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IF YOU ARE NOT QUALIFIED to install or service boilers, do not install or service this one. Using sheetmetal screws, attach the vent connector between the vent damper and the vertical chimney (Figure 4-b). Do not exceed the maximum vent connector length in Table 4.1. Failure to do so may cause poor combustion, noise, injury, or death. Remove boiler door, locate gas valve and remove plastic shipping plug. Please note that these keys look similar to the keys on the IQ Option Panel but are in a different orientation, and they perform different functions. All boiler settings, status and error codes are displayed in full text.Lighting the boiler when gas is leaking may cause explosion or fire. Follow the checklist below: Verify that the venting, water piping, gas piping, and electrical systems are properly installed and checked. Check operation of airflow sensing switches. Check for water leaks on the boiler or water pooling around boiler. Manually operate the relief valve. If the water is grey or black, there is excessive oxygen in the system. The display on the IQ Boiler control should be the first place to check.Use the following table along with this error number to determine the problem and possible. To investigate the status of option card C1: Press the “I”. If the boiler is a Direct Vent boiler and exchanges all combustion air and combustion products directly with the outdoors, there are no special requirements for providing combustion, ventilation, and dilution air. INSPECT EXISTING CHIMNEY for obstructions and deterioration and repair or line the chimney prior to placing the boiler in service. UNLINED MASONRY CONSTRUCTION is prohibited for use as a chimney. FIREPLACES AND FAN-ASSISTED GAS APPLIANCES must not be vented into the same chimney space as this boiler. Ensure that gas piping, fittings, and gas. http://xn----ctbefsaoezcssn.xn--p1ai/userfiles/craftsman-eager-1-6_75-manual.xml

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Training and experience is required to design and install a piping system that will protect the boiler and provide many years of comfort to the building occupants. Be sure to protect the boiler from the following. They do not substitute for proper design, evaluation, and installation by a trained and qualified installer using the proper tools, techniques, and design expertise. Remove air from system when filling.Do not reduce more than 0.3” w.c. Instead, contact Burnham for an orifice replacement kit. If input is below 98 of Rating Label input, increase manifold gas pressure no more than 0.3 inches w.c. Check for gas leaks in all piping joints,. For oil boilers, also use a smoke tester with smoke test paper. Operate the boiler at its rated (high fire) input. With the analyzer, check the CO CO and temperature of the flue gases exiting the boiler. IQ Boiler Control: The heart of Burnham’s IQ Control System is the IQ Boiler Control. The IQ Boiler Control replaces the traditional separate ignition control, primary boiler aquastat, as well as the fan and circulator relays. LWCO IQ Option Cards use patented signal processing to identify when the probe signal levels have decreased due to fouling, permitting extended operation for probe impedances up to 40K Ohms. Our website will notify you if an item is not in stock or if there are any issues. Stay safe and we appreciate your business. Thanks Please use the menus provided to the left to navigate this store or call Boston Heating Supply toll free 866-914-9802. Designed as an optimal replacement boiler for millions of homes with existing chimneys, the ES2 achieves an 85 AFUE. At the heart of the ES2 is one of the most advanced cast iron heat exchangers in the industry, and a well-insulated heavy-duty steel base for longevity. Even the ES2’s control system is class leading. http://ahkjt.com/upfile/craftsman-eager-1-6_75-repair-manual.xml

The IQ Boiler Control System allows the ES2 to be easily equipped with an optional energy saving control package that can achieve up to a 15-20 reduction in fuel consumption according to most studies. Page 2 WARNINGS for the HOMEOWNERRatingsFigure S-1: Minimum Clearances to Combustibles and Closet DimensionsTable 4.1: ES2 Vent Connector - Horizontal Length Restrictions (ft)Using IQ Boiler Control Display Viewing the Operating Mode OptionsUsing the Optional LCD Display Kit. The LCD Display is an easy to use. Page 16: Perform startup checks and adjustments 10. Perform Startup Checks and AdjustmentsCERAMIC FIBER, a possible. Page 18: Troubleshooting Troubleshooting. When a problem occurs with the boiler operation, the Burnham IQ Control System easily provides specific,Page 19 Troubleshooting (continued). Page 20 Troubleshooting (continued). Page 21: Repair Parts List Repair Parts LISTNo. ES23 ES24 ES25 ES26 ES27 ES28 ES29No. ES23 ES24 ES25 ES26 ES27 ES28 ES29No. ES23 ES24 ES25 ES26 ES27 ES28 ES29Figure IW-1: Wiring DiagramFigure IW-3: Single Zone System with Domestic Hot Water TankPage 30 Internal Wiring (continued)Page 31 Internal Wiring (continued)Failure to do so may cause products of.USE ATMOSPHERIC VENTING only with DO NOT REDUCE. Page 35 THIS PAGE INTENTIONALLY LEFT BLANKAlso add a low-waterFill entire heating system with water and vent air. Natural Gas Boilers:IQ Option Cards:IQ Display Kit. The LCD Display is an easy to use touch. System Parts List. Factory Mounted Components. Our Live Chat hours are:If you have problems accessing your account, please contact us at 1-888-757-4774 and we'll help you out. Add item to cart for lowest price.Manufacturer's warranty still applies.Join our mailing list to receive exclusive offers and coupons. When seeking information on boiler, provide Boiler Model Number and Serial Number as shown on Rating Label. Boiler Model Number BInsufficient air may cause the boiler to manual. http://dev.pb-adcon.de/node/21168

SUPPLY may result in the production and release of deadly carbon monoxide (CO) into the Provide combustion air using the instructions in home which can cause severe personal injury or Appendix A—Combustion Air. death. 4. CONNECT VENTING (i.e. Type B gas vent or flexible metal) as IMPROPER VENTING may result in requiredSIZE GAS PIPING, regulators, valves, NPT 80160456 3 1? x 6 Nipple 806600029 4 1? Tee 806601030 5 1? x ? Bushing 806600504 6 LWCO Sensor. NPT 102305-01 7 1? x 3 Nipple 806600005 8 1? Elbow 8066015Lock electrical boxes to prevent someone from inadvertently restoring power before the heating system is safe to operate. NEVER DEFEAT OR JUMP OUT safety devices. PROTECT EACH BOILER circuit with a properly sized over-current protection device.To view IQ Boiler 8-a). Control display information: 1. Press and release the “I” key on the IQ Boiler Control to change from one parameter to the next. Each setting will alternaThe LCD Display Kit includes a mounting bracket type display that allows a technician to monitor and wiring harness to allow mounting in the ES2 and adjust the IQ Boiler Control and connected IQ Option Cards. All boiler settings, status and plastic hood above the front door. For installation, error codes are displayed in full IF YOU SMELL GAS, STOP and repair the leak. Lighting the boiler when gas is leaking may cause explosion or fire. Follow the checklist below: 1. Verify that the venting, water piping, gas piping, and electrical systems are properly installed and checked. 2. Apply power to the boiler. CERAMIC FIBER, a possible human carcinogen Use a NIOSH approved respirator when servicing TURN OFF ALL GAS AND ELECTRIC power high-temperature insulation and gasket materials.Contact with Wash exposed skin gently with soap and water or release of dangerous flammable gas, electrical after contact Wash exposed clothingThe display on the IQ Boiler control should be the first place to check. http://jasperfirstumc.com/images/canon-powershot-s315-manual.pdf

Damper Failed The damper end switch has not opened (damper end switch is closed) at the 21 Closed beginning of the heat cycle. An alarm message is sent but the contr. IF YOU ARE NOT QUALIFIED to install or service boilers, do not install or service this one. Page 5 5 Figure S-1: Minimum Clearances to Combustibles and Closet Dimensions SPECIFICA TIONS (continued). Page 6 6 Installation: 1. Unpack the crate. 7 2. Position the boiler. 7 3. Page 7 7 THE BOILER IS TOP-HEAVY. Do not allow it to tip over. 1. Remove the sleeve. 2. Remove the contents from the skid, except the boiler. 3. Remove the four (4) hex-drive lag screws holding the boiler to the skid (Figure 1-a). 1. UNP ACK THE CRA TE 4. Tip the boiler and shimmy it off the skid. Page 8 8 4-a 3. PROVIDE COMBUSTION AIR INSUFFICIENT COMBUSTION AIR SUPPLY may result in the production and release of deadly carbon monoxide (CO) into the home which can cause severe personal injury or death. Page 9 9 4. CONNECT VENTING (continued) Model ES23 ES24 ES25 ES26 ES27 ES28 ES29 Input (MBH) 70 105 140 175 210 245 280 Minimum V ent Diameter (in) 4 5 6 6 7 7 8 V ent Height (ft) With B-V ent (double wall). Page 10 10 2. Screw the water supply manifold into the boiler outlet tapping “O.” 3. Orient the manifold with the relief valve on top. 4. Screw the relief valve into manifold tapping “RV”.Page 11 1 1 7. Screw an installer-supplied 1?” pipe or nipple into the water return tapping “R”. 8. Screw the supplied drain valve into tapping “D”. 6. CONNECT BOILER W A TER PIPING (contin ued) 9. See Figure 6b for suggested near boiler piping of IQ Options. Page 12 12 DISCONNECT ELECTRICAL POWER to the boiler and heating system before servicing. Positively assure that no voltage is present. Lock electrical boxes to prevent someone from inadvertently restoring power before the heating system is safe to operate. Page 13 13 Using IQ Boiler Control Displa y 8.

PROGRAM THE CONTROLS Viewing the Operating Mode Options In operating mode the user may view (but not change) boiler operating status, settings and troubleshooting information. To view IQ Boiler Control display information: 1. Page 14 14 Unit D i splay OR Samp le Di spl ay 1 s ec 1 s ec 1 s ec Please note that in operating mode to hold the display on the value the user can press and hold either the Up n or Down o keys and the value will be continuously shown. This may be helpful in watching a value “live”. Page 15 15 9. CHECK FOR GAS AND W A TER LEAKS GAS LEAKS may result in ?re or explosion. WATER LEAKS may cause extensive property damage. Page 16 16 10-b 10. PERFORM ST ARTUP CHECKS AND ADJUSTMENTS FAILURE TO PERFORM THESE CHECKS of the boiler's combustion and safety systems may result in serious property damage, injury, or death. IF YOU SMELL GAS, STOP and repair the leak. Lighting the boiler when gas is leaking may cause explosion or ?re. Page 17 17 ANNUAL MAINTENANCE CHECKLIST W ARNINGS THE BOILER CONTAINS REFRACTORY CERAMIC FIBER, a possible human carcinogen Use a NIOSH approved respirator when servicing high-temperature insulation and gasket materials. Wash exposed skin gently with soap and water after contact Wash exposed clothing separate from normal laundry. Use the following table along with this error number to. Page 22 22 REP AIR P AR TS LIST (continued) Key No. Page 23 23 REP AIR P AR TS LIST (continued) Key No. Page 26 26 REP AIR P AR TS LIST (continued) Key No. Page 27 27 INTERNAL WIRING Figure IW-1: W iring Diagram. Page 28 28 INTERNAL WIRING (continued) Figure IW-2: W iring Schematic. Page 29 29 Figure IW-3: Single Zone System with Domestic Hot W ater T ank Figure IW-4: Multiple Zone System with Zone Circulators INTERNAL WIRING (continued). Page 30 30 Figure IW-5: Multiple Zone System with Zone V alves Figure IW-6: Multiple Zone System with Zone Circulator Panel INTERNAL WIRING (continued). gunthermele.com/userfiles/files/Drenaggio-Linfatico-Manuale-Arti-Inferiori.pdf

Page 31 31 T STAT 1 VALVE 1 T STAT 2 VALVE 2 T STAT 3 OFF ON ZONE 4 PRIORITY TACO ZVC 404 (OR EQIV.) FOUR ZONE ZONE VALVE CONTROL WITH OPTIONAL PRIORITY THERMOSTAT BOILER JACKET PANEL 1 2 3 T T 1 1 4 2 3 5 6. Ignition failure, overheating, ?re, carbon monoxide, and spillage of ?ue gases may result from poor air supply. Failure to do so may cause products of combustion to enter the building resulting in severe property damage, personal injury or death.Page 35 35 THIS P A GE INTENTIONALL Y LEFT BLANK. SHUT OFF MAIN GAS SUPPLY prior to installing or servicing boiler gas piping. Page 37 37 5. Bond all above-ground gas piping to a grounding electrode and ensure the piping is electrically continuous.Page 38 38 (2) Comply with the boiler’s speci?c water quality requirements. See the Speci?cations Section of this manual. (3) Comply with the boiler’s speci?c requirements for minimum water ?ow through the boiler, installing a system bypass or primary-secondary loop if necessary to maintain ?ow through the boiler when serving small zones. Page 47 47 The IQ Boiler Control stores two boiler supply temperature setpoints in its memory; one setpoint is for the High Limit Setting and the second is for the Operating Setpoint. Additionally, if energy savings and improved home comfort is desired, select an Outdoor Reset IQ Option Card. Page 49 49 The LCD Display kit includes a mounting bracket and wiring harness to allow simple physical installation and “plug-in” style electrical connection. This intuitive display reduces setup and troubleshooting time by providing the user adjustment and alarm focused “help” and “information” screens. Page 51 51 SER VICE RECORD DA TE SERVICE PERFORMED. Page 52 52 L L i i m m i i t t e e d d W W a a r r r r a a n n t t y y F F o o r r R R e e s s i i d d e e n n t t i i a a l l G G r r a a d d e e W W a a t t e e r r a a n n d d S S t t e e a a m m B B o o i. {-Variable.fc_1_url-

We should do this for several simple reasons: First of all view first pages of the manual, you can find above. You should find there the most important technical data Burnham ES2 ES2 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Burnham ES2 ES2 you will learn all the available features of the product, as well as information on its operation. The information that you get Burnham ES2 ES2 will certainly help you make a decision on the purchase. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Burnham ES2 ES2. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Burnham ES2 ES2 along with tips on how to solve them. F o r s e rvi c e o r r e p a i rs to b o i le r, c a ll yo ur he a ti ng c o ntra c to r. Page 2 WARNINGS for the HOMEOWNER FOLLOW ALL INSTRUCTIONS and warnings printed in this manual and posted on the boiler.IF YOU ARE NOT QUALIFIED to install or service boilers, do not install or service this one. THE BOILER MAY LEAK WATER at the end of its useful life. Be sure to protect walls, carpets, and valuables from water that could leak from the boiler.Like all fuel-burning appliances, boilers need air to operate reliably and safely.Positively assure that no voltage is present. NEVER DEFEAT OR JUMP OUT safety devices. device. Page 13 8. Program the Controls Using IQ Boiler Control Display Viewing the Operating Mode Options The IQ Boiler Control is located inside the boiler front door, just above the IQ Option Panel (Figure 8-a). IQ Boiler Control In operating mode the user may view (but not change) boiler operating status, settings and troubleshooting information. To view IQ Boiler Control display information: 1. Press and release the “I” key on the IQ Boiler Control to change from one parameter to the next. Page 14 8.

Program the Controls (continued) 1 sec Sample Display 1 sec Unit Display OR 1 sec Please note that in operating mode to hold the display on the value the user can press and hold either the Up n or Down o keys and the value will be continuously shown. All boiler settings, status and error codes are displayed in full text. All Outdoor Reset IQ Option Card parameters are adjustable with graphic and help information screens. Page 16 10. Perform Startup Checks and Adjustments FAILURE TO PERFORM THESE CHECKS of the boiler's combustion and safety systems may result in serious property damage, injury, or death. Follow the checklist below: 1. Verify that the venting, water piping, gas piping, and electrical systems are properly installed and checked. 2. Apply power to the boiler. 3. Adjust zone thermostat to maximum setting. Page 17 Annual Maintenance Checklist WARNINGS THE BOILER CONTAINS REFRACTORY CERAMIC FIBER, a possible human carcinogen Use a NIOSH approved respirator when servicing high-temperature insulation and gasket materials. LABEL ALL WIRES prior to disconnection when servicing controls. Page 18 Troubleshooting When a problem occurs with the boiler operation, the Burnham IQ Control System easily provides specific, valuable information to help resolve the issue quickly. The display on the IQ Boiler control should be the first place to check. An alarm message is sent but the control is not in lockout. The damper end switch has not opened (damper end switch is closed) at the beginning of the heat cycle. Page 21 Repair Parts LIST Key No. Page 22 Repair Parts LIST (continued) Key No. Page 25 Repair Parts LIST (continued) Key No. Page 26 Repair Parts LIST (continued) Key No. Ignition failure, overheating, fire, carbon monoxide, and spillage of flue gases may result from poor air supply. www.dannykids.com.tw/upload/files/Drenagem-Linfatica-Manual-You-Tube.pdf

If the boiler is a Direct Vent boiler and exchanges all combustion air and combustion products directly with the outdoors, there are no special requirements for providing combustion, ventilation, and dilution air. Failure to do so may cause products of combustion to enter the building resulting in severe property damage, personal injury or death. INSPECT EXISTING CHIMNEY for obstructions and deterioration and repair or line the chimney prior to placing the boiler in service. SHUT OFF MAIN GAS SUPPLY prior to installing or servicing boiler gas piping.Also add a low-water cutoff when required by local code requirements.See the Specifications Section of this manual. (3) Comply with the boiler’s specific requirements for minimum water flow through the boiler, installing a system bypass or primary-secondary loop if necessary to maintain flow through the boiler when serving small zones. 6. Thermal shock (1) Do not over-pump. Use the following procedure on a Series Loop or multi-zoned system installed as per the figure below. Recheck Main Burner Flame. Size of Gas Meter Dial 16. Do not turn on any summer exhaust fans. 4. Close all fireplace dampers. 5. Operate the appliance being checked. For example, if additional safety limits are required, select Manual or Automatic Reset Aquastat or Low Water Cutoff IQ Option Cards. The LCD Display kit includes a mounting bracket and wiring harness to allow simple physical installation and “plug-in” style electrical connection. Lancaster, Pennsylvania hereby extends the following limited warranties to the original owner of a residential grade water or steam boiler or U.S. Boiler Company, Inc. Be sure to check that it is the user manual to exactly the device that you are looking for. In our database Burnham ES2 it belongs to the category Boiler. A user manualBurnham ES2 is taken from the manufacturer, a Burnham company - it is an official document, so if you have any doubts as to its contents, please contact the manufacturer of the device Burnham ES2 directly. You can view the user manualBurnham ES2 directly online or save and store it on your computer.If you have any questions, you can ask them in the form below. Other users viewing this website will have the opportunity to help you solve your probem with Burnham ES2. Remember that you can also share the solution. If you solved the problem yourself, please write the solution to the problem with Burnham ES2 - you will surely help many users by doing so.Ask a question - our users can help you. We have no relationship with advertisers, products, or services discussed at this website. Find the boiler serial number, usually at upper right corner of the data tag where the manufacturing date is given in parehtheses: Burnham's online repair parts book is a large 130 page PDF document.Part No 8010601. Current product list (2018): Alpine condensing gas boilers, Aspen, K2, K2 Combi, X-C, Sage zone control, ES2, ESC, Series 2, Series 3, Series X2, Independence gas steam boiler, MPO-IQ, MegaSteam, V8H, Alliance SL domestic hot water heater, Radiant cast iron radiators, Slenderized radiators, Baseray cast iron baseboard, Classic water or steam radiators. In general, just to get our terminology right, usually we call hot water heating equipment a boiler and we reserve the name furnace for warm air heating systems. I know there was an exception but that's generally the case. For the second example, after the 35 (probably model number) the next two digits 04 are month and the nect two digits 89 the year of manufacture of the unit. In the third example we're stuck again - when you've found the serial number, I'd give the company a call, give model and serial number, and just ask them. Let us know what you learn as it will assist other readers. You'll want to look at the product serial number not just model number. Mr. Hankey is a past chairman of the ASHI Technical Committee and the ASHI Standards Committee. Mr. Hankey serves as co-chairman of ASHI legislative committee, and has served in other ASHI professional and leadership roles.Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Carson Dunlop Associates' provides extensive home inspection education and report writing material. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume. Special Offer: For a 10 discount on any number of copies of the Home Reference Book purchased as a single order. InspectAPedia.com editor Daniel Friedman is a contributing author. Or choose the The HOME REFERENCE eBook for PCs, Macs, Kindle, iPad, iPhone, or Android Smart Phones. Special Offer: For a 5 discount on any number of copies of the Home Reference eBook purchased as a single order. You must have JavaScript enabled in your browser to utilize the functionality of this website. Fine luxury at a modest price, we highly recommend this line for your next Kitchen project. Shop and Compare to Robern M Series. Satisfaction Guaranteed. We have all Residential or Commercial Units at the Lowest Prices. Save on Outdoor Lighting, Bathroom Lighting, and much More!. By using this site you agree to our Terms, Conditions of Use and Privacy Statement. Please check your inbox, and if you can’t find it, check your spam folder to make sure it didn't end up there. Please also check your spam folder. When seeking information on boiler, provide Boiler Model Number and Serial Number as shown on Rating Label. These Codes and Regulations may differ from this instruction manual. Authorities having jurisdiction should be consulted before installations are made. The warranty for this boiler is valid only if the boiler has been installed, maintained and operated in accordance with these instructions. Failure to follow all instructions in the proper order can cause personal injury or death. Read and understand all instructions, including all those contained in component manufacturers manuals which are provided with the appliance before installing, starting-up, operating, maintaining or servicing this appliance. Keep this manual and literature in legible condition and posted near appliance for reference by owner and service technician. Follow the instructions contained in this manual. Installation, maintenance, and service must be performed only by an experienced, skilled and knowledgeable installer or service agency. All heating systems should be designed by competent contractors and only persons knowledgeable in the layout and installation of hydronic heating systems should attempt installation of any boiler. It is the responsibility of the installing contractor to see that all controls are correctly installed and are operating properly when the installation is completed. Installation is not complete unless a pressure relief valve is installed into the specified tapping located at the rear of appliance - See Section III of this manual for details. Do not install boiler on carpeting. Do not operate on floors where heat affected material is below. Retain your contractor or a competent serviceman to assure that the unit is properly adjusted and maintained. The inside of combustion chamber should also be cleaned and inspected at the same time. Do not operate unit with jumpered or absent controls or safety devices. Operationundertheseconditionswill result in sustained condensing within the combustion chamber and potentially reduce boiler longevity. Continued operation under these conditions may result in premature boiler failure through thermal shock. Do not unscrew any pipe fittings nor attempt to disconnect any components of this boiler without positively assuring the water is cool and has no pressure. Always wear protective clothing and equipment when installing, starting up or servicing this boiler to prevent scald injuries. Do not rely on the pressure and temperature gauges to determine the temperature and pressure of the boiler. This boiler contains components which become very hot when the boiler is operating. Do not touch any components unless they are cool. Do not operate boiler with the absence of an approved vent system. Clean and unobstructed venting and air intake systems are necessary to allow noxious fumes that could cause injury or loss of life to vent safely and will contribute toward maintaining the boiler's efficiency. If damage due to frozen pipes is a possibility, the heating system should not be left unattended in cold weather; or appropriate safeguards and alarms should be installed on the heating system to prevent damage if the boiler is inoperative. Do not use gasoline, crankcase drainings, or any oil containing gasoline. Never burn garbage or paper in this boiler. Do not convert to any solid fuel (i.e. wood, coal). Do not convert to any gaseous fuel (i.e. natural gas, LP). All flammable debris, rags, paper, wood scraps, etc., should be kept clear of the boiler at all times. Keep the boiler area clean and free of fire hazards. Refer to instructions in Section V, Paragraph C for inspection and cleaning instructions. An ASME Data Label is factory applied to each V9A jacket, which indicates the boiler Maximum Allowable Working Pressure (MAWP). Each cast iron section is permanently marked with the MAWP listed on the boiler’s ASME Data Label. Those values for the V9A are as follows: Therefore, Burnham offers safety relief valves set at or below the MAWP of the boiler. See Table 1 for available safety relief valve set pressures. If 8” BMP is specified (refer to Figure 1), add 0.7 cu. ft. to volume listed above. Ratings shown above apply at altitudes up to 1000 feet on oil and 2000 feet on gas. Our responsibility ceases upon delivery of crated boiler to the carrier in good condition. No claims for variances from, or shortage in orders, will be allowed by the manufacturer unless presented within sixty (60) days after the receipt of goods. Refer to Figure 1 for boiler dimensional data. See Table III. However, increased service and maintenance difficulty will result. Do not install boiler on carpeting. A boiler foundation similar to the one shown in Figure 2 is recommended if the boiler room floor is weak or uneven or if a water condition exists. Refer to Figure 2. Listed clearances cannot be reduced for alcove or closet installations. The openings shall communicate by means of ducts, with the outdoors or to such spaces (crawl or attic) that communicate with the outdoors. Lined masonry chimneys are acceptable with the appropriate vent connectors using materials described above. See Table I for the proper vent outlet size. For low silhouette vent terminations, see Figure 3b. Draft controls are not normally required, although they may be used on installations where a natural draft stack is used or on multiple boiler installations with a common stack. The boiler is provided with a breeching damper, which should be adjusted to maintain a positive pressure of 0.1” W.C. in the vent connector box during burner high fire operation (see breeching pressure sensing port in Gas tight vent systems designed for pressure systems must be used to prevent flue by-product leakage. The vent height is usually limited to prevent negative draft, typically three (3) feet above the roof line (see Figure 3a). The damper shall be adjusted to maintain a positive pressure of 0.1” W.C.