Hydraulic System With Butterfly Valve; Gateway Function (Implementation Of 0-10 V Signal On Ems 2/Ems Plus); Setting The Coding Switch; Supplied Parts - Bosch MC 400 Manual De Instalación Para El Técnico

The temperature sensor must be positioned so the measurement is
taken centrally in the pipe.
▶ Use tap extensions to adjust the installation depth of the low loss
header temperature sensor ( Installation instructions of low loss
header sensor set). If installed correctly, the sensor projects 1-2 cm
into the heat exchanger.
2.3.9

Hydraulic system with butterfly valve

Instead of a hydraulic system with a low loss header, a hydraulic system
with a shut-off of the heat source by butterfly valve can be installed for
floor standing boilers. Here the temperature sensor (T0) must be
attached to the common flow to the heating circuit (downstream the
connection point of the devices) ( Fig. 88 at the end of the
document). The butterfly valve of the guiding device remains
permanently open as long as there is a system heat demand.
For this purpose, the parameterisation must be adapted: In Service
menu> System data> call up Low loss hdr. sensor instll. and select
Setting No: No low-loss header.
2.3.10 Gateway function (implementation of 0-10 V signal on
EMS 2/EMS plus)
This control strategy is used, if the heating system is controlled using a
building management system with a 0-10 V control output, and the set
temperature should be sent directly (without internal control) to the
connected devices.
As with the flow temperature control, the set flow temperature is
determined by evaluating the 0-10 V interface ( Chapter 2.3.6,
page 16). This set temperature is transmitted to all connected heat
sources via the Bus interfaces (BUS1...BUS4). There can be between
1 and 16 heat sources used.
Each heat source operates autonomously and is controlled
independently based on the specified set temperature, or it follows its
own higher prioritised settings (e.g., DHW mode, start-up behaviour,
cycling behaviour etc.).
The pump flow ( Chapter 2.3.7, page 16) is switched off, when the
Gateway function is activated.
2.4

Setting the coding switch

Depending on the coding switch setting, the control variable is either the
total output of the system or the temperature, which is measured by the
flow temperature sensor T0 at the low loss header. In order to achieve a
stable control of the system, the manipulated variable of the system with
internal control is always the performance of the individual heat sources.
The control variable is set via the performance of the individual heat
sources. The set flow temperatures at the heat sources are set to
maximum.
MC 400 – 6720890243 (2018/12)
Coding switch with On/Off indicator of the module and a status display
of the connected heat sources or modules:
Fig. 11 Coding switch with module status display, and a status display
of the connected heat sources or modules
Coding Function of module
0 Off (delivered condition)
1 Serial standard cascade
2 Serial optimised cascade ( Fig. 83 at the end of the document)
3 Serial cascade with peak load coverage
4 Parallel cascade
5 Gateway function ( Chapter 2.3.10, page 17)
External 0-10 V specified set flow temperature without internal
control
6 External 0-10 V performance control with serial standard
cascade (no internal temperature control)
7 External 0-10 V performance control with serial optimised
cascade( Fig. 84 at the end of the document, no internal
temperature control)
8 External 0-10 V flow temperature control with serial standard
cascade
9 External 0-10 V flow temperature control with serial optimised
cascade
10 The module is one of a maximum of 4 lower level cascade
modules. The higher level cascade module controls the
connected heat sources corresponding to the code noted on
them ( Fig. 85 at the end of the document).
Table 2 Coding and function
2.5

Supplied parts

Fig. 64 at end of document:
[1] Module
[2] Bag with strain relief
[3] Installation manual
2.6

Specification

This product conforms to European directives and
supplementary national requirements in design and
operation. Compliance is demonstrated by the CE marking.
You can request the conformity declaration of the product. If you require
this, contact the address on the back cover of these instructions.
Specification
Dimensions (W × H × D)
Maximum conductor cross-section
• 230 V terminal
• Extra-low voltage terminal
Rated voltages
• BUS
• Module mains voltage
• User interface
• Pumps and mixers
Product Information
4
3
2
1 S
0 Y
I
0 010 013 229-001
246 × 184 × 61 mm (for more
dimensions  Fig. 65 at the end of
this document)
2
• 2.5 mm
2
• 1.5 mm
• 15 V DC (reverse polarity
protected)
• 230 V AC, 50 Hz
• 15 V DC (reverse polarity
protected)
• 230 V AC, 50 Hz
17