ST-707 Rotations Control
II.8.b) Reboiler priority
In this mode, the reboiler pump (HUW) is turned on first, until the set
temperature is reached. After reaching the set reboiler temperature, the
HUW pump shuts down and causes activation of the CH pump. The CH
pump operates constantly, until the moment when the temperature at
the reboiler drops below the set value. At that time, the CH pump shuts
down and the HUW pump is activated
In this mode, operation of the fan and the feeder is limited to 62 degrees
in the boiler, since this prevents the boiler from overheating.
Note:
The boiler should be equipped with return valves on the circuits
of the CH pump and the HUW pump. The valve mounted on the HUW
pump prevents hot water from being sucked out of the reboiler.
II.8.c) Parallel pumps
In this mode, both pumps work simultaneously above the pump
activation threshold temperature (preset to 40
O
C).
The CH pump operates continuously and the HUW pump shuts down after
reaching the temperature set at the reboiler. The HUW pump will be re-
activated when the reboiler temperature drops below the set value (see
HUW hysteresis
in the installer's menu).
NOTE:
In this mode, one should install a three-way valve or another
mixing valve causing maintenance of a different temperature in the
reboiler and of a different in the house.
II.8.d)Summer mode
After activation of this function, only the HUW pump, whose task is
additional heating of the reboiler, operates. This pump is activated above
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