Crown Boiler 24-05, 24-11, 24-10, 24-08, 24-12, 24-06, 24-09, 24-03, 24-04 Recommendation 1 Use when

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Recommendation 1 — Use when:

•system return water is not less than 135° F for prolonged periods of time

•system ﬂow does not impact ﬂow through the boiler

Pipe Sizing and Notes

	SUPPLY				RETURN PIPING SIZE (IN)
	SUPPLY
	PIPING					RETURN	RETURN
	SIZE (IN)					HEADER	BRANCH
		(1)		RETURN (2)		(2A)	(QTY.) SIZE (2B)
	20°F		40°F	20°F	40°F	20°F	20°F
MODEL	DROP		DROP	DROP	DROP	DROP	DROP
24-03	2		1-1/2	2	1-1/2	—	—	NOTES:
24-04	2		1-1/2	2	1-1/2	—	—	NOTES:
24-05	2		1-1/2	2	1-1/2	—	—	1.All piping is schedule 40.
24-06	2-1/2		1-1/2	2-1/2	1-1/2	—	—	2.Pipe sizes listed are based on a 20°F or 40°F differential (temperature drop).
24-07	2-1/2		2	2-1/2	2	—	—	Select one to match application.
24-08	2-1/2		2	2-1/2	2	—	—	3.When speciﬁed return piping size is less than 3”, install 3” X 12” nipple and appropriate
24-09	3		2	3	2	—	—	size bell reducer directly into boiler return tapping as shown.
24-10	3		2-1/2	3	2-1/2	—	—	4.Drain valve — ball valve preferable, gate valve acceptable alternative
24-11	3		2-1/2	3	2-1/2	—	—	(supplied by others).
24-12	4		2-1/2	4	2-1/2	3	(2) 3	- Minimum valve size per ASME code is 3/4” NPT.

Figure 31: Series 24 Minimum Piping Recommendation 1 - Water Boiler

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Contents Series Page Important Information Read Carefully Page Page Table of Contents Table of Contents Section I General Information Boiler RATINGS/DATA Locate the Unit Section I General InformationChimney or Vent Boiler FoundationVents Faults & Suggestions Assembly of Sections Manual DRAW- UP Section II Cast Iron Block AssemblyNipple Gauge Series 24 Section Arrangement Draw-Up Rods Alternating Pattern Manual Draw-up Center Section Channel Block Position Partial Block Draw-Up Hydraulic Draw-Up of Sections Canopy with Rear Flue Outlet Damper Assembly Section III Installation InstructionsBare Boiler Assembly Avoid Breathing Fiber Particulates and Dust Left Side Canopy Intermediate Bracket Inspect ALL Boiler Seals Mount Rear Observation Port Cover Refer to FigureSeries 24 Jacket Assembly Boiler Models 24-03 thru Mount Burner Adapter Plate to Burner Mounting Plate Burner Mounting Plate Refer to Figures 16Purpose of Tappings Steam Boilers Steam Trim Steam Boilers Install Steam Trim This Is Intentionally Left Blank Purpose of Tappings Water Boilers Water Trim Boiler Piping Heating Applications Water Boilers Install Water TrimBurner Installation Page Parallel Piping Conversion Recommendation 1 Use when Recommendation 2 Use when Recommendation 3 Use when Page Page Page BMounting Elevations M&M 150, 64 Float Low Water Cut-offs Schematic Tankless Heater Piping 24-08 24-09 CCW Open to System Return Temperature Control and ComponentsWater Boiler Pressure Relief Valve Hook-Up Typical Boiler Wiring with RTC Front Typical Boiler with RTC Return Sensor Rear Fill Heating System with Water Always Inspect Installation BeforeSection IV Operating Instructions Starting BurnerFlame Failure Boil MIN Delay Check Operation of High Limit Control Test ControlsBoiler and System Cleaning Steam Boiler Boiler and System Cleaning Water Boilers Oxygen Corrosion Frequent Water AdditionClean the Boiler Flueways Section V Service InstructionsMaintenance of LOW Water Cutoff Devices Operation General Maintenance ConsiderationsOIL Burners Section VI Burner SpecificationsSection VII Repair Parts & Carton Contents Series 24 Master Parts List Section VII Repair Parts Jacket Carton Bare Boiler Assembly Section Joiner Carton Assy Rear Target Wall Carton Standard Steam Trim Carton Assy RTC Carton with Outdoor Reset Tankless Coil Components Boiler Water Section Viii Appendix Page Mechanical Page Mechanical Electrical Page Page Page Page Page Page Page Page Series 24 Boiler Circulator Selection Taco 20F Differential Boiler Recirculation Grundfos Circulating Pump Way Boiler Recirculation Bell and Gossett Circulating Pump Way Boiler Recirculation Armstrong Circulating Pump Way Application Appendix C Valve and Actuator Mounting InstructionsService Record PN 980417 S24 12/05