Bosch BSS250E-2 Installation And User Manual page 34

· Sensor diagnostics: The SolaStat-Eco constantly checks the sensors. If the roof sensor is
above 140°C, the pump is disabled. If a sensor is outside the specified temperature range of -
40°C to 150°C then the display flashes the „Topout‟ light for the Roof sensor and flashes the
„Frost‟ light for the Inlet sensor and the controller enters Smart Shutdown mode. The sensor
has either a slowly flashing light for a temperature above 150°C (possibly shorted sensor or
wire) or a fast flashing light for a temperature below -40°C (possibly open sensor or broken
wire). For example if the „Roof‟ sensor wire is cut during some building work then the SolaStat-
Eco „Topout‟ light flashes fast and the controller enters Smart Shutdown mode until the wire is
repaired.
· Smart Shutdown (SSd): In Smart Shutdown mode, the „Topout‟ and or „Frost‟ light is
flashing and the pump is disabled except for „Frost‟ protection when the Roof sensor is
working.
· The „PWR‟ light on indicates that power is being applied to the unit.
· The „PUMP‟ light will be on when the pump is on. The exception to this is, if the Pump Timer
is on a one minute recovery cycle, the light will be on but the pump will not be running during
that minute. (see „Pump Timer‟ explanation on previous page).
· „TOPOUT‟ light on indicates the value stored as the maximum allowable hot water tank
temperature has been reached. If lit the pump will be disabled until the temperature drops at
least 2°C lower.
· The „FROST‟ light comes on when the value stored for the onset of a frost condition has
been detected on the solar collector. To stop the collector freezing and bursting, the pump will
come on just enough to raise the temperature of the collector by 2°C. Only a small amount of
warm water is needed to protect the collector.
The „PUMP‟ button will turn the pump on as long as the button is held down, unless of course
the pump is already on in normal operation.
The 'TEST' button will check the system during which all the lights should flash on.
Pressing Button „F2‟ flashes the Topout light and pressing Button „F3‟ flashes the Frost light
but these buttons have no effect on unit operation.
Pump override: For added flexibility you can make the pump operate manually. The pump will
turn on as long as the „Pump‟ button is held down unless of course the pump is already on in
normal operation.
Test: Briefly pressing this button will cause all the lights to flash for 3 seconds.
Display panel description.
SolaStat-Eco Safety Instructions.
Read safety instructions and limit of liability before proceeding with the installation.
General Safety Instructions.
1. This installation guide is for the installation of SolaStat-Eco solar hot water controllers only
and is not an installation guide for any other part.
2. The complete installation should be checked at least annually for damage or malfunction.
3. All servicing to be carried out by an authorised service agent only.
4. All aspects of the installation must comply with local electrical and plumbing regulations
(and any special solar hot water regulations).
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