Thermo E 200 / 320 3 Description of assemblies and components
307
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.
HINWEIS
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 circu-
lating 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 reac-
tivation, 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 activated 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 circu-
lating 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 discon-
nected for > 2 min. After the power supply is reconnected,
the circulating pump motor restarts in soft-start mode.
Inverse-polarity protection
ATTENTION
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 integrated filter heating is switched on below of a fuel
temperature of 0.5°C and off at a temperature of 5.5°C.
When the heater is operated at temperatures below of
-30°C the usage of this heatable fuel filter is absolutely
necessary.
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