Heat Wise SU-3 Manual Download Page 12 | Manualshive

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Summary of Contents for SU-3

Page 1: ...fied installer service agency or the gas supplier must perform installation and service At least once per year a qualified service agency needs to contracted for other than routine maintenance All installations must be made in accordance with all state and local codes which may differ from instructions in this manual The installer should inform and demonstrate to the user the correct operation and...

Page 2: ...cifications Model Range MBH Fuel Listing Gas Train Gas Conn SU 3 U S and Canada 199 to 400 Natural Gas And LP VR 8305 SU 4AN Canada 300 to 500 Natural Gas Only VR 8305M SU 4N H or F Canada 300 to 550 Natural Gas Only Two VR 8305M valves in parallel 1 SU 4P H or F Canada 300 to 550 LP Only VR 8305M SU 4N H or F U S 300 to 400 Natural Gas Only VR8305M ANSI Z 21 17 compliant SU 4P H or F U S 300 to 4...

Page 3: ...ulator or separate with shut off valves are all part of the factory assembled system When pressure switches are used the power 120V passes through each as a part of the limits they will trip power to the burner as soon as pressure increases or decreases to the system See the pictures below for common configurations of SU 3 and SU 4 gas trains The same gas valve is used for both natural gas and pro...

Page 4: ... nuts on the flange so that the burner is permanently secured Seal off any free openings with high temperature cement 1 Picture 4 STANDARD FLANGE Measure your insertion depth and mark the blast tube Deduct from the total length the deduction will prevent the tip of the flame tube from burning off Remove the blast tube by loosening the two 3 mm allen screws located on the housing near the base of t...

Page 5: ...iler flange to the boiler For heat exchangers with a diamond stud pattern one allen screw on the flange should be on the top slightly to the left of the 12 o clock stud The second screw should be on the right slightly above the 3 o clock position stud Tighten all the nuts equally Make sure that the allen screws are backed out to allow enough clearance Then insert the SU 4 gas burner into the boile...

Page 6: ...Capacity table for the correct sizes ALL PIPING MUST CONFORM WITH LOCAL CODES Use black steel pipe and malleable fittings do not use cast iron parts with a suitable pipe dope which is resistant to liquefied petroleum gases Piping should consist of 1 A shut off valve approximately 6 away from the unit 2 A 1 8 plugged NPT tapping for gas pressure measurement preferably on the manual shut off valve a...

Page 7: ...ne the setting of the low pressure gas switch LPS measure the manifold pressure MP inlet pressure IP and the pressure between the valve BV Initial setting of the High Gas Pressure Switch After the firing rate is determined refer to the charts Table 3 or Table 4 on page 12 of this manual Multiply the manifold pressure necessary by 1 5 and set the High Gas Pressure Switch to reflect that calculation...

Page 8: ...re by 2 and adding the pressure drop across the valve With the burner firing use an analyzer and slowly decrease the gas pressure into the valve to the new calculated low pressure cutoff point If the CO reaches 400 ppm before the newly calculated setting then at the point just before 400 ppm CO is reached is where the low gas pressure switch must be set Reset the incoming pressure back to the corr...

Page 9: ...a combustion analyzer to set the burner to between 8 and 9 5 CO2 for natural gas or between 10 0 and 11 5 for LP gas See page 13 14 of this manual for further details on burner operation By adjusting the manifold pressure it is possible to adjust the firing rate Refer to Tables 5 and 6 Note The pressure and head setting may vary for OEM packaged units When commissioning the burner make sure the ga...

Page 10: ...e 5 Firing Rates at Various Settings Natural Gas for SU 3 Manifold Pressure 1 0 Manifold Pressure 1 7 Manifold Pressure 2 7 Head Setting Air Shutter MBH Head Setting Air Shutter MBH Head Setting Air Shutter MBH 1 0 18 224 1 3 13 272 1 9 62 340 2 0 25 225 2 3 24 272 2 9 79 339 3 0 32 227 3 3 35 274 3 9 97 342 4 0 39 230 4 3 47 278 4 10 14 348 5 0 46 234 5 3 58 284 5 10 32 355 6 0 53 238 6 3 69 290 ...

Page 11: ...1 13 64 430 21 21 05 526 22 13 98 435 22 21 51 533 Electric Wiring These gas burners are manufactured for use with 120 volt 60 cycle single phase electric current The installation must comply and be grounded in accordance with the National Board of Fire Underwriters and National Electric Code ANSI NFPA No 70 1987 or the latest addition All applicable local codes should be followed as well Installa...

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Page 13: ...g lines do not power this Sometimes T T terminals are jumped with a wire nut for burners not set for motor off delay 3 Burner motor starts and pre purge begins 4 Burner housing pressurizes and proves air flow contacts closed Note if the contacts are closed before the motor starts blower motor runs continuously Diagnostic light flashes once every 3 seconds 5 At the end of pre purge ignition spark s...

Page 14: ... being used must always be closed When switching fuels the burner should be shut off by putting the selector switch in the center position The manual valves should then be moved so that the fuel that is not being used is closed and the fuel that is being used is opened The burner shall not switch fuels while firing Failure to follow this procedure could cause property damage personal injury or dea...

Page 15: ...the air as necessary See below Picture 6 Turning the Air Adjustment dial clockwise opens the air shutter and increases the air turning the air adjustment dial counter clockwise closes the air shutter and reduces the air Adjusting the Burner Using a combustion analyzer check the following readings If CO2 is greater than 9 5 O2 3 5 Open Air Shutter If CO2 is less than 8 8 O2 5 Close Air Shutter Carb...

Page 16: ...heck that the capacity of the meter can meet the demand of the burner and all other appliances running off the meter ____ 2 Check that the burner is on a direct pipe from the meter ____ 3 Measure the total length of all the pipe and count the number of elbows 1 90o elbow 3 ft of pipe Compare the total feet of pipe and the BTU demand using the chart on Page 5 to determine the size of the pipe requi...

Page 17: ...ire at steady state should be 0 02 W C to 0 50 W C Draft in the Breech at steady state refer to heat exchanger manual for details Natural Gas CO2 9 to 9 8 or O2 5 0 to 3 5 LP Gas CO2 10 5 to 11 5 or O2 5 0 to 3 5 Stack Temperature Gross o F 300o F minimum 550o F maximum Room Temperature o F Carbon Monoxide CO in PPM NOx in PPM If necessary Incoming Gas LP pressure W C minimum 5 Natural Gas manifol...

Page 18: ...153 4703 9 Outside Air Boot optional 83296 25 Retention head 1193 8501 9A Silencer optional 11909 60105 26 Union 113 9101 10 Air Regulation Plate 1186 7401 27 Gas Valve VR 8305 11 Air Damper 1186 7501 Power On light 115 2001 12 Air Regulation Adjustment screw 1184 8401 Fuel On Light 124 2001 13 Adjustment Screw Nozzle Line 1191 2901 Air light 124 2001 14 Ionization Cable 1186 5805 Adjustable Flang...

Page 19: ...flue of foreign materials 3 Pulsation during operation Burner is not correctly adjusted Readjust with combustion analyzer The burner is dirty Clean the burner Defective chimney Check and change if necessary with liners 4 Burner locks out Ionization current is too low Check current Minimum 0 8 micro amps Check position of ionization electrode and the condition of the cable 5 The CO content is too h...

Page 20: ...20 Flange SU 3 and SU 4 ...

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