Operation Of The Switch Between Heating And Production Of Domestic Hot Water - DeDietrich MIT-M /E Installation, User And Service Manual

7 Settings
Tab.98 Behaviour of the hydraulic or electrical back-up
Access Parameter
Installation Setup > DHW management
(DP051)
DHW tank >
Parameters, counters,
signals > Parameters
Installation Setup > Delay
StartBackupDHW
(DP090)
DHW tank >
Parameters, counters,
signals > Adv.
Parameters
Fig.53
T
Cp
D
Tp
1
0
B
A Min. CH before DHW (DP048): Minimum heating
duration between two domestic hot water production
runs
B Max. DHW duration (DP047): Maximum authorised
duration for domestic hot water production
C Duration for producing domestic hot water (less than
DP047) to reach the DHW set point
Cp DHW comfort setpoint (DP070): Domestic hot water
"Comfort" set point temperature
78 MIT-M
Operating description
If set to Economy: the system gives priority to the heat
pump during domestic hot water production.
Recourse to the hydraulic or electrical back-up is only
taken if the Delay StartBackupDHW (DP090) time de­
lay has elapsed in domestic hot water mode, unless
hybrid mode is activated. In that case, hybrid logic
takes over.
If set to Comfort: domestic hot water production mode
gives priority to comfort by accelerating domestic hot
water production by simultaneously using the heat
pump and the hydraulic or electrical back-up.
In this mode, there is no maximum time for domestic
hot water production as the use of the back-ups helps
to ensure domestic hot water comfort more quickly.
Delay time for starting the backup energy source for
DHW
7.5.3 Operation of the switch between heating and production
of domestic hot water
The system does not allow the simultaneous production of heating and
domestic hot water.
The switch logic between domestic hot water mode and heating mode
operates as follows:
2 3
A C
4
A
DHW reduced setpoint (DP080): Domestic hot water
"Reduced" set point temperature
T Temperature
Tp DHW tank temp bottom (DM001): Domestic hot
water temperature (lower temperature sensor)
DHW tank temp top (DM006): Domestic hot water
temperature (upper temperature sensor)
t Time
D Hysteresis DHW (DP120): Set point temperature
differential triggering the domestic hot water tank to
be charged
Adjustment required
ECO (Only HP)
Comfort (HP+Boiler)
90
5
t
C
7756241 - v02 - 19062020