Adapting the appliance to the heating system
Installation instructions geoTHERM 0020051574_04
69
9
9
Adapting the appliance to the heating
system
To operate the heat pump economically, it is important to
match the control system to the customer’s heating system
and to the pattern of use.
In the following chapter, all the functions of the weather-
controlled energy balance controller will be explained.
9.1
Operating modes and functions
Five operation modes are available for each heating circuit:
–
Auto:
The operation of the heating circuit alternates
between the “Heating” and “Energy sav” operation
modes according to a settable time programme.
–
Eco:
The operation of the heating circuit alternates
between the “Heating” and “Off” operation modes
according to a settable time programme. The heating cir-
cuit is switched off in the energy saving period, provided
the frost protection function (depending on the outside
temperature) is not enabled.
–
Energy sav:
The heating circuit operates at the set-back
temperature regardless of any settable timer pro-
gramme.
–
Heating:
The heating circuit is operated at the flow tar-
get value independently of any settable timer pro-
gramme.
–
Off:
The heating circuit does not operate, provided the
frost protection function (depending on the outside tem-
perature) is not enabled.
Three operation modes are available for connected domes-
tic hot water cylinders:
–
Auto:
Cylinder charging or enablement for the circula-
tion pump is released according to a settable time pro-
gramme.
–
On:
Cylinder charging is permanently enabled, i.e. the
cylinder is immediately reheated as required. The circula-
tion pump is permanently in operation.
–
Off:
The cylinder is not heated. The circulation pump is
not operating. The cylinder is reheated to 15 °C for frost
protection reasons only when the cylinder temperature
falls below 10 °C.
9.2
Automatic functions
Frost protection functions
The heat pump is equipped with two frost protection func-
tions. A frost protection requirement is provided by the
compressor (regulated frost protection for unit, heating cir-
cuit and domestic hot water cylinder), provided that the
heat pump has not been permanently switched off because
of a fault. If the heat pump is permanently switched off
because of a fault, the set auxiliary heater starts up even if
it has not been enabled for normal heating and hot water
handling
(Emergency frost protection according to the set-
ting for unit, heating circuit and/or domestic hot water cyl-
inder) (
Menu C7
) (
¬
Tab. 9.6
).
Regulated frost protection for heating
This function ensures that your heating installation is pro-
tected from frost in all operating modes.
If the outside temperature falls below 3 °C and at that time
no time window of a time programme is active (i.e. with
operation mode “Off” or with “Eco”outside a time window),
a start-up temperature requirement with the energy saving
target value for room temperature is generated with a
default delay of one hour after the condition has occurred.
The frost protection requirement is cancelled when the out-
side temperature again rises above 4 °C.
Regulated frost protection for domestic hot water cylin-
der
This function is also active in the operating modes “Off”
and “Auto”, regardless of time programmes.
This function starts automatically if the cylinder actual tem-
perature of a connected domestic hot water cylinder falls
below 10 °C. The cylinder is then heated to 15 °C.
Emergency frost protection function
The emergency frost protection function automatically acti-
vates the set auxiliary heater according to the setting for
the central heating and/or hot water handling.
If the heat pump is permanently switched off as a result of
a fault and the outside temperature is below 3 °C, the auxil-
iary heater is enabled without time delay for the emer-
gency frost protection mode, provided that the operating
mode “Auto” or “Heating” has been set. The flow tempera-
ture target value is limited to 10 °C in order not to waste
too much energy unnecessarily during emergency opera-
tion with the auxiliary heater. Enablement is cancelled when
the outside temperature rises above 4 °C.
If a buffer tank is connected, it is heated when the tempera-
ture sensor VF1 measures < 10 °C. Cylinder charging is
switched off if the temperature sensor RF1 measures
> 12 °C.
If a domestic hot water cylinder is connected, it is heated if
the temperature sensor measures < 10 °C.
Cylinder charging is switched off if the temperature
sensor SP measures > 15 °C.
