59
5680 011 -10
Viessmann AirflowPLUS AH2A Installation, Operating and Service
Legend
AC Line
1
115VAC line
2
115VAC neutral
Pump (PMP)
1
115VAC neutral (switched)
2
115VAC line
XFO
1
24VAC
2
N/C
3
24VAC-COM (GND)
XFI
1
115VAC line
2
115VAC neutral
ECM Power
1
N/C
2
N/C
3
N/C
4
115VAC neutral
5
115VAC line
ECM Control
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 valve (heat pump only)
qP
Humidistat (BK)
Heat tap select
qW
24VAC (R)
qE
2nd stage heat (EM/W2)
qR
2nd stage cool (Y/Y2)
qT
Fan (G)
qZ
Electrical Connections
(continued)
Legend
1 Diagnostic LED
2 Ambient temperature sensor
3 Return air temperature sensor
4 Discharge air temperature sensor
5 Freeze protection temperature sensor
7 Supply water temperature sensor
8 A/C power
9 Pump motor
10 24VAC transformer secondary
11 24VAC transformer primary
12 ECM power
13 ECM control
12
11
10
9
8
7
5
4
3
2
1
Additional Information
