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12
Special parameter
This parameter enables Bosch service engineers to optimise the system
beyond the standard parameters by fine-tuning the sub-parameters.
This level is reserved for Bosch service engineers. Therefore, settings
are not made in plain text but in code. These are explained in a separate
document.
13
Heating curve
With menu Heating curves the current heating curves of all heating
circuits can be displayed.
The flow temperatures (VL), which depend on the outside temperature
(AT), are displayed.
B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu HEATING CURVE appears.
B Press Display to call up a submenu.
B Turn the rotary dial to display the heating curves of all heating circuits.
HEATING CURVE
Heating circ. 2
OT: 10 / 0 / -10
VL: 45 / 62 / 75
Fig. 72 Heating curve
B Press Back to return to the next higher level.
14
Relay test
Menu Relay test provides a check whether the external components
(e.g. pumps) are working correctly.
The display depends on which modules are installed. Depending on the
current operating conditions, there may be a time delay between
demand and display.
CAUTION: System damage through disabled functions!
The supply of heat to the heating system is not
guaranteed during the relay test. The control system
disables all functions.
B Function Relay test must be stopped at the end of the
test to prevent damage to the system.
CFB 840
With the modules used most commonly in the control units, the following
relays can be called up:
• Boiler
– Burner
– Actuator
– Boiler pump (if enabled)
• Heating circuit 0 – 4
– Circulation pump
– Actuator (not on heating circuit 0)
• Domestic hot water
– Cylinder primary pump
– DHW circulation pump
Relay test example
B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu Relay test appears.
B Press Display to call up a submenu.
B Turn the rotary dial until submenu Heating circ. 2 appears.
B Press Display to call up a submenu.
B Turn the rotary dial until submenu Actuator appears.
B Hold down button Display and turn the rotary dial until the required
value is shown.
RELAY TEST 2
Heating circ. 2
Actuator
6 720 802 836-93.1TL
Fig. 73 Relay test
B Release Display to save your input.
B Press Back twice to return to the next higher level.
The relay test is terminated.
15
Carrying out an LCD test
With menu LCD test it can be checked whether all signs and symbols are
fully displayed.
B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu LCD test appears.
B Press button Display.
The LCD is OK, when all symbols are correctly displayed.
B Press Back to return to the next higher level.
At the end of the Relay test, all settings are cancelled.
Special parameter | 41
closed
6 720 802 836-94.1TL
6 720 802 836 (2012/05)
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