Midco HMA-2 & HMA-2A Series - Manual (Page 2)

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Midco International Inc.
8471 34
Specifi cations
Specifi cations
*Firing Rate .............................................................. Up to 750,000 Btu/hr/ft
750,000+ Contact Midco
Burner Manifold Pressure
Natural Gas ................................................. 4.2 to 8 inch W.C.
Propane Gas .............................................. 1.6 to 3 inch W.C.
Pilot Capacity ............................................................ 12,000 Btu/hr
Pilot Manifold Gas Pressure
Natural Gas ................................................. 3.5 inch W.C.
Propane Gas .............................................. 2.0 inch W.C. **
Pressure Drop Across the Burner ............................ 0.05 to 1.4 inch W.C.
Air Velocity Across the Burner ................................... 800 to 4,000 FPM
Burner Turn-down Ratio ........................................... 30 to 1 (based on Btu / ft)
Flame Length ....................See page 5 for fl ame length Chart 5, and Tables 2 & 3
* Firing rate is dependent on the pressure across the burner. Please see the included
charts for recommended burner sizing.
** Using a natural gas pilot on propane.
*** See Page 14, Figure 6 for burner confi guration reference.
**** See Page 15, Figure 7 for pilot confi guration reference
Midco International Inc. reserves the right to change the construction or confi guration of its products at any time.
All information is based on laboratory testing. Different unit size and/or confi gurations may affect data.
Cast Iron (CI) Aluminum (AL)
*** Burner Confi gurations HMA 2 HMA 2A HMA 2 HMA 2A
2″ Straight Section (2A only) - - - 1020810
6″ Straight Section 1050700 1050710 1050800 1050810
6″ Straight Section with Back Inlet 1230700 1230710 1230800 1230810
12″ Straight Section 1010700 1010710 1010800 1010810
12″ Straight Section with Back Inlet 1060700 1060710 1060800 1060810
Elbow Section 1070700 1070710 1070800 1070810
Tee Section 1080700 1080710 1080800 1080810
**** Pilot Confi gurations Part # Natural # Propane #
Brute Pilot Spark Rod and Flame Rod 1190850 1190950
Brute Pilot Spark Rod and UV Mount 1200350 1200450
Brute Pilot Spark Rod 1342-03
Brute Pilot Flame Rod 1360-03
(Direct) Spark Rod and Flame Rod 1190800 1190900
(Direct) Spark Rod and UV Scanner Mount 1200300 1200400
Remote Flame Rod 1220800
Remote UV 1240800
Pilot with Spark Rod only 1210800 1210900
Flame Rod (Direct Spark, Std + Brute) 1360-03
Spark Rod (Direct Spark) 1342-06
Table 1 - Burner and Pilot Confi gurations