Viessmann Vitoflame 300 VHG III Service Instructions Manual page 7

Checking the oil pressure and vacuum , adjusting...
Fig. 2 Oil pump make: Danfoss
Fig. 3 Oil pump make: Suntec
E
Fig. 4
Commissioning, inspection, maintenance
(cont.)
01. Switch system OFF at mains isolator and safe-
guard against unauthorised reconnection.
02. Unscrew plug "P"
A
03. Unscrew plug "V"
B
Note
Oil may leak from the oil pump when doing this.
04. Insert a pressure gauge (measuring range 0 -
40 bar) and a vacuum gauge (measuring range 0 -
1 bar).
Note
Only seal in the pressure and vacuum gauges with
copper or aluminium gaskets or with O-rings.
Never use sealing tape.
05. Start the burner.
Note
The solenoid valve opens.
06. Read off the oil pressure and the vacuum of the
pump on the relevant gauge (vacuum should be
max. 0.35 bar at a height differential of 3 m
between the oil pump and the bottom of the tank).
Note
If the vacuum pressure is higher than 0.35 bar,
check the filter for contamination and check the
pipe run.
07. Should the CO value fall outside the range of 13
2
to 14 % by vol., adjust the CO
the oil pressure.
Note
Subject to pump type, the pressure adjusting
screws may be located at the front or on the side
of the oil pump.
■ For burner stage 2, set the oil pressure at pres-
sure adjusting screw
is factory-set to setting 2.
■ For burner stage 1, set service switch
ting 1; open the flap to do so. Adjust the oil pres-
sure by means of pressure adjusting screw
Clockwise turn pressure increases.
→
Anti-clockwise turn
→
Note
For standard values for burner settings, see page.
from the oil pump.
from the oil pump.
value by regulating
2
. The service switch
D E
to set-
E
C
pressure decreases.
.
7