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Viessmann AirflowPLUS AH2A Installation, Operating and Service
Checking ECM (DC) Fan Motor Connections
ECM Motor Control
Control
(male)
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 Output +
Connector
(female)
Note: The fan motor operates independent of the
controller temperature control logic. Externally
installed temperature sensors operate as system
safeties only.
Service
43
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