Crown Boiler 24-06, 24-11, 24-10, 24-08, 24-12, 24-05, 24-09, 24-03, 24-04 Parallel Piping Conversion

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Figure 27:

Typical Crown Boiler - Primary - Secondary Loop System (Return Temps always Greater than 135°F.)

Figure 28:

Typical Crown Boiler Loop w/3-way Diverting Valve, Where System Return may be Less than 135°F.

Figure 30: Parallel Piping Conversion

of the RTC cannot be used on multiple boiler installations.

d.Boiler Circulator – The boiler circulator selection will maintain a constant and minimum flow through the boiler during every heat demand.

In addition, the circulator will maintain a flow around the return sensor. The circulator must be properly selected, based on the design temperature between the boiler supply and boiler return. Appendix B lists the appropriate pumps for both 20 ºF and 40 ºF applications. A boiler circulator must be used with and without an RTC System for a primary/secondary piping arrangement.

WARNING

If the boiler circulator you have selected is greater than 1/3 HP, an isolation relay must be added when using the RTC.

If a 3-phase boiler circulator has been selected than a properly sized motor starter must be installed when using the RTC.

e.Diverting Valve – A diverting 3-way valve must be part of the boiler loop for boiler protection to be active when using the RTC. Only a Crown approved valve and actuator may be used for boiler protection. The valve sizing does change based on the designed boiler ∆T, since the flow rate and the pressure drop change for each. See Appendix B for proper valve selection.

f.Glycol Antifreeze Solutions - Many systems today use ethylene or propylene glycol antifreeze solutions as a measure for freeze protection, as well as a pump lubricator and corrosion inhibitor. The properties of the glycol mixture have an impact on valve and pump sizing. All glycol solutions have a lower specific heat than water. This means that the glycol solution cannot transfer heat as well as pure water, resulting in the need for higher flow rates. In addition, the viscosity of the glycol solution is usually higher than water, requiring a higher pump head for the same given flow. Consult factory for specific applications, pump selection and flow rate.

g.Nipple and Sensor - The 3 x 12 special nipple must be installed in the lower right return connection when looking at the rear section, when using the RTC. Insert the return sensor using pipe dope.

2.STEAM HEATING, consult I=B=R Installation and Piping Guide No. 200. For piping details, see Figure 34. Figure 35 shows a typical pumped return/ boiler feed unit arrangement. Figure 36 illustrates the required mounting elevations for McDonnell and Miller 150 and 63 float low water cut-offs.

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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 Burner Installation Water Boilers Install Water TrimBoiler 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
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