Viessmann Vitocal 222-G User Manual page 71

Vitocal 300-G/350-G
4.2 Vitocal 300-G/350-G with one heating circuit without mixer, DHW heating and natural
cooling function via NC-Box with mixer
ID: 4605350_1304_03
Application range
Detached house with underfloor heating circuit eP and cooling
demand. Size DHW cylinder wP in accordance with current standards
and requirements.
Main components
■ Vitocal 300-G/350-G, type BW or BWC
■ Vitotronic 200, type WO1B
■ DHW cylinder
■ NC-Box
Requirements
4
The minimum flow rate of heat pump 1 must be safeguarded by sec-
ondary pump 6 and overflow valve eW. The heating line and overflow
valve must be matched up.
Central heating by heat pump
Heat pump 1, primary pump 5 and secondary pump 6 start if the
actual return temperature is lower than the set temperature selected
at control unit 2.
Heat pump 1 supplies heating circuit eP with heat. Control unit 2
regulates the flow temperature of heating circuit eP. Subject to
demand, secondary pump 6 delivers heating water to heating circuit
eP, or via circulation pump for cylinder heating 7 to DHW cylinder
wP.
Type BWC:
Subject to demand, integral secondary pump 6 or circulation pump
for cylinder heating 7 delivers heating water either to heating circuit
eP or DHW cylinder wP.
Required parameter settings
ID: 4605350_1304_03
Parameter
7000
7100
7101
7103
7104
7111
2003
VIESMANN
76
(cont.)
Value Function
2 With heating circuit A1/HC1, DHW cylinder (delivered condition)
2 Natural cooling NC-Box with mixer
1 Cooling via heating circuit A1/HC1
180 Min. flow temperature, cooling
50 Influence room temperature hook-up cooling circuit
4 Cooling curve slope
1 Vitotrol 200A remote control activated for heating circuit A1/HC1
Opening and closing the valves at the distributor regulates the flow rate
within heating circuit eP.
Heat pump 1 and primary pump 5 are switched off once the actual
return temperature at the return temperature sensor exceeds the tem-
perature set at control unit 2.
DHW heating by heat pump
In the delivered condition, DHW heating by heat pump 1 is given
priority over heating circuit eP and takes precedence at night.
The heat demand is issued via cylinder temperature sensor wQ and
control unit 2, which controls circulation pump for cylinder heating
7. Heat pump 1 raises the flow temperature to the value required
for DHW heating.
Type BWC:
The heat demand is issued via cylinder temperature sensor wQ and
control unit 2, which controls integral circulation pump for cylinder
heating 7.
DHW reheating can be provided by an electric booster heater (e.g.
immersion heater inside the DHW cylinder).
If the set cylinder temperature selected at control unit 2 is exceeded,
control unit 2 switches circulation pump for cylinder heating 7 off
and starts secondary pump 6 in the case of heat demand from heat-
ing circuit eP. Heating circuit eP is supplied with heat.
The flow temperature can be raised above 60 °C with instantaneous
heating water heater 4.
Natural cooling function
The building can be cooled with heat pump control unit 2 in conjunc-
tion with NC-Box rP (accessories). The natural cooling function is
enabled by control unit 2 as soon as the outside or room temperature
(cooling limit temperature) that can be selected at control unit 2 is
exceeded. Circulation pumps rQ and rW in the NC-Box start and 3-
way diverter valve rR switches to cooling. Heat is now extracted from
the room via heating circuit eP and transferred to the brine circuit via
the plate heat exchanger in the NC-Box. The brine circuit transfers the
heat to the ground via geothermal probe qW. DHW can be heated by
heat pump 1 whilst cooling mode is operational.
System examples