Document Lp9E193q8ZNba1pkrny52oKjq

AMERICAN FR-A-5 OIL STANDARD BOILER INSTRUCTION MANUAL BOILER-BURNER UNITS f? NOTICE TO INSTALLER AND OPERATOR ` fTHIS BOOKLET MUST BE AFFIXED ON OR ADJACENT TO THE HEATING EQUIPMENT. FORM BP-32240 SERIES NO. 1B-J3 05454 FR-A-6 BOILER 1 IMPORTANT! See instructions on page 3 for proper setting of boiler. When boiler sections have been assembled, it is essential that boiler be tested before platework, jacket or piping is installed. BEFORE FIRE IS STARTED IN BOILER - plug all boiler tappings and fill entirely with cold water. To protect and safeguard the accuracy of steam or water gauge supplied, DO NOT INSTALL GAUGE UNTIL AFTER TESTING OF BOILER OR SYSTEM. Testing pressure should be at least 10 pounds but should not exceed 50 pounds. EXAMINE BOILER CAREFULLY, INSIDE AND OUTSIDE, to insure against leaks through concealed breakage caused in shipping and handling. After making certain that there are not leaks, remove plugs for boiler trim and other connections. This precaution is for your protection and will simplify handling of necessary replacements and adjustment claims. DRAIN TAPPING - Back of boiler is provided with two drain tappings at lowest water space practicable, as per A.S.M.E. Heating Boiler Code. Either tapping can be used to drain boiler entirely. DO NOT PLACE DRAIN COCK IN RETURN PIPING LINE. CAUTION - The expansion tank should not be set in a cold or an exposed place. If the pipe leading to or from the tank freezes, serious damage may result. If valve of any description is installed in the piping leading to or from the expansion tank BE SURE THAT IT IS OPEN WHILE THE BOILER IS IN OPERATION. LOCATION - Locate the boiler near the chimney or flue and as centralized with respect to the heat distribution system as practicable. If water condition exists in the basement, or if it has been necessary to waterproof the basement floor, the boiler should be mounted on a concrete or hollow tile base, preferably to a height of at least three inches. 05455 FR-A-3 BOILgR 2 Seotions mist be assembled according to arrangement listed below to Insure proper operation and that knockouts in the water heater door register with water heater connections. CODE LETTERS FI - Front Connecting CT - Center with water heater opening C - Center without water heater opening SX - Back Connecting wnTT.ua NUMBHtS STEAM WATER ARRANGEMENT OF SECTIONS FROU FRONT OF BOILER For Boilers With Water Heater 12 31*5678? 10 11 FR-A-50li-S3 FR-A-505"SB FR-A-506-S3 FR-A-507-S3 FR-A-50&-SB FR-A-509-S3 FR-A-510-SB FR-A-5U-S3 FR-A-50l*-W3 PR-A-505-VrB FR-A-506-W3 FR-A-507-^m FR-A-50B-WB FR-A-509-WB FR-4-510413 FR-A-511-W3 FX CT FI CT FX CT FX CT FI CT FX CT FX CT FI CT CT BX CT CT BX CT CT C BX CT CT C C BZ CT CT C C C EX. CT CT CT c C C BX CT CT CT c C C C HI CT CT CT c C c c C BZ BOILER NUUBBtS STEAM WATER ARRANGEMENT OF SECTIONS FROU FRONT OF BOILER For Boilers Without Water Heater 12 31*56789 10 11 FR- A-50l*-S3 FR- A-505-S3 FR- A-506-S3 FR- A-507-SB FR- A-508-S3 FR- A-509-ffl FR-A-510-S3 FR-A-511-S3 FR-A-50i*-WB FR-A-505-WB FR-A-506-WB FR-A-507-WB FR- A-S08-WB FR-A-509-WB FR-A-510-ATB FR- A-511-TTb FI C FI C FI C FI C FI C FI C FI C FI C C BZ . c C BZ c C C BZ c C C C BZ c CC CC BX c CC CC C BZ c c c' c c c c c cc C C BZ CCC BZ 05456 T2-A-4 BOH?. 2 Fig0 1 ?u>. 2 IMPORTANT - In setting up the boiler it is necessary that adequate clearancs end combustion apace be provided for proper functioning of the oil turner to be installed. The floor or raised base (if provided) root be level u insure tnat openinge in the Jacket will register properly with the corresponding tappings on the boiler* Refer to distensions of assembled boilers on p&f,e 12 d; t: the setting of the boiler with regard to the chimney. This boiler is r.om.rii>' a;, tumbled iron front to back, therefore, space for the boiler and working ipt-ce fee ssemblir.s uhs b?.ak section must be provided* ASSEMBLY OF SECTIONS 1. Place the front section in its approximate final 1 cat. <_ regard to th> chimney and support it with a suitable prop. It ic v.r -ndeo that a 2-1/28 plug be installed hand-tight In the front uo held the* end of thu prop. See Fig. 1* 2. Clean nipples and nipple openings with kerovsna or gasci: <;e and apply good lub ricating oil. DO NOT USE PAINT, RED LEAD or CEMENT. 3* Drive nipplea squarely into section using block of wood <vd hamracr, an aluminum headed hammer, if available* preferably U* Special nipple setting gauge is provided for the largo: .' roxea. Gauge nipple in both directions to insure that it is driven to the proper ispth into the nipple opening. Cutout in gauge must rest on nipple, u-itu lops o!' gauge touching finish* face of paction, when nipple ia properly driven. See Fig. 1 Uee rule or suitable gauge for smaller nipples, to insu-s '.hat they are properly driven and project equally all around, Hipplts &uet project. 1/16' :norc thM half their length cut,3ide of tha flmishsA face of the eootion. 05457 h Fig* 3 Fig* u 5. From arrangement of sections (See tables on preceding page) select next section according to code letters on section,, IMPORTANT - Hippies must be driven as directed to insure tight joints0 Most nipple leaks are caused by tilted or cocked nipples* Paint ground joint3 of each section before adding the next section. Clean nipple openings and place the section on nipples of the front section. To facilitate assembly, it is advisable to enter the upper nipple first in its port, then enter the lower nipples in their respective ports* 6. Run the nuts up full length of the thread, on one end each of the three tie rods. Place regular steel washers r.nd flanged draw-up washers on tvro rods and insert them in the lower tappings from the front. Insert the remaining rod with regular steel washer in the tapping opposite the upper nipple. Place the 10" draw-up block, steel washer and nut on this rod. Draw the nut up fairly tight and adjust the draw-up block in horizontal position central with the nipple opening. Place flanged washers and regular steel washers on the lower rods and run nuts up hand tight. See Fig, 3, for application of draw-up blocks. 7. Drive section in place with heavy block of wood- striking blows as squarely as possible over nipp7.es. Draw-up evenly on all nuts starting with lower tie rods. Tighten nuts alternately tint'll sections make contact at ground joints. APPLY OIL OR GREASE FREELY TO TIE ROD THREADS WHILE ASSEMBLING SECTIONS TO PREVENT STRIPPING OF THREADS ON ROD. Continue assembling sections in their respective order. NEVER ASSEMBLE MORE THAN ONE SECTION AT A TIME. 8. Place the back section in position and run the tie rods through the lugs on front and back sections - CAUTION SHOULD BE USED IN DRAWING-UP THE BACK SECTION, adjust the nuts on the front ends of the rods so that they are no more than flush in order that as much thread as possible is available at the back to begin the drawing-up operation 05458 5 0O Drrs7"wp evenly on ail rnris ap pr-rricusly directed but only after dri-ring the section Conte up ztvL hnr.vy bice': <r rccd to rreiiGrr isn.cisn on. the tie rod threads several taaec b.urir.y iha irrrsisijj-ssp cpesaticELo 9o After ths bad has been dram-up to make contact at ground Joint., back-off tie rod nuts one half tunic Rods should project equally at each end -to insure proper fit of the jacket. Seo Fig, L for boiler section assemblage to be equipped with biltin water heaters. Attach flow and return niping lin.es and insert plugs and buslines in sections as required Ins'tall fittings provided tc elevate the safety valve or pressure relief valve so that the discharge Till be above the jacket0 In case cf steam boilers insert two 1/2U extension pieces in tappings on left side or front section to take gauge glass fittings. If boiler is to be provided with try cocks, also insert two 3/8" extension pieces. EtPORTAHT - See instructions for testing boiler on Page 1, 10. Pjac canopy on boiler and attach to forked lug at top of front and back sections with $/lSa round head machine screws. Seal between outside of canopy and sections with boiler putty. Also putty outside of sections at joints with boiler putty, NOTEs Canopy insulation is packed inside of the canopy0 Remove and apply insulation (foil side out) to the canopy. Fold in at corners for maximum coverage. It Is recommended that a strand of light wire be used for holding the insulation- snug at sides and corners0 Install cleanout cover assembly. See that upper lock clips are loose and at bottom of slots. Force the bottom clips down behind the lower projections in the section cleanout openings., then secure the cover by raising and tightening the upper lock clip ring nuts. Seal cleanout cover all around with boiler putty. 05459 -ait 6 FRONT BURNER PLATE - Th3 front burse? plate ?,? factory aBsescabled except for the burner mounting plats. Assemble fee burner mounting plats to tbs burner plate with four 3/8" hexagon bead cap screws supplied. INSTALL T.TT EUFJNiiS MOUNTING PLATE WITH THE BURNER OPENING IN TEE DCWEE POSITION FC~ FOUR. (4) AND FIVE (5) SECTION BOILERS, AND TEE TURNER OPENING IN THE UPPER POSITION FOR. BOIL ERS WITH SIX (6) OR MORS SECTIONS. Cut a 8-1/0" dia. hole to fee fee.riJ.&Tcr to ccrrsspccsl rife tbs location of the burner mounting plate. Figure 5 ab`rrrs 'its pocittco. ci its ctmen marring plats for four (4) and fj.ve (5) sec-lor totters1-. Wacn. the boiler bae sfe (6) or more roeTone, THE POSITION OF THE BURNER MOUNTS-:: PLATE'13 REVERSED. WATER BEATERS - Seeticrr. wife ra.tor heater onesriage must be assembled next to the front 3ecf.c7.-.. Insert heaters ssith gaeSsste in saeulcrc, HvIFOETAN? - See that heaters are fosereso *r cermet poeSitor. for Steam or for Water ?a required according to lettering cast on fee beats? nrrr.'feg plats. Attach heaters wife cap sersr-e provided. Leave screws rUgb.'/;- lee-- erfl. -he copper fiKirg- assemblies are applied. scree.-:?; ~2fc water beafera place. 05460 FB-A-6 BGS1XR 7 ---- Fig. 11 ASS3QJLI OF JACKET - Place the bottom strip for the front panel in place belcnr the return tappings. Install the rrazfcer and series plate on the front jacket panel with #6 x l/Un sheet metal screws provided. Install panel by sliding it down behind the flanges of the front burner plate. Attach the bottom jacket strip to the front panel with two jacket screws. Fig. 7 - shows the front panel assembled to the boiler. If the boiler has more than seven sections the jacket side panels will consist of two pieces which should be assembled before application. Omit the top screw when assembling the two piece side panel as this screw is inserted when the top panel is assembled. Side panels should be installed following the front panel. In case of steam boilers remove knockouts from the left side panel for gauge glass fittings and for try-cocks when pro vided. 05461 PTl-A-8 BOtlXR 6 Fig. 12 Unless otherwise noted the jacket is assembled with #10 x 1/2" sneet natal screws throughout. 00 NOT DRAW SCREWS UP TIGHT UNTIL JACKET IS FULL! ASSEMBLED. Assemble the back panel next, then follow with the top panel. After the jacket is completely assembled, all jacket screws should be drawn-up uniformly tight, except In case of boiler provided with jacket extension. See Fig. 8 - for completely assembled jacket (front view) for boiler with water heaters. The door for the water heater opening in the right hand side panel and the cleanout door in the left hand side panel should be attached with sheet metal*screws. BOTI.fr WITH WATER HEATER - Before drawing up water heater cap screws, it is recommended that the connector fitting assemblies De inserted temporarily without the compression sleeves. Slight adjustment of the water heaters may be necessary to register the connections. Draw-up evenly on the cap screws to insure tight joints between sections, gaskets and heaters then remove the connector fitting assembly. Remove the necessary knockouts from the water heater door and install same in the side panel* Place the coaq>resson nuts and sleeves from the water heaters on the fitting assemblies and install the assemblies or. the heaters. Run the compression nuts up a few turns by hand before using wrench in order to avoid possible damage to tbs threads. STEAM BOILERS - Install the watrr column trim in the extension fittings previously in stalled before the jacket wa*. applied. Install the pressure and vacuum gage and control as shown in Fig. 13, Instal' the safety valve and drain valve* 05462 FR-A-6 BOILER Fig. 9 shows front, view of steam hollar nsatabled completely with water heate also Arcofiame oil burner mounting plat as it is to be ajsemblca on hollars i six sections snd larger. Pip. 10 - shews rear vlaw of steal boiler assenbled completely with water nest Y.'ATER BOILERS - Install the combination altitude gage and thor-.cr.eter -tr.s irr.e limit control. .Also install the pressure relief valve and drain valve. Fir. 11 - shows front view of water boiler assembled completely when water hea are required. iU3"l! hVUBER OF WATER HEATERS TO BE USED WITH EACH TOILER Y/KEN CONNECTED IN PARAJ1EL Boiler Number Capacity Rating "als. Per liirrute Maximum Number of Heaters ir. Parallel. 'R-A-50L 'R-A-505 R-A-SC6 R-A-SO? R-A-508 'n-A-50? R-A-510 'R-A-pll 7 Cal. 10 ft 10 n 10 n 13 n 71 16 H 16 ft Two Three n n Tcvir r Five NOTE: - Additional heaters can*be installed where the heaters are serving different systems end it is not Likely that the heaters will all be in use at the same tire. BOILER WITH JACKET EXTENSION - Following are assembly operations for attaching front extension to boiler after the regular (Flush Type) Jacket Is complete. If not previously left loose all jacket screws attaching side and top panels t front panel must be loosened. Assemble the two extension side panels with the 8" x 20" opening at the bottom the notched edge inserted between the aide and front panels. Tightor. screws t panels in place. Assemble the bottom front tie panel to the two side panels with #10 x 1" sheet screws provided. Assemble the top extension panel with the rear edge inserted between the top ar panels of the regular Jacket. It must also extend down over the side panels, three Jacket screws on each side and one screw at each upper front comer. Dr screws up tight. Install the front door panel by engaging the bottom flange first. Fig, 12 - s boiler complete with Jacket extension. 05463 FR-A-5 BOILER CONTROL APPLICATIONS location t*a<plamoors trcAH waTc F 2> LOcNuTN-AoTrCrM NOT LStO G INHTCCtOllNATRIOL LTIM(MIT>C(OIUNTTRVOItL h OrAMMCHKLACTMttONCcAoTnCt* NOT UKO J K \ MMQCA1O1UCRC NOT VSCO T0CA*rMOCwR6RMtRLAA*CM4TSCAOMSLMTMAlCMTtCATuOOTCONC*CTR. L \ MOT LTSCO REVECROSNETRAOCLTINO notc - ft* *LACOMw-SoCorCrnTIoOMnMiix*rcmMoi,ry(aocn*toM*CoTrioh Eig. 13 10 FRONT VIEW-SHOWING CONTROL TAPPINGS CENTER SECTION SHOWING TANKLESS WATER HEATER (STEAM BOILER SHOWN) Fig. ll SECTION thru BOILER with EXTENDED JACKET -c- nSuEmCbTeIOrNoSr Dimensions 1 L A C`0 4 =2 i '? 9 '3i 5 2T| 2> 9 I3l 6 3I 2*i <2 isj 7 36j 30 12 6 40| 34i (2 ' 9 39 14 163 iO i 2 14 I6j 11 46 14 i3 SECTION THRU BOILER WITH FLUSH JACKET Fig. is NUMBER OF SECTIONS 4 5 DIMENSIONS LA BC 47 16? 22? 9 52? 21 27? 9 D 13? 3? 6 56? 25? 3<? 12 16? 7 61? 30 36? 12 16? e 65? 34? 40? 12 18? 9 70? 39 45? 14 16? i10 74 43? 49? 14 16? 1 1 79? 48 54? 14 16? Jig. 16 ' !'1 05464 FR-A-5 BOILER NOIL: it is important that water HEATERS 9E ASSEMBLEO IN BOILER STARTING with The SECONO SECTION FROM FRONT OF BOILER HEATERS ARE TO BE INSTALLED WITH THE WORO 'WATER' TO TOP On water BOILERS AND 'STEAM* TO TOP ON STEAM BOILERS r,r rau-*B PARTIAL SIDE VIEW SHOWING WATER HEATERS FOR 5. A. 7 & 8 SECTION WATER BOILERS 05465 FR-A-6 BOHJER ATOP PLOW TAPPINGS or DIMENSIONS lCCT<ON l * a * c 0 { 4 jfZISi!I3it a ,* >i s Hi a Iij L*>_ 6 J'J jaj 'si <0 ! 12 0 ? 39 -<i '0 <2 c 8 <0 <2 to 9 Isj 18 <ej <2 <1 " >0 '* ` u It 1 Saj AT 'I*i| <2'0 12 LM SIDE VIEW FRONT VIEW PM SIDE VIEW Fig. 22 - Dimensions For Boiler With Flush Jacket Fig. 23 - Dimensions For Boiler With Extended Jacket 05466 FR-A-5 BOILER 13 CAUTION efore starting burner see that boiler is properly filled. Following filling, the piping elsewhere in the system should be checked for leaks. After boiler is in operation make-up water should be added slowly. Steam boilers should be filled until water is visible approximately 3-3/4 inches in gauge glass. Fill the entire system on water boiler installations. CLEANING BOILERS - The grease used to lubricate the cutting tools during erection of new piping systems serves as a carrier for dirt, with the result that a scum of fine particles and grease accumulates on the surface of the water in all new boilers, while heavier particles may settle to the bottom of the boiler and form sludge. These impurities tend to cause foaming, preventing the generation of steam and causing an unsteady water line. This unavoidable accumulation of oil and grease should be removed by blowing-off the boiler as follows; If not already provided, install a surface blow connection of at least 1-l/k inch nominal pipe size with outlet extended to within 18 inches of the floor or to sewer, inserting a valve in line close to boiler. Bring the water line to center of outlet, raise steam pressure and while burner is operating, open valve in blow-off line. When pressure recedes, close valve and repeat process adding water at intervals to maintain proper level. As a final operation bring the pressure in the boiler to about 10 pounds, close blow-off, stop burner and open drain valve. After boiler has cooled, partly fill and flush out several times before filling it to proper water level for normal service. The use of soda or any alkali, vinegar or any acid is not recommended for cleaning heating boilers because of the difficulty of complete removal and the possibility of subsequent injury after the cleaning process has been completed. Illustration shows suggested piping arrangement for blowing-off steam boilers. ATTENTION TO BOILER WHILE IN OPERATION Keep water in steam boiler at proper level (Approximately 3-3/h inches high in gauge glass) Keep water systems filled to 1/3 of expansion tank (as indicated by moving hand being even with stationary hand on altitude gauge). ON A CLOSED HOT WATfcat SYSTEM THE PRESSURE MUST NOT EXCEED $0 LBS. IF IT DOES, IT MUST BE RELIEVED IMMEDIATELY AND THE CAUSE OF FAILURE INVESTIGATED AND CORRECTED, OTHERWISE PRESSURE MAY BUILD UP AND CAUSE DAMAGE TO HEATING SYSTBI. Clean boiler surfaces at regular intervals. DO NOT draw water from boiler while in use. When adding water while boiler is in operation, do not open supply valve fully but add water slowly. On steam boilers - at the start of each heating season and once or twice during the season try SAFETY VALVE to be sure it is in working condition. To do this fasten wire or cord to lever of valve and pull lever - standing safe distance away from valve. I f . -if.! 05467 FR-A-5 BOILER Hi ATTENTION TO BOILEP 'WHILE iJOT IN CPEKATICM At end of heating season clean boiler surfaces thoroughly. Spray inside surfaces with light lubricating or crankcase oil using gun with extended stem so as to reach all corners. Leave observation door and secondary air shutter open to permit air circulation through boiler. Clean and remove smokepipe where feasible. With steam boilers, at end of season add sufficient water to fill boiler to top of water column and leave it that way until fall, when water should be drained again to proper level. If at this time boiler water is dirty, drain water, flush out boiler, and refill with clean water to prescribed water level. On water boilers keep system filled with water. In other words, leave water alone. It is advisable in fall to drain a little water to remove sludge but not more than necessary. IF BOILER IS NOT USED DURING WINTER TIME IT MUST BE FULLY DRAINED (See Page 1) COMBINATION ALTITUDE GAUGE AID THERMO;JETER FOP. WATER BOILERS IMPORTANT - To avoid damage to gauge or possible impairment of its accuracy. DO NOT INSTALL UNTIL BOILER OR SYSTEM HAS BEEN WATER TESTED FOR TIGHTNESS. Combination Gauge is used with water boilers and is connected into tapping at front of boiler. Gauge serves to indicate the following: 1. Temperature of Water at the boiler, 2. Height of water level in feet above the gauge for OPEN SYSTEMS where expansion tank is used. 3. Water pressure in pounds per square inch for CLOSED SYSTEMS where pressure is controlled by means of automatic relief or regulating valve WITH or WITHOUT use of- air tight pressure or cushion tank. IN CASE OF OPEN SYSTEM, where expansion tank is used it will be necessary to fill the system with water up to 1/3 of the expansion tank as directed under OPEIATION and CARE. The rim and glass in gauge should then be removed after loosening two screws or other means of holding rim in place. It will be found that the automatic pointer on the ALTITUDE SCALE, which indicates HEIGHT IN FEET and PRESSURE IN POUNDS has moved up and indicates neight of water level, above the boiler in the expansion tank. The adjustable pointer (generally finished in color) should then be moved by hand UNTIL DIRECTLY UNDER AUTOMATIC POINTER. 05468 FR-A-6 BOILSR 15 Any loss of water within the system will be indicated by the AUTOMATIC POINTER receding to a smaller figure on the Altitude Scale at which time the water supply should be opened until the Automatic Pointer is again directly over the adjustable pointer* After setting adjustable pointer- replace rim and glass and tighten screws. In case of Closed System, it is necessary to know that EXCESSIVE PRESSURE is not permitted to build up, ON A CLOSED HOT WATER SYSTEM PRESSURE MUST NOT EXCEED 50 LBS. IF IT DOES, IT MUST BE RELIEVED IMMEDIATELY EITHER THROUGH RELIEF VALVE, DRAIN COCK OR OTHER SUITABLE CONNECTION, AND CAUSE OF FAILURE OF RELIEF VALVE INVESTIGATED AND CORRECTED, OTHERWISE PRESSURE MAY BUILD UP AND DAMAGE HEATING SYSTEM* GENERAL MAINTENANCE OF HEATING SYSTEM 1. Keep radiators and convectors clean- 2. Keep system in good repair. It is advls :ble to hava it inspected by your heating contractor at least once a yaar0 3* If a hot water radiator is hot at the bottom but not at the top, it indicates that air has accumulates inside and should be vented. To vent radiator: Hold small cup under air vent (located near top of radiator), open vent until water escapes and then close. U. Fill steam boilers only as directed on Page 13o 5. Fill Hot water systems as follows; Open all radiator valves, but keep rents at top of radiator closed. Fill open systems until hands on altitude gauge are even. If it is a closed system the water filling will 8top automatically when proper pressure is reached. (Pressure should not exceed 50 pounds). Then, beginning with ground floor, vent each radiator as directed above. It may be necessary to add water during this operation to expel air from higher radiators* 6* If much water is added to system, it is advisable to heat system to a high temperature and vert again. This will make less venting necessary during the winter. 7. Where an expansion tank is used, make sure that neither the tank nor its drain pipe is exposed to freezing temperatures. Never place valves in piping leading to or from expansion tank. GIVE BOILER SIZE and SERIES NUMBER WHEN ORDERING REPAIR PARTS I 05469 fr-a-5 boiler 16 05470 CAUTION TO INSTALLER AND OWNER This hydronic heating boiler incorporates the best in engineering and manufacturing techniques and will give years of good service and trouble-free operation if properly treated. The heat transfer surface has been carefully designed to give optimum performance and reliability. However, the presence of contaminants such as scale, sediment and boiler sealing compounds in the section waterways may serve to insulate the heat transfer surface and cause premature failure of the sections. Scale build-up can be prevented by good installation practices which eliminate addition of makeup water to the system. Sediment which may accumulate in the boiler should be flushed out on a regular basis in accordance with recommended maintenance practices. Occasionally, leaks will be detected in the system. These leaks are usually of such a nature that they may be prevented or cor rected by good workmanship. Every effort should be made to correct them without the use of boiler sealing compounds. If sealing com pounds are used, they should be used as sparingly as possible and never in excess of the manufacturer's recommendations. Following their use the boiler must be thoroughly flushed out. Otherwise, serious damage may result. In some special installations, glycol anti-freeze is added to the water in the system to protect against freezing during cold weather when the boiler is not being fired and the system is not drained. Although American Standard cannot recommend this practice, we recognize that glycol anti-freeze will occasionally be used. Heat transfer is poorer with glycol than with water.--Therefore, glycol should never be used in greater quantity than 50% in the system; with any_ quantity, radiator output will be lower than with plain water. It is always better, when possible, to drain the entire system, rather than use anti-freeze; the heating system and house plumbing will not freeze while the heating system is operating; and plumbing is not protected if the heating system is not opera ting, whether or not anti-freeze is used. Cast iron is highly resistant to corrosion. However, some pro pellants used in aerosol cans break down into p oison gas and corrosive gas at high temperature: if aerosol mixtures are used near boilers, the aerosol will enter the boiler flame and be heated. Continued use of aerosol cans near heating systems may result in severe boiler heating surface corrosion and possible danger to health. 05471 AMERICAN STANDARD 05472 IMPORTANT BEFORE INSTALLING THIS BURNER,MAKE SURE THAT THE NOZZLE USED AND THE BURNER DIMENSIONS CORRESPOND TO THOSE LISTED FOR THE PROPER BOILER ON THE ACCOMPANYING DATA'SHEET NO. HSK-I7I. NOZZLE AND BURNER SETTINGS AS SUPPLIED,IF DIFFERENT FROM SHEET NO. HSK171, MAY GIVE VERY POOR PERFORMANCE. 05473