Operating instructions

4
System design
System design
Dual mode DHW heating with VitocellĆBĂ100 or VitocellĆBĂ300
DHW heating without solar energy
The upper indirect coil of the DHW
cylinder is heated by a boiler. The
cylinder thermostat with cylinder
temperature sensorĂ6 of the boiler
control unit switches cylinder
loading pumpĂ7
Ă.
DHW with solar energy
When a temperature difference
higher than the start-up temperature
differentialĂDO set in control unitĂ1
is measured between collector
temperature sensorĂ2 and cylinder
temperature sensorĂ3, solar circuit
pumpĂ4 is switched ON and the
DHW cylinder is heated up. The pump
will be switched OFF if the actual
temperature falls below shutdown
temperature differentialĂDF.
The temperature in the DHW cylinder
is limited by the electronic
temperature limiter (safety shutdown
at 90ĂºC) in control unitĂ1 or by high
limit safety cut-outĂ5 (if required).
When the preset temperature is
exceeded, these devices switch OFF
solar circuit pumpĂ4.
The pasteurisation requirements are
met by circulation pumpĂ8 and
sufficient heat input. Circulation
(relayering) starts if 60ĂºC is not
reached inside the DHW cylinder.
ĂSafety instructions
With temperatures higher than 60 ºC,
limit the DHW temperature to 60 ºC
by installing a mixing device, e.g. a
thermostatic mixing valve (DHW
cylinder accessory). The mixing
equipment does not prevent the risk
of scalding at the tap. The
installation of a mixer tap at the
draw-off point is required.
5862Ă490ĂGB