6 Installation
Return booster
Functioning: If cold heating water (temperature <
55°C) flows from the heating circuit/buffer tank into the
hot boiler, the steam contained in the flue gas con-
denses on the "cool" boiler heat exchanger surfaces.
In the long term this leads to corrosion and damage in
the boiler.
To avoid this, hot water from the boiler flow is added to
the boiler return.
Return booster modules with a motor-controlled mixer
perform this task more accurately and reliably than
thermally controlled modules.
In addition, they allow the use of residual heat: When
the temperature in the buffer cylinder has fallen to
lower than that in the burner, the pumps start up again,
the return mixer opens, and the residual heat from the
boiler is transferred to the buffer.
i
The use of a return booster module is a pre-
requisite for SOLARFOCUS warranty and gua-
rantee claims.
7.2 Boiler connections
Boiler flow, boiler return
Fig. 2-36
1 Boiler flow, G 2“ OT
2 Boiler return, G 2“ OT
Feeler, immersion sleeves
Fig. 2-37: Immersion sleeves on the burner
1 Sensor for thermal overload protection (TOP)
2 Boiler temperature sensor
3 Sensor for overtemperature reset button (STB)
Return flow sensor, pressure transmitter
Fig. 2-38
1 Return sensor
2 Pressure transmitter
3 blank
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Operation manual
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