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4.19 Circulation pump (SICASYM)
The circulation pump is driven by a single-phase a.c. motor.
The switching of the two motor windings with the motor capacitor is
actuated either via electronics or a relay on the motor connection
c
or
via the module
d
. In the start phase the two windings (one in series
with the capacitor) are connected in parallel to each other and directly
to the mains voltage and generate a very high starting torque. After
the switchover phase, the windings are then in series (one behind the
other), i.e. each winding is connected to half the mains voltage. The
motor is then adjusted optimally to the (operating) pump and gene-
rates very little noise apart from a very low power consumption – for
label AAA –, as the windings are connected to half the mains voltage
during operation. The motor features a thermal winding cover (bi-
metal) to prevent overheating.
Operation:
Start:
Technical specifications:
Designation Value
Unit
Nominal voltage
230–240
V
Frequency 50
Hz
Resistor
Ha approx. 44–57
HI approx. 50–55
Ω
Ω
Delivery height
3.9–4.1
m
Delivery capacity
25–30
l/min
Starting current
2.4
A
Operating current
0.31
A
