K4
Changes in models reserved.
Dimensions not binding!
Operation
In case of normal operation in DHW or CH mode and no error conditions it is always possible to enter
the test mode as the higher priority mode of operation. This implies that there are no error conditions
present. If there was an error condition, test mode can be entered after normal operating conditions
are present again.
OFF mode
This is mode is selected by mean of the
K5
push button.
When selected, LCD is indicating:
STAND-BY mode
By mean of
K5
push button it possible to select boiler STAND-BY modes selecting Winter (both
DHW and CH modes are enable) or Summer (only DHW mode is enable) working conditions.
When Winter is selected, an no head demand is present, LCD is indicating:
When Summer is selected, an no head demand is present, LCD is indicating:
In case of water pressure switch usage, Supply temperature value is shown rather than water pres-
sure value/indication (scale).
In STAND-BY mode the fan is off, the gas valve is closed, Supply pump is switched off and the 3WV
is in DHW position.
Presetting CH supply temperature
Operate
K2
(decrease) and
K1
(increase) pushbuttons to select CH supply temperature within
20°C and CH user set point maximum value. This value is called CH user set point.
When
K2
or
K1
is pressed, the displays the temperature setting in 1°C steps in flashing mode:
5 sec. since last acting on
K2
or
K1
has been made, LCD come back to the previous display
condition.
Presetting DHW temperature
Operate
K6
(decrease) and
K7
(increase) pushbuttons to select DHW temperature within 30°C
and DHW user set point maximum value. This value is called DHW user set point.
When
K6
or
K7
is pressed, the displays the temperature setting in 1°C steps in flashing mode:
5 sec. since last acting on
K6
or
K7
has been made, LCD come back to the previous display
condition.
6.2 Modes Of Operation
The controller has a number of operation modes:
•
OFF mode, heat demands are ignored except for
CH and DHW frost protection calling
•
STAND-BY
•
CH mode
•
DHW mode
•
TEST or INSTALLER MODE, option for the installer
to test and set boiler parameters
•
ERROR/FAULT conditions like high temperature,
lockout, sensor fault, etc.
The priority of operating modes is fixed as follows:
1.
Error/fault mode
2.
Test or Installer mode
3.
DHW mode
4.
CH mode
5.
Stand-by mode
6.
OFF mode
25
