10
2.2 System Pressure
When the appliance is connected to a sealed central heating
system, the system pressure should be checked periodically by
means of the pressure gauge at the expansion vessel (see
Figure 4). The WS18 appliance comes complete with an
integrated expansion vessel, pressure gauge and filling loop.
The minimum pressure, as indicated by the black needle, must
not be less than 0.5 bar when the appliance is cold and typically
around 2.5 bar when the appliance is at normal operating
temperature. If the pressure is outside this range contact
Warmflow or your installer.
2.3 System Filling
After the system has been properly filled the pressure gauge should read 1 bar (refer to Figure
4) when the system is cold. The valve must be fully closed and the flexible filling loop removed
from the valve in accordance with building regulations. Expect a small water loss from the pipe.
At filling or refilling of the system, special attention must be given to the concentration of
corrosion inhibitors in the system water. Where there is a need for topping up, concentrations
must be restored to inhibitor manufacturers’ recommendations and monitored going forward.
Frequent or routine topping up of the system should not be necessary and may prove harmful to
the appliance. Should topping up prove necessary on a frequent or routine basis you must
contact Warmflow or your installer.
For further information refer to Section 3.2 Sealed Systems (see page 17)
2.4 User Control Interface
The appliance’s user control interface (see Figure 5) has been designed to maximise the ease
of use and efficiency of the heating system.
All user interactions with the appliance are via the display panel. Hence the display panel
should be mounted at an easily accessible location. The user control interface provides access
to appliance parameters such as temperatures, cleaning alerts, servicing and pellet level
indicators together with commissioning and service settings.
Display active alarms
Select main menu
Previous menu
Select UP
Select DOWN
Enter / select
1.1.1
Home Screen Icons and their meaning.
System Pressure
Figure 5: User Interface Display and Function Keys.
Figure 4: Reading System Pressure.
