43
5680 011 -10
Viessmann AirflowPLUS AH2A Installation, Operating and Service
Note:
The fan motor operates independent of the
controller temperature control logic. Externally
installed temperature sensors operate as system
safeties only.
Checking ECM (DC) Fan Motor Connections
Pin number
1 Common C1
2 W/W1
3 Common C2
4 Delay tap select
5 Cool tap select
6 Y1
7 Adjust tap select
8 Output -
9 Return (reversing) valve (heat pump only)
10 Humidistat (BK)
11 Heat tap select
12 24VAC (R)
13 2nd stage heat (EM/W2)
14 2nd stage cool (Y/Y2)
15 Fan (G)
16
ECM Motor Control
Connector
(female)
Control
(male)
Service