Functions of the DHW circuit

6.3DHW heating with solar system (Anl 2, 3, 4, 5 und 9)

The systems Anl 2, 3, 4, 5 and 9 include a solar system for DHW heating. In these systems, the difference between the temperatures measured at storage sensor SF2 and the sensor at the so- lar collector CF is determined. The Solar pump ON parameter determines the minimum temper- ature difference between sensors SF2 and CF required to activate the solar pump. If the temper- ature difference falls below the value of Solar pump OFF, the solar pump is switched off. Ba- sically, the solar pump is also switched off when the water temperature measured at sensor SF2 has reached the Solar charging OFF parameter.

The times-of-use of the DHW circuit do not have any influence on the operation of the solar sys- tem. After the key number 1990 has been set, the operating hours of the solar pump are dis- played in extended operating level.

Function

WE

Configuration

Storage tank sensor SF2

 

 

FB15 = ON, select “CF“

 

 

 

Parameters

WE

Range of values

Solar circuit pump ON

10

°C

0 to 30

°C

Solar circuit pump OFF

2

°C

0 to 30

°C

Solar charging OFF

70

°C

20 to 90

°C

 

 

 

 

 

6.4DHW heating in instantaneous heating system (Anl 6)

The controller regulates the DHW outlet temperature of the heat exchanger according to the ad- justed DHW temperature.

The circulation pump works according to the time schedule. We strongly recommend to operate the circulation pump during times-of-use of the DHW circuit (–> section 6.5).

To keep temperature peaks caused by load changes as small as possible, it is absolutely neces- sary that a temperature sensor with short response times (e.g. Type 5207-xx6x Pt 1000 Sen- sor) to measure the DHW outlet temperature. In addition, an actuator with a transit time of around 20 seconds should be used.

Note!

The control parameter setting has great influence on the control accuracy in the case of DHW heating in instantaneous heating systems.

Parameter

WE

Range of values

DHW temperature

55 °C

20 to 90 °C

EB 5476 EN 53

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Image 53
Samson 5476 manual DHW heating with solar system Anl 2, 3, 4, 5 und, DHW heating in instantaneous heating system Anl

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