Viessmann SCU224 Manual de Serviço descarregar pdf (Página 23)

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23 |

SCU224

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Tanks are cooled during the night.

Does collector circuit

pump run during the

night?

no yes

Check the controller

functions

Collector temperature is

at night higher than ambi-

ent temperature.

no yes

Check the supply and re-

turn line ﬂow check valves

to ensure functionality.

Is the tank insulation

sufﬁcient?

yes no

Intensify the insulation.

Is the tank insulation clo-

se enough to the store?

yes no

Replace or intensify the

insulation.

Are the tank connections

insulated?

yes no

Insulate connections.

Warm water outﬂow

upwards?

no yes

Change connection and

let the water flow side-

wards or through a ther-

mosiphon trap; less tank

losses now?

Does warm water re-

circulation pump run for

a very long time?

no yes

Use the re-circulation

pump with timer and

switch-off thermostat (en-

ergy efﬁcient circulation)

The solar circuit pump does not work although the colle-

ctor is obviously warmer than the tank.

Does the control LED

ﬂash?

yes no

Does the pump start up

in manual operation?

yes

There is no current; check

fuses / replace them and

check power supply.

The adjusted tempe rature

difference for starting the

pump is too high; choose

a matching setting

no

Is the power supply to

the pump coming from

the controller?

yes

Is the pump stuck?

Put the pump into operati-

on by means of a screwdri-

ver; is it passable now ?

Is the pump out of order?

- replace if necessary

Are the fuses o.k.?

Controller seems to be

defective - replace it.

no

yes

no

no yes

Replace the fuses.

Switch-off the re-circulati-

on pump and the isolation

valve for 1 night; less tank

losses?

yes no

Check the pumps of the

after-heating circuit ac-

cording to nightly run and

defective check valve; pro-

blem solved?

no

no yes

o.k.

Control the check valve

in warm water circulati-

on- o.k.

yes no

Please also check further

pumps which are con-

nected to the solar tank.

The gravitation circu-

lation in the circulation

line is too strong; insert a

stronger check valve or an

electrical 2-way valve be-

hind the circulation pump;

the 2-way valve is open in

pump operation, other-

wise it is closed, conect

pump and 2-way valve in

parallel; activate the cir-

culation again!

Cleaning or replacement.

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