4.5 Adjusting gas pressure switch
Gas pressure switch, max.
1 Adjusting scale
2 Reset, gas pressure switch, max.
3 Pressure measuring connection
A416M ver. 3
Gas pressure switch max. should cause a permanent interlocking if burner capacity
increases to be more than 1.15 times the nominal value, or if the pressure exceeds
more than 1.3 times the nominal pressure.
Burner
Factory setting "W.C.
350 M
22.1
450 M
20.9
To adjust gas pressure switch to maximum, without flue gas analyzer
Adjust gas pressure switch after burner adjustments and flue gas analysis.
1. Turn gas pressure switch adjusting scale to the maximum position.
2. Run burner to the desired maximum capacity.
3. Increase burner capacity to be 1.15 times the desired maximum capacity by raising
gas pressure.
4. Slowly turn switch to the minimum until burner shuts down. Now the adjustment is
correct.
5. Reset gas pressure switch.
6. Run burner back to the desired maximum capacity by decreasing gas pressure.
To adjust gas pressure switch to maximum, with flue gas analyzer
Adjust gas pressure switch after burner adjustments and flue gas analysis.
1. Turn the gas pressure switch to its maximum value.
2. Adjust burner to the desired maximum capacity; for example so that O
2
content =
2.5–3.0 % and CO content < 50 ppm.
3. Increase the capacity by raising the gas pressure until the O
2
content = 1.0 % and
CO content < 2000 ppm.
M4248 2316EN
39 (114)
