Spheros thermo 231, Workshop Manual

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Thermo 230 / 231 / 300 / 301 / 350 4 Technical Data
401
4. Technical Data
Where no threshold values are specified technical data
are understood to include standard tolerances for heater
units of ± 10% at ambient temperature of + 20 °C and at
nominal voltage.
Electrical components
Control unit, fan and circulation pump motors, solenoid
valve, igniter box, heater cartridge, nozzle block preheater
and timer are 24V components. Temperature limiter,
flame sensor, temperature sensor and switches are
voltage independent components.
NOTE
The allocation of circulation pumps to heater units must be
in accordance with coolant resistances.
Propellant
The suitable propellant is the Diesel fuel specified by the
vehicle manufacturer.
Only the type of fuel indicated on the identification plate
may be used. Also Diesel fuel with an addition of 5% PME
(vegetable oil methyl ester), class EL fuel oils (not fuel oil
L) or petroleum may be used if their quality is in accordan-
ce with the German standard.
A bad influence caused by additives is not known.
When using fuel out of the vehicle tank the information
about additives of the vehicle manufacturer must be ob-
served.
When using fuel out of a separate fuel tank and at tempe-
ratures below 0°C, winter Diesel fuel must be used.
The use of flow improvers is permitted.
Mixing ratio for separate fuel tank and temperature below
0°C.
Temperature
Winter Diesel
fuel Additive petrole-
um or petrol
0 °C to –20 °C 100 % –
–20 °C to –30 °C 70 % 30 %
or special low temperature
Diesel fuel
–30 °C to –40 °C special low temperature
Diesel fuel or 100 % petroleum