Technical data

131
Function description – Vitocontrol-S, VD2/CT3/CM2
Heating circuit control (continued)
Domestic hot water temperature
With priority control:
The set supply temperature will be
set to 0˚C / 32˚F during DHW
heating.
The mixing valve closes, and the
heating circuit pumps are switched
OFF.
Without priority control:
The heating circuit control unit
continues to operate with the same
set value.
Room temperature
In conjunction with remote control and
room temperature input (observe
coding address b0).
Compared to the outdoor temperature,
the room temperature has a greater
influence on the common set supply
temperature. This influence may be
adjusted via coding address b2.
In conjunction with the mixing valve
circuit:
For control differences (actual value
deviation) above 2˚C / 3.6˚F room
temperature, the influence can be
increased again (via coding address b6,
quick heat-up/quick setback).
Quick heat-up:
The set room temperature must be
raised by a minimum of 2˚C / 3.6˚F
by:
Pressing party button .
Changing from heating with reduced
temperature to heating with normal
temperature.
Start-up optimisation.
Quick heat-up will stop when the set
room temperature has been reached.
Quick setback:
The set room temperature must be
reduced by a minimum of 2˚C / 3.6˚F
by:
Pressing economy button .
Changing from room heating with
normal temperature to heating with
reduced temperature.
Shutdown optimisation.
Quick setback will stop when the set
room temperature has been reached.
Heating circuit pump logic
(economy circuit)
The heating circuit pump is switched
OFF (set supply temperature set to 0˚C /
32˚F), when the outdoor temperature
exceeds the value selected via coding
address A5.
Extended economy circuit
The heating circuit pump is switched
OFF, and the set supply temperature is
set to 0˚C / 32˚F, if:
The outdoor temperature exceeds the
value selected via coding address A6.
The set room temperature is reduced
via coding address A9.
In conjunction with the mixing valve
circuit:
The mixing valve has been closed for
12 minutes (mixing valve economy
function, coding address A7).
When the actual room temperature
exceeds the value set at coding
address b5.
Slab curing function
(only in conjunction with a mixing valve
circuit).
Please note:
Four different temperature profiles can
be selected for drying the slab. These
profiles are activated via coding
address F1.
When the slab curing function is
activated, the heating circuit pump of
the mixing valve circuit is switched
ON, and the supply temperature will be
held at the selected profile. After
completion (30 days), the mixing valve
circuit will be regulated automatically
via the set parameters.
System dynamics – mixing valve circuit
(only in conjunction with a mixing valve
circuit)
You can influence the control
characteristics of the mixing valve via
coding address C4.
Central operation
Central operation for all downstream
heating circuits can be programmed via
coding address 7A.
The heating and holiday program then
applies to all heating circuits in the
system.
The programming unit of the other
heating circuits displays central control
when the heating program and holiday
program buttons are activated.
Any set holiday programs in the
heating circuit programming units will
be deleted.
Party and economy buttons on all
control units are without effect.
Frost protection
When the outdoor temperature falls
below +1˚C / 34˚F, a supply
temperature of at least 10˚C / 50˚F
will be safeguarded.
For changes, see coding address A3,
variable frost limit.
5351 340 v1.4