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ACONT900AC43UA
Trane ACONT900AC43UA User Manual
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Air Conditioning Procedures
Ser
vice Guide
Communica
ting R
esidential
Comfor
t Systems
First Edition
© 2010 Trane Inc.
All rights reserved. No part of this book
may be reproduced, in any form or by
any means, without permission in
writing from the publisher
.
Produced and printed in the USA
A Comprehensiv
e R
eference for Ser
vice of
Communicating
R
esidential Air Conditioning, Heat Pump & Gas Furnace Systems
1.0
2
Table of Contents
Communicating Controller
9
Default Chapter
9
Table of Contents
9
Introduction
11
Product Specifications
11
Installation
11
When Installing this Product
11
Location
12
Selecting Comfort Control Location
12
Sub-Base Installation
12
Wiring
13
Mounting Comfort Control on Sub-Base
14
Initial Power-Up
14
Power-Up Sequence
14
Discovery Mode
14
Communicating Indoor Unit - Communicating Outdoor Unit
15
Communicating Indoor Unit - Single Stage Cooling Unit
15
Adjusting Real Time Clock
15
Setting Calendar and Time
15
Entering Installer Setup
16
Operation: Using the Comfort Control
26
System and Fan Settings
26
Fan Settings
26
LED Indication
26
Filter Indication
26
Pre-Programmed
26
Alert Code Numbers
26
Equipment Damage Hazard. Minimum Compressor Off-Time Is Bypassed During Installer System Test
27
System Checkout
27
Installer System Test
27
Advanced Features
27
Adjustable Continuous Air Flow
27
Control Response Rate
28
Cycle Rate
28
Auto Changeover
28
Backlit Display
29
Filter Reminders
29
Fan Selections
29
Screen Locked
29
Installer System Tests
29
Default Factory Settings
29
Setpoint Deadband
29
Wait Indicator
30
Calibrate Indoor Temperature
30
Humidification
30
Indoor Humidification Control
30
Frost Control
30
Dehumidification
30
Integrated Temperature and Humidity Control (ITHC)
30
Droop
31
Comfort-R™ Delay
31
Dehumidification Airflow
31
Proprietary Humidity Control
31
TCONT900AC43UA Installer's Guide
30
Outdoor Temperature Sensor
30
Special Heat Pump Features
31
Auxiliary Heat Lockout Temperature
31
Compressor Heat Lockout Temperature
31
Operation in Heat Mode
32
Defrost Heater Balance Point Control
32
Operation in Emergency Heat Mode
32
Heat Pump with Fossil Fuel Heat (Dual Fuel) and Outdoor Temperature Sensor
32
Troubleshooting Guide
33
Communicating Air Conditioning and Heat Pump Systems
39
16 Seer
40
Air Conditioner and Heat Pump Models
40
Charge Assist
42
Power Interrupt Delay
42
Heat Pump Cooling Mode of Operation
42
Defrost Mode
43
Defrost Initiation
43
Defrost Termination
43
20 Seer
44
Air Conditioner and Heat Pump Models
44
Charge Assist
46
Power Interrupt Delay
46
Heat Pump Cooling Mode of Operation
46
Heat Pump Heating Mode of Operation
47
Defrost Mode
47
Defrost Initiation from First Stage Heating Cycle
47
Defrost Termination to First Stage Heating Cycle
47
Defrost Termination to Second Stage Heating Cycle
48
Communicating Air Conditioning and Heat Pump Systems
49
High Pressure Monitor Logic
50
20 SEER Heat Pump Model Control Boards
50
Overview
50
Sump Heater Control
50
Low Pressure Monitor Logic
50
Cool Mode LPCO Logic
52
Low Temp Lockout in Cool Mode
52
Timing Logic for LPCO Open Events
52
Sensor and Control Voltage Fault Detection
53
Power Interruption Protection
54
Oil Return Mode 20 Seer Heat Pump Models
54
Ambient Temperature Sensor and Oil Return Mode
54
Charge Assist Feature All Models
55
Demand Defrost Cycle Heat Pump Models
55
Defrost Component Electrical Wiring
55
First Defrost Event
56
Terminate Temps
56
Demand Defrost Control Checkout
57
Board Variations
57
Communicating Air Conditioning and Heat Pump Systems
59
Overview
60
Problems
60
Troubleshooting the EEV
61
Electronic Expansion Valve (EEV) Control Board
61
How to Test
62
Close Valve Test
62
Open Valve Test
62
Exit Test Mode
62
Troubleshooting Flow Chart
63
Communicating Systems Charge Assist
81
Sequence of Operation
82
Control LED Indications
82
Installer's Guide for BAYCAKT001AA Charge Assist™ Tool
83
Connecting the Charge Assist™ Tool
83
Charge Assist™ Procedure with a Communicating Comfort Control
84
Parameters for Using Charge Assist
85
Charge Assist TM System Initialization
85
Using Charge Assist
85
CHARGED Routine
86
ADD Routine
87
RECOVER Routine
87
Charge Assist™ Procedure for a Non-Communicating 24VAC Control System
88
Before Adjusting System Charge
88
Adjusting System Charge WITHOUT Charge Assist
91
TM Tool BAYCAKT001AA (Solenoid Kit)
91
Adjusting System Charge with Charge Assist
92
TM Tool BAYCAKT001AA (Solenoid Kit)
92
Charge Assist
92
TM Control
92
Troubleshooting Charge Assist
95
Fault LED Flash Codes of 2, 3 or 4 Flashes
95
Fault LED Flash Code of 5, Err Code 67
95
Fault LED Flash Code of 7, Err Code #79
97
Fault LED Flash Code of #10
97
Communicating Air Handler
103
Introduction
104
Air Handler Interface Display Assembly
104
24VAC Fuse
104
Control Board
105
Serial Port Variable Speed Motor
105
Electric Heater Terminals
105
Humidifier Terminals - (HUM)
105
Electronic Air Cleaner Terminals (EAC)
105
Status LED
105
Bit Master (BM) LED
106
Com Led
106
Fault LED
106
Sequence of Operation
107
Communicating Mode
107
Continuous Fan
107
Call for Cooling
107
Call for 2Nd Stage Cooling
107
Heating
107
Heat Pump Only Applications
107
Heat Pump & Electric Heat Applications
108
24V Mode
108
Continuous Fan
108
Cooling Operation
108
Blower Operation Vs. Y1 & Y2 Inputs - A/C & Heat Pumps
108
Heating Operation
108
Electric Heat Only Sequence - 24VAC Input
109
Heat Pump Only Sequence - 24VAC Input
109
Heat Pump with Electric Heat Sequence - 24VAC Inputs
109
Test Mode
109
Communicating Systems Troubleshooting Checklist
110
Service Bulletins
111
Communicating Gas Furnaces
119
Communication Mode
120
24VAC Mode
122
Thermostat Call for W2 after W1
122
W2 Satisfied, W1 Still Called for
122
W1 Satisfied
122
Indoor Blower Motor Operation Thermostat Fan Switch "CONTINUOUS
123
IFC Inducer Learning Routine Sequence
124
Alert Code Recovery
128
Comfort Control Call for 1St Stage Heat ((A/T)CONT900)
132
Comfort Control Call for 2Nd Stage after 1St Stage
132
Indoor Blower Motor Operation Thermostat Fan Switch "CONTINUOUS
132
UD2 24V Mode
134
Thermostat Call for 1St Stage Heat (2 Stage Heating Thermostat)
134
Thermostat Call for 2Nd Stage after 1St Stage
134
Thermostat Satisfied
134
Indoor Blower Motor Operation Thermostat Fan Switch "ON
135
Alert Code Recovery
136
UH3 Inducer Learning Routine Sequence
140
Third Stage Inducer Learning Routine
140
Electronic Air Cleaners Electronic Air Cleaners
235
Components of the Air Cleaner
236
Introduction
237
Modes of Operation
237
Electrical Connections
237
Wiring Diagram for Communicating Mode
238
Wiring Diagram for 24V Mode
239
Electrical Connections to a Communicating Systems Air Handler in Conventional 24V Mode
240
Electrical Connections to a Communicating Systems Air Handler in Communicating Mode
242
Electrical Connections to a Communicating Furnace in 24V Mode
243
Electrical Connections to a Communicating System Furnace
245
Electrical Connections to an Oil Furnace
247
Electrical Connections for Dual Whole House Air Cleaners
248
Electrical Connections for Dual Whole House Air Cleaners and Furnace in Conventional 24V Mode
248
Electrical Connections for Dual Whole House Air Cleaners and Furnace in Communicating Mode
249
Display Features
250
Air Cleaner Operation
250
Set-Up Mode
250
Set-Up Mode of Operation
250
Pre-Filter Settings
251
Collection Cells Cleaning Setting
251
Field Charger Power Level Setting
251
Fault Codes
252
Fault Codes Retrieval
252
Cleaning
255
Cleaning Instructions
255
Vacuum Cleaning
256
Pre-Filter
256
Collection Cells
256
Testing the Power Door
262
Pressure Drop
262
LED Troubleshooting
263
Flow Charts
264
Component Failure Evaluation
264
Component Failure Evaluation in 24 Volt Mode
265
Component Failure Evaluation in Communicating Mode
266
Alert Code Response Communicating Systems Reference
267
Communicating Systems Troubleshooting Guide
271
Wait
271
Error 10: Ignition Means Fault
271
Error 18: Control Failure
271
Error 22: Soft Lock-Out Due to Flame Loss or Ignition Retries
272
Error 53: Outdoor Sensor Missing
274
Error 54: Faulty Humidity Sensor
274
Error 64: Stuck Button(S)
274
Error 67: Temperature Sensor Fault
274
Error 89: Equipment Missing
276
Error 90: Communication Busy Fault
276
Error 91: Communication Fault
276
Error 93: Gas Valve Fault
278
Error 101: Y1 Relay Fault
279
Error 104: Heater Relay Fault
279
Error 105: Heater Interlock Relay Fault
280
Error 107: Repetitive Arcing
281
Error 108: HV Output Fault
281
Error 109: Input Current Fault
281
Error 113: Liquid Pressure Sensor Fault
282
Error 114: PM Bad or Missing
282
Error 125: Input AC Voltage Fault
283
Error 126: Equipment Change Alert
284
Error 139: 24V Communication Mismatch
284
Miscellaneous Alert Codes
284
Pressure Switch Failure
284
Low Flame Signal
285
Twinning Error
285
Flame Lost or Ignition Failed
286
Line Polarity Fault
286
A/C Line Fault
286
Ground Fault
287
Communication Busy Fault
287
Fuse Failure
288
PM Bad or Missing
288
Temperature Sensor Failure
289
Demand Configuration Fault
289
Air Handler Fault LED - Solid on
289
Air Handler Fault LED - 2 Flash
289
Outdoor Unit Fault Led's
291
Outdoor Unit Fault LED 1 Flash
291
Outdoor Unit Fault LED 2 Flash
291
Outdoor Unit Fault LED 3 Flash
291
Outdoor Unit Fault LED 4 Flash
291
Outdoor Unit Fault LED 7 Flash
291
Outdoor Unit Fault LED 10 Flash
291
Outdoor Unit Fault LED 11 Flash
292
Outdoor Unit Fault LED 12 Flash
292
Outdoor Unit Fault LED 13 Flash
292
Outdoor Unit Fault LED 14 Flash
292
Outdoor Unit Fault LED 17 Flash
292
EEV Fault LED 1 Flash
293
EEV Fault LED 2 Flash
293
EEV Fault LED 3 Flash
293
EEV Fault LED 4 Flash
293
EEV Fault LED 5 Flash
293
EEV Fault LED 6 Flash
293
EEV Fault LED 7 Flash
293
EEV Fault LED 8 Flash
293
EEV Fault LED 9 Flash
293
EEV Fault LED 10 Flash
293
Communicating Systems Reference
295
Err 91 Displayed at the Comfort Control
296
When Err 91 Is Displayed at the Comfort Control, Thermostat will Go to off
296
Troubleshooting Err 91 Displayed at the Comfort Control
297
Troubleshooting IND COMM ERR
298
Inducer Motor Drive Board LED Functions
298
System Communication Troubleshooting
304
Troubleshooting BLW COMM ERR
304
Communicating System Voltage Readings
308
Normal Operating Voltage
308
Voltage Readings Made at the Furnace or Air Handler LVTB
309
Voltage Readings Made at the Comfort Control Sub Base
309
Voltage Readings Made at the Outdoor Unit
309
Voltage Readings Made at TAM
309
Communicating Voltage to Blower Motor and Furnace Inducer Drive Board
309
Furnace IFC
309
Air Handler
309
Communicating Systems Reference
311
Field Wiring Diagrams
313
Communicating Controller with Communicating Outdoor & Indoor Unit
313
Communicating Controller with Communicating Indoor Unit & Single Stage AC Outdoor Unit
314
24 Volt Thermostat with Communicating Outdoor Unit & 24V Harness Kit #BAYACHP024A
315
Three-Stage Gas Furnace
318
Multi Stage Automatic Gas Valve
319
Gas Furnace
320
Pressure Switch Matrix Chart
320
Communicating Systems Troubleshooting Checklist
321
Alert Code Guide
323
User Interface Assembly
324
User Interface Menu
325
Outdoor Sensors
326
Ambient Sensor & Coil Sensor
326
Liquid Line Sensor
327
Liquid Line Pressure Transducer
327
External Accessory Temperature Sensor BAYSEN01ATEMPA
328
Software Change History
329
COMSYS Air Handler Update
329
Control Board
329
Airflow (Lower than Expected)
330
Re-Flashed Air Handler Motor
331
EEV History - CNT05129
331
EEV History
331
Charge Assist Control Board
332
Comfort Control
332
COMSYS Furnace Update
332
Control Board CNT4829
332
Control Board
333
Airflow (Lower than Expected)
333
4
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Trane ACONT900AC43UA Specifications
General
Brand
Trane
Model
ACONT900AC43UA
Category
Air Conditioner
Language
English
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