Bosch WORCESTER Sense II, Installation Instructions Manual

Page: 40 / 64

40
Service menu
Sense II – 6 720 818 367 (2015/10)
• If the outside temperature exceeds the frost protection
limit temperature by 1 K ( °C) and there is no heat
requirement from the heating system, the heating pump
switches off.
• If the outside temperature drops below the frost protection
limit temperature, the heating pump switches on.
7.1.4 Screed drying menu
A screed drying program is set for the selected heating circuit
or the entire heating system in this menu. To dry a new screed
the heating system automatically runs the screed drying
program once.
In case of a voltage failure the controller automatically
continues with the screed drying program. The voltage failure,
however, may not last longer than the power reserve of the
controller or a maximum duration of an interruption.
This menu is only available if at least one underfloor heating
circuit is installed and set in heating system.
The Room temperature setting does not offer
absolute frost protection, because pipework
installed in poorly insulated outbuildings or
voids, can freeze. This can happen even
though the temperature in the reference room
is considerably above 5 °C . If an outside
temperature sensor is installed, frost
protection can be assured for the entire
heating system regardless of the control type
set:
▶ In the
Frost protect menu, set either
Outdoor temp. or Room and outdoor
temp.
Before using the screed drying program
reduce the DHW temperature at the heat
source to “min”.
NOTICE: Risk of damaging or destroying the
screed!
▶ With multi-circuit systems this function
can be used in combination with a heating
circuit with mixer.
▶ Set the screed drying according to the
manufacturer's instructions.
▶ In spite of the screed drying function,
check the system daily.
Menu item Adjustment range description
Activated Yes The required settings for the screed drying are displayed.
No The screed drying is not active and the settings are not displayed (default
setting).
Dwell time before start No dwell time The screed drying program starts after the set waiting time (selected heating
circuits are switched off during the waiting time, frost protection is active;
default setting: no waiting time,

Fig. 27, time before day 0)
1 ... 50 days
Start phase duration No start phase Time lag between the beginning of the start phase and the next phase
(

Fig. 27, [1])
1 ... 3 ... 30 days
Start phase temperature 20 ... 25 ... 55 °C Flow temperature during the start phase (

Fig. 27, [1])
Heat-up phase step width No heat-up phase Time lag between the steps (step width) in the heat-up phase (

Fig. 27,
[3])
1 ... 10 days
Heat-up phase temp. diff 1 ... 5 ... 35 K Temperature differential between the steps in the heat-up phase (

Fig. 27,
[2])
Holding phase duration 1 ... 7 ... 99 days Time lag between the beginning of the holding phase (duration of the
maximum temperature for screed drying) and the next phase (

Fig. 27,
[4])
Holding phase temp. 20 ... 55 °C Flow temperature during the holding phase (

Fig. 27, [4])
Cool-dn phase step wdth No cool-down phase Time lag between the steps (step width) in the cooling phase (

Fig. 27, [5])
1 ... 10 days
Cool-down phase t.diff 1 ... 5 ... 35 K Temperature differential between the steps in the cooling phase (

Fig. 27,
[6])
Table 23 Setting in the Screed drying menu (Fig. 27 shows the default setting of the screed drying program)