Setting The Hold Time; Setting The Setback Temperature; Setting The Setback Time; Dhw Data - Bosch CFB 840 Servicing Instructions

10.25.4 Setting the hold time

This setting determines the holding period of the maximum temperature
for screed drying.
B Turn the rotary dial until submenu Screed drying Hold max temp
appears.
B Hold down button Display and turn the rotary dial until the required
value is shown.
HEAT CIRC. DATA
Screed drying
Hold max temp
Fig. 55 Setting the hold time
B Release Display to save your input.
Input range
Hold max temp 0 days – 20 days
Table 69 Setting range Hold max temp

10.25.5 Setting the setback temperature

This option determines the steps in which the temperature should
decrease to dry out the screed.
B Turn the rotary dial until submenu Screed drying Setback by
appears.
B Hold down button Display and turn the rotary dial until the required
value is shown.
HEAT CIRC. DATA
Screed drying
T. setback by
Fig. 56 Setting the setback temperature
B Release Display to save your input.
Input range
T. setback by 1 K – 10 K
Table 70 Setting range Setback by

10.25.6 Setting the setback time

This option determines in which daily cycle the temperature should fall
to dry out the screed.
B Turn the rotary dial until submenu Screed drying Setback appears.
CFB 840
2
20 Days
6 720 802 836-69.1TL
Factory setting
4 days
2
10K
6 720 802 836-70.1TL
Factory setting
5 K
B Hold down button Display and turn the rotary dial until the required
value is shown.
HEAT CIRC. DATA
Screed drying
Setback
Fig. 57 Setting the setback time
B Release Display to save your input.
B Press Back to return to the next higher level.
With setting none the screed drying function terminates
at the end of the maximum hold period.
Input range
Setback in none
daily cycles every day – every 5th day
Table 71 Setting range Setback in daily cycles
11

DHW data

The function DHW is part of the standard equipment level of this control
unit.

11.1 Select Domestic hot water

B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu DHW (Domestic hot water)
appears.
B Press Display to call up a submenu.
DHW appears as the first main menu.
B Hold down button Display and turn the rotary dial until the required
value is shown.
B Release Display to save your input.
B Press Back to return to the next higher level.
Input range
DHW yes
no
Table 72 Setting range Domestic hot water

11.2 Setting the temperature range

This function determines the upper limit for the set DHW temperature.
WARNING: Risk of scalding through hot water.
Setting the temperature above 60 °C creates a risk of
scalding.
B Do not draw off DHW unmixed.
B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu DHW appears.
B Press Display to call up a submenu.
DHW data | 35
2
every 5th day
6 720 802 836-71.1TL
Factory setting
every day
Factory setting
yes
6 720 802 836 (2012/05)