Viessmann VITOLIGNO 300-P Service Instructions Manual page 96

Troubleshooting
Repairs
(cont.)
■ Max. power loss ≤ 2.5 W
■ Fuse for the power supply unit, air
damper drives, charge and discharge
motor, and the vacuum module
High limit safety cut-out
■ Set to 100 °C in the delivered condition
■ Electromechanical temperature
switch according to the liquid expan-
sion principle with lockout
■ Intrinsically safe; lockout also occurs if
the capillary tube leaks or ambient
temperatures below −10 ºC
Boiler, buffer cylinder, cylinder and collector temperature sen-
sors
Connection
See chapter "Connection and wiring dia-
gram" from page 133.
96
■ Limits the boiler water temperature to
the maximum permissible value by
shutdown and lockout
■ Central fixing M10, capillary 1000 mm
long; sensor 7 6.5 mm, 65 mm long
■ Electrical test in accordance with VDE
0701 [or local regulations]