Menu structure
27
Control 8313 – 6720859567 (2017/03)
9.5 Domestic hot water
WARNING:
Risk of scalding from hot water!
Setting the set temperature > 60 °C creates a risk of scalding.
▶ Do not draw off DHW unmixed.
The Domestic hot water function is described below.
▶ If DHW is heated with a different function module, take the
instructions for the function module used into consideration.
Table 18 Basic setting
Table 19 DHW settings
Submenu Settings/Setting range Explanation Note
Basic setting Domestic hot water 1 Setting that determines whether the DHW
is to be heated via the central module of
the control unit and, if so, how.
None No DHW heating available
ZM The DHW is heated via the control unit. Depends on the installed heat source
Chapter 13, page 36
EMS The DHW is heated via the EMS heat
source.
Attention:
When EMS is selected, only one DHW
heating is possible. With EMS, the DHW is
heated via the EMS heat source with three-
way valve. Connect the DHW temperature
sensor to the heat source.
If the EMS heat source does not have a
three-way valve, domestic hot water must
be adjusted via ZM and the hot water
temperature sensor must be connected to
the control unit.
Domestic hot water 2 Off/On Setting that specifies whether a second
DHW function is available.
Submenu Settings/Setting
range
Explanation Note
Domestic hot water Off/On Switching the DHW heating on or off
Range 60...90 °C Determining the upper limit for the set
temperature of the DHW
Hysteresis (Hysteresis) -2...–5...-20 K Setting of the point in Kelvin (K) below the set
DHW temperature at which reheating of the
cylinder begins
Boiler temperature increase
at low loss header
0...20 ...40 K The flow temperature of the DHW heating is
obtained by adding the increase in boiler
water temperature to the required DHW
temperature.
The default setting (1 K equals 1 °C) is the
most suitable for rapid DHW heating.
Pump overrun time 0...3...60 min Setting that determines how many minutes a
pump should remain switched on once the
switch-on condition no longer exists.
External fault display None An external zero-volt fault display contact of a
cylinder primary pump or a external current
anode can be connected to terminals WF1
and WF2 of the FM-MW/ module.
Not available with the connections of the
boiler circuit.
• Contacts WF1 and WF2 closed = no fault
• Contacts WF1 and WF2 open = fault
Pump
External current
anodeExternal current
anode
External contact None Setting that determines which function is
executed when the external contact is
actuated.
Terminals WF1 and WF3
Not available with the connections of the
boiler circuit.
Thermal disinfection
Once-only cylinder
charging
Thermal disinfection Off/On Further settings required
( Chapter 9.5.1, page 28)!
Circulation Off/On DHW is immediately available at the draw-off
points.
Further settings required
( operating instructions)!
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