
- Production starts 3/22/10 FW13
• Change High Pressure Monitor routine
- Software now counts the first high pres
sure event
- Total of 6 events required to lockout
system with Err 80
- Event counter resets if 24 hours pass
without hitting maximum number of HPCO
trips being monitored
• LPCO monitor will reset Event counter if system
runs 5 hours without additional LPCO trips
- Same “Y” call not required
- 3 cooling mode events & 3 heat more
events allowed
Comfort Control
• A/TCONT900 built before 0752
- If communicating ODU is not installed you
may see Err 126 (equipment change alert)
on the Comfort Control screen.
Reset the control with ISU #
0710, option 1
• Notice to Installers (900 control)
- For communicating Cooling outdoor units
applied with a communicating air handler
without aux heat installed.
Visit ISU # 0176 (heater stages)
and select 0 – None
• A/TCONT900AC43UAA
- Phase-2 software release
• May 1st, 2009 (first shipment)
• 0904 Date Code
- On product (back of wall plate)
- On Box
• Installer Guide
- 18-HD32D1-2 (Trane)
- 11-HD04D1-2 (AmStd)
• Owner’s Guide
- 22-5211-02 (Trane)
- 12-5046-02 (AmStd)
• Heating setpoint range; low limit = 50º F
(was 40º F)
• Dual Fuel upstage to furnace timer modification
(ISU0346)
- Timer restricted to Y2 run time
• 1st Stage Heater; Defrost Balance Point (ISU0361)
- Factory default changed to “0”- Disabled
(was 55º F)
• Make available to User Setup Menu
- ISU0380 (Indoor dehumidification control)
- ISU0383 (Maximum droop selection)
• Extended Fan “ON” -Time Heat (ISU0650)
- Factory default changed to “0” (was 120
seconds)
• Compressor Cool Blower “OFF” - Delay (ISU0661)
- Factory default changed to 90 seconds
@100% (was 0 - Disabled)
COMSYS Furnace Update
Control Board CNT4829
• Hybrid Systems (Dual Fuel)
- EM HT Mode
Change from utilization of stages
1 & 2 (9055 and prior) to
utilization of stages 2 & 3 gas
heat (9061 and later)
Staging base on demand
(load value)
- Installer Test 4 (EM HT)
IFC now responds to test request
Stages 2 & 3 only
-Service Bulletin FURN-SVB34B-EN
(May 2009)
- New Software Serial Date Code 9061****G