Viessmann Vitodens 100-W B1HF Series Installation And Service Instructions Manual page 95

(cont.)
R
P
O
N
M
L
K
H
G
Fig. 61
A1 HBMU heat management unit
A3 Programming unit with communication module
X... Electrical interfaces
G Flow sensor (combi boiler only)
Connection and wiring diagram
Water pressure sensor
H
Flue gas temperature sensor
K
Boiler water temperature sensor
L
Circulation pump (PWM)
M
95