Initial Checks Before Turning On; Opening The Service Valves; Checking The System Pressure - Vaillant ecoTEC SERIES Instructions For Use Manual

4 Operation
4.3

Initial checks before turning on

4.3.1 Opening the service valves

Note
If a bottom cover is fitted to the boiler the ser-
vice valves are behind this cover.
4
3
Fig. 4.5 Opening the service valves on ecoTEC plus combina-
tion boilers
4
3
Fig. 4.6 Opening the service valves on ecoTEC system boilers
• Ensure that the service valves in the heating flow and
return (4 and 1) and the gas service valve (3) are
open. The flow, return and gas service valves are open
when the screwdriver slot is in the same direction as
the pipework.
8
• On ecoTEC combination boilers only:
Ensure the cold water service valve (2) is open. This
can be checked by opening a hot water tap and ensu-
ring water flows.
Caution
The pressure relief valve is provided for safety
reasons and must not be interfered with.
2

4.3.2 Checking the system pressure

1
90˚
2
Fig. 4.7 Checking the filling pressure of the heating system
1
• Check the water pressure of the system using the
pressure gauge (1) before putting the boiler into oper-
ation. For the heating system to operate properly, the
indicator on the pressure gauge must be in the dark
grey zone when the system is cold. This is a filling
pressure between 1.0 and 2.0 bar. If the indicator is in
the light grey area (below 0.8 bar), fill the system up
with water before putting the boiler into operation.
Note
The ecoTEC appliance has a pressure gauge and
90˚
a digital pressure display.
The pressure gauge allows you to quickly check
whether the filling pressure is in the correct
range, even when the appliance is switched off.
When the appliance is in operation, you can see
the exact pressure in the display. Activate the
pressure display by pressing the "-" button (2).
After 5 seconds the display returns to the flow
temperature.
plus pro
i F P
bar
Instructions for use ecoTEC
bar
1