Checking The Nozzle Pressure - Viessmann VITOPEND 100-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the nozzle pressure

A Test nipple
B Cap
C Screw
D Phillips screw
1. Switch OFF the control unit ON/
OFF switch (the boiler shuts
down).
Turn rotary selector "tr" fully
anti-clockwise.
2. Close the gas shut-off valve.
18
(cont.)
3. Release the screw inside test nip-
ple A, but do not remove, then
connect the pressure gauge.
4. Open the gas shut-off valve.
Switch ON the system ON/OFF
switch on the control unit.
5. Select the upper output:
Turn rotary selector "tw" fully
clockwise (leave at that position
briefly), then turn it back.
LEDs "tw" and "tr" flash
simultaneously.
Note
The operation with the upper
rated output is automatically reset
after approx. 30 min or by switch-
ing the power OFF and ON again.
6. Remove cap B from the gas
train.
7. Test the nozzle pressure at the
upper rated output. In case of
deviations from the value shown
in the following table, adjust
screw C for the upper rated out-
put (SW 10).