System-wide functions

A heat meter with pulse output connected at input Vmax (terminal 30) can be used either to limit the system flow rate (parameter code: U) or the system capacity (parameter code: P). The pulse weighting of the heat meter (WMZ) and the type of limitation selected must be entered. The dis- played value corresponds to the unit l/pulse or kWh/pulse.

When the pulse rate reaches the current maximum limit, the flow set point of the control circuit RK1 is reduced. How strongly the controller responds is determined by the Proportional-action coefficient for limitation.

Example to determine the limit value:

If a capacity of 30 kW is to be limited, the following limit value must be set for a heat meter with an output of one pulse per kilowatt-hour:

P =

30 kW

 

= 30 pulse / h

 

1 KWh / pulse

 

Settings for capacity limitation

 

 

 

 

 

 

 

Functions

WE

Configuration

Limitation of heat meter (WMZ)

OFF

Co5 -> Fb08 = OFF

Pulse input for flow rate or capacity limitation

OFF

Co5 -> Fb09 = ON, select: P

 

 

 

 

CONST:

Limitation constant

 

 

 

 

4-Pt:

Limitation acc. to

 

 

10

 

4-point characteristic

 

 

Pulse weighting / 0.1 to 10

 

 

 

Parameters

WE

Parameter level / Range of values

Maximum capacity of the entire system

50 kW

PA5 / 0.1 to 5999 kW

Maximum capacity of the DHW heating

50 kW

PA5 / 0.1 to 5999 kW

Proportional-action coefficient for the limitation

1.0

PA5 / 0.1 to 10

Select CONST additionally for:

 

 

 

 

Maximum capacity of the heating

50 kW

PA5 / 0.1 to 5999 kW

Select 4-Ptadditionally for:

 

 

 

 

Outdoor temperature Point 1

–15 °C

PA5 /–30 to 90 °C

Point 2

– 5 °C

 

 

Point 3

 

5 °C

 

 

Point 4

15 °C

 

 

Maximum capacity limitation, points 1 to 4

50 kW

PA5 / 0.1 to 5999 kW

EB 5179 EN 65

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Image 65
Samson 5179, 5100 operating instructions Settings for capacity limitation, Const

5179, 5100 specifications

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