A.O. Smith Cyclone BFC-28, Installation, User And Service Manual

Page: 71 / 104

Instruction manual BFC 69
is
12 Service program
12.1 Introduction
The service program is used by the installation
engineer or service and maintenance engineer for:
•
Displaying the water heater history;
• Displaying the error history;
• Displaying the water heater history;
• Display the selected water heater;
• Switching the pump on or off;
• Setting the service interval;
• Service mode;
• Setting legionella prevention.
These sub-menus are briefly described in the
following paragraphs. If you are not generally familiar
with the use of the displays and menus, first read the
relevant chapter (7 "The control panel").
Note
The notation convention for the service menu is
identical to that of the main menu (11.2 "Notation
convention for menu-related instructions"). The
difference is, you use
to bring up the service
program, instead of which brings up the main
menu.
12.2 Setting the hysteresis
If the preset temperature (SET POINT) is higher than
the current water temperature, the water heater might
not immediately start the operating cycle (9.3 "The
appliance's heating cycle"). To prevent excessively
frequent switching on and off, there is a heating
margin. This margin is called the hysteresis. The
standard setting for this margin is 5°C. The operating
cycle starts when the water temperature drops to 5°C
below the SETPOINT and ends when the water
reaches 5°C above the SETPOINT.
Set the hysteresis as follows:
•
:
HYSTERESIS UP
The figure shows an example
Set the hysteresis as follows
•
:
HYSTERESIS DOWN
12.3 Displaying the error history
Display the error history as follows:
•
:
ERROR HISTORY
The controller will display an overview of "Blocking
errors" and "Lock out errors". In both cases, note that
the controller reserves 15 lines for the last 15 error
messages. If there are fewer than 15 error messages,
an ellipsis (...) is displayed. The display first shows the
"Blocking errors". When
is pressed, the
"Lock out errors" are then displayed.
The figure shows an example of "Blocking errors". In
this case, the text
ERROR HISTORY
is followed by
(B)
.
The figure shows an example of "Lock out errors". In
this case, the text
ERROR HISTORY
is followed by
(L)
.
Note
For an overview of all errors and the possible
causes, please refer to the relevant
chapter (13 "Errors").
12.4 Displaying the water heater history
The water heater history sub-menu is used to display
the burning hours, the number of ignitions, the number
of flame errors and the number of ignition errors.
SERVICE MENU
»HYSTERESIS
^ ERROR HISTORY
È APPLIANCE HISTORY
SELECT APPLIANCE
PUMP RELAY
SERVICE INTERVAL
SERVICE OPERATION
ANTI LEGIONELLA
HYSTERESIS UP »3ÉC
ERROR HISTORY(B)
S04 SENSOR ERROR
F06 IONIZATION
È CO2 50 HZ ERROR
ERROR HISTORY(L)
F02 FAN
F07 FLAME ERROR
È ...