Stober ME 200, Manual

Page: 31 / 124

Product Information
ME 200 – 6721841615 (2021/11) 31
2 Product Information
The module ME 200 allows an alternative heat source to be connected to
a EMS 2control system. An alternative heat source might be a wood
stove with water routing or biomass boiler.
• The purpose of the module is to connect an alternative heat source
system with buffer cylinder to a EMS 2 control system. As an option,
the alternative heat source can also be controlled.
• The purpose of the module is to automatically block/release a
conventional EMS 2 heat source depending on the buffer filling level
and current heat energy demand.
• The purpose of the module is to control the charging and discharging
of the buffer cylinder with corresponding pump assembly and 3-way
valve (buffer bypass circuit) or mixing valve (Premix control).
• The purpose of the module is to record the buffer cylinder
temperature (upper, centre, lower), system flow temperature after
buffering, outside temperature and flow, flue gas, return
temperatures of the alternative heat source.
• The module can be used with a conventional heat source as stand-
alone (without BUS connection to a conventional heat source) or with
integrated system (via EMS 2 control system). The function of the
module AM200 is determined via the code switch (

Chapter 2.4,
page 32).
The combination options for the modules are shown in the connection
diagrams.
2.1 System requirements
• The module can be used as stand-alone (without BUS connection to
a conventional heat source). A system control unit CR 400/CW 400/
CW 800 is required for this purpose.
• For the module to communicate via the BUS interface EMS 2 (Energy
Management System), the following control unit must be
incorporated into the system:
– CR 400/CW 400/CW 800 from software version NF18.04
– when using in an integrated system with a conventional heat
source: CR 400/CW 400/CW 800 or UI 800
– Communication via the operating unit for heat pumps is not
possible.
• The ME 200 module provides the option of blocking the conventional
heat source if there is sufficient heat in the buffer cylinder. For
blocking, there are two options:
– blocking via EMS 2 (for automatically recognised supported
control units)
– blocking via the connecting terminal OEV with switching contact
(not for control units not supported)
• When blocking the conventional heat source via BUS interface
EMS 2 , the connecting terminal OEV of the ME 200 is not used.
Blocking via the BUS interface is currently only supported when using
the following control unit series:
– MX 25 from V1.44 (> 04/2018)
– ACU M/Hx (GC9800iW, GC7800iW, GC5x00iW, ...)
• For the blocking to take place via the OEV connecting terminal, the
heating and DHW mode in combination with gas wall-mounted indoor
unit must be supplied via the buffer cylinder. A separate heating
circuit module MM 100 (address 9) is required for the charging of the
buffer cylinder. In this case, hydraulic configurations in which DHW is
charged directly by the gas wall-mounted indoor unit (without buffer
storage cylinder) cannot be implemented with blocking function.
• For wall mounted conventional heat sources with C 400/C 800
system control unit, a separate cylinder primary pump for supplying
one or more heating circuit modules MM 100 (address 9 or 10) is
required to control the DHW function. This is not necessary for gas
wall-mounted indoor unit with system control unit UI 800.
• To charge the buffer cylinder via the ME 200, the alternative heat
source must be water routing and must allow installation of a flow
temperature sensor. If the flow temperature sensor does not become
warm when the pump is not running, a flue gas temperature sensor is
also required.
• To control the alternative heat source, it must have a suitable
connection (volt free contact for On/Off signal and an optional
0-10 V interface).
If, for example, a manually operated pellet stove should remain in the
living space (without ME 200 switching command), this must be
operated via the appliance-internal electronics of the pellet stove.
• An alternative heat source with return temperature increase via
electrical mixer requires a return temperature sensor downstream of
the mixer.
• To ensure an efficient function of the heating system, use a type B...-
6 buffer cylinder or newer.
2.2 Important notices on use
The module communicates via an EMS 2 interface with other EMS 2-
enabled BUS nodes.
• When using an alternative heat source, each heating circuit must be
equipped with a mixer. If only one heating circuit exists, an internal
temperature control can be used instead of the mixer.
• If the alternative heat source only heats the DHW, and a gas wall-
mounted indoor unit with CR 400/CW 400/CW 800 source heats the
heating water, the conventional heat source cannot be connected to
the terminal OEV of the ME 200.
• Important: in systems with heat pump, the ME 200 must not be
connected with the EMS BUS of the heat pump, it should be
connected as follows:
– In dual-fuel systems comprising conventional heat source and heat
pump: connect to EMS 2 BUS of the conventional heat source.
– Otherwise: operate module ME 200 as stand-alone.
– In district heating systems (

Fig. 28), the control of return
operating conditions is not possible.
• The installation room must be appropriate for the IP rating stated in
the technical data of the module.
• If a DHW cylinder is connected:
– Thermal disinfection cannot be guaranteed with stand-alone
alternative heat sources.
– The conventional heat source controls the DHW, including
thermal disinfection, directly.
– Thermal disinfection may have to be monitored manually.
Observe the heat source instructions.
• If the alternative heat source is charging the DHW cylinder and the
ME 200 is actively controlling the alternative heat source, the set
temperature should as far as possible match the set flow temperature
of the alternative heat source when charging the DHW cylinder.
– CW 400/CW 800

DHW settings > ... > Flow temp. increase
• If external DHW is installed downstream of the low loss header, care
must be taken to ensure that the Start cyl. primary pump
adjustment in the CW 400/CW 800 are set to Immed. . If the sensor
TB4 is installed on buffer cylinder, as an alternative, the setting Start
cyl. primary pump can also be set to Temp.-dependent .