19
11.3
Low pressure cut-out
When this cut-out occurs, the code
"AP"
(pressure alarm) will
begin to flash on the digital display
(13)
and the alarm warning
pilot light will flash. The burner and circulating pumps will
switch off, cutting off the heating and water flow to the
installation.
This occurs when the boiler pressure drops to below 0.5 bar, preventing the boiler from functioning
when the water is drained from the installation, either due to leakage or maintenance operations.
To unblock it, fill the installation again until the digital display
(13)
indicates a pressure of 1 - 1.5 bar.
12
DRAINING THE BOILER
The water is drained from the boiler by opening the air drain valve
(1)
inside the boiler (on the lower
right hand side on opening the door). Connect a flexible tube to this valve and run it to a drain. After
draining the boiler, close the valve again and remove the flexible tube.
13
SWITCHING OFF THE BOILER
To switch off the boiler, press the On/Off button
(17).
In
Off mode
, when the boiler is plugged into the
mains and connected to the fuel installation, its heating and hot water functions will be switched off,
but the anti-frost protection and pump anti-blocking functions will be activated.
To switch off the boiler completely, unplug it from the mains and cut off the fuel supply.
14
INITIAL START-UP
In order for the
guarantee to be valid
, the boiler must be started up by an
authorised DOMUSA
Technical Assistance Service
. Before beginning start-up, the following must be complied with:
- The boiler is to be electrically connected to the mains.
- The installation is to be filled up with water (the display must indicate 1 - 1.5 bar).
- Fuel must be reaching the burner at a pressure of not over 0.5 bar.
15
DELIVERY AND INSTALLATION
After the initial start-up, the Technical Assistance Service will explain to the user how the boiler
functions, informing of the most important points.
The installer is responsible for making clear to the user the functioning of any control or regulation
device that forms part of the installation but is not supplied with the boiler.
AL AP
bar
ºC
