M thermal Mono
202005 87
Part 3 - Installation and Field Settings
until at least t_INTERVAL_DHW minutes have elapsed.
dT5_TBH_OFF sets the temperature difference between the DHW set temperature (T5S) and the DHW tank water
temperature (T5) below which the immersion is not used. When T5 > Min(T5S+dT5_TBH_OFF, 65°C), the immersion
heater is off.
T4_TBH_ON sets the ambient temperature above which the immersion heater will not be used.
t_TBH_DELAY sets the delay between the compressor starting and the immersion heater being turned on.
T5S_DI sets the DHW tank disinfection operation target temperature. Caution: during the disinfection operation (duration:
t_DI_MAX) the domestic hot water temperature at the hot water taps will at times be equal to the value set for T5S_DI.
t_DI_HIGHTEMP sets that length of time that the DHW tank disinfection operation
target temperature is maintained.
t_DI_MAX sets the total duration of the DHW tank disinfect operation.
t_DHWHP_RESTRICT sets the maximum length of time that the heat pump will
run in space heating or space cooling modes before switching to DHW mode, if a
requirement for DHW mode exists. When running in space heating mode or space
cooling mode, the heat pump becomes available for DHW mode either as soon as
the space heating/cooling set temperatures have been reached (refer to Part 3, 7.5 “COOL MODE SETTING Menu” and Part
3, 7.6 “HEAT MODE SETTING Menu”) or after t_DHWHP_MAX minutes have elapsed.
t_DHWHP_MAX sets the maximum length of time that the heat pump will run in DWH mode before switching to space
heating mode or space cooling mode if a requirement for space heating/cooling modes exists. When running in DHW
mode, the heat pump becomes available for space heating/cooling either as soon as the DHW tank water temperature (T5)
reaches the DHW set temperature (T5S) or after t_DHWHP_MAX minutes have elapsed.
Figure 3-7.9 illustrates the effects of t_DHWHP_MAX and t_DHWHP_RESTRICT when DHW PRIORITY is enabled. The heat
pump initially runs in DWH mode. After t_DHWHP_MAX minutes, T5 has not reached
Figure 3-7.9: Operation in DHW PRIORITY
Abbreviations:
T5: DHW tank water temperature
T5S: DHW set temperature
T5stop: DHW mode leaving water temperature operating limit
DHWPUMP TIME RUN sets whether or not the user is able to set the DHW pump (field supply) in DHW mode. For
installations with a DHW pump, select ON so that the user is able to set pump start times.
PUMP RUNNING TIME sets the length of time the pump runs for at each of the user-specified start times on the DHW
Figure 3-7.8: DHW tank disinfection
Abbreviations:
T5: DHW tank water temperature
T5S: DHW set temperature
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