Manual Vaillant VRS 620-3 (page 198 of 208) (English)

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Installation instructions auroMATIC 620 0020094404_00 controller 140

Loadpump overrun

The cylinder charging pump overrun starts after swit-

ching off of the boiler at the end of the cylinder

charging. During this time, no temperature requirement

is required from the heater(s) which have carried out

the cylinder charging. All other functions (controlling of

the charging pump/switching valve) remain on during

this period of time. This

function is used to supply the high inlet temperatures

required for charging the cylinder to a great extent

before the heating circuits, in particular the burner cir-

cuit, are enabled again.

Maximum limit outside temperature

The maximum limit outside temperature is the outside

temperature at which the demand-dependent heating

shutdown (automatic shutdown in summer) takes effect.

The maximum outside temperature limit can be set

separately for each heating circuit within a range of 5

to 50 °C. The default setting is 21 °C. The required room

temperature is set to 20 °C for each heating circuit

(default setting). If the required room temperature is

changed in the basic menu, the maximum limit for the

outside temperature must also be changed (at least 1 °C

higher than the required room temperature).

Maximum preheating

With this function the activation of the heating circuit

before the heating window is made possible, with the

aim of accessing the set day value at the beginning of

the heating window.

The function is only performed for the first heating win-

dow of the day. The beginning of heating is established,

depending on the outside temperature.

Influence of outside temperature:

OT ≤ –20 °C : set preheating period

OT ≥ +20 °C : no preheating period

The period of time is calculated linearly between the

two reference values.

Once preheating has been started, it is only ended once

the time window has been reached (not ended if the

outside temperature rises in the meantime).

Maximum preset switch off

This function is used to avoid unnecessary heating of

the heating system directly before a preprogrammed

set-back time. The calculation of the actual time

depends on the outside temperature of the controller.

The set value merely represents the maximum period of

time desired by the customer. Tf the outside tempera-

ture is at -20°C, there is no preset switch-off; at an out-

side temperature of +20°C, the maximum preset switch-

off comes into effect. At outside temperature between

these two reference values, the controller calculates a

value that corresponds to a linear curve between these

two reference values.

Maximum temperature of heating circuit

The maximum forward flow temperature can be set for

each heating circuit. The calculated flow set target tem-

peratures are limited to the set value.

Maximum temperature of solar cylinder

In order to ensure the highest possible gain from the

solar heating of the cylinder, while at the same time

ensuring that limescale protection is active, you can set

a maximum value for the solar temperature cylinder.

For this purpose, the "Upper cylinder temp." sensor,

SP1, is used for Cylinder 1 if it is connected to the cylin-

der in question. Otherwise, the "Lower cylinder temp."

sensor, SP2, is automatically used. For the second cylin-

der (swimming pool), SP3 is used.

If the set maximum temperature is exceeded, the solar

circuit pump is switched off. Solar charging is only

enabled again once the temperature at the active sen-

sor drops 1.5 K below the maximum temperature.

Minimum temperature for solar circuit and solid fuel

boiler

The minimum temperature for each solar circuit or for

the solid fuel boiler (for hydraulic plans with solid fuel

boilers) can be set in the range 0 ... 99 °C.

Note: The delta-T control will only be enabled when the

temperature at the collector sensor > minimum tempe-

rature.

Note: Does not apply in combination with a VPM S or

VMS solar pump unit.

Minimum temperature of heater

The minimum boiler temperature is used to protect the

boiler, e. g. against corrosion, if, for example, the boiler

has to be operated permanently in the condensate

range due to high water capacities. The setting range is

between 15 and 65 °C (default 15 °C).

Mixing circuit/Mixer control

A mixed heating circuit is a heating circuit which is

decoupled from the boiler circuit (temperature) by an

actuator (mixer).

Night set back temperature

The night set back temperature is the temperature to

which your heating system reduces the room tempera-

ture outside of the programmed time window.

Number of heating appliances

They are usually already configured with the system –

parameter setting is only necessary in exceptional cases

(e.g. removing heating appliances (HA) from the sys-

tem).

Number of steps

The stages are usually already configured with the sys-

tem – parameterisation is only necessary in cases where

a two-stage burner is to be actuated in a single stage.

Glossary

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Others manual(s) of Vaillant VRS 620-3

Vaillant VRS 620-3 User Manual - German - 52 pages

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Vaillant VRS 620-3 User Manual - French - 204 pages

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Vaillant VRS 620-3 Manual

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