WATTrouter Mx - user manual
How to fit and setup the device
Page 55 from 82
EXAMPLE NO. 2 – 6 LOADS, CONTROL MODE = SUM OF ALL PHASES
The same boiler as specified in example No. 1, swimming pool filtering pump and 6 kW instantaneous water
heating for the swimming pool (pump and three-phase heating element). Recommended peak power output of
the PV-plant is more than 8 kWp.
Boiler heating process has 1st priority (SSR1 No. 1).Requirements are the same as in example No. 1.
Filtering pump has 2nd priority (relay No. 1), nominal motor rating 0.3 kW (value in VA is usually not specified
here), and it must run exactly for 6 hours per day and the minimum switching time is 5 minutes. The daily
amount of required power for this motor is 1.8 kWh. If there is not sufficient amount of sunshine available, the
system will switch back to the low tariff. The motor should not be running at night between 23:00 and 5:00 -
not to disturb people during night (this also depends on the local low tariff time schedule so that the motor can
get a chance to run). If the boiler is large enough and does not often turn off by thermostat, we can set the
“Prepend before SSR” condition to 1 for the filtering pump to make better use of surpluses.
Heating pump has 3rd priority (relay No. 2), power output 0.16 kW and it must run always if the heating
element of the pool heating is on. The typical off delay time for the pump is 1 minute. We only want to turn the
swimming pool heating when there is surplus energy available. Make sure swimming pool heating is fitted with
a thermal protection!
Heating elements are connected to the remaining outputs with lower priorities (SSR outputs).
We recommend using separate contactors for motors, but due to their low power consumption rate it is not
really necessary. WATTrouter device uses low tariff signal and the boiler and swimming pool filtration motors
operate under CombiWATT mode.
