Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 160

Function description
Heating circuit control
Note
A temperature limiter also needs to be
used with underfloor heating systems.
Frost protection
If the outside temperature falls below
+1.5 °C, a flow temperature of 3 to
35 °C is ensured.
See coding addresses 714, 1014 and
1314 for conversion.
Type room controller
Coding addresses: 759, 1059, 1359
Emissions test function
The appliance can be switched to a spe-
cial mode by pressing the emissions test
mode key. "ª" appears on the display.
Set the output by using rotary selector
"J" (see page 80). The Stirling burner
and the auxiliary burner are switched off.
They are only switched on again when
the Stirling head temperature is
< 150 °C. End the emissions test function
after the tests via the emissions test key
or allow to end after 20 min via "Time
out".
160
(cont.)
The response characteristics of the
appliance are adapted to take account of
the inertia displayed by different heating
systems and the building insulation.