Table of Contents
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Startup
Operation
Service
Additional Information
4
Viessmann AirflowPLUS AH2A Installation, Operating and Service
Quick Check.............................................................36
Pre-start Checklist.....................................................36
Startup Procedure....................................................37
Air handlers LED Indications for Temperature...............37
Installing Connection Board........................................38
Installing the Access Panels.......................................38
Indicators................................................................39
Flashing LED............................................................39
Normal Operation......................................................39
Heating mode.....................................................39
Cooling mode......................................................39
Summary............................................................39
External Heat Demand via Switching Contact -
Boilers equipped with HO1B User Interface..................40
Heating System Operation - Vitodens 100 WB1B..........40
DHW Contact for Air Handler - Vitodens 100 WB1B......41
Illuminated Alarm Indicator.........................................42
Home freeze protect............................................42
Temperature sensor failure....................................42
Alarm Relay and LED Fault Codes..............................43
Control LED flash codes.......................................43
Alarm.................................................................43
Checking ECM (DC) Fan Motor Connections.................44
Troubleshooting.......................................................45
Service and Maintenance...........................................49
Checking temperature sensor................................49
Installed sensors..................................................49
Failed sensors......................................................49
Air filter..............................................................49
Circulator...........................................................49
Coils..................................................................49
System Layout 1......................................................50
System Layout 2......................................................51
System Layout 3......................................................52
System Layout 4......................................................53
System Layout 5......................................................54
System Layout 6......................................................55
System Layout 7......................................................56
System Layout 8......................................................57
System Layout 9......................................................58
System Layout 10....................................................59
Electrical Connectors.................................................60
Technical Data.........................................................62
Parts List.................................................................63
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