General Operation | 4441DMC Gas Burner
GENERAL OPERATION and CONTROL
— DMC: DMC operation requires a solenoid valve in the gas line near the burner. The valve must be installed within 3 feet of the burner gas connection between the limiting orifice valve and the ratio regulator. — Control: Not for use with conventional BMS controls. Excellent performance with StepFire™, on-ratio and ther- mal turndown CMS controls. A limiting orifice valve must be installed in gas supply line within 1ft. of burner. A ratio regulator must be within 4 ft. of burner. Consult North Ameri- can for BMS control requirements. — Piping: For cross-connected systems, maximum gas pres sure at the burner can be adversely impacted by excessive pressure drop in the gas line between the ratio regulator and the burner. The design, selection and installation of these systems must take into account the gas pressure re quired at the burner to achieve the desired heat release (i.e. gas flow). For more detailed information on cross-connected control systems, see Sheet 4441DMC-3.
— Capacity: 400,000 to 2,600,000 Btu/h HHV in DMC at 16 osig air pressure.
— Combustion Air: 0.2-24 osig air pressure (max 150°F).
— Fuel: Natural gas. Gas pressure varies per size but 11 osig is maximum required at design capacity for 16 osig combus- tion air pressure, stoich ratio. — Flame Supervision: Flame rod or UV. Consult National Safety Standards and insurance underwriters for specific flame supervision requirements. Flame supervisory components must be ordered separately. See Dimensions and Part List 4441DMC-1 for correct flame rod part number. — Ignition: Direct spark (no pilot) with 6000 V transformer. A halfwave transformer prevents UV sensing of the spark during trial for ignition. Ignition not recommended above 16 osig main air pressure.
— Relight: Tempest® DMC burners require spark for reignition. They will not relight from a hot tile or furnace.
Table 1. 4441DMC Performance Data - Conventional Mode
(Performance for 16 osi main air pressure operating at stoichiometric ratio unless stated otherwise)
Burner Size
-3
4-A
-4-B
-5
-6
-7
Air Flow, not burning (scfh)
4000 3300
6100 5250
7100 6300
11 000 19 000 9500 15000
26 000 22 000
Air Flow,(scfh)*
Air Orifice DR,UA-DA, (in.wc) Gas Orifice DR, UG-DG (in wc)
17.4 8.5 9.9 13.5
16.4 6.5 8.8 11.9
14.6
15.5 2.9 7.2 8.0
7.3 2.6 9.0 9.9
7.1
6.5 9.8
3.8 7.0 7.7
Gas Pressure UG (osig)
Gas Pressure UG (osig), 30% XSF
Max. % XSA, (ignition and flame signal limit)** Max. % XSF, (ignition and flame signal limit)
30
30 20
30 24
30 28
30 36
30 45
Flame Length (in.) Flame Diameter (in.)
12
2
3
5
6
7
8
*Nominal capacities. ** Limits may vary depending on flame supervisory equipment used. Flame rod data represented in Table 1.
Table 2. 4441DMC Performance Data - DMC Mode
(Performance for 16 osi main air pressure operating at stoichiometric ratio unless stated otherwise)
Burner Size
-3
4-A
-4-B
-5
-6
-7
Air Flow, not burning (scfh)
4000 4000
6100 6100
7100 7100
11 000 11 000
19 000 19 000
26 000 26 000
Air Flow,(scfh)*
Air Orifice DR,UA-DA, (in.wc) Gas Orifice DR, UG-DG (in wc) Gas Pressure UG (osig) Gas Pressure UG (osig), 30% XSF Max. % XSA, (ignition and flame signal limit)** Max. % XSF, (ignition and flame signal limit)
200
200
200
200
200
200
30
30
30
30
30
30
*Nominal capacities. ** Limits may vary depending on flame supervisory equipment used. Flame rod data represented in Table 2.
Bulletin 4441DMC page 2
Note: DMC Mode features flameless combustion.
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