Viessmann VITODENS 200-W B2HE 85 Installation Instructions Manual page 29

Vitodens 200-W B2HE 85, 120, 150, 199 Installation
Electrical Connections
View of B2HE 120/150
Legend
A Diaphragm grommets for low voltage connections
B On/Off switch
C Knockouts for line voltage connections
No connected combustion air device
Dry contact combustion air device
feedback
24VAC combustion air device with dry
contact feed back
(continued)
On-site connections
Bundle cables using cable ties.
Never route low voltage cables next to line voltage
(120VAC or greater).
Secure the cables on the underside using the supplied
cable ties.
Do not route cables over sharp edges.
IMPORTANT
If connecting cables/leads come into contact with hot
components, they will be damaged. When routing and
securing cables/leads on site, ensure that the maximum
permissible temperatures for these cables/leads are not
exceeded.
Connecting the combustion air device to the CAI plug
A motorized combustion air supply (e.g. fan or combustion
air damper) with or without feedback signal can be
connected to the CAI plug.
When the boiler receives a call for heat, the burner does
not start until the feedback signal is present. If a device
without feedback signal is used, the jumper across R and
W must remain in place.
If a device with feedback signal is used, the jumper must
be removed.
Boiler Connections
29