36
3062347_0309
Check nozzle pressure
3.
Checking and adjusting the nozzle pressure:
- The gas fired boiler must be switched OFF.
- Open the gas shut-off valve.
- Remove boiler casing cover and move the control unit
to the front.
- Undo the plug at the test nipple [2].
- (+) Connect the differential pressure tester with a hose
at test nipple [2].
- (-) Connect the differential pressure tester with a hose
at test port [3] of the combustion chamber casing (only
CGG-2(K)).
- Start the boiler by turning the heating water temperature
selector to position 8.
- Read off the nozzle pressure P
min
(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 symbol].
- Read off the nozzle pressure P
max
(at maximum boiler
output) within the 15 minute test phase.
- Compare the actual values with those in the table.
- Close the plug again.
[2]
[3]
Gas pressures for gas throughput adjustment according to the nozzle pressure method
Table: Nozzle pressure table
Nozzle pressure in mbar (1013 ±0.5 mbar; 15 °C)
Gas fired boilers
(gas fired combi
boilers)
Rated output P
in kW
Rated thermal
load
Q in kW
Natural gas H
W
1
= 45.7 MJ/m³
= 12.7 kWh/m³
LPG P
W
1
= 70.7 MJ/m³
= 19.6 kWh/m³
CGU-2(K) -18
18.0
20.2
12.7
26.7
15.3
17.3
9.5
20.0
13.0
14.8
7.1
14.8
10.9
12.5
5.2
10.7
8.0
8.8
3.2
5.8
CGU-2(K) -24
24.0
26.5
12.9
25.4
20.4
22.5
9.4
18.7
16.0
18.1
6.3
12.3
13.0
14.9
4.4
8.5
10.9
12.0
3.1
6.0
CGG-2(K) -18
18.0
19.7
15.9
36.0
15.3
16.7
11.4
25.9
13.0
14.2
8.8
19.3
10.9
12.0
6.3
14.1
8.0
8.5
3.3
7.5
CGG-2(K) -24
24.0
26.5
16.8
35.8
20.4
22.5
12.2
26.1
16.0
17.7
7.5
15.9
13.0
14.0
4.8
10.0
10.9
11.7
3.4
7.3
Summary of Contents for CGG-2-18
Page 64: ...64 3062347_0309 Notes ...
