Mighty Therm
Contents
1. capable of developing sufficient pressure to overcome the resistance of the boiler plus the entire circulating Zone Valves system at the designated GPM see Table 1 The temperature rise across the boiler should never exceed 40 NOTE Water entering boiler should be 105 minimum ANW 1 Variable Water Flow Systems ANW 54 Heating systems using zone valves zone pumps or 3 way valves can experience reduced water flow Y Compression Tank through the boiler This can result in an excessive water temperature rise and unstable boiler operation If E system water flow is variable it must not be allowed qos to fall below 30 of full flow The boiler must be Pump Max System Pump equipped with staged or modulated fire with the E Q temperature sensor installed in the outlet water State variable flow when ordering Laars recommends primary secondary pumping for all variable flow Q systems Primary secondary pumping is mandatory for variable flow systems where minimum flows are less than 30 of full flow conditions The boiler pump in a primary secondary system maintains constant flow through the boiler even though the system flow is variable In a primary secondary system the pressure drop of the boiler is not added to the system see Unit Figure 2 Primary Secondary System Figure 2 20 F 25 F 30 F 35 F Size I Size GPM H2. boilers must be installed on a non combustible floor Under no circumstances can boilers be installed on carpeting The National Fuel Code allows a boiler to be placed on a combustible surface when such an installation complies with the local codes This code specifies the surface under the boiler be protected with hollow masonry no less than 4 thick covered with sheet metal at least 20 Ga in thickness Such masonry Clearance Indoor Outdoor From Inches Inches Top 24 Water Connection Side 24 24 Opposite Side 24 24 Front 48 48 Rear 24 24 Vent 6 Figure 3 Boiler Chiller Installation Table 2 Minimum Clearances from Combusible Surfaces 6 LAARS Heating Systems must be laid with ends unsealed and joints matched in such a way as to provide a free circulation of air from side to side through the masonry see Figure 4 2B Installation of Indoor Boilers 2B 1 Combustion Air Supply 1 The boiler location must provide sufficient air supply for proper combustion and ventilation of the surrounding area as outlined in the latest edition of ANSI standard Z223 1 and or in Canada CAN1 B149 requirement and any local codes that may be applicable Inadequate combustion air supply may result in incomplete combustion and consequent sooting of the heat exchanger and unsafe operation of the boiler 2 In general in the U S these requirements specify that boiler rooms which represent con
3. 4 6 e e B T2006400 T2004000 T2004000 T2004000 T2004000 T2004000 T2007100 a 10 17 17 17 17 17 8 25 e e e e Le omg p pow p pl e e e E 1 M M MM MM LL e Lr a 5 45001 4000E Assembly 20052706 Bg B T2006500 T2004000 T2004000 T2004000 T2004000 T2004000 T2007000 17 17 17 17 17 8 75 2 e 1 4 G E 54 e 3 N N EL 40501 3600E 2 Assembly 20052705 s 5 5 8 e 72006400 72004000 72004000 72004000 72004000 72007000 17 17 17 17 12 75 e e g r pr ae e e e e ip H 35001 3200E Assembly 20052704 S 8 2 e e 2006400 2004000 T2004000 T2004000 T2006900 a 10 17 17 17 9 75 5 e e e pr S e SL Es H H 30501 2800E s Assembly 20052703 s NE e 72006500 72004000 72004000 72004000 72006800 17 17 17 7 38 17 17 14 38 wp s 8 mm ue gsm cam Fl e 24501 2200E 2000 2 Assembly 20052702 Assembly 20052701 S e e e pj T2006400 T2004000 T2004000 T2006700 iai T2006400 T2004000 T20066
4. for the audible sparking at the pilot burner to stop Under no circumstances should the trial for ignition exceed 15 seconds Because the electronic ignition controls are in series the control just upstream of the gas valves should be tested first refer to the electrical drawing supplied with the boiler Once the trial for ignition period has been checked the controls should be reset and the flame failure response time checked by following the procedure given for system 16 4 With the pilots lit initial activation of the main burners can be achieved by slowly opening the main manual valve The result should be a smooth lighting of the main burners Hi Limit Checkout After running the boiler for a long enough period to bring the water temperature within the range of the hi limit slowly back off the high limit setting until the boiler shuts off The main burners should reignite when the hi limit is turned back up to its original setting The high limit should now be reset and the boiler run until it shuts off automatically on high limit Now that all tests of the safety shutoff devices have been completed refer to Section 3B for the proper settings of temperature controls 3B To Start Up System See Section 3A for Initial Startup 1 Startup boiler a Be certain system pump is running b Lighting instructions are provided on the boiler rating plate and in the User s Manual and are as follows Turn off main electrical sw
5. 1 4 of the volume of the expansion tank open the tank drainer and drain to that level 11 Shut down the entire system and vent all radiation units and high points in the system piping as described in Step 4 12 Close make up water valve and check strainer in pressure reducing valve for sediment or debris from the make up water line Reopen make up water valve 13 Check gauge for correct water pressure and also check water level in the system If the height indicated above the boiler insures that water is at the highest point in the circulating loop then the system is ready for operation 14 Within three 3 days of start up recheck all air bleeders and expansion tank as described in Steps 4 and 8 SECTION 3 Operation 3A Initial Start Up Lighting Safe lighting and other performance criteria were met with the gas manifold and control assembly provided on the boiler when it underwent tests specified in the ANSI Z21 13 standard Before placing the boiler in operation the automatic safety shutoff devices must be checked Once the boiler is connected to the gas piping and after all of the requirements in Section 2 have been met follow this procedure 1 Before beginning the tests make sure the main manual gas valve and any other boiler firing valves are in the OFF position 2 Make sure the power switch on the boiler is in the position After placing the manual pilot valves in the open position and r
6. G P M flow recommended for water by 15 Increase the head loss requirement by 20 2E Gas Supply and Piping Review the following instructions before proceeding with the installation 1 Verify that the boiler is fitted for the proper type of gas by checking the rating plate Laars boilers are normally equipped to operate below a 2000 foot altitude Boilers equipped to operate at higher altitudes have appropriate stickers or tags attached 2 Use figures in Table 4 to provide adequate gas piping check local code for BTU capacity required 3 A trap drip leg must be provided ahead of the gas controls see Figure 7 Where required by code provide a second manual gas shutoff valve Do not remove manual valve furnished with the boiler LAARS Heating Systems 4 The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1 2 psig The boiler must be isolated from the gas supply piping system by closing its individual manual gas shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 2 psig 5 Provide gas supply pressure to the boiler as follows Natural Gas LPG Min inches water column 7 11 Max inches water column 9 14 Note The boiler and all other gas appliances sharing the boiler gas supply line must be firing at maximum capacity to
7. L GPM H L GPM H L GPM H L 200049 164 3 91 131 3 6 109 1 8 94 0 7 2 meme 164 10 5 131 7 4 109 4 9 94 3 0 24501P 22001P 201 5 9 161 3 9 134 3 8 115 2 3 2P 2P 201 16 4 161 10 2 134 7 7 115 5 7 30501P 28001P 250 9 3 200 5 9 167 4 5 143 3 8 2P 2P e 200 16 4 167 12 5 143 8 5 35001P 32001P 284 12 0 230 8 7 189 5 7 164 3 9 2P 1P E 189 16 8 164 10 5 40501 36001P 332 17 2 266 11 9 222 8 1 190 5 8 2P 2P 2 2 222 24 0 190 16 0 45001 40001 369 21 75 295 13 2 246 10 0 211 7 0 2 2 6 211 20 0 50001P 45001P 410 27 0 328 16 8 273 13 0 234 9 0 2P 2P HIGH NORMAL LOW Not recommended consult factory I Indoor E Outdoor GPM Water flow H H Pressure drop head loss through the boiler expressed in Ft of H 0 1P Single pass heat exchanger 2P Two pass heat exchanger Shaded area is the recommended flow and temperature rise Table 1 Water Flow Temperature Rise and Pressure Drop Mighty Therm Hydronic Boiler Page 5 1C 1 A Special Note About 3 Way Water Valves 3 way water valves 2 position or proportional are sometimes used to divert water around a boiler and control the temperature of water being supplied to the system Valves installed in this manner must be supplied with an end switch or some other suitable control to shut off the boiler when the flow is reduced to 3096 The boiler must be supplied with staged or modulated fire as indicated in Section 1C Variable Water Flow
8. Standard on sizes 3050 5000 AGA models Sizes 2000 amp 2450 use one pilot gas valve T Sizes 2000 2450 amp 3050 with on off or two stage fire use one main gas valve 2G Check boiler wiring and pump for correct voltage frequency and phase If the pump circuit is other than 115V check to see that the boiler is provided with an appropriate transformer Wire the boiler and pump exactly as shown in the wiring diagram supplied with the boiler The pump and boiler must be electrically interlocked so the boiler cannot come on unless the pump is running field installed electrical safety devices and all field installed devices draft switches relays timers outdoor temperature reset devices etc can be connected to the boiler wiring at points shown in the wiring diagram designated Field Interlock Piping of System to Boiler Be sure to provide gate valves at the inlet and outlet to the boiler so it can be readily isolated for service The pressure relief valve must be installed in the tapped opening provided in the boiler header with its outlet piped to a drain or floor sink Special attention must be given to relief valve settings in installations where the boiler is located on the ground floor of a tall building or where the operating temperature of the boiler is above 210 F In both instances the static pressure of the system is elevated and could cause the relief valve to leak and bring cons
9. Systems It is often possible to accomplish excellent water temperature control without 3 way valves through proper application of staged or modulated firing systems Consult the factory or local Laars representative for assistance with such systems 1C 2 System Pressure Requirements The Model HH boilers are designed to operate on closed pressurized systems A minimum of 12 psi should be maintained on the system where boiler supply water temperatures are 200 F or less If higher temperatures are required the minimum system pressure should be at least 15 psi above the water vapor pressure corresponding to the elevated water temperature The Model HH boilers are not suitable for open systems unless the supply water temperatures are kept below 180 F and a minimum of 5 psi static head is maintained at the boiler Suggested Wiring Diagram For Tempering System Water at Changeover from Heating to Cooling DPDT Manual or Automatic Clock Timer Change over Switch Auto resetting DPDT Set at Change over Set at 15 minute SPDT Temperature 115 24V Transformer 7 Valve Motors Chiller 4 2 Pos Chiller 3 Wire 24V From By pass je lt Boiler DK EE System To gt 7 gt System 3 Way Valve No 1 3 Way Valve No 2 Change over To By pass Heating and Cooling PUR Heater and hiller 1D
10. collector extension Install rear top half 5 Install front top half 6 Install front wire 26 mesh using angle 24 at top and strap 25 at bottom mesh to be inserted under angles of wind baffle stand offs Install rear mesh same as Step 18 Install front LH amp RH wind baffle stand off 23 Install rear LH amp RH wind baffle stand off 23 Install front and rear wind baffles 22 Install middle rear baffle stand off 11 Install middle rear baffle 10 Install wires control box parts onto control panel not shown Install control panel assembly using holes and bushings provided in RH extension panel for probes and wires not shown Install door panels 20 18 LAARS Heating Systems SECTION 7 Parts Description and Order Numbers Key Size Size Size Size Size Size Size No Description 2000 1 2450 1 3050 1 3500 4050 1 4500 1 5000 1 2200 2800 3200 3600 4000 4500 1 Base Weldment Assembly 20067201 20067202 20067203 20067204 20067205 20067206 20067207 2 Base Assembly 20011001 20011002 20011003 20011004 20011005 20011006 20011007 3 Center Heat Shield Assembly 20005701 20005702 20005703 20005704 20005705 20005706 20005707 2 2 3a Center Heat Shield Panel 20005601 20005602 20005603 20005604 20005605 20005606 20005607 2 2 4 End Tile Rail Support 20011101 20011101 20011101 20011101 20011101 20011101 20011101 Assembly left 4a End Tile Rail Support 20011102 20011
11. modulated fire and installed on a variable flow system set temperature controller at the designated system temperature Set the high limit switch 30 F above the supply temperature to the system 12 LAARS Heating Systems 3C To Turn Off Boiler 1 Turn off main electrical switch 2 Close all manual gas valves 3D To Shut Down System To shut down boiler turn off all manual gas valves and electrical disconnect switch Whenever danger of freezing exists shut off water supply and remove drain plug in bottom of front header cover and drain every part of system subject to freezing temperatures SECTION 4 Maintenance 1 Ifa strainer is employed in a pressure reducing valve or in the piping clean it every six 6 months 2 At start up and every six 6 months thereafter the pilot and main burner flame should be Observed for proper performance see Figure 9 and 10 see attached lighting and shutdown instructions for proper pilot flame pattern If flame has the appearance of sooting tips check for debris near orifices Call service technician 3 Inspect the venting system for obstruction leakage and corrosion at least once a year 4 Keep boiler area clear and free from combustible material gasoline and other flammable liquids and vapors Boiler surfaces are hot and could ignite combustible material Pilot P N W0034500 View On Arrow A Top View 5 Becertain all c
12. properly measure the inlet supply pressure Low gas pressure could be an indication of an undersize gas meter and or obstructed gas supply line 6 Thecorrect burner manifold gas pressure is stamped on the rating plate The regulator is pre set at the factory and normally requires no further adjustment 7 The gas manifold and control assembly was tested and conform to the safe lighting and other performance criteria specified in the latest editions of ANSI Z21 13 and CGA 3 3 Low Pressure Boiler Standard Distance from Gas Meter or Last Stage Regulator Gas Supply To Inlet Equipment pr Inlet 1 ee Fitting E Nipple ES Min Cap 77 Indoor Outdoor 0 100 100 200 200 300 Size Size Nat Pro Nat Pro Nat Pro 2000 2 2 3 2 3 3 2450 2200 3 2 3 2 3 2 3 3050 2800 3 2 3 3 3 3 3500 3200 3 2 3 2 3 4 3 2 4050 3600 3 2 3 4 3 2 4 3 2 4500 4000 3 2 3 4 3 2 5 4 5000 4500 4 3 4 3 2 5 4 NOTES These figures are based on 1 2 water column pressure drop Check supply pressure and local code requirements before proceeding with work Pipe fittings must be considered when determining gas pipe sizing Figure 7 Method of Installing a Tee Sediment Trap Mighty Therm Hydronic Boiler Page 9 8 Before operating the boiler the complete gas supply system and all connections must be tested for leaks using a
13. soap solution Do not use raw flame Caution Since some leak test solutions including soap and water may cause corrosion or stress cracking the piping must be rinsed with water after testing unless it has been determined that the leak test solution is noncorrosive Arrangement of gas train components for on off 2 stage and 4 stage firing are shown schematically in the Gas Piping Diagram see Figure 8 2F Electrical Wiring electrical diagrams are included with the packet provided with each unit A WARNING The boiler must be electrically grounded in accordance with the most recent edition of the National Electrical Code ANSI NFPA 70 and in Canada follow Canadian Electrical Code CSA C22 1 Do not rely on the gas or water piping to ground the metal parts of the boiler Many times plastic pipe or dielectric unions isolate the boiler electrically Service and maintenance personnel who work on or around the boiler may be standing on wet floors and could be electrocuted by a poorly grounded boiler Note Main Gas Valves Incorporate Gas Pressure Regulators Pilot Gas Valve Pilot Gas Filter HEN To Pilot Pilot Gas si Pressure Regulators i Pilot Gas Valve B 5 z To Pilot Manual Pilot Main Gas Gas Valve 1 pla Q To Main A Burners Manual Y Hi Pressure Gas Switch To Main valve Main Gas Burners Safety Solenoid Valve s
14. that can cut off the water flow through the boiler check to see that they are equipped with end switches which shut the boiler down when the water flow through the boiler is reduced by 70 from full flow Also be sure that manual bypasses are provided around two way zone valves where necessary in order to assure 1596 of full flow through the boiler at all times 4 Examine pump for clogged impeller 5 Water flow through the System may be impeded by air locks at high points Residual oil in system tends to collect at high points and clog automatic air vents Be sure that all high points are adequately vented A Static pressure in system exceeds setting of relief valve A Calculate height of water in System above boiler Install new valve with psi setting 2596 above required static System working pressure Do not exceed 160 psi B Expansion tank is waterlogged B Drain expansion tank then reopen it to the system Look for leaks in expansion tank or fittings Calculate required volume of expansion tank in relation to system to determine that tank is adequate C Valve between system and expansion tank is closed C Open valve so that pressure in system will be open to tank 6 Sootin flueways or in tubes or noxious fumes indicative of bad combustion Possible Cause What To Do A Combustion air supply to heater room is inadequate A Check air supply opening Look for debris in s
15. 00 Figure 15 Tile Assembly 22 LAARS Heating Systems Key Size Size Size Size Size Size Size No Description 2000 1 2450 3050 35001 4050 1 4500 1 5000 1 2200 2800 3200 3600 4000 4500 41 Pilot Lead Assembly Johnson 20035403 20035403 20035403 20035403 20035403 20035403 20035403 Standing Pilot Nat Propane 2 2 2 2 2 Pilot Lead Assembly Honeywell 20035404 20035404 20035404 20035404 20035404 20035404 20035404 Standing Pilot Nat Propane 2 2 2 2 2 Pilot Lead Assembly Johson 20035401 20035401 20035401 20035401 20035401 20035401 20035401 Pilot Nat 2 2 2 2 2 Pilot Lead Assembly Honeywell 20035402 20035402 20035402 20035402 20035402 20035402 20035402 Pilot Nat 2 2 2 2 2 42 Pilot Shield 20016400 20016400 20016400 20016400 20016400 20016400 20016400 2 2 2 2 2 43 Draft Hood Relief 20013801 20013801 20013801 20013801 20013802 20013803 20013804 Baffle Right indoor only 2 2 2 2 2 2 2 44 Draft Hood Relief 20013805 20013805 20013805 20013805 20013806 20013807 20013808 Baffle Right indoor only 2 2 2 2 2 2 2 45 Manual Valve V0001800 V0001800 V2013800 V2013800 V2013800 V2013900 V2013900 46 Safety Valve V0046800 V0046800 V0046900 V0046900 V0046900 V2000500 V2000500 47 Operating Valve V0051400 V0051400 V2001000 V0051400 V0051400 V0051400 V0051400 2 2 2 2 48 Manual Pilot Valve W0002100 W
16. 0002100 WO0002100 W0002100 W0002100 WO0002100 W0002100 2 2 2 2 2 49 a Pilot Valve I 1 D W0019300 W0019300 W0019300 W0019300 W0019300 W0019300 W0019300 not shown 2 2 2 2 2 49 b Pilot Relay Standing Pilot W003000 W003000 W003000 W003000 W003000 W003000 W003000 2 2 2 2 2 50 Pilot Burner Johnson W0034700 W0034700 W0034700 WO0034700 W0034700 W0034700 W0034700 Standing Pilot Nat 2 2 2 2 2 Pilot Burner Honeywell 00 4800 W0034800 W0034800 W0034800 W0034800 W0034800 W0034800 Standing Pilot Nat 2 2 2 2 2 51 Pilot Burner Johnson W0034600 W0034600 W0034600 W0034600 W0034600 W0034600 W0034600 Standing Pilot Propane 2 2 2 2 2 Pilot Burner Honeywell W0034400 W0034400 W0034400 W0034400 W0034400 W0034400 W0034400 Standing Pilot Propane 2 2 2 2 2 52 Pilot Burner Johnson W0034500 W0034500 W0034500 W0034500 W0034500 W0034500 W0034500 Pilot Nat 2 2 2 2 2 Pilot Burner Honeywell W0034300 W0034300 W0034300 W0034300 W0034300 W0034300 W0034300 IID Pilot Nat I Indoor E Outdoor 2 Quantity is one unless otherwise indicated 2 2 2 2 Mighty Therm Hydronic Boiler Page 23 LAARS Heating Systems Company A subsidiary of BRADFORD WHITE Corporation D Hydronics Industry Alliance 800 900 9276 Fax 800 559 1583 Customer Service Service Advisors 20 Industrial Way Rochester NH 03867 603
17. 102 20011102 20011102 20011102 20011102 20011102 Assembly right 5 Manifold Assy Single 20064301 20064201 20064401 20064501 20064600 20064700 20064800 Manifold Assy Split 20064302 20064202 20064402 20064502 20064600 20064700 20064800 Main Burner Assembly 20012600 20012600 20012600 20012600 20012600 20012600 20012600 Pilot Burner Bracket 2 2 2 2 2 6b Main Burner without L2005800 L2005800 L2005800 L2005800 L2005800 L2005800 L2005800 pilot bracket 22 27 32 37 44 48 54 7 Inner Shield 20002300 20002300 20002300 20002300 20002300 20002300 20002300 2 2 2 2 2 2 2 8 Tile Channel 20002600 20002600 20002600 20002600 20002600 20002600 20002600 2 2 2 2 2 2 2 9 Front Lower Closure 20004301 20004302 20004303 20004304 20004305 20004306 20004307 10 Rear Tile Rail Assembly 20011401 20011402 20011403 20011404 20011405 20011406 20011407 11 Front Tile Rail Assembly 20011301 20011302 20011303 20011304 20011305 20011306 20011307 12 Rear Closure Assembly 20012401 20012402 20012403 20012404 20012405 20012406 20012407 13 Heat Shield Support Bracket 20003201 20003202 20003203 20003204 20003205 20003206 20003207 2 2 2 2 2 2 2 14 Tile Heat Shield Assembly 20012101 20012102 20012103 20012104 20012105 20012106 20012107 2 2 2 2 2 2 2 15 Lower Panel Assembly 20011601 20011602 20011603 20011604 20011605 20011606 20011607 F amp R 2 2 2 2 2 2 2 16 Tile Cover 20005801
18. 20005802 20005803 20005804 20005805 20005806 20005807 2 2 2 2 2 2 2 17 Saddle Assembly End Tile 10533601 10533601 10533601 10533601 10533601 10533601 10533601 2 2 2 2 2 2 2 18 19 Tile Assembly See Tile Drawing on Page 20 20 Center Support Assembly 20004900 20004900 20004900 20004900 20004900 20004900 20004900 21 Heat Exchanger Assembly 20001301 20001302 20001303 20001304 20001305 20001306 20001307 21 Gasket Header 50095300 50095300 50095300 50095300 50095300 50095300 50095300 21b Water Barrier 10397500 10397500 10397500 10397500 10397500 10397500 10397500 21c Double Pass Header 10416200 10416200 10416200 10416200 10416200 10416200 10416200 I Indoor E Outdoor Quantity is one unless otherwise indicated 19 Mighty Therm Hydronic Boiler Asterisk indoor parts only Page 20 LAARS Heating Systems Key Size Size Size Size Size Size Size No Description 20001 2450 3050 1 3500 1 4050 1 4500 5000 2200 E 2800 E 3200 E 3600 E 4000 E 4500 E 21d Gasket Flange 50095600 80095600 50095600 50095600 50095600 50095600 50095600 2 2 2 2 2 2 2 21 Flange 10417400 10417400 10417400 10417400 10417400 10417400 10417400 2 2 2 2 2 2 2 21f Cap Screw Hex F0024500 F0024500 0024500 F0024500 0024500 0024500 F0024500 1 2 13UNC x 2 8 8 8 8 8 8 8 21g Return Header 10416100 10416100 10416100 10416100 10416100 10416100 10416100 21h Gaske
19. 335 6300 Fax 603 335 3355 1869 Sismet Road Mississauga Ontario Canada LAW 1W8 905 238 0100 Fax 905 366 0130 www Laars com Litho in U S A Laars Heating Systems 0805 Document 1065D H0147600D
20. Installation and Operation Instructions Document 1065D Installation and Operation Instructions for Mighty Therm Model HH Sizes 2000 5000 Hydronic Boilers FOR YOUR SAFETY This product must be installed and serviced by a professional service technician qualified in hot water heater installation and maintenance Improper installation and or operation could create carbon monoxide gas in flue gases which could cause serious injury property damage or death Improper installation and or operation will void the warranty AWARNING If the information in this manual is not followed exactly a fire or explosion may result causing property damage personal injury or loss of life Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a nearby phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service must be performed by a qualified installer service agency or gas s
21. Warning Regarding Chilled Water Systems When a boiler is connected to an air conditioning system where the same water is used for heating and cooling chilled water must be prevented from entering the boiler When changing such a system from cooling to heating the chilled water should be allowed to circulate through the building after the chiller has been turned off long enough for the water to warm up to at least 70 F before the water is allowed to flow into the boiler It is equally important to prevent hot water from entering the chiller The system shown in Figure 3 is suggested to make sure that the system water is neither too hot nor too cold when a changeover from heating to cooling or vice versa takes place When a boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air circulation the boiler piping system shall be equipped with a flow control valve or other automatic means to prevent gravity circulation of chilled water through the boiler Chilled water in the boiler will create condensate on the boiler tubes which will drip on the burners and may extinguish the pilot Boilers installed in violation of either of the above requirements may void the warranty SECTION 2 Installation 2A Boiler Placement The boiler must be placed to provide clearances on all sides for maintenance and inspection There must also be minimum distances maintained from combustible surfaces
22. a 18 2G Piping of System to Boiler 9 2H Filling Fully Connected System 10 SECTION 3 Operation 3A Initial Start Up annen 10 3B To Start Up 11 Mighty Therm Hydronic Boiler Page 3 SECTION 1 General Information A IMPORTANT WARNING The Model HH hydronic boiler must be installed in accordance with the procedures outlined in this manual Warranty does not apply to boilers not installed or operated in accordance with these procedures Consult local building and safety codes before proceeding with work The installation must conform to the requirements of the authority having jurisdiction or in the absence of such requirements to the latest edition of the National Fuel Gas Code ANSI Z223 1 and or in Canada CAN1 B149 requirement When required by the authority having jurisdiction the installation must conform to American Society of Mechanical Engineers safety code for controls and safety devices for automatically fired boilers No CSD 1 and in Canada CGA3 3 Any modification to the boiler its gas controls gas orifices wiring or draft diverter may void the Laars warranty If field conditions require such modifications consult Factory 1A Introduction This manual provides information for the installation and operation of Laars boilers It is strongly recommended that all application and ins
23. alve every time the boiler fires and permits raw water to enter the system every time it cools down Drain expansion tank E Boiler not fitted for the fuel being supplied E See nameplate for correct fuel F Boiler installed at high altitude without proper derating F Installations at altitudes in excess of 2000 ft above sea level are subject to jurisdiction of the local inspection authorities G Water entering boiler is 105 F G Add balancing valves if needed to raise entering temperature Mighty Therm Hydronic Boiler Page 15 7 Water dripping in firebox Outdoor Kit Parts List see Figure 13 Possible Cause What To Do Key No Part No EN heka D 20017100 conditioning system chilled programmed bypass valve in EEE OEE jae 20016900 water may be flowing either the system for change over eet eb ee EE 20015101 by gravity p obi QUU i TEM etn 20015102 through boiler and B 20016700 boiler tubes ise id 20017200 tt IE 20017300 Tube in heat exchanger has tube failure always caused 11 20017700 ruptured py M LLL LLL rarseuledonmalfonimihettube a E ER SE 20016500 or e ate ined het Eden RD iE 20016600 b inadequate water flow DIVIN AGE AL iin DM 20016300 trou
24. atural draft operation and must not be connected into any portion of a mechanical draft system under positive pressure The flue outlet must be connected to a clear unobstructed vent of adequate capacity terminating above the highest point of the building with an approved vent cap The venting system should be installed according to the latest edition of ANSI Z223 1 and any local codes having jurisdiction and or in Canada follow CANI B149 standard IMPORTANT NOTE Do not use sheet metal screws at the snap lock joints of Type B gas vents 2 Do not weld or fasten the vent pipe to the boiler draft hood The weight of the stack must not rest on the boiler The draft hood and boiler top must be easily removable for normal boiler service and inspection Avoid long horizontal runs of the vent pipe and too many 90 elbows reductions and restrictions Horizontal runs should have at least a 4 rise per foot in the direction of flow A vent connector shall be supported for the design and weight of the material employed to maintain clearances and prevent physical damage and separation of joints Avoid terminating boiler vents near air conditioning or air supply fans The fans can pick up exhaust flue products from the boiler and return them inside the building creating a possible health hazard A minimum of 4 feet horizontal distance must be maintained from electric meters gas meters and relief equipment Line Voltage This Por
25. creen or louvre which covers combustion air opening or for material blocking the opening B Low or no system pressure B Check for inoperative water makeup valve or pump Also clean strainer in pressure reducing valve which furnishes makeup water Look for closed valve in makeup water line or a leak in the system B Stack or vent is blocked or restrictive B Look for blocked stack and excessive number of elbows in stack or excessive length of horizontal runs C Clogged Y strainer C Remove strainer element and clean screen C Severe down draft is causing spillage of flue products into room Check for 1 proper vent cap on stack 2 adequate height of stack above roof 3 equipment exhausting air from inside of building and 4 setting on the barometric damper if applicable and 5 proper installation of draft diverter D Debris from system piping is blocking tubes D Remove header covers Examine all tubes and waterways Use new gaskets when reassembling Clean out tubes D Gas pressure to burners is excessive D Check gas pressure with manometer and adjust with heater firing at full rate E Scale has formed in tubes E This is always caused by the inflow of raw water into the system Check for leak in System especially at pump packing Check for water logged expansion tank This condition will cause water to discharge through the relief v
26. e dampen the soot deposits with a wet brush or fine water spray before servicing or cleaning the heat exchanger Front View of Boiler Observation Hole Burner a gay iu Figure 10 Pilot Location Figure 11 Periodic Flame Observation Mighty Therm Hydronic Boiler Page 13 With a wire brush remove soot and loose scale from the heat exchanger Do not use water or compressed air for cleaning Clean fallen debris from the bottom of the boiler Check that burner ports are clear and pilot assembly is free of debris d Reassemble in reverse order Be sure to replace the heat exchanger baffles 7 The gas and electric controls installed on the boilers are designed for both dependable operation and long life But the safety of this equipment depends completely on their proper functioning It is strongly recommended that the basic items be checked by a competent service technician every year and replaced when necessary The basic controls are a Water temperature controls b Pilot safety system c Automatic electric gas valve s d Flow sensing safety device when used 8 Low water cutoffs should be inspected every six 6 months including flushing or float types NOTE Warranty does not cover any damage caused by lack of required maintenance or improper operating practices 9 Both modulating and staged valves are adjusted at the factory for minimum permis
27. e boiler unless a positive draft has been established see Figure 5 2C Installation of Outdoor Boilers ACaution Outdoor installations are not recommended in areas where the danger of snow blockage exists 1 Locate the boiler to provide the minimum clearances as listed in Section 2A Placement of Boiler 2 Do not locate the boiler in an enclosure or wall recess Avoid location where wind deflection off structures might cause down draft When such Figure 6 Incorrect Outdoor Installation of Boiler 8 wind conditions are possible locate the boiler at least three 3 feet from the structures 3 Never install the boiler under any kind of roof overhang Do not locate the boiler below or adjacent to any doors windows louvers grills etc which communicate in any way with an inhabited area of a building Even though such communication might be through another structure such as a garage or utility room see Figure 6 2D Freeze Protection Boiler installations are not recommended in areas where the danger of freezing exists unless proper precautions are made for freeze protection Maintaining a mixture of 50 water and 50 ethylene glycol is the preferred method of freeze protection for hydronic systems This mixture will protect the boiler to temperatures of about 35 F To get the desired temperature rise across the boiler when this mixture is used increase the
28. esetting all safety devices high limit pressure switch low water cutoff etc pilots can be lit following the procedure located on the boiler rating plate Mighty Therm Hydronic Boiler Page 11 3 the pilots are lit and have been established for five minutes the flame failure response time should be checked as follows System 16 Electronically supervised standing pilot system standard on propane gas Extinguish the pilot flame by placing the manual pilot valve in the closed position and at the same time begin recording the time it takes for the output signal from the electronic ignition control to be interrupted Refer to the electrical drawing supplied with the boiler for wiring details The signal interruption can be detected either with a test light or a voltmeter Because the ignition controls are in series the control just upstream of the gas valves should be tested first Under no circumstances should the response time exceed 5 seconds System 18 Intermittent ignition supplied only for natural gas With this system pilots are automatically lit when the thermostat calls for heat The pilots are permitted a trial period for ignition then the system is locked out if it fails to light To retry ignition power to the boiler must be momentarily interrupted After the pilot is initially lit the trial for ignition time should be checked by turning off pilot gas and at the same time monitoring the time it takes
29. fined spaces should be provided with two permanent air supply openings communicating directly through the wall to outside air one within 12 inches of the ceiling the other within 12 inches of the floor Each opening should have a minimum free area of one square inch per 4 000 BTUs H input rating of all appliances in the enclosed area See Table 3 for recommended air supply for each model An improperly ventilated equipment room can get excessively hot and cause accelerated deterioration of controls and electrical components Base Must Extend Out Min 12 On All Sides Of Heater Frame Metal Plate 20 Ga Min Under Entire Heater Concrete Blocks Or Tile Min 7 High With Min Air Openings Blocks must provide solid base and be braced so they cannot slip out of place Air openings in blocks must be arranged to provide unobstructed opening through entire width or length of base NOTE In Canada Table 3 does not apply consult local building and safety codes or in the absence of such requirements follow CGA requirement and or CAN1 B149 standard 3 Exhaust Fans or Vents Any equipment which exhausts air from the boiler room can deplete the combustion air supply or reverse the natural draft action of the venting system This could cause flue products to accumulate in the boiler room Additional air must be supplied to compensate for such exhaust The information in Table 3 is not applicable in installation
30. gh thie goller beelen 20014301 nabeeld ame 20014302 16 5 cto nennen denna eu 20015200 17A Left Front Baffle Single Inlet Manifold 20022200 17B Right Front Baffle Single Inlet Manifold 20022300 SECTION 6 17C Left Front Baffle Split Inlet Manifold 20022000 Conversion of Series HH Boilers 17D Right Front Baffle Split Inlet Manifold 20022100 from Indoor to Outdoor Model 20014601 20014602 19 ine ut ae Gu ebd 20016100 Please read the following instructions with 20018000 Figure 12 i 2 eener N ee 20016200 Figure 13 shows the conversion completed 22 20017200 Please follow the instructions in their numerical 227777 der fail do thi ill bl 29 xcd aal me enemies 20017600 E ra Ure todo uis Wal Cause prop ems on E HP TR 20018200 DA CHEN ICE DD de 20018300 1 Remove top panel 1 see Figure 12 QD M trees pao m ure rd MM 20018600 2 DEP 20015001 2 Remove front and rear upper panels 2 20015002 see Figure 12 pe i A LL P 20016800 3 Remove front and rear wings LH amp RH 3 see Figure 12 4 Remove diverter assembly 4 see Figure 12 5 Remove outer screw from upper end panel at junction with lower end panel D 4 2 lt gt SD Figure 12 Removal of Indoor Parts LAARS Heating S
31. iderable raw water into the system Where no special setting of the relief valve is ordered the factory will furnish a 125 psi setting Never reduce the relief valve opening If necessary install the relief valve in a Tee immediately past the boiler outlet A boiler installed above radiation level must be provided with a low water cutoff device either as part of the boiler or at the time of boiler installation see Figure 9 Install manual and or automatic bleeding devices at high points in the system to eliminate air Install a correctly sized expansion or compression tank with suitable air charger and tank drainer as appropriate The weight of all water and gas piping should be supported by suitable hangers or floor stands Check piping diagrams with local applicable plumbing heating and building safety codes 10 LAARS Heating Systems 2H Filling Fully Connected System 1 Close all bleeding devices and open make up water valve Allow system to fill slowly 2 If make up water pump is employed adjust pressure switch on pumping system to provide a minimum of 12 psi at the highest point in the heating loop 3 Ifa water pressure regulator is provided on the make up water line adjust the pressure regulator to provide at least 12 psi at the highest point in the heating loop 4 Open bleeding devices on all radiation units at the high points in the piping throughout the system unless automatic air bleeders a
32. itch 2 Turn off all manual gas valves and wait five minutes 3 Setaquastat or thermostat to lowest setting 4 Slowly turn manual gas valve to ON 5 Reset all safety valves pressure switch and manual reset high limit 6 Open manual pilot valve Turn on main electrical switch 7 Set temperature controller to desired temperature Pilot will light automatically to ignite main burners whenever the thermostat calls for heat 8 The low firing rate setting must be equal to or greater than the specified minimum input rating as shown on the appliance rating plate For example size 2450 has a specified minimum input of 735 000 BTUs hr The unit s input rate must not be below this value refer to rating plate Laars boilers use gas valves which are factory set to provide an input on low fire that meet or exceed the specified minimum 2 Set temperature controls Boilers on constant flow will have the temperature controller bulb located in the boiler inlet and the high limit sensing bulb in the boiler outlet Boilers on variable flow will have both the temperature control sensing bulb and the high limit sensing bulb located in the boiler outlet When boiler is installed on a constant water flow system set temperature controller at the designed system supply temperature less the temperature drop in the system Set the high limit switch 30 F above the supply temperature to the system When boiler is equipped with staged or
33. lue Diverter Assembly 20012201 20012202 20012203 20012204 20012205 20012206 20012207 indoor only 32 Upper Wing 20006301 20006301 20006301 20006301 20006301 20006301 20006301 F amp R Left indoor only 2 2 2 2 2 2 2 33 Upper Wing 20006302 20006302 20006302 20006302 20006302 20006302 20006302 amp R Right indoor only 2 2 2 2 2 2 2 34 Panel Assembly 20012301 20012302 20012303 20012304 20012305 20012306 20012307 indoor only 35 Flue End Assembly 20012000 20012000 20012000 20012000 20012000 20012000 20012000 2 2 2 2 2 2 2 36 Upper End Assembly 20011900 20011900 20011900 20011900 20011900 20011900 20011900 2 2 2 2 2 2 2 37 Lower End Panel Assembly 20011800 20011800 20011800 20011800 20011800 20011800 20011800 2 2 2 2 2 2 2 38 Control Mounting Panel 20013700 20013700 20013700 20013700 20013700 20013700 20013700 39 Control Cover Front 20018700 20018700 20018700 20018700 20018700 20018700 20018700 40 Control Box Cover Top 20011200 20011200 20011200 20011200 20011200 20011200 20011200 I Indoor E Outdoor Quantity is one unless otherwise indicated Mighty Therm Hydronic Boiler Page 21 17 17 17 17 17 17 13 75 Le w pom pow p r pow pow e iL L L 3 e N N LT LT 50001 4500E Assembly 20052707 Ii
34. ombustion air and ventilation openings are unobstructed 6 Check for fouling on the external surfaces of the heat exchanger every six months NOTE After installation and first start up check the heat exchanger for fouling after the following periods of operation 24 hours 7 days 30 days 90 days and once every six months thereafter Fouling on the external surfaces of the heat exchanger is caused by incomplete combustion and is a sign of combustion air and or venting problems As soon as any fouling is observed the cause of the fouling should be corrected see Section 5 Troubleshooting The heat exchanger can be checked with a flashlight by locating a mirror under the burners n alternate method is to remove the venting and top panel as necessary to inspect from above Also check the vent system for defects at the same time a If cleaning is required shut off all electrical and gas supply to the boiler b To expose the heat exchanger Remove top panel covers located at the base of the front and rear flue collector panels Remove all but the top screws on each side of the front and rear flue collector panels The panels can be swung outward and propped up to reveal the heat exchanger Remove all heat exchanger baffles Remove all burners ACaution Black carbon or green soot on a dirty heat exchanger can under certain conditions be ignited by a random spark or open flame To prevent this unlikely occurrenc
35. re provided at such points 5 system circulating pump for a minimum of 30 minutes with the boiler shut off 6 Open all strainers in the circulating system and check for debris 7 Recheck all air bleeders as described in Step 4 Air Changer and Tank Drainer Make up Water Supply an Compression Tank Check _ Valve D Meth To Drain nod 2 Pressure 7 Reducing Valve Ue Method 1 2 Blow Down Valve ef Drain Strainer Pump Thermometer Temperature and Pressure Gauge Notes Select Method 1 or 2 when using Low Water Cutoff accessory 1 Under Method 1 the Low Water Cutoff is furnished by Laars and shipped as a separate item for field installation 2 Under Method 2 Electronic Low Water Cutoff is installed wired and tested on boiler in Laars factory 3 Preferred location of system pump is shown Compression tank must always be on suction side of pump Figure 9 Boiler Piping 8 Check liquid level in expansion tank With the system full of water and under normal operating pressure the level of water in the expansion tank should not exceed 4 of the total with the balance filled with air 9 Start up boiler according to procedure described in Section 3A Operate the entire system including the pump boiler and radiation units for one 1 hour 10 Recheck the water level in the expansion tank If the water level exceeds
36. s where exhaust fans or blowers of any type are used Such installations must be designed by qualified engineers 4 If a blower or fan is used to supply air to the boiler room the installer should make sure it does not create drafts which could cause nuisance shutdowns of the pilot If a blower is necessary to provide adequate combustion air to the boiler a suitable switch or equivalent must be wired into the boiler control circuit to prevent the boiler from firing unless the blower is operating 5 The boiler must be completely isolated and protected from any source of corrosive chemical fumes such as emitted by trichlorethylene perchlorethylene chlorine etc Indoor Each Opening Size Square Inches 2000 500 2450 613 3050 763 3500 875 4050 1013 4500 1125 5000 1250 Net Free Area in Square Inches Area indicated is for one of two openings one at floor level and one at the ceiling so the total net free area would be double the figures indicated For all other conditions refer to latest edition of ANSI Bulletin Z223 1 NOTE Check with louver manufacturers for Net Free Area of louvers Correct for screen resistance to the Net Free Area if a screen is installed Check all local codes applicable to combustion air Figure 4 Non combustible Base Table 3 Minimum Recomended Air Supply To Boiler Room Mighty Therm Hydronic Boiler 2B 2 Venting Laars boilers have built in draft diverters for n
37. sible rates and should not be readjusted SECTION 5 Troubleshooting and Analysis of Service Problems 1 For proper service and problem diagnosis of the boiler and boiler system the following tools are required a Gas pressure test kit with range from zero to 14 W C Either a slack tub manometer or an accurate gas pressure gauge is acceptable with proper adaptors which will connect to the available fittings in the line and on the gas valve b Electric meter s with the following ranges 0 to 500 volts A C 0 to 1000 ohms continuity c Millivolt meter with the following ranges 0 to 50 millivolts 0 to 500 millivolts 0 to 1000 millivolts d Tubecleaning kit consisting of reamer stainless steel brush speed handle and handle extensions e Boiler thermometer with 1 2 NPT well 100 240 F 2 In addition the boiler should be equipped with a system pressure gauge and a thermometer with proper ranges for boiler operation 3 Boiler will not fire Possible Cause What To Do A Electric power is off A Check to see that main power switch is ON Use testing device to trace power to heater junction box B Operating or safety control B Turn off power Use continuity has opened circuit to across terminals of each electric gas valve operating and safety control switch up to the electric gas valve Replace defective control C Pilot flame is out Relight pilot per instruc
38. t Header 50095300 50095300 50095300 50095300 50095300 50095300 50095300 21 Cap Screw Hex Hd F0013300 0013300 F0013300 F0013300 0013300 F0013300 0013300 1 2 13UNC x 1 1 2 36 36 36 36 36 36 36 21k Washer 1 2 F0010300 F0010300 0010300 0010300 0010300 0010300 F0010300 36 36 36 36 36 36 36 22 Lock Washer 3 8 F0010800 0010800 0010800 0010800 0010800 0010800 F0010800 2 2 2 2 2 2 2 23 Washer 3 8 F0011100 F0011100 0011100 0011100 0011100 0011100 0011100 2 2 2 2 2 2 2 24 Cap Screw F0015900 0015900 0015900 0015900 0015900 0015900 0015900 3 8 16UNC x 3 4 2 2 2 2 2 2 2 25 Heat Exchanger Baffle Assembly 20010900 20010900 20010900 20010900 20010900 20010900 20010900 68 68 68 102 102 102 102 26 Heat Exchanger Baffle F amp R 10534310 10534311 10534312 10534313 10534314 10534315 10534316 2 2 2 2 2 2 2 27 Front amp Rear Closure 20006401 20006402 20006403 20006404 20006405 20006406 20006407 2 2 2 2 2 2 2 28 Inside Baffle Assembly Indoor 20012501 20012502 20012503 20012504 20012505 20012506 20012507 Outdoor N A 20012509 20012510 20012511 20012512 20012513 20012514 29 Flue Panel Assembly 20011501 20011502 20011503 20011504 20011505 20011506 20011507 F amp R 2 2 2 2 2 2 2 30 Upper Panel 20011701 20011702 20011703 20011704 20011705 20011706 20011707 F amp R indoor only 2 2 2 2 2 2 2 31 F
39. tallation procedures be reviewed completely before proceeding with the installation Consult the factory or local factory representative with any problems or questions regarding this equipment Experience has shown that most operating problems are caused by improper installation Model HH boilers are offered in two configurations An indoor version and an outdoor version The indoor version is convertible for outdoor use with the installation of a conversion Kit as described in Section 6 of this manual The two configurations are shown in Figure 1 Some accessory items are shipped in separate packages Verify receipt of all packages listed on the packing slip Inspect everything for damage immediately upon delivery and advise the carrier of any shortages or damage Any such claims should be filed with the carrier The carrier not the shipper is responsible for shortages and damage to the shipment whether visible or concealed Indoor temperature controller is factory installed in the outlet water Outdoor When boiler is ordered with stage or modulated control and sales order states it is to be used on a variable flow system the Figure 1 Boiler Configuration 4 LAARS Heating Systems 1B Flow Requirements All low volume hydronic boilers must have continuous flow through the heat exchanger when firing for proper operation The system pump must be Convectors Baseboards or Fan Coils
40. tion Factory Wired 115 24V Electric Gas Valve On Heater Draft Fan 24V Motor Motor Relay Figure 7 Method of Installing a Tee Sediment Trap Page 7 5 Always use double wall or insulated vent pipe Type B or equivalent In cold weather uninsulated outside vents can chill the rising flue products blocking the natural draft action of the venting system This can create a health hazard by spilling flue products into the boiler room 6 Avoid oversize vent piping or extremely long runs of the pipe which may cause excessive cooling and condensation Rule of Thumb The total length of the vent including the connector and any offset should not exceed 15 feet for every inch of vent diameter Longer total lengths shown in venting tables are based on maximum capacity not condensation factors 7 the installation of a draft fan is necessary in the venting system to which a Laars boiler is to be connected the installation should be engineered by competent personnel following good engineering practices The draft fan supplier should be consulted for correct size The installation should be in accordance with the latest edition of ANSI Z223 1 and any local codes having jurisdiction in Canada follow 149 standard When a draft fan is installed a suitable draft switch must be used and wired into the boiler control circuit at terminal designated Field Interlock to prevent firing of th
41. tion D Manual reset device has D Follow instructions for start tripped up Reset pilot safety and all manual reset safety switches and reset manual safety gas valve E No gas pressure to burners E Trace gas line to service shutoff cock If service cock is open trace gas line to meter If no pressure is present at meter call for public utility service If gas is present in boiler inlet check pressures in following sequence 1 downstream from pressure regulator 2 downstream from electric gas valve Replace or adjust as necessary F Electric gas valve operator is F Disconnect wiring harness at burned out or shortened gas valve terminals Check continuity to actuator coil If open circuit or short is indicated replace coil or operator Page 14 LAARS Heating Systems 4 Boiler is pounding Knocking or emitting steam 5 Pressure relief valves leaking intermittently or from relief valves steadily Possible Cause What To Do Possible Cause What To Do A Low or no water flow A This condition is usually caused by lack of adequate water flow through boiler Check the following 1 Is the heater wired into the pump circuit so that the boiler cannot fire unless the pump is running 2 Check to see that all valves in system are open to be sure that water can circulate through the boiler and the system 3 If the system has automatic water valves 2 way or 3 way
42. upplier LAARS Heating Systems Company A subsidiary of BRADFORD WHITE Corporation H0147600D 2 LAARS Heating Systems TABLE OF CONTENTS SECTION 1 3C To Turn Off 12 General Information 3D To Shut Down System 12 1 Introd ction ite terze 3 1B Flow Requirements 4 SECTION 4 1C Variable Water Flow Systems 4 Maintenance 1C 1 A Special Note About 3 Way 12 Water 5 1C 2 System Pressure Requirements 5 SECTION 5 10 NEC Chilled Troubleshooting and Analysis of ater Service Problems SECTION 2 ere rr errr errr re rere rere ere ere ere ere rr err er re ere ere rr ery 13 Installation SECTION 6 2A Boiler Placement 5 f VW f Ind 2B Installation of Indoor Boilers 6 onversion rom indoor 2B 1 Combustion Air 6 to Outdoor Models 2B 2 Veniing thes ee Wo g diuupstaiiciuunniiinueniniuq rues rines 15 2C Installation of Outdoor Heater 7 2D Freeze Protection 8 SECTION 7 2E Gas Supply and 8 Parts Description and Order Numbers 2F Electrical Wiring eee mo TIU ced bons ut ao
43. ystems Page 16 N 23 22 Figure 13 Outdoor Parts Identification Mighty Therm Hydronic Boiler tl Remove outer screw from upper end panel at junction with lower end panel Remove and disconnect all probes and wires going to castings and gas train Remove control box assembly front of boiler not shown Section 2 See Figure 13 10 11 Install front LH amp RH extension panels flush with top of upper end panel 18 Install rear LH amp RH extension panels flush with top of upper end panel 15 pick up holes provided into LB upper and lower end panels Install front bottom panel 21 Install rear bottom panel 14 Install front inner baffles 2 4 from ends 17 Install rear inner baffle 1 2 from ends 16 Install front LH amp RH upper spacers 27 Install rear LH amp RH upper spacers 7 Install front flue collector extension screw onto flange of lower flue collector only 28 Install rear flue collector extension screw onto flange of lower flue collector only 8 Install rear upper panel and remaining screws from flue collector extension 12 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Page 17 Install middle rear panel 13 Install front panel making sure opening for removable panel is square 19 Install front stiffener size 2450 and up Install remaining screws from flue
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