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Additional Information
Electrical Connections
WARNING
DISCONNECT POWER BEFORE
SERVICING BOILER.
If any of the original wires as
supplied with the appliance must be
replaced, it must be replaced with
the exact equivalent.
CAUTION
Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous
operation. Verify proper operation
after servicing.
58
Viessmann AirflowPLUS
Connection Board
Thermostat - field supplied
(optional two stage
cooling shown)
Viessmann AirflowPLUS AH2A Installation, Operating and Service
External Connections
Internal Connections
Power Connection
Terminal
AC Line
PMP
XFO
XFI
ECM
Power
ECM
Control
Dry Contacts
A/C Relay Heat Fan
Alarm
Main power supply
120VAC, 1Ph, 60Hz, 12A
Main
Disconnect
Switch
>
Door Safety
Switch
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