Manual Vaillant VRS 620-3 (page 196 of 208) (English)

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Installation instructions auroMATIC 620 0020094404_00 controller 138

Glossary

Activation duration controlling

Activation duration controlling serves to keep the solar

circuit at the activation value, and thus in operation, for

as long as possible. For this purpose the pump is swit-

ched on and off in periodical thrusts depending on the

collector temperature and lower storage tank tempera-

ture. On reaching the switch-on difference, the function

is started (if activated) with an activation duration of 30

% - i.e. the pump is switched on for 18 s and then swit-

ched off for 42 s. In the temperature difference incre-

ases, the activation duration is increased (e.g. 45 s on,

15 s off). In the temperature difference decreases, the

activation duration is decreased (e.g. 20 s on, 40 s off).

The period length is always a minute.

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

VMS solar pump unit.

Actual flow temperature

The flow temperature actually present in a heating cir-

cuit.

Anti-legionella function

The anti-Legionella function can only be activated glo-

bally for all cylinder charging circuits. When active, the

function is carried out at the predetermined time: 1x

weekly or daily at the selected time, the respective

cylinder and the corresponding hot water pipes are rai-

sed to a temperature of 70 °C. To achieve this, the tar-

get value for the cylinder in question is increased to

68/70 °C (2 K hysteresis) and the corresponding circu-

lation pump is switched on. The function is terminated

when the cylinder sensor measures a temperature

≥ 68 °C for longer than 30 mins, or after a period of 90

mins has elapsed (to avoid getting “stuck“ in this func-

tion if water is drawn simultaneously).

Anti-legionnaire’s disease protection is naturally not

carried out for the swimming pool (storage tank 3).

Peculiarities: If the 230 V contact is configured as an

"Anti-legionella contact", a solar pump is started up via

this contact, which mixes the contents of the solar cylin-

der thoroughly, so that the lower region of the cylinder

can attain the necessary temperature.

If a temperature of > 68 °C has already been reached at

the lower solar sensor through a solar filling, the heater

doesn’t have to be switched on. Then only the anti-

legionnaire’s disease contact and circulation pump are

switched on.

AT continuous heating

Outside temperature below which heating using the tar-

get room temperature/heating curve assigned to the

heating circuit is continuous outside the programmed

time window.

A night time reduction or total switch-off no longer

takes place if the temperature reaches or falls below

the set value.

Bleeding function solar circuit

The solar circuit pump is activated for an adjustable

period of up to 600 minutes from the A7 menu to carry

out bleeding independent of the controller.

Note: This function is not supported in combination with

the VPM S and the VMS, as both solar pump units carry

out bleeding permanently.

Control behaviour of the mixing circuit:

If the current temperature of the mixing circuit deviates

by more than +/- 0.5 K from the target inlet tempera-

ture required by the controller, the mixer valve is actua-

ted via the mixer motor with impulses of variable activa-

tion duration (AD). The duty cycle (voltage signal for

"open" or "closed") depends on the control deviation,

i.e. on the difference between the actual and target flow

temperatures and the conversion factor.

In the default setting, we have pre-set a proportional

band of 12 K, i. e. controlling is performed at a switch-on

ratio of 100 % in the “open” or “closed” direction in the

event of a control deviation of 12 K or more. If control

deviation is, for example, 6 K, the mixer is controlled at

a switch-on ratio of 50 %. Since the period time has a

fixed cycle time of 20 seconds, this means that the

mixer is operated 10 seconds in “open” or “closed”

direction and is at a standstill for 10 seconds.

Cylinder charging circuit/cylinder recharging delay

With the controller, the cylinder charging circuit is used

for the timed enabling of the reheating function. The

reheating takes place within the programmed timer pro-

gramme, provided the target cylinder temperature has

not been reached yet. The cylinder recharging is activa-

ted when the target cylinder temperature is exceeded

by more than 5 K.

In order to avoid unnecessary recharging, a recharging

delay function has been integrated. In this case, if the

solar pump is running, the actual required reheating is

delayed by the preset value. If the solar pump switches

off during the delay period, reheating takes place imme-

diately.

The controller has a factory-set timer program, which

you can customise:

Mon - Fri 5:30 - 22:00

Sat 7:00 - 23:30

Sun 7:00 - 22:00

The preset times do not apply to the VPM W.

Cylinder frost protection

The temperature in the cylinder is always maintained at

a minimum level of 12 °C. The cylinder frost protection

is ineffective if a contact at the cylinder sensor input is

activated (R 0 Ohm – R infinite).

Glossary

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Vaillant VRS 620-3 Manual

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