Viessmann GS1, Service Instructions Manual

Page: 9 / 36

9
Initial start−up, inspection and maintenance
Further details regarding the individual steps
(cont.)
Checking nozzle pressure
1. Close the gas shut−off valve.
2.
Release the screw inside test
nipple
A
, but do not remove
completely, and connect the
pressure gauge.
3. Open the gas shut−off valve.
Start up the boiler.
4. Check the nozzle pressure.
In case of deviation from the
value in the table on page10
,
remove protective cap
B
.
Adjust the nozzle pressure
with screw
C
.
5. Check setting values and record
in the service report.
6. Fit cap
B
.
7. Switch OFF the system at the
control unit (the boiler shuts
down), close the gas shut−off
valve, remove the pressure
gauge and close test nipple
A
with the screw.
8.
¨ Safety instructions
Open the gas shut−off valve,
start up the boiler and check
soundness of test nipple
A
.
5692413GB
C
B
A