Manuals / Roberts Gorden / Household Appliance / Gas Heater

Roberts Gorden CRV-B-9 service manual

Models: CRV-B-9

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SECTION 10: ROBERTS GORDON® ULTRAVAC™ DESIGN REQUIREMENTS

CRV-B-2 and CRV-B-4 are not available for use with

ROBERTS GORDON® ULTRAVAC™ controls.

CRV-Series systems designed with minimum radiant tube lengthshall have 1.5' - 2.0' per flow unit of tailpipe length.

-OR-

CRV-Series systems with recommended radiant tube length shall have 1.2' - 1.5' per flow unit of tailpipe length.

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Contents

CoRayVac Design ManualGas-Fired, Low-Intensity Custom EngineeredPage 2012 Roberts-GordonLLC TABLE OF CONTENTSPage LIST OF TABLES TABLE OF FIGURESPage SECTION 1 CONCEPT SECTION 2 THE CRV-SERIESSYSTEM 2.1 Safety2.2 Zero Regulator 1. Radiant tubing between burners, and 20-50 6-15m downstream of the last burner is normally hot rolled steel or heat-treatedaluminized steel. All tailpipe tubing must be por- celain coated steel or heat-treatedaluminized steel 2.3 Fuel Savings and Comfort clearances to combustibles at all times for safety Fire Hazardinches FIGURE 2: STANDARD REFLECTORcentimeters FIGURE 3 ONE SIDE REFLECTORinches FIGURE 5 UNIVERSAL SHIELD, POSITIONcentimeters inchesFIGURE 9 BARRIER SHIELD FIGURE 8 2-FOOTDECO GRILLEFIGURE 10 PROTECTIVE GRILLE inches4.2 Radiant Height Adjustment Factor 4.1 Radiant Adjustment to Heat LossSECTION 4 SIZING AND DESIGN CONSIDERATIONS EXAMPLE4.4 Radiant Distribution 4.3 Selecting the Burners4.4.1 Radiant Distribution Average Coverage 4.4.2 Radiant Distribution Increased CoverageFIGURE 13 Radiant Distribution Heavy Coverage FIGURE 11 Radiant Distribution Average Coverage5.1 Radiant Branch Flow SECTION 5 FLOW LOADINGFIGURE 14 Burner Flow Units FIGURE 15 Vacuum Loss Curve for 4 Shared 5.2 Pump CapacityTailpipe 5.3 Tailpipe Flow6.1 Radiant Tube Length SECTION 6 RADIANT TUBE AND TAILPIPE6.1.1 Minimum Radiant Tube Length 6.1.2 Maximum Radiant Tube Length6.3 Design Parameters FIGURE 16 Tube Length vs. EfficiencyPump Model Series Maximum Loading 6.4CRV-SeriesDesign MethodsAfter Each Burner 6.5 Tailpipe Design Method EXAMPLE 3 B-10Radiant Tube vs. Tailpipe Length6.5.1 Rule of Thumb Unshared Calculations System with EP-300Series Pump6.5.5 Damper Couplings FIGURE 17 Possible Damper Coupling Locations FIGURE 18 Example System Layout Option SECTION 7 EXAMPLE CRV-SERIESSYSTEM LAYOUTS7.1 Example System Layout Option 7.2 Example System Layout Option FIGURE 19 Example System Layout OptionFIGURE 20 Example System Layout Option 7.3 Example System Layout OptionFIGURE 22: Example System Layout Option FIGURE 21 Example System Layout Option7.4 Example System Layout Option 7.5 Example System Layout Option7.6 Example System Layout Option FIGURE 23 Example System Layout OptionFIGURE 24 Example System Layout Option FIGURE 25 Example System Layout Option7.7 Example System Layout Option 7, 8 and FIGURE 26: Example System Layout OptionTurn off gas supply to heater before service Disconnect electric before service or maintenanceSECTION 8: CONTROL METHODS Electrical Shock Hazard8.3.3Analog signal Modulating with BACnet 8.3.1 Analog Signal Modulating ThermostatMS/TP Wiring 8.6 Pressure Switch9.1 Pressurized SECTION 9 AIR SUPPLY SYSTEM9.2 Non-Pressurized 9.3.2 Pressurized SystemsDuct Design Rules 9.3.3 Pipe sizingBlower P/N 90707501K Performance 112 Flow Units FIGURE 28: Outside Air BlowerBranch B Branch ABranch C Page 11.1 Burner and Burner Controls SECTION 11 CRV-SERIESEQUIPMENT SPECIFICATIONS11.2Equipment 11.2.1 Burner 11.2.2 Pump