Viessmann Vitogas 200-F GS2 Service Instructions Manual page 14

Commissioning, inspection, maintenance
Further details regarding the individual steps
9. Reduce the nozzle pressure at the
l.h. gas train (BV1) with hexagon
screw C to 0 (no end-stop).
Note
Turning anti-clockwise: Nozzle pres-
sure decreases.
Note
The flame of the main burner extin-
guishes and the flame of the pilot burner
stays lit.
Adjusting the r.h. gas train (BV2)
01. Remove the pressure gauge from
bottom test nipple F of the l.h. gas
train (BV1) and seal aperture with
screw.
02. Open the screw at bottom test nip-
ple F of the r.h. gas train (BV2) by
one full turn.
03. Connect the pressure gauge at bot-
tom test nipple F of the r.h. gas
train (BV2) to check the nozzle pres-
sure.
04. Connect plug B to the r.h. gas train
(BV2).
05. Counterhold Phillips screw D.
06. Adjust the nozzle pressure at the
r.h. gas train (BV2) with hexagon
screw C in accordance with the
value in the table on page 16.
07. Check the setting values and record
them in the report.
14
08. Pull one of the two plugs a:Ö E
from the modulation coil on the gas
train.
Note
The flame of the main burner extin-
guishes.
09. Test the nozzle pressure at partial
load.
In case of deviation from the value
in the table on page 16:
■ Counterhold hexagon screw C.
■ Adjust the nozzle pressure at Phil-
lips screw D.
10. Check the setting values and record
them in the report.
11. Reconnect the plug a:Ö E previ-
ously pulled from the modulation
coil on the gas train.
Adjusting the l.h. gas train (BV1)
01. Disconnect plug B from the r.h.
gas train (BV2).
02. Remove the pressure gauge from
bottom test nipple F of the r.h. gas
train (BV2) and seal aperture with
screw.
03. Connect the pressure gauge at bot-
tom test nipple F of the l.h. gas
train (BV1) to check the nozzle pres-
sure.
04. Counterhold Phillips screw D.
(cont.)