Refill Valve Control

The secondary minimum pressure switch generates a non-critical alarm and opens the refill valve. If the secondary minimum pressure switch alarm returns to normal in the time defined by the parameter "maximum refill valve runtime", the refill valve will be closed 30 s after the pressure returns to normal.

If the secondary minimum pressure switch alarm does not return to normal in the defined time, the refill valve will be closed, the operation mode will display the value "13" (maximum refill time exceeded) and the heat exchanger will be stopped (heat exchanger valve closes and primary pump stops).

Table 12.   Parameter List

Description

Value Range

Default Value

Unit

REF-01: maximum refill valve runtime

0...600

120

sec