Siemens AVS75.39 Series User Manual page 158

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Siemens
Building Technologies
Cons circuit pump VK1 Q15
Consumer circuit pump 1 can be used for an additional consumer. Together with
the respective external request for heat/cooling energy at input Hx, the application
is suited for an air heating coil/air cooling coil, for instance.
Boiler pump Q1
The connected pump is used for circulating the boiler water.
Bypass pump Q12
The connected pump serves as a boiler bypass pump for maintaining the boiler
return temperature.
Alarm output K10
If a fault occurs in the controller or the system, one of the alarm relays delivers a
signal.
When the fault is corrected, that is, when the fault status is no longer present, the
relay is immediately deenergized.
If the fault cannot immediately be corrected, it is still possible to reset the alarm
relay. This occurs on operating line 6710.
2nd pump speed HC1 Q21 /HC2 Q22/HC3 Q23
This function facilitates control of a 2-speed heating circuit pump, allowing the
pump's capacity to be lowered in Reduced mode (e.g. during night setback). In that
case, multifunctional relay QX is used to activate the 2nd pump speed in the
following manner:
1st stage
Output Q2/Q6/Q20
Off
On
On
Heat circuit pump HC3 Q20
The relay is used for the control of heating circuit pump 3 at Q20.
Cons circuit pump VK2 Q18
Consumer circuit pump 2 can be used for an additional consumer.
Together with the respective external request for heat/cooling energy at input Hx,
the application is suited for an air heating coil/air cooling coil, for instance.
System pump Q14
The connected pump serves as a system pump for supplying heat to other
consumers.
The system pump is put into operation when one of consumers calls for heat. If
there is no heat request, the pump is deactivated followed by overrun.
Heat gen shutoff valve Y4
If the buffer storage tank holds a sufficient amount of heat, the consumers can
draw their heat from it, and the heat sources need not be put into operation.
Automatic generation lock locks the generators and hydraulically disconnects them
from the rest of the plant with the help of a diverting valve Y4.
This means that the heat consumers draw the energy they require from the buffer
storage tank and wrong circulation through the generators is prevented.
Solid fuel boiler pump Q10
User manual RVS43.345
The settings in detail
Stage 2
Output Q21/Q22/Q23
Off
Off
On
Pump state
Off
Part load
Full load
CE1U2354en_021
2013-09-02