Wolf CGG-1K-24 Installation And Operating Instructions Manual page 28

3. Checking and adjusting the nozzle pressure
Connect the test equipment:
- The boiler must be switched OFF.
Open the gas shut-off valve.
- Remove the casing cover.
- Undo the plug at test nipple
- (+) Connect the differential pressure tester with a hose at

test nipple .
- (-) Connect the differential pressure tester with a hose at

test port of the combustion chamber casing.
- Start the boiler by turning the heating water temperature
selector to position 8.
- Read off the nozzle pressure Pmin (at minimum boiler output)
within 180 seconds of ignition (soft start phase = minimum
output).
- Turn the heating water temperature selector further to the
emissions test position [chimney sweep].
- Read off the nozzle pressure Pmax (at maximum boiler
output) within the 15 minute test phase.
- Compare the actual values with those in the table.
Gas fired Output
boiler
CGG-1K-24
CGG-1K-28
Table: Nozzles pressures to be maintained
28
Conversion to other gas types

.
Thermal load
kW kW
9,4 10,4
24,0 26,7
10,9 12,0
28,0 31,1
Nozzle pressures in mbar (1013 mbar; 15 °C)
Natural gas H
Ws = 14.1 kWh/m³
= 50.7 MJ/m³
Pmin 2,1 ± 0,5
Pmax 12,3 ± 0,5
Pmin 2,1 ± 0,5
Pmax 12,7 ± 0,5


Butane Propane
Ws = 24.3 kWh/m³ Ws = 21.3 kWh/m³
= 87.3 MJ/m³ = 76.8 MJ/kg
4,5 ± 0,5 6,0 ± 0,5
26,6 ± 0,5 34,4 ± 0,5
4,5 ± 0,5 6,0 ± 0,5
26,6 ± 0,5 34,5 ± 0,5
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