One Shot Boost And Auto Boost At Negative Temperatures - Bosch Compress 3000 DW FOO Installation Instructions Manual

5.10 One shot boost and auto boost at negative
temperatures
In order to guarantee faster recovering times when the air
temperature is low and the thermal power of the heat pump
cycle decreases, the appliance is equipped with two boost
functions:
• auto-boost
• one shot boost
The appliance efficiency decreases when
boost is active, as part of the heating is
ensured by the backup electric heater. For
this reason, the auto boost is limited to very
low air temperatures and the one shot boost
is recommended to be used only when large
loads of hot water were drawn and a faster
recovering time is required to fulfill the next
hot water needs.
Note that, between 0 °C and 15 °C air
temperature when the boost is active the
heat pump cycle ensures only 1/3 to 1/2 of
the heating.
For higher air ambient temperatures the
fraction of the heating ensured by the heat
pump cycle increases due to the higher
thermal power.
Auto-boost function
The auto-boost function switches on the electric heater
together with the heat pump cycle when the air temperatures
drops below 0 °C.
As soon as the air temperature rises above 0 °C the electric
element is switched off and the heating is ensured by the heat
pump cycle alone.
Below 0 °C air temperature, when the auto-boost is on,
typically only one third of the heating is provided by the heat
pump cycle.
The auto-boost is switched on as well, when the LEG
disinfection is not finalized in 24h.
One shot boost function
The one shot boost needs to be manually activated and is
automatically deactivated once the water reaches the set
point.
Activation and deactivation of the one shot boost function
▶ Press and hold the "+" and "-" buttons together for more
than 3 seconds to activate or deactivate the one shot
boost.
When the auto-boost function or the one shot boost function is
active, "FULL" is displayed on the HMI, alternating with the to
tank temperature.
Compress 3000 DW FOO
Appliance status information | 35
Fig. 47 Auto-boost or one shot boost active
When the boost was activated automatically
(air temperature below 0 °C, activated by
PLUS function, LEG cycle running for more
than 24h) it can not be manually deactivated.
6720646160-08.1V
6 720 808 869 (2014/06)