STIEBEL ELTRON SOL 25 PLUS - Manual (Page 4)

4 | SOL 25 PLUS WWW.STIEBEL-ELTRON-USA.COM
WARNING: NEITHER DROP THE COLLECTOR NOR ANYTHING ONTO
THE COLLECTOR.
NEVER STEP ONTO OR STAND ON THE COLLECTOR.
NEVER LEAVE THE COLLECTOR UNSUPPORTED OR UNSECURED. THE
GLASS COULD BREAk IF THE COLLECTOR FALLS OVER CAUSING SERIOUS
INJURY OR DEATH.
WARNING: SETTING THE MAxIMUM TANk TEMPERATURE HIGHER
THAN 140°F AT THE CONTROL UNIT IS PERMISSIBLE ONLY IN
CONJUNCTION WITH A THERMOSTATICALLY-CONTROLLED DHW MIxING
VALVE. OTHERWISE THERE CAN BE A RISk OF SCALDING AT THE DRAWOFF
POINT.
IMPORTANT: ALL SENSOR WIRING SHOULD BE RATED FOR
ExPECTED TEMPERATURES AND MUST BE PROTECTED FROM
DEGRADATION AND ELECTRICAL INTERFERENCE.
Solar Loop
Use only a mixture of 50% GRAS (food grade) Propylene Glycol and
de-ionized water. (Heat Exchanger type SW, AWWA Fluid Class II -
see MSDS for handling instructions.)
WARNING: FLUID MAY BE DISCHARGED AT HIGH TEMPERATURE
AND/OR PRESSURE.
NO OTHER FLUID SHALL BE USED THAT WOULD CHANGE THE ORIGINAL
CLASSIFICATION OF THIS SYSTEM. UNAUTHORIZED ALTERATIONS TO THIS
SYSTEM COULD RESULT IN A HAZARDOUS CONDITION.
Shut-Down
Use only a mixture of 50% GRAS (food grade) Propylene Glycol and
de-ionized water. (Heat Exchanger type SW, AWWA Fluid Class II -
see MSDS for handling instructions.)
Except for repair and/or emergency, the control unit and the pump
must remain powered and activated in order to avoid overheating
the collectors. Prior to shutting down the system for repairs, cover
the solar collectors or work at night.
If EMERGENCY SHUT-DOWN is needed, the system should be placed
in manual operating mode (set HND: OFF - see SOM controller
manual), then call for service. There are three isolation valves on
the Flowstar pump unit (see Flowstar manual).
3.1 Equipment Description
The SOL 25 Plus flat-plate collector converts sunlight
(radiation) into heat. Light penetrates the glass cover, which is
pre-stressed, highly transparent single pane safety glass. As the
light strikes the absorber plate, it is converted into heat. The highly
selective vacuum coating of the absorber and the thermal insulation
on the back of the absorber reduce heat losses to the environment to
a minimum.
The thermal energy produced by the collector is transported by the
heat transfer medium (solar loop fluid), via a circulating pump, to
the storage tank(s). The inside of the collector can mist up under
certain operating conditions (e.g., large tank with low temperature
compared to the outdoor temperature and/or high relative
humidity). Vent holes are provided in the collectors for venting
humidity and equalizing air pressure.
3.2 Important Information
WARNING: RISk OF SCALDING. TO PREVENT THE SOLAR FLUID
FROM BOILING IN THE COLLECTORS, THE SYSTEM SHOULD NOT BE
FLUSHED OR FILLED DURING PERIODS OF STRONG SUNSHINE.
System Pressure
Regularly check the pressure gauge of the heat transfer circuit at the
SE Flowstar pump station; it should indicate 50 psi when the system
is cold (below 86°F).
A 2-tank system should include bypass valves to bypass the solar
storage tanks. All valves should be labeled with operating position
indicated.
After-heating Backup
The backup heater should be of adequate capacity to provide suf-
ficient hot water. The backup water heater must be certified, listed,
and labeled by an accredited safety certification organization.
Expansion Tank
The standard, 1.5-gallon expansion tank for the solar loop is sized
for up to 10 gallons of total system fluid volume and up to 60 feet in
overall system height.
2. SAFETY INSTRUCTIONS (CONT.) 3. ASSEMBLY INSTRUCTIONS
FOR ThE PROFESSIONAL