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Midco International Inc.

7

8471 34

Installation

Net Pro

fi

 le Area = Rated Fan (SCFM) ÷ Pro

fi

 le Velocity (SFPM)

The Pro

fi

 le Velocity should be determined based on the burner 

fi

 ring rates. If we choose to 

fi

 re the 

burner at 675,000 BTU/hr/ft then the pro

fi

 le opening should be sized for a pressure drop of 0.8 

 

W.C. across the burner.  If the 

fi

 ring rate is 450,000 BTU/hr/ft then the pro

fi

 le opening should be 

sized for a pressure drop of 0.4 

 W.C. across the burner. The corresponding pro

fi

 le velocity across 

the burner should be determined from Chart 4 or use the following equation.

 

 

For the 675,000 BTU/hr/ft 

  Net 

Pro

fi

 le Area = 5000 (SCFM) ÷ 3086 (SFPM)=1.62 ft

2

 

 

For the 450,000 BTU/hr/ft 

  Net 

Pro

fi

 le Area = 5000 (SCFM) ÷ 2182 (SFPM)=2.29 ft

2

 

To calculate the pro

fi

 le area needed for both cases:

  Pro

fi

 le Area = Net Pro

fi

 le Area + Total Burner Area

 

 

For the 675,000 BTU/hr/ft  

  Pro

fi

 le Area = 1.62 + 0.650 = 2.27 ft

2

 

 

For the 450,000 BTU/hr/ft  

  Pro

fi

 le Area = 2.29 + 0.975 = 3.265 ft

2

 

To calculate the length of the pro

fi

 le opening add burner length to the desired clearance:

 

 

For the 675,000 BTU/hr/ft case   

 

 

 

12 inch + 4 inch (2 inches on each side) = 16 inch (1.3 ft) 

 

 

For the 450,000 BTU/hr/ft case 

 

 

 

18 inch + 4 inch (2 inches on each side) = 22 inch (1.83 ft) 

 

To calculate the height of the pro

fi

 le opening divide the pro

fi

 le area by the pro

fi

 le length:

 

 

For the 675,000 BTU/hr/ft case 

   2.27 

ft

2

 ÷ 1.3 ft = 1.75 ft (21 inch) 

 

 

For the 450,000 BTU/hr/ft case 

   3.265 

ft

2

 ÷ 1.83 ft = 1.78 ft (21.5 inch)

1.  Conversion of SCFM to Actual CFM of air
 

SCFM = CFM x    

ρ

 

 

 

                  _____

 

 

                  0.075

2.  Air density as a function of Temperature  --   

ρ

 = 1.35 x    Barometric Pressure (in Hg)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(out)

 + 460

3.  Change in Standard Barometric Pressure as a function of Altitude
 

Barometric Pressure (in.Hg) = 29.921x (1-6.8753 x 0.000001x altitude (ft))^5.2559

4. Temperature 

di

 erence   --   Temperature Rise =   T 

(out)

 - T 

(in)

5.  Energy equation  - -   BTU/hr = SCFM x Temperature Rise x 1.08 / 0.92
 

 

Where:  1.08 is a sensible heat equation constant

   1.08 

0.2397 

(

 BTU 

)

  x 60  

(

 min

 x  0.075 

(

 lb  

)

 

 

                                 ____                 ___                      ___

lb 

   

 

 

    

Ft

3

      ___________________________________

Pro

fi

 le Setup Example

Continued

Profile Velocity

075

0

945

P

Δ

=

.

Profile Velocity

075

0

945

=

.

0

.

8

=

3086(SFPM)

Profile Velocity

075

0

945

=

.

0

.

4

=

2182(SFPM)

Summary of Contents for Blue Flame Series

Page 1: ...he burner combustion zone the flame is more stable shorter and cleaner permitting the reduction of emissions levels and allowing for higher temperature rise and higher tolerance to varying conditions...

Page 2: ...ation of its products at any time All information is based on laboratory testing Di erent unit size and or configurations may a ect data Cast Iron CI Aluminum AL Burner Configurations HMA 2 HMA 2A HMA...

Page 3: ...lication specific and will vary 0 20 40 60 80 100 120 0 0 0 1 0 2 0 3 0 4 0 5 0 20 40 60 80 100 120 0 0 0 1 0 2 0 3 0 4 0 5 0 20 40 60 80 100 120 0 0 0 1 0 2 0 3 0 4 0 5 NO Emission 2 NO Emission 2 NO...

Page 4: ...er W C BTU hr ft Propane Gas Natural Gas 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 100 000 200 000 300 000 400 000 500 000 600 000 700 000 BTU hr ft Propane Gas Natural Gas Manifold Fuel Gas Pressure W...

Page 5: ...ft per ft 2900 7 550 000 19 000 29 1 13 16 20 2550 55 550 000 18 000 30 1 15 19 22 ideal 2300 45 550 000 17 000 32 1 17 20 24 Reduce capacity 4 per each 1000 ft altitude over 2000 ft Flame lengths are...

Page 6: ...ile for a 5 000 SCFM and a 115 degrees temperature rise 1 Required BTU BTU hr Blower SCFM x Desired Temp Rise x 1 08 92 BTU hr 5 000 SCFM x 115 T x1 08 92 675 000 BTU hr 2 Required Burner Length Feet...

Page 7: ...gth of the profile opening add burner length to the desired clearance For the 675 000 BTU hr ft case 12 inch 4 inch 2 inches on each side 16 inch 1 3 ft For the 450 000 BTU hr ft case 18 inch 4 inch 2...

Page 8: ...of any obstructions that can create turbulent e ect on the air Note Any reinforcements around the profile plates should be down stream of the profile plate Static pressure probes are needed to sense t...

Page 9: ...positioning will take advantage of the blower mixing e ect and ensure minimum temperature stratification It will also allow for a relatively uniform airflow across the burner resulting in a clean com...

Page 10: ...ve Manual Pilot Valve Combination Gas Valve with Main Pilot Regulator Main Manual Gas Valve A heater having an input over 400 000 BTU Hr shall have provisions for measuring gas pressure between the va...

Page 11: ...urner o check the Flame Safety Air Proving System a Check the operation of the air proving system for low and high airflow setting Refer to the Specifications of the Flame Safety Control for setup ins...

Page 12: ...l spark to the end of the gas tube 7 Main burner ignition Close the manual gas valve a Set the Modulating Gas Control System to low fire position Slowly open the manual gas valve The flame should be e...

Page 13: ...3 Change the spark rod igniter 4 Insure the flame sensor is in good condition Use a sti wire brush to clean the burner plates Scrub both sides of the stainless steel burner plates to remove any soot o...

Page 14: ...minum HMA 2 1050800 HMA 2A 1050810 Cast Iron HMA 2 1010700 HMA 2A 1010710 Aluminum HMA 2 1010800 HMA 2A 1010810 Cast Iron HMA 2 1080700 HMA 2A 1080710 Aluminum HMA 2 1080800 HMA 2A 1080810 Cast Iron H...

Page 15: ...lot Detail Spark Gap Measurement Brute Pilot UV Scanner Mount 1200350 1 8 Brute Pilot w Spark Rod 1190850 Brute Pilot 1190850 1190850 Spark Rod Flame Rod Brute Pilot 1200350 Spark Rod and UV Brute Pil...

Page 16: ...1 10 24 4 3 11 14 2 13 1 15 12 8 6 7 11 10 9 16 2 Straight 6 Straight 12 Straight Ell Section Tee Section 5 18 3 1 1 11 21 23 19 20 4 25 1 14 6 22 17 6 Figure 8 Typical Burner Assembly Parts Isometric...

Page 17: ...5 35 1 8 HMA 2 2A Tee Ba e 1395 11 1 2 9 Elbow Casting Section See above listing for proper selection 10 Inside Ba e Clamp 1356 10 2 4 11 10 24x9 16 Phillips Rd Hd S S Mach Screw Hardware 2 4 4 8 8 8...

Page 18: ...ce cement is to be applied between the casting and either blank plate pilot plate and end flanges only not between ba es and end plates 2 The hardware listed on instructions A and B applies to each en...

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