Honeywell Hauck MEGASTAR MS-25 Instructions Manual page 23

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TM
MegaStar
Model No.
(gpm)
75/100
1.25
125/150
3. When firing the burner with the compressed air atomizer, the threaded pipe plug must be
removed from the primary air tube. If using the low pressure oil or liquid propane nozzles,
the pipe plug must be installed in the primary air tube. When firing natural gas the pipe
plug can be installed or removed. The pipe plug is accessible through the main fan
housing access door (see Figure 11).
COMPRESSED AIR/OIL ADJUSTMENT
1. Air and fuel flows and pressures can be observed at the burner using the compressed air
and fuel flow meters and corresponding pressure gauges (see Figure 10). For compressed
air data in addition to Table 11, see individual MegaStar
2. Compressed air supply pressure to the inlet of the compressed air manifold must be 90 psig
(620 kPa) or greater. The supply pressure is measured via the gauge on the inlet to the
compressed air flow meter (see Figure 10). The compressed air low supply pressure switch
is preset at 60 psig (414 kPa). Set point adjustment may be required depending on the
burner and compressed air piping specifics.
3. For the compressed air manifold with regulator to function properly, the impulse line and
upper chamber of the pressure reducing regulator must be loaded with oil by opening the
vent valve on the regulator until oil vents then closing the vent valve.
4. Final compressed air flow and pressure adjustment is made via the compressed air trim
valve (see Figure 10). With the burner at high fire, adjust the trim valve until the compressed
air burner inlet pressure gauge, located downstream of the trim valve, reads approximately
60 psig (414 kPa). The compressed air low atomizing air switch is preset at 5 psig
(34.5 kPa). Set point adjustment may be required depending on the burner and compressed
air piping specifics.
5. Compressed air flow can be read directly from the compressed air flow meter
(see Figure 10). Refer to Figure 12 for detailed instructions on how to head the compressed
air flow meter. Verify that both the compressed air flow and burner inlet pressure, from step
4, meet or exceed the values given in Table 11 and/or the additional burner capacity and
performance data sheets.
Oil Pressure
To Burner
Oil Flow
Nozzle
(lpm)
(psig)
12
45.4
60
9
34.1
50
6
22.7
38
4.7
24
18
68.1
60
10
37.9
36
5
18.9
23
3
11.4
20
Table 11. Compressed Air and Oil Requirements
Compressed
Air Flow
(kPa)
(scfm)
(nm
414
60
1.6
345
52
1.4
262
48
1.3
165
42
1.1
414
90
2.4
248
85
2.3
159
82
2.2
138
80
2.1
TM
capacity and performance sheets.
Page 23
MS-9
Compressed
Air Pressure
To Burner
Nozzle
3
/min)
(psig)
(kPa)
55
379
44
303
32
221
17
117
50
345
30
207
20
138
19
131

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