Crown Boiler 24-11, 24-10, 24-12, 24-06, 24-05, 24-03 Schematic Tankless Heater Piping 24-08 24-09

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Figure 37: Minimum Piping Requirements for Series 24 Tankless Heater Manifolds

		Table IV Tankless Heater Ratings
		Boiler	Number of T-4 Tankless Heaters
		Boiler		Installed
		Model	1	2	3	4
			1	2	3	4
		24-03	6.75	---	---	---
		24-04	7.5	---	---	---
		24-05	7.5	---	---	---
		24-06	7.5	15	---	---
		24-07	7.5	15	---	---
	Figure 38: Schematic Tankless Heater Piping	24-08	7.5	15	---	---
	Figure 38: Schematic Tankless Heater Piping	24-09	7.5	15	22.5	---
		24-09	7.5	15	22.5	---
		24-10	7.5	15	22.5	---
		24-11	7.5	15	22.5	---
		24-12	7.5	15	22.5	30
		Notes:

1. Ratings are given in gallons per minute continuous ﬂow of water heated from 40°F to 140°F with 200°F boiler water.

2. For tankless heater quantities less than maximum allowable, it is important that water heaters be centrally located in the boiler.

See Figure 8 for appropriate locations.

3. Tankless heater pressure drop is 5.5 PSI at

7.5 GPM.

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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 Section I General Information Locate the UnitBoiler Foundation Chimney or VentVents Faults & Suggestions Section II Cast Iron Block Assembly Assembly of Sections Manual DRAW- UPNipple 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 Section III Installation Instructions Canopy with Rear Flue Outlet Damper AssemblyBare Boiler Assembly Avoid Breathing Fiber Particulates and Dust Left Side Canopy Intermediate Bracket Mount Rear Observation Port Cover Refer to Figure Inspect ALL Boiler SealsSeries 24 Jacket Assembly Boiler Models 24-03 thru Burner Mounting Plate Refer to Figures 16 Mount Burner Adapter Plate to Burner Mounting PlatePurpose of Tappings Steam Boilers Steam Trim Steam Boilers Install Steam Trim This Is Intentionally Left Blank Purpose of Tappings Water Boilers Water Trim Water Boilers Install Water Trim Burner InstallationBoiler Piping Heating Applications 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 Return Temperature Control and Components CCW Open to SystemWater Boiler Pressure Relief Valve Hook-Up Typical Boiler Wiring with RTC Front Typical Boiler with RTC Return Sensor Rear Starting Burner Always Inspect Installation BeforeSection IV Operating Instructions Fill Heating System with WaterFlame Failure Boil MIN Delay Test Controls Check Operation of High Limit ControlBoiler and System Cleaning Steam Boiler Boiler and System Cleaning Water Boilers Frequent Water Addition Oxygen CorrosionSection V Service Instructions Clean the Boiler FluewaysMaintenance of LOW Water Cutoff Devices General Maintenance Considerations OperationSection VI Burner Specifications OIL BurnersSection 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 Appendix C Valve and Actuator Mounting Instructions ApplicationService Record PN 980417 S24 12/05