Raypak 751 manual Pump Turn-off Delay, Blower Fan Pre-purge, Blower Fan Post-purge

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Fig. 30: CPW Board

Pump Turn-off Delay

The CPW board has a built-in pump driver with pump turn-off delay, which allows the operator to set how long the pump will run after the boiler shuts off. The delay is factory-set for 7 minutes but can be field- adjusted from 3 minutes to 10 minutes. The pump relay can directly power a pump of up to 12.0 amps draw or 3/4 hp capacity. Pumps with larger amp draws should be energized through a pump contactor that is controlled by the CPW board.

By properly setting the pump turn-off delay, the boiler pump will continue running for a limited period of time in order to extract any residual heat from the combus- tion chamber. The pump will then shut off to conserve energy until the next call for heat.

The pump-off time delay should be set to the minimum time required to extract all residual heat from the heat exchanger. If temperature as monitored at the boiler outlet increases more than 5°F after the pump turns off following a firing cycle, the pump-off time delay should be extended by thirty seconds. Increase or decrease time delay as appropriate until outlet temperature does not spike more than 5°F after pump shut-off following a prolonged firing cycle (> 5min.)

CAUTION: The boiler requires forced water circulation when the burner is operating and the pump must be interlocked with the boiler. See the Water Piping section for minimum and maximum water flow rates and pump selection.

NOTE: Pump will come on when power is first applied to the boiler.

Blower Fan Pre-purge

The CPW board has a built-in pre-purge delay which operates the blower fan for a user-adjustable time period prior to pilot trial for ignition. The pre-purge peri- od ensures that the combustion chamber is clear of all excess combustible gases prior to commencing the pilot ignition cycle. The pre-purge delay is factory set for 45 seconds and it can be adjusted in the field from 45 seconds to 120 seconds. To optimize boiler response time on call-for-heat, set the pre-purge delay to the minimum allowed by local, state or national code.

Blower Fan Post-purge

The CPW board has a built-in post-purge delay to exhaust residual combustion products after the main gas valve closes. The post-purge timing is factory set at 3 minutes and is not field-adjustable.

Freeze Protection Feature

The CPW board is programmed to turn-off the blower in case there is a lock-out condition. If there is a call for heat signal, and the pilot valve signal is removed and not reactivated within a pre-set time for any reason, the CPW board will turn off the blower to prevent blow- ing cold air continuously and freezing the heat exchanger. The blower drives will open and the system will lock in the off state.

To restart the system, primary power or the thermostat signal must be turned off and back on. The pre-set freeze protection feature time is approximately 5 min- utes.

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Contents Advanced Design Boiler Page Contents Pay Attention to These Terms Product Receipt Before InstallationInstallations at Elevation Model IdentificationComponent Locations Component LocationsGeneral Safety Time/Temperature Relationships in ScaldsIndoor Installations InstallationInstallation Codes Equipment BaseIndoor Units Outdoor InstallationsCombustion and Ventilation Air Direct VentInstallations1 Canadian Installations2 Installations Canadian InstallationsConventional Combustion Air Supply Water Piping Low Temperature SystemTemperature & Pressure Gauge GeneralHydronic Heating Single Boiler Primary/Secondary Piping Dual Boiler Piping Domestic HOT Water Piping Single Boiler Domestic Hot Water with One Storage Tank Page Winterizing Your Heater Pool HeatingAutomatic Chlorinators and Chemical Feeders Pool and Spa Water ChemistrySingle Boiler Pool Application GAS Supply Connections Double Boiler Pool ApplicationGas Supply Connection Gas Supply PressureElectrical Power Connections Field Wiring Connections Electrical Connections Domestic Hot WaterVenting Connections General Definition of Appliance CategoriesVent Terminal Location Venting Installation Tips Venting ConfigurationsADB-1501 Natural Draft Vertical Venting System Installation Natural Draft Vertical Vent TerminationADB-1501 Horizontal Thru-wall Direct Vent Termination Horizontal Thru-Wall Direct Venting/Combustion Air CategoryÁDB-1501 Vertical Direct Venting/Combustion Air Category Vertical Direct Venting System Installation Vertical Direct Vent TerminationContact the manufacturer for details Horizontal Thru-wall Venting System Category IV Installation PVC, ABS Page Galvanized ADB-751 Venting Material e.g Subtract 10 ft per Condensate Drain Condensate Trap AlignmentCentral Point Wiring CPW ControlsCPW Board Blower Fan Pre-purge Pump Turn-off DelayFreeze Protection Feature Blower Fan Post-purgeDiagnostics Board Light Color IndicationWiring Diagram Figure L-2High Limit Auto Reset Flow SwitchHigh Limit Manual Reset Ignition Control ModuleLow Water Cut Off Optional High and Low Gas Pressure Switches Manual ResetPRE-START-UP Fill the SystemPre-Start-up Check Blower T Fitting DetailADB Initial START-UP Tools NeededPreparation for Start-up Page Post START-UP Check Main Burner AdjustmentSafety Inspection Follow-upOperation MaintenanceSuggested Minimum Maintenance Schedule Operating InstructionsDaily Connecting the Condensing Heat Exchanger CHXCleaning Boiler Heating Surfaces MonthlyVent Switch Adjustment Connecting Add-on Condensing Heat Exchanger to ADBAppendix Inside Combustion Air ContaminationEmissions Settings and Test Information Bluff Head Body Burner Warranty

751 specifications

The Raypak 751 is a high-efficiency, gas-powered pool and spa heater renowned for its advanced technology and durability. Designed with innovative features, the Raypak 751 prioritizes user convenience and energy efficiency, making it an excellent choice for pool owners seeking reliable heating solutions.

One of the standout features of the Raypak 751 is its robust heat exchanger, built from the finest materials to ensure long-lasting performance. This model utilizes a copper heat exchanger which is highly conductive, allowing for rapid heating of water and maintenance of consistent temperatures. Its design also minimizes scale buildup, extending the longevity of the heater.

The Raypak 751 is equipped with advanced digital controls that make it user-friendly. The intuitive interface allows for precise temperature settings and monitoring, ensuring optimal performance. Additionally, the heater features a temperature display that provides real-time updates, giving users peace of mind when adjusting their pool's environment.

Energy efficiency is a hallmark of the Raypak 751, thanks to its low NOx burner technology. This feature meets stringent environmental regulations while also lowering operational costs. By optimizing fuel usage, the heater not only contributes to reducing greenhouse gas emissions but also provides a more economical heating option for pool and spa owners.

The rugged construction of the Raypak 751 is another characteristic that sets it apart. Its heavy-duty cabinet is designed to withstand the elements, ensuring reliable operation in various weather conditions. The heater is available in multiple configurations, including both natural gas and propane options, allowing for flexible installation depending on the user's needs.

Furthermore, the Raypak 751 incorporates safety features, such as an integrated pressure switch that prevents operation when water flow is insufficient. This protects both the heater and associated plumbing from damage due to overheating or dry firing.

In summary, the Raypak 751 combines cutting-edge technology with user-centric features to deliver a superior pool heating experience. Its high-efficiency performance, durable construction, and advanced safety features make it a top choice for anyone looking to enhance their pool or spa. Whether for residential or commercial applications, the Raypak 751 ensures warmth and comfort, enriching the overall swimming experience.