Charging Pump Cycling At Closed Valves

This function can be activated to avoid measuring the buffer supply temperature in standing water.

This function will be acive only for the operation modes 1 and 2. Since in operation modes 5 and 6 we do not need a buffer charging, it does not matter what value the supply temperature sensor measures.

When all the charging valves are closed for a time period longer than PMP-03, the pump will be started for a time as defined by the parameter PMP-02. When any of the charging valve opens the pump will be switched on immediately and run as long as any of the valves is open.

When the parameter PMP-03 is equal to “0”, the pump will not start at closed charging valves. And the cyclic operation will be disabled.

Attention: the first charging valve has to be a changeover valve, otherwise the pump would run against closed valve.

Table 9.   Parameter List

Description

Value Range

Default Value

Unit

PMP-02: pump run time at vlosed valves

0...3600

120

sec

PMP-03: pump restart at closed valves; 0 = disable

0...3600

1800

sec