9
Operating manual ecoCRAFT 0020058717_03
This operating mode can only be ended:
- via vrnetDIALOG or
- by altering the temperature setting on the rota-
ry knobs (
8
) or (
9
) by more than
±
5 K.
This operating mode can not be ended:
- by pressing the "Fault reset" button (
7
)
or
- by switching the unit on or off.
Heating mode active
permanently on:
Heating operation
flashing:
Burner anti-cycling time
active
Hot water generation active
permanently on:
Cylinder charging mode
in standby
flashing:
Domestic hot water cyl-
inder is being heated,
burner on
Internal heating pump is in operation
Actuating internal gas valve
Display of the instantaneous burner
modulation rate (bar graph display)
Flame with cross:
Fault during burner operation;
Unit is switched off
Flame without cross:
Burner operation normal
4.2
Measures prior to commissioning
4.2.1
Opening the isolating elements
h
Note
The isolator devices are not included in the
scope of delivery for your unit. They are fitted
by your heating engineer on site. He must ex-
plain to you the position and handling of these
components.
4.2.2 Checking
system
pressure
1
Fig. 4.3 Checking the filling pressure of the heating system
• Check the filling pressure of the system during start-
up. To do this, press the "-" button; the system pres-
sure will be displayed instead of the current flow tem-
perature for approx. 5 seconds.
The filling pressure must lie between 1.0 and 2.0 bar
when the system is cold in order for the heating installa-
tion to operate properly. If the pressure is lower than
this, the water must be topped up before starting up
(see Section 4.7.4).
h
Note
When the unit is in operation, you can have the
exact pressure shown in the display. Activate
the pressure display by pressing the "-" button
(1). After 5 seconds the display returns to the
flow temperature. You can also switch continu-
ously between the temperature and pressure in
the display by keeping the "-" button pressed
for roughly 5 seconds.
Note
To avoid running the system with too little
water and thus prevent damage, your appliance
has a pressure sensor. This signals the low
pressure level if the level falls below 0.6 bar by
the water pressure value in the display flash-
ing.
If the pressure falls below 0.3 bar, error mes-
sage F.22 (low water pressure) appears and the
burner is blocked. If the pressure falls below
0 bar or if it exceeds 9 bar (= defective sensor),
the Vaillant assured comfort mode is activated.
The output and the maximum possible flow
temperature are restricted. Status 40, alter-
nating with F22 (low water pressure) is dis-
played. In this case, please have the system re-
filled by your heating engineer.
If the heating system extends over several storeys, a
higher filling pressure may be required. Ask your engi-
neer for details.
Operation 4
