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6 Commissioning and startup
6.1.2 Air pressure switch presetting
The air pressure switch presetting is only valid during commissioning. After completing
the commissioning, the air pressure switch must be set correctly.
Air pressure switch pre-setting prior to commissioning:
- approx. 1.4” w.c.
6.1.3 Gas pressure regulator presetting
Add the combustion chamber pressure in “w.c. to the setting pressure into the gas
butterfly valve.
u Determine the setting pressure from the table below.
The values in the table are calculated under ideal conditions.
Natural gas Propane
Calorific value = 1,000 BTU/cu-ft Calorific value = 2,500 BTU/cu-ft
Burner firing rate Nat. gas manifold pressure Propane manifold pressure
in MBTU/h (kW) in “w.c. (mbar) in “w.c. (mbar)
273 (80) 3.3 (8.5) 3.6 (9.3)
307 (90) 3.3 (8.5) 3.6 (9.3)
341 (100) 3.3 (8.5) 3.6 (9.3)
375 (110) 3.3 (8.5) 3.6 (9.3)
410 (120) 3.3 (8.5) 3.6 (9.3)
444 (130) 3.5 (8.9) 3.8 (9.6)
478 (140) 3.6 (9.3) 3.9 (9.9)
512 (150) 3.8 (9.6) 4.0 (10.2)
546 (160) 3.9 (9.8) 4.1 (10.4)
580 (170) 4.0 (10.1) 4.2 (10.7)
614 (180) 4.1 (10.3) 4.3 (11.0)
648 (190) 4.2 (10.6) 4.7 (11.9)
682 (200) 4.3 (10.9) 5.0 (12.8)
The table values are guidelines for basic settings. Variations may occur during
commissioning, depending on local conditions.
Installation and Operating Instructions
G
as burner WG20.../1-C ZM-LN (W-FM 25)
83055116 • 1/2016-05
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