Vaillant geoTHERM SERIES Service Manual download pdf (Page 15)

15Operating Manual geoTHERM exclusive VWS 0020071929_00

5.3.2 Energy balance control

Energy balance control applies only to hydraulic sys-

tems without buffer cylinders (e.g. hydraulic plan 6).

For economical and fault-free operation of a heat pump,

it is important to regiment the starting of the compres-

sor. The start-up of the compressor is the point at which

the highest loading occurs. With the help of the energy

balance controller it is possible to minimise starts of the

heat pump without compromising the comfort of a

pleasant room atmosphere.

As with other weather-controlled heating controllers the

controller determines a supply set target temperature

by capturing the outside temperature through a heating

curve. The energy balance calculation is carried out

based on this supply set target temperature and the

supply real temperature the difference of which is

measured per minute and added up:

1 Degree minute [°min] = 1 K Temperature difference in

the Course of 1 Minute

The heat pump starts up at a defined heat deficit and

only switches off again when the supplied heat is equal

to the heat deficit.

The larger the preset negative numerical value is, the

longer the periods for which the compressor is kept run-

ning or at standstill.

5.3.3 Buffer cylinder charging principle

The buffer cylinder is controlled depending on the sup-

ply set target temperature. The heat pump heats when

the temperature of the buffer cylinder head tempera-

ture sensor VF1 is smaller than the set target tempera-

ture. It continues to heat until the buffer cylinder floor

temperature sensor RF1 has reached the set target tem-

perature plus 2 K.

In the connection to a hot water cylinder charging the

buffer cylinder is also charged when the temperature of

the head temperature sensor VF1 is less than 2 K higher

than the set target temperature (premature reheating):

VF1 < T VL set + 2 K.

5.3.4 Resetting to factory settings

Caution!

Inadvertent deletion of specific settings!

When you reset the control system to

the default settings, specific system

settings can be deleted and the system

can sut down. The system does not suf-

fer damage.

• In the basic display on the graphic display press both

dials at the same time for min. 5 sec.

After that you can select whether to reset only the

timer programme or all values to the default settings.

5.3.5 Control structure

The Top level display is a Graphics display. It is the

starting point for all the available displays. This display

reappears automatically if you do not actuate any of the

dials for a long time when setting values.

Controller operation is subdivided into four levels:

The Operator level is specified for the operator.

In Sect. 5.4 all of the controller's displays are shown as

a flow diagram. A detailed description of the displays is

contained in Sect. 5.5.

The Code level (menu C1 - C9, D1 - D5, I1 - I5 and A1 - A9)

is reserved for the engineer and protected by a code to

protect it from unintentional modification.

As the operator you can scroll through the menus of the

code level and view the system-specific setting parame-

ters however without changing the values.

In the menus C1 to C9 the engineer sets system-specific

parameters.

The menus D1 to D5 enable the engineer to operate and

test the heat pump in the diagnosis mode.

In menus I1 to I5 you are given general information on

the settings of the heat pump.

Menus A1 to A9 take the engineer through the installa-

tion menu to put the heat pump into operation.

The display and selection of Special function (e.g. the

energy-saving function) is also possible for the operator.

Instructions are given in Sect. 5.6 as to how to activate

the special functions.

The fourth level contains functions for the optimisation

of the system and can only be set by the engineer using

vrDIALOG 810/2.

5.3.6 Adjusting the energy saving functions

Also described in Chap. 5.5 are heat pump settings that

will enable a reduction in your energy costs. This is

achieved by optimum setting of the heat pump's weath-

er-controlled energy balance controller.

This symbol points you to these energy saving tips.

Operation 5

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Vaillant geoTHERM SERIES Service Manual Page 15

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