External Heat Requirement; Temperature 0; Output 0 - Bosch Control 8313 Service Instructions For Contractors

Settings
Examples of settings to be used when setting the heating system for the
first time are shown below.
• House 1: brick walls with 20 cm thermal insulation
– Building: Heavy
– Insulation standard: Good
• House 2: prefabricated house made of wood frame walls and 20 cm
thermal insulation
– Building: Light
– Insulation standard: Good
• House 3: house made of hollow blocks without thermal insulation
with underfloor heating system
– Building: Medium
– Insulation standard: Good
Example
Set parameters:
Heating Limit
(Summer from / Outdoor Setback)
Building
Insulation standard
Influence of adjusted outside temperature 100 %
Heating circuit is shut down (Heating Limit (Summer from /
Outdoor Setback)) according to adjusted outside temperature:
Measured outside temperature
Adjusted outside temperature (calculated) 17 °C at 13:00 o'clock
Shutdown delay (Heating Limit
(Summer from / Outdoor Setback))
The heating is shut down according to the adjusted outside
temperature:
The heating limit temperature is undercut
Adjusted outside temperature (calculated) 17 °C at 02:00 o'clock
Delay in activation of the heating mode
To achieve a faster changeover response, the Heating Limit
(Summer from / Outdoor Setback), Building and Insulation standard
parameters can be varied.
10.3

External heat requirement

An external heat requirement can be applied at the terminals WA1/2/3
with this function.
Several functions are available for selection:
• Off/On of the heat requirement via the terminals WA1 and 3
– Contacts WA1 and WA3 open = heat requirement Off
– Contacts WA1 and WA3 closed = heat requirement On
When a heat requirement exists, the boiler runs until it reaches
the maximum possible temperature (Maximum shutdown
temperature).
• Temperature-based control or output control via 0...10 V signal via
WA1/2
– Temperature-based control ( Chapter 10.3.1, page 31)
– Output-based control ( Chapter 10.3.2, page 31).
10.3.1 Temperature 0...10 V
If you have selected Temperature for the 0...10 V input, you can adapt
the start and end point, if required, for the external 0...10 V input.
The start value (start-up point) of the curve is set to 0.6 V with a positive
curve ( Fig. 15).
Control 8313 – 6720859567 (2017/03)
17 °C
Medium
Small
17 °C at 10:00 o'clock
3 hours
17 °C at 21:00 o'clock
on the following day
5 hours
Information on the general data main menu
Fig. 15 0...10 V input Temperature
x Input voltage in V (default setting)
y Set boiler water temperature in °C
When programming a curve with a negative slope (e.g. 0 V = 90 °C) make
sure that all 0...10 V inputs of a control unit are connected. An open
input corresponds to 0 V and thus to a heat requirement of e.g. 90 °C.
10.3.2 Output 0...10 V
If Output has been selected for the 0...10 V input, the boiler responds
exclusively to this requirement. This means the control unit will not take
any further requirements into account (e.g. domestic hot water, heating
circuits).
If you selected Output for the 0...10 V input, you can adapt the curve, if
required, to the external output.
The start value (start-up point) of the curve is set to 0.6 V with a positive
curve ( Fig. 16).
Fig. 16 0...10 V input Output
x Input voltage in V (default setting)
y Output demand in %
When programming a curve with a negative slope (e.g. 0 V = 100 %) make
sure that all 0...10 V inputs of a control unit are connected. An open input
corresponds to 0 V and thus to an output demand of e.g. 100 %.
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