Plum ecoMAX920P1-S TOUCH, Installation And Operating Manual, Page: 42 / 48

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15.7 No communication
The control panel is connected with executive
module via RS485 cable. In case of cable
damage the alarm is displayed. The
controller does not switch off the regulation
and operates normally with previously
programmed parameters.
Check the cable connecting control panel
with the module and replace or repair it if
necessary.
15.8 No supply
In case of no supply the controller will return
to operation mode in which it operated
before power failure.
15.9 Unsuccessful boiler firing-up
attempt
The alarm will occur after unsuccessful
attempt of automatic boiler furnace firing-up.
After the alarm trips all pumps will be off in
order not to cause excessive boiler cooling.
Causes of this alarm can be e.g. damaged
lighter or no fuel in the container.
Alarm is erased by resetting the controller.
16 Firmware update
Simultaneous replacement of firmware in
module and controller’s panel can be done
using memory card.
Firmware update can be done
only by an authorized person,
keeping all precautions against
electric shock!.
To replace firmware:
 Disconnect controller’s electrical supply,
 Insert microSD HC memory card (other
card type is not supported) into indicated
slot, placed in a movable panel housing.
New software should be written on the
card in *.pfc format in the form of two
files: file with panel program and a file
with program for module A of the
controller,
 Place new firmware directly on the
memory card, do not place data in a
folder,
 Then connected electrical supply to the
controller and enter menu: Service
settings
→
Firmware update – replace
firmware first in main A module of the
controller, next in controller’s panel, then
in other devices.
17 Other controller functions
17.1 Power failure
In case of power failure the controller will
return to the mode in which it operated
before power failure.
17.2
Anti-freeze protection
When boiler temperature drops below 5  C,
the boiler pump will be switched on
overriding circulation of boiler’s water. If
water temperature will not increase, then the
boiler’s burner switches on.
This function cannot be the only
protection
against installation
freezing! Other methods should be
applied. The controller’s producer
is not responsible for damages
related to this.
17.3 Pumps standstill protection
function
The controller performs the CH, HUW pump
and mixers protection function against
standstill. It switches them on periodically
)every 167h for a few seconds). It protects
pumps against immobilization due to boiler
scale build-up. Therefore, during pause in
using boiler, the controller’s supply should be
connected. The function is performer also
with controller off (the controller in “Boiler
off” mode).
18 Lambda probe
The burner efficiency can be increased by
connecting additional Lambda probe module.