Viessmann SCU224 Manual de Serviço descarregar pdf (Página 22)

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SCU224

5.1Various:

Pump starts for a short moment, switches-on/off

repeatedly

Is the temperature diffe-

rence at the controller

too small?

no yes

Wrong placing of the

collector sensor?

yes

Change∆Ton and ∆Toff

accordingly.

Mount the collector sen-

sor at solar feed flow

(warmest collector out-

put); use the sensor well of

the respective collector.

Pump starts up very late and stops working soon.

The temperature difference between tank and collector

increases enormously during operation; the collector cir-

cuit cannot dissipate the heat.

Collector circuit pump

defect ?

no yes

Heat exchanger calciﬁed?

yes

Repair / Replace

Decaliﬁcation

Heat exchanger plugged?

yesno

Cleaning

Heat exchanger too

small?

yes

New calculation of the

dimension.

Activate option tube coll-

ector special function

Change∆Ton and ∆Toff

accordingly.

Switch-on-temperature

difference ∆Ton too

large?

no yes

Collector sensor un favour-

able placed (e.g. contact

sensor instead of sensor

well.

o.k.no

Pump is overheated, but no heat is being transferred from

collector to the tank, feed ﬂow and return ﬂow are equally

warm, possibly also bubble in the tubes

Exhaust the system; incre-

ase system pressure to

the minimum pressures

listed in the Vitosol Start-

up and service manual.

Switch the pump on and

off for a short time

Air in the system?

no yes

Is the collector circuit

blocked at the dirt trap?

yes

Clean the dirt trap

If necessary activate tube

collector function.

yes

o.k.

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