Viessmann Vitodens 200, Service Instructions Manual

Page: 57 / 116

57
Control unit for constant temperature mode
Changing parameters in service positionsĂ"S
Ă
1" to "S
Ă
7"
(cont.)
S
Ă
6Ăć Limited system frost protection
Limited frost protection for the system can be achieved by switching the
circulation pump ON for 10Ăminutes. You can select the switching frequency.
For setting steps, see pageĂ54.
Parameter Switching cycle
0 Circulation pump will not be
switched on
1 to 24 1 to 24 times daily; switch on
circulation pump
S
Ă
7Ăć M clock thermostat
For setting steps, see pageĂ54.
Parameter Pump function
Without M clock thermostat 0 ćć
With M clock thermostat and
1
Set room
±0.5 Pump "ON" when
room temperature hook-up. Set
boiler water temperature is
2
temperature
hysteresis
±1.0
p
room temperature
hysteresis falls boiler water temperature is
selected by control unit in such a
3
hysteresis
±1.5
hysteresis falls
below its limits. selected by control unit in such a
way that set room temperature
selected on clock thermostat is
4 ±2.0
below its limits.
Pump run-on (S
Ă
1)
will be activated selected on clock thermostat is
maintained inside the room as
5 ±2.5
will be activated
when room temp. maintained inside the room as
accurately as possible. Burner
will be enabled when room
6 ±3.0
when room temp.
hysteresis is
exceeded will be enabled when room
temperature hysteresis falls
7 ±3.5
exceeded.
temperature hysteresis falls
below its limits; burner will be
switched OFF when its limits are
8 ±4.0
switched OFF when its limits are
exceeded.
9
Pump runs continuously
*1
Please note:
For settings 1 to 9, the link on the
MĂclock thermostat must be open
(as delivered condition).
Installation instructions
M clock thermostat
*1
The burner will be constantly enabled as room temperature hysteresis cannot be set.
5692Ă485
G
B