Pump Management - Carel pRack pR300T Manual Del Usuario

2.5 Pump management

For each heat recovery module, the function can also manage a water circulation pump. This can be
controlled via digital output or 0-10V modulating analogue signal.
Following deactivation of heat recovery, the pump is also stopped, after the set delay.
Pump activation can be based on two mutually exclusive conditions: the heat recovery demand or the
diff erence between heat exchanger water outlet and inlet temperature.
If selecting pump management based on heat recovery demand, the pump will be activated as soon as the
heat recovery demand activation threshold is reached.
The pump will be deactivated, after the set delay, when reaching the heat recovery demand deactivation
threshold.
If on the other hand the pump is set as being activated according to the diff erence between the heat
exchanger water inlet and outlet temperature, the activation percentage will be calculated using PI control,
which compares this diff erence against the set point.
In relation to set point, this type of control is direct: if the diff erence between the water inlet and outlet
temperature is greater than the set point, the pump will be activated.
Screen Eeab09 can be used to specify:
•
whether to enable circulating pump management
•
the type of pump, ON/OFF or modulating
•
the activation delay in seconds
Screen Eeab11 can be used to specify:
•
the activation set point as a diff erence in water temperature
•
the PI control proportional gain
•
the PI control integral time.
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ENG
+030220595 - 1.0 - 27.01.2016