Viessmann Vitotronic 100 GC1 Installation And Service Instructions Manual page 121

Components from the parts list
LON communication module
Plug in the LON communication module into the control
unit. The communication interruption will be displayed.
D
Fixed high limit
In the factory setting set to
120 ˚C / 248 ˚F , adjustable to
110 or 99 ˚C / 230 ˚C or 212 ˚F
(see page 32)
Electromechanical temperature
switch according to the liquid
expansion principle; with lockout
Intrinsically safe; also lockout in case
of capillary tube leaks or ambient
temperatures below –10 ˚C / 14 ˚F
Limits the boiler water temperature
to the maximum permissible value by
shutdown and manual reset
Central mounting M 10, capillary
3600 mm / 142 inches long
Probe ∅ 3 mm / 0.1 inches,
180 mm/ 7 inches long
Tests:
effectiveness via test button
A A
LON LON LON LON LON
C
B
B
Test button
For testing the fixed high limit.
For a description, see page 72.
Components – Vitotronic 100, GC1
A Control unit or Vitocom 300
A
B Interconnecting cable for data
LON exchange between the control
units, part no. 7143 495
C Terminators, (standard delivery –
C
Vitotronic 300-K, MW1S)
D Slots for B and C
Adjustable high limit
In the factory setting set to 95 ˚C /
203 ˚F, adjustable to 100 or 110 ˚C
/ 212 or 230 ˚F (see page 32)
IMPORTANT
Adjust downwards at least 20 ˚C /
36 ˚F higher than the DHW
temperature, upwards at least 15 ˚C/
27 ˚F lower than the fixed high limit.
Electromechanical temperature
switch according to the liquid
expansion principle
Regulates the maximum boiler water
temperature (e.g. in emission test
mode)
Adjusting shaft 6 mm / 0.2 inches
half-round
Adjustment knob pushed on shaft
from front
Capillary 3600 mm / 142 inches long
Probe ∅ 3 mm / 0.1 inches, 180 mm/
7 inches long
Tests:
Effectiveness via emissions test
mode
121