Checking The Nozzle Pressure - Viessmann Vitogas 200-F GS2 Service Instructions Manual

Further details regarding the individual steps

Checking the nozzle pressure

A Top test nipple: "P.IN" (input), static
and supply pressure
B Plug with connecting cable
C Hexagon screw (full load adjust-
ment)
Commissioning, inspection, maintenance
(cont.)
D Phillips screw (partial load adjust-
ment)
E 2 plugs a:Ö (modulation coil)
F Bottom test nipple: "P.OUT" (out-
put)
G Nozzle cap
H Gas nozzle
K Gas manifold
Disabling the l.h. gas train (BV1)
1. Close the gas shut-off valve.
2. Seal at least the r.h. half of the gas
nozzles H with nozzle caps G sup-
plied.
3. Open the screw at bottom test nipple
F of the l.h. gas train (BV1) by one
full turn.
4. Connect the pressure gauge at bot-
tom test nipple F of the l.h. gas train
(BV1) to check the nozzle pressure.
5. Disconnect plug B from the r.h. gas
train (BV2).
6. Open the gas shut-off valve.
Start the boiler.
7. Enable the emissions test function
"S" (full load):
Operating instructions
8. Counterhold Phillips screw D.
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