Crown Boiler Series 24 Commercial Boilers - LSKair

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Series 24 Minimum Piping Recommendations – Water Boiler1Recommendation 1 is usedwhen the load is constant andnot varied due to mixing ormultiple zones. Use when:1SUPPLYREAR OFBOILERDRAIN VALVE(SEE NOTE 4)SUPPLYREAR OFBOILER■ system return water is notless than 135° F forprolonged periods of time■ system flow does not impactflow through the boilerDRAIN VALVE(SEE NOTE 4)3” x 12” NIPPLEAND BELL REDUCER(SEE NOTE 3)2RETURN24-03 THRU 24-11 (W/20°F DROP)24-03 THRU 24-12 (W/40°F DROP) 24-12 (W/20°F DROP)23 212ARETURNHEADER2BRETURNBRANCH 2RETURNRecommendation 2 is a primary-secondary piping methodthat maintains a constant flow through the boiler by using asecondary boiler circulator. This arrangement isolates theboiler from flow variations but does not safe-guard againstcold return water temperatures. Use when:■ system return water is not less than 135° Ffor prolonged periods of timeSYSTEM PUMP1 SUPPLYBOILER CIRCULATOR(BY OTHERS - SEE NOTE 5)MAX4DCLOSELYSPACEDTEESBOILER CIRCULATOR(BY OTHERS - SEE NOTE 5)DRAIN VALVE(SEE NOTE 4)SYSTEM PUMPSUPPLY■ system flow does not impact flow through theboiler (i.e. zoning, mixing)DRAIN VALVE(SEE NOTE 4)REAR OFBOILER3” x 12” NIPPLEAND BELL REDUCER(SEE NOTE 4)PIPE SIZING AND NOTES FOR RECOMMENDATIONS 1 AND 2RETURN PIPING SIZE (IN)SUPPLY RETURN RETURNPIPING HEADER BRANCHSIZE (IN) (1) RETURN (2) (2A) (QTY.) SIZE (2B)BOILER 20°F 40°F 20°F 40°F 20°F 20°FMAXMODEL DROP DROP DROP DROP DROP DROP4DSYSTEM PUMP24-03 2 1-1/2 2 1-1/2 – –MAX24-04 2 1-1/2 2 1-1/2 – CLOSELYSUPPLY4D –SYSTEM PUMPSPACED24-05 2 1-1/2 2 1-1/2 – – TEESBOILER CIRCULATOR24-06 2-1/2 1-1/2 2-1/21SUPPLY 1-1/2 – –(BY OTHERS - SEE NOTE 5)24-07 2-1/2 2 2-1/2 2 – –24-08 2-1/2BOILER CIRCULATORDRAIN VALVE(BY 2 OTHERS 2-1/2 - SEE NOTE 5) 2 – –(SEE NOTE 4)24-09 3 2 3 2 – –24-10 3 2-1/2DRAIN VALVE(SEE3NOTE2-1/24)– –REAR OF24-11 3 2-1/2 3 2-1/2 – –BOILER3” x 12” NIPPLE24-12 4 2-1/2 4 2-1/2 3 (2) 3AND BELL REDUCER2312(SEE NOTE 4)Notes:1. All piping is schedule 40.22. Pipe sizes listed are based on a 20° F or 40°F differential (temperature drop).RETURN2BSelect one to match application.RETURN BRANCH3. When specified return piping is less than 3”, install 24-03 3” x 12” THRU nipple 24-11 and (W/20°F appropriate DROP)size bell reducer directly into boiler return tapping as 24-03 shown. THRU 24-12 (W/40°F DROP) 24-12 (W/20°F DROP)4. Drain valve—ball valve preferable, gate valve acceptable alternative(supplied by others).—Minimum valve size per ASME code is 3/4 ” NPT.CLOSELYSPACEDTEESD2RETURNREAR OFBOILER2RETURNRETURN HEADER2ARETU24-03 THRU 24-11 (W/20°F DROP)24-03 THRU 24-12 (W/40°F DROP) 24
3 DIVERTINGVALVE & ACTUATOR1 SUPPLYTEESD1 SUPPLYBOILER CIRCULATOR(BY OTHERS - SEE NOTE 5)DRAIN VALVE(SEE NOTE 4)SEE NOTE 52 RETURNSEE NOTE 63” x 12” NIPPLEAND BELL REDUCER(SEE NOTE 4)24-03 THRU 24-11 (W/20°F DROP)RETURNRecommendation 3 is used when the return water temperature goes below 135°F for prolonged periods SENSOR (SEE NOTE of 7)time. This is also primary-secondary piping, but includes the addition of a 3-way valve, return water sensor andboiler-mounted RTC Return Temperature Control.3 DIVERTINGVALVE & ACTUATOR1 SUPPLYBOILER CIRCULATOR(BY OTHERS - SEE NOTE 5)DRAIN VALVE(SEE NOTE 4)SYSTEMPUMP MAX4D1 SUPPLYREAR OFBOILER24-03 THRU 24-11 (W/20°F DROP)24-03 THRU 24-12 (W/40°F DROP)PIPE SIZING AND NOTES FOR RECOMMENDATION 3RETURN PIPING SIZE (IN)SUPPLY RETURN RETURN PUMPPIPING HEADER BRANCHSIZE (IN) (1) RETURN (2) (2A) (QTY.) 1 SUPPLYSIZE (2B)3 DIVERTINGBOILER 20°F 40°F 20°F 40°F 20°F 20°FVALVE & ACTUATORMODEL DROP DROP DROP DROP DROP DROP1 SUPPLY24-03 2 1-1/2 2 1-1/2 BOILER – CIRCULATOR –24-04 2 1-1/2 2 1-1/2(BY OTHERS - SEE NOTE 5)– –24-05 2 1-1/2 2 1-1/2 –DRAIN VALVE–(SEE NOTE 4)24-06 2-1/2 1-1/2 2-1/2 1-1/2 – –24-07 2-1/2 2 2-1/2 2 – –24-08 2-1/2 2 2-1/2 2 – –24-09 3 2 3 2 –REAR OFBOILER –24-10 3 2-1/2 3 2-1/2 – – 2B24-11 3 2-1/2 3 2-1/2 – –24-12 4 2-1/2 4 2-1/2 3 (2) 3SYSTEMRETURN BRANCHMAX4D24-12 (W/20°F DROP)CLOSELYSPACEDTEESDSEE NOTE 52 RETURNSEE NOTE 63” x 12” NIPPLEAND BELL REDUCER(SEE NOTE 4)2RETURNRETURNSENSOR (SEE NOTE 7)Notes: CLOSELYSPACED1. All piping TEES is schedule 40.D24-03 THRU 24-12 (W/40°F DROP)3 DIVERTINGVALVE & ACTUATOR1 SUPPLYBOILER CIRCULATOR(BY OTHERS - SEE NOTE 5)DRAIN VALVE(SEE NOTE 4)REAR OFBOILER1 SUPPLYREAR OFBOILERSYSTEMPUMP2BRETURN BRANCH24-12 (W/20°F DROP)CLOSELYSPACEDTEESD2. Pipe sizes listed are based on a 20° F or 40°F differential (temperature drop).Select one to match application.3. When specifiedSEEreturnNOTEpiping5is less than 3”, install 3” x 12” nipple and appropriatesize bell reducer directly into boiler return tapping as shown.2 RETURN4. Drain valve—ball valve preferable, gate valve acceptable alternativeSEE NOTE 6(supplied by others).—Minimum valve size per ASME code is 3/4” NPT.5. Maximum linear feet of pipe from 3-way bypass port to sensor location = 11 feet.Bypass line shall be the same diameter as return A.6. Minimum linear feet 2of pipe from point of mixing (where bypass meets return line)to sensor location RETURN = 4 feet.RETURN HEADER7. Install special 3” x 12” nipple with 1/4” NPT side tapping closest to boiler.RETURN 2AWhere applicable,SENSORuse bell reducer to adapt to recommended return pipe size.(SEE NOTE 7)8. Proper boiler circulator sizing is listed in RTC literature.MAX4D2RETURNSEE NOTE 52 RETURNSEE NOTE 62RETURNRETURN HEADERRETURN 2ASENSOR(SEE NOTE 7)Series 24 Minimum Piping Recommendations – Steam Boiler‘A’‘A’1 1 ‘A’18” MIN.‘A’1‘B’1 1 18” MIN.RISER1(SEE NOTE 5) (SEE NOTE 5)‘B’‘A’‘A’RISER2(SEE NOTE 5) (SEE NOTE 5)1 1 218” MIN.12‘B’2RISER(SEE NOTE 5)22(SEE NOTE 5) (SEE NOTE 5)24” MIN.(SEE NOTE 4) (SEE NOTE 4)(SEE NOTE 5)222224” MIN.(SEE NOTE 4) (SEE NOTE 4)SUPPLY242(SEE NOTE 5)224SEE NOTE 2WATER LINESUPPLY424” MIN.(SEE NOTE 4) (SEE NOTE 4)HEADER22(SEE NOTE 4)4SEE NOTE 22” TO 4”BLOW-OFF/ WATER LINEHEADER(SEE NOTE 3)EQUALIZERDRAIN VALVESUPPLY(SEE NOTE 4)442(SEE 2” NOTE TO 3) 4”BLOW-OFF/(SEE NOTE 3)(SEE NOTE 3)43CLOSE NIPPLEQUALIZERSEE NOTE 2DRAIN VALVE4WATER LINEHEADER(SEE NOTE 3)(SEE NOTE 3)(SEE NOTE 4)33HARTFORD LOOP CLOSE NIPPLE2” TO 4”BLOW-OFF/(SEE NOTE 3) 324-03 THRU 24-0624-07 THRU 24-11 (REQ’D ON GRAVITYEQUALIZERDRAIN VALVE4REAR OF BOILER(SEE NOTE HARTFORD 3) LOOP(SEE NOTE 3)RETURN SYSTEM) 324-03 3 THRU 24-0624-07 THRU 24-11 (REQ’D ON GRAVITY CLOSE NIPPLEREAR OF BOILER3RETURN SYSTEM)HARTFORD 3 LOOP DRAIN VALVERETURN24-07 THRU 24-11 (REQ’D ON GRAVITY (WET RETURN)REAR OF BOILERDRAIN VALVERETURN 24-12 SYSTEM) 3 (WET RETURN)RETURN 24-1224-03 THRU 24-06RISERPIPING SIZE (IN)SPACING (IN)RISER HEADERBOILER (QTY.) & SUPPLY RETURN EQUALIZERMODEL SIZE (1) (2) (3) (4) ‘A’ ‘B’24-03 (1) 3” 3” 1-1/2” 2” – –24-04 (1) 4” 4” 2” 2” – –24-05 (1) 4” 4” 2” 2” – –24-06 (1) 4” 4” 2-1/2” 2-1/2” – –24-07 (2) 4” 6” 2-1/2” 2-1/2” 36” –24-08 (2) 4” 6” 2-1/2” 2-1/2” 42” –24-09 (2) 4” 6” 2-1/2” 2-1/2” 48” –24-10 (2) 4” 6” 3” 3” 54” –24-11 (2) 4” 6” 3” 3” 60” –24-12 (3) 4” 6” 3” 3” 30” 36”Notes:1. All piping is schedule 40.2. To prevent condensate from being trapped in header, do not reduce equalizer elbow at headerconnection.3. Drain/blowoff valve—ball valve preferable, gate valve acceptable alternative (supplied by others).• Mininim valve size per ASME code is 3/4” NPT 24-03/24-05; 1” NPT 24-06/24-10;1-1/4” NPT 24-11/24-12.• Increasing the valve size will improve the blowdown operation• In all cases, piping connection blowoff valve to boiler should be full size to the point of discharge.4. For pumped return systems, see Series 24 installation manual.24-12DRAIN VALVE(WET RETURN)
Page 5: Commercial Hot Water or Steam Boile

Crown Boiler Series 24 Commercial Boilers - LSKair

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