AC•THOR
®
/ AC•THOR
®
9s Operating instructions, version a0020000 15
This mode works in systems where the AC•THOR knows the power in the feed-in point. It
does not work if the power output is given by a higher-level energy management system.
Explanation
In this operating mode the electric immersion heating element of a heat pump is linearly supplied
with excess PV power. This can be equipped with a bimetal thermostat to switch off when the set
temperature is reached. Otherwise the my-PV temperature sensor must be used.
The my-PV temperature sensor must in any event be installed in the hot water tank above the
upper heater to provide a reliable reading!
On exceeding a given excess power threshold, operation of the heating pump will be enabled. This
threshold can be set. Similarly a minimum time for which this threshold must be exceeded. At the
same time as the heat-pump is working, the additional excess power can be passed by the AC•THOR
to the immersion heating element . This is activated in the factory settings.
After the defined excess power threshold has been exceeded for a specified time (t P>), the heat-
pump starts for the minimum operating time (t run). This may also result in power being drawn from
the grid!
When the minimum operating time has expired, the heat-pump remains enabled, provided there is
still excess PV power available and the target temperature at the my-PV temperature sensor is not
yet reached. If this now causes a fall in the excess PV power, the heat-pump will only be disabled
after 60 seconds.
Once the heat-pump is disabled, it will not be reactivated for a period which can be set (t wait).
Optionally, the AC•THOR can also take over guaranteeing the hot water temperature. This is carried
out by enabling the heat-pump, when the immersion heating element will continue to be linearly
supplied with excess.
The target temperature of the heat-pump control is not to be set lower than the AC•THOR
minimum temperature, as this could then no longer be guaranteed!
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