Viessmann VITOCAL 300, Installation And Service Instructions Manual

Page: 112 / 160

Prerequisite: The natural cooling
function is enabled at the heating cir-
cuit (see page 111).
The cooling limit temperature defines
the outside temperature, exceeding of
which triggers the natural cooling
function.
The cooling limit temperature is the
result of the selected set room tem-
perature and the temperature entered
under "
cooling limit > T room ".
Example:
The selected set room temperature is
20 °C; the temperature entered under
"
cooling limit > T room " is 4.0 K. The
natural cooling function starts if the
average outside temperature exceeds
24 °C (cooling limit temperature).
If the outside temperature drops to
less than 23 °C, the natural cooling
function is switched off because of the
specified hysteresis of 1 K.
A
Set room temperature
B
Cooling limit temperature
C
Selected value " Cooling limit > T
room "
D
Average outside temperature
E
Cooling function ON
F
Cooling function OFF
Access
& " System settings "
& " Program "
& " Heating circuit "
& " Heating circuit 1/2 "
&
"Cool. limit > T room "
(
5
/
%
)
Standard setting 4.0 K
Setting range 2.0 to 20.0 K
Level/Slope, cooling curve
Prerequisite:
The natural cooling function is
enabled (see page 111).
A specific outside temperature can be
assigned to a certain cooling circuit
flow temperature using the "
Cooling
curve level " and "Cooling curve
slope " parameters.
The "Cooling curve level" parameter
moves the cooling curve along the
flow temperature axis, and the
"Cooling curve slope" parameter
assigns a lower flow temperature to
the same outside temperature if there
is a greater slope.
Cooling limit > room temperature (cooling limit temperature)
112
Heating circuit control settings
55
92
901
GB