12 service program, Service program, Introduction – A.O. Smith 120 through 250 Series User Manual
Page 67: Setting the hysteresis, Displaying the error history, 2 "setting, The hysteresis"), 12 "service program"), Just
Instruction manual BFC
67
is
12
Service program
12.1 Introduction
The service program is used by the installation
engineer or service and maintenance engineer for:
•
•
;
•
Displaying the appliance history
;
•
Display the selected appliance
;
•
•
;
•
•
Setting the display backlight time
•
Setting the display scroll speed
These sub-menus are briefly described in the
following paragraphs. If you are not familiar in general
with how to use the displays and menus, first read the
relevant section
Note
The notation convention for the service menu is
identical to that of the main menu
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 (SETPOINT) is higher than
the current water temperature, then the appliance
might not immediately start the heating
cycle
(9.3 "The appliance's heating cycle")
. To prevent
excessively frequent switching on and off, there is a
heating margin. We refer to this margin as the
hysteresis. The standard setting for this margin is 2°C.
The heating cycle starts if the water temperature drops
to 2°C below the SETPOINT and ends when the water
reaches 2°C above the SETPOINT.
Set the hysteresis via:
•
: HYSTERESE UP
The figure shows an example
Set the hysteresis via:
•
: HYSTERESE DOWN
12.3 Displaying the error history
Display the error history as follows:
•
: HISTORY OF ERRORS
The controller will display an overview of "Blocking
errors" and "Lock out errors". In both cases, the
electronic 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 HISTORY OF ERRORS is followed
by (B).
The figure shows an example of "Lock out errors". In
this case, the text HISTORY OF ERRORS is followed
by (L).
Note
For an overview of all errors and the possible
causes, please refer to the relevant
chapter
.
SERVICE MENU
»HYSTERESE
^ HISTORY OF ERRORS
È APPLIANCE HISTORY
SELECT APPLIANCE
PUMP RELAY
SERVICE INTERVAL
CONTRAST DISPLAY
TIME BACKLIGHT
SCROLLSPEED
HYSTERESE UP
»3ÉC
HISTORY OF ERRORS(B)
S04 SENSOR ERROR
F06 IONIZATION
È CO2 50 HZ ERROR
HISTORY OF ERRORS(L)
F02 FAN
F07 FLAME ERROR
И ...