Continuous Flow

Selection of continuous flow can be set by parameter SYS-01. Continuous flow means, that the valve of the leading heat generator will always be open and the pump will stay in operation. The function provides a continuous circulation through the primary heating system, most of the times for adequate temperature measuring or safety requirements. The possible values for SYS-01 and the meaning of them are given in the following table.


Table 11.   Continuous flow mode

SYS-01

Continuous flow mode

0

no continuous flow

1

unconditional continuous flow

2

a) continuous flow for a time defined by SYS-02 hours after the last heat demand occurredor

b) continuous flow if “FilteredOATemp” < 2 °C (fixed, with 1K switching differential), independent of any heat demand


NOTE1: If the boiler with position number “1” is switched off by a “VESFailure”, a “PumpOffAlarm” or one of the inputs “AlarmIn” or “BurnerAlarm” becomes true (=1), or when it is manually switched off by the “ManSwCond” input (ManSwCond = 0), then the “continuous flow” operation will be effective on the next boiler.

The continuous flow mode will be transmitted between the heat generators and heating strategy via a communication signal.


NOTE2: If the leading heat generator setting SYS-07 = 1, which means that the burner, pump and valve outputs will stay on during alarm, the leading heat generator and the continuous flow will not be transmitted to the next heat generator in the sequence.


The continuous flow mode will be transmitted between the heat generators and heating strategy via a communication signal.