2.4 Vitocal 222/242/333/343-G, one heating circuit without mixer, DHW heating (for
Vitocal 242/343-G also solar) plus natural cooling
ID: 4605086_1304_05
Note
DHW heating with solar backup is only possible with the
Vitocal 242/343-G.
A system volume of at least 3 litres per kW of heat pump output is
required.
This scheme is not suitable for the Vitocal 333-G NC.
Application range
Detached house with underfloor heating system and cooling
demand.
Main components
■ Vitocal 222/242/333/343-G with integral DHW cylinder and
Vitotronic 200, type WO1C
■ Heating circuit distributor with heating circuit without mixer
■ Cooling with NC-Box
■ Solar thermal system (option, only with the Vitocal 242/343-G)
Requirements
The minimum flow rate of heat pump
1
is safeguarded by overflow
valve
oW
and the integral secondary pump. In these heating systems,
install an overflow valve at the heating circuit distributor of the under-
floor heating system that is furthest away from the heat pump. This
safeguards a minimum volume of circulating water, even in sealed
heating circuits.
Central heating by heat pump
Heat pump
1
and the integral primary pump start if the actual tem-
perature captured by the return temperature sensor in the secondary
circuit is lower than the temperature set at control unit
2
or for DHW
heating.
Heat pump
1
supplies the heating circuit with heat. Control unit
2
of heat pump
1
regulates the heating water flow temperature and
thereby the heating circuit. The integral secondary pump delivers the
heating water via a 3-way diverter valve either to the heating circuit or
to the integral DHW cylinder.
Opening and closing the valves of the underfloor heating distributor
regulates the flow rate within the heating circuit. Heat pump
1
and
the secondary pump are switched off once the actual return tempera-
ture at the return temperature sensor exceeds the temperature set at
the control unit.
DHW heating by heat pump
In the delivered condition, DHW heating by heat pump
1
is given
priority over the heating circuit and takes precedence at night.
The heat demand is issued via the integral cylinder temperature sensor
and the control unit, which controls the integral secondary pump in
conjunction with the integral 3-way diverter valve and, in the case of
the Vitocal 242/343-G, the cylinder loading pump.
The control unit raises the flow temperature to the value required for
DHW heating.
The control unit switches the heating flow to the heating circuit via 3-
way diverter valve "Heating/DHW" if the actual temperature at the cyl-
inder temperature sensor exceeds the value set at the control unit.
The flow temperature can be raised > 60 °C via integral instantaneous
heating water heater
4
.
DHW heating with solar backup (only for Vitocal 242/343-G)
The DHW cylinder will be heated by the solar collector if the temper-
ature differential between collector temperature sensor
rR
and the
integral lower cylinder temperature sensor exceeds the temperature
differential set at the control unit. For this, the heat pump control unit
controls solar circuit pump
rE
which is integrated into Solar-Divicon
rW
.
The control unit stops solar circuit pump
rE
again if the temperature
falls below the temperature differential.
Natural cooling function
The building can be cooled with the heat pump in conjunction with NC-
Box
iP
(accessories). Control unit
2
enables the natural cooling
function as soon as the outside temperature exceeds the cooling limit
temperature that can be adjusted at control unit
2
. This enables the
components of NC-Box
iP
. The cooling circuit pumps
iW
and
iR
operate continuously. The NC-Box with mixer operates in accordance
with a cooling curve. The mixer on the brine side ensures a continuous,
demand-dependent utilisation of the primary source.
Contact humidistat
iE
monitors the dew point (part of the NC-Box
standard delivery). Ensure that any installed room thermostats are
able to be opened manually or by servomotors when using the cooling
function.
Required parameter settings
ID: 4605086_1304_05
Parameter Value Function
7000 2 With heating circuit A1/HC1, DHW cylinder (delivered condition)
7A00 3 Solar control module, type SM1
7100 2 Natural cooling NC-Box with mixer
7101 1 Cooling via heating circuit A1/HC1
7103 180 Min. flow temperature, cooling
7104 50 Influence room temperature hook-up cooling circuit
7111 4 Cooling curve slope
C002 2 Variable speed solar circuit pump with PWM activation
2003 1 Vitotrol 200A or 300B remote control activated for heating circuit A1/HC1
Vitocal 222-G/242-G/333-G/333-G NC/343-G
(cont.)
20
VIESMANN
System examples
2
5822 472 GB
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