Adjustments - Honeywell Hauck MEGASTAR MS-25 Instructions Manual

2. The combustion air must cycle to 60 Hz for purging the system before light off, the safety
limits must be satisfied, and the purge air pressure switch must be made for the purge to
begin. The plant exhaust fan must be running with its damper open sufficiently for the
proper purge time. The minimum purge time is the time required for four volumes of air to
flow through the entire combustion and exhaust system (including the baghouse and flue
stack). For most applications, the combustion air blower will modulate from 16Hz at low fire
to 60Hz at high fire.
3. Set the low gas pressure switch to an initial setting of 0.5 psig (3.4 kPa).
4. Set the high gas pressure switch to an initial setting of 5 psig (34.5 kPa).
5. The fuel valve must be adjusted for proper flow control. See individual burner performance
sheets for fuel flows. Adjustment can be electronically performed with bias points
characterizing the valve position, or it can be set manually so that the closed position
provides the correct flow rate for low fire.
6. Before light off, the combustion air blower must be running at 16Hz; the contacts in the
combustion air switch must be set to close at 1" wc (25 mm wc). The low fire fuel limit
switches, located on the fuel manifold, must be set to have closed contacts when the fuel
valve is at low fire. Do not attempt to ignite the burner unless it is at low fire.
V. ADJUSTMENTS
1. In order to drive each control motor, consult burner control panel instructions.
2. The spin vane adjustment affects the flame shape and combustion intensity. Spin set at 0°
will produce a long narrow flame; a spin setting of 50° will produce a short wide flame (see
individual burner capacity and performance data sheets). For most applications, the spin
should be set in the mid range (30° - 45° on indicator). For a very short flame, in a large
diameter combustion zone, the spin can be set on maximum (50° on indicator). Caution
is advised as overheating of the combustion flights or drum could occur when using
maximum spin. When adjusting the spin to less than 30° for a long flame, check the exhaust
gas to make sure the flame is not too long that it extends into the veiling zone of the dryer
(this can lead to incomplete combustion resulting in high CO and unburned hydrocarbon
emissions in the flue gas).
The MegaStar
completely in the recommended combustion space. Flame adjustments on new
installations should be started with a narrow flame (30°) spin setting. Drum
temperatures should be checked using a hand held non-contact infra-red
thermometer particularly in the combustion zone area. The flame shape can then
be widened while observing drum temperature in the combustion zone.
3. During the adjustment process take exhaust gas measurements to verify that complete
combustion is taking place (see Application Sheet GJ73 for general information on
conducting exhaust gas analysis).
TM
Burner flame is very intense. It is designed to burn quickly and
WARNING
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