Spheros Thermo S 160, Workshop Manual

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3 Assemblies and components Thermo S 160/230/300/350/400
308
3.4.2 Aquavent 6000C (U4855) and Aquavent
6000SC (U4856) circulating pumps
The Aquavent 6000C (U4855) and
Aquavent 6000SC (U4856) circulating pumps are
equipped with a brushless motor.
The Aquavent 6000C (U4855) has a floating-ring type
shaft seal.
The Aquavent 6000SC (U4856) is equipped wit a
magnetic coupling (no seal)
Soft start
The circulating pump motor starts slowly and gently. Max.
rotational speed is only reached after approx. 5 seconds.
Protection against dry running
Protection against dry running is integrated into the
circulating pump motor.
If the circulating pump motor consumes within a time
period of approx. 45 minutes significantly less current, dry
running is detected. The circulating pump motor is
switched off.
After approx. 2 minutes and circulating pump motor
reactivation, the operation can be continued.
Blocking protection
If the pump wheel is blocked, the motor will be switched
off via the error mode directly prior to standstill of the
pump wheel.
Overload protection
Overload protection is activa ted after the soft start is
completed. The current consumption will be limited.
In case of hydraulic overpressuring of the circulating
pump, the circulating pump motor will not be damaged.
Error mode
In case of malfunctions the circulating pump motor is
switched off via the error mode. After approx. 5 seconds
the error mode switches the circulating pump motor into
energy-saving sleep mode.
Sleep mode
In sleep mode internal electronics consumers of the
circulating pump motor are switched off.
Reactivation of the circulating pump motor
It is possible to reactivate the circulating pump motor from
sleep mode. For this purpose the power supply is
disconnected for > 2 min. Af ter the power supply is
reconnected, the circulating pump motor restarts in soft-
start mode.
Inverse-polarity protection
The circulating pump motor is not equipped with an
internal inverse-polarity protection.
3.5 Fuel filter
A heatable fuel filter is available as an option. The
temperature switch switches the integrated filter heating
on at a temperature of < 0.5 ± 2.5 °C and switches it off at
a temperature of < 5.5 ± 2.5 °C. NOTE