Raypak 503-2003 manual Hydronic Heating, Pump Selection, Feedwater Regulator, Cold Water Starts

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longer than 7 minutes or where cold water operation is continuous, provisions must be made to mix higher temperature outlet water with the colder inlet water and thereby raise the inlet temperature to at least 120°F (49°C) within the 7-minute time limit.

Cold Water Starts

Cold water starts, where the inlet water temperature remains below 120°F (49°C) for more than 7 minutes, must have cold water start protection. Known pro- tection methods consist of mixing heated outlet water with the inlet water using a bypass to raise the inlet to 120°F (49°C) or higher. Once the system is heated up and has return water temperatures of 120°F (49°C) or higher, the mixing of outlet water with inlet water is no longer needed and the bypass can be shut off. If the bypass is not shut off as the system heats up, the out- let temperature may continue to climb and trip the high limit, thereby shutting down the heater. Thus an auto- matic valve system, such as a three-way proportional valve to control the bypass, should be used.

*

*Maximum 4 times the pipe diameter or 12”, whichever is less.

Fig. 9: Cold Water Start

Cold Water Run

Cold water run differs from cold water start in that the system water entering the heater remains below 120°F (49°C) continuously. Typically, this is the case in swimming pool heating and water source heat pump applications as well as some others. If the system

water is kept in a narrow temperature range of no more than 10°F (5°C), a permanent manual bypass can be employed and manually adjusted to achieve an inlet temperature of 120°F (49°C) or higher as adjust- ed at the minimum temperature in this narrow temperature range (i.e. Range 75°F to 85°F, adjust bypass with temperature at 75°F (24°C)) so that when temperature is 85°F (29°C), minimum inlet tempera- ture would be 130°F (54°C). An injector pump arrangement may also be utilized to keep the heater loop at or above 120°F (49°C). An injector pump approach has the added value of being able to adjust to changes in the system water coming back to the heater take-off.

*

*Maximum 4 times the pipe diameter or 12”, whichever is less.

Hydronic Heating

Pump Selection

In order to ensure proper performance of your heater system, you must install a correctly-sized pump. Ray- pak requires designing for a ∆T within the range of 10°F to 40°F (5°C to 20°C). See Table F for accept- able flow rates for each model (∆T is the temperature difference between the inlet and outlet water when the heater is firing at full rate).

Feedwater Regulator

Raypak recommends that a feedwater regulator be in- stalled and set at 12 psi minimum pressure at the highest point of the system. Install a check valve or back flow device upstream of the regulator, with a manual shut-off valve as required by local codes.

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Contents Do so may result in an explosion or fire Reference Catalog no .53G Effective Replaces 241288 RevPage Contents Pay Attention to These Terms Product Receipt Before InstallationInstallations at Elevation Model IdentificationComponent Locations General InformationWater Time to Produce Serious Temp Burn General SafetyTime/Temperature Relationships in Scalds Indoor Installations InstallationInstallation Codes Equipment BaseIndoor Units Outdoor InstallationsCombustion and Ventilation Air Table E Vent/Air Inlet Termination Clearances Air Filter InstallationsConventional Combustion Air Supply Direct VentGeneral Canadian InstallationsWater Piping Cold Water Operation Relief Valve Piping Temperature & Pressure GaugeHydrostatic Test Feedwater Regulator Hydronic HeatingPump Selection Cold Water StartsModel 20F 30F 40F Min. Flow Max. Flow Gpm PipingAir-Separation/Expansion Tank Potable Water and Space Heating Three-Way ValvesDomestic Hot Water Pool HeatingMake final adjustments when pool water approaches Exceed 5 ppm Pool/Spa Water ChemistryWinterizing Your Heater Gas Supply Pressure Gas SupplyGas Supply Connection Automatic Chlorinators Chemical FeedersManifold Gas Pressure Model Electrical Power ConnectionsModel In. NPT 4 in. NPT 2 in. NPT High Fire ValuesMaking the Electrical Connections Check the Power SourceField-Connected Controllers Appliance Categories Field Wiring ConnectionVenting Vent Terminal Location InstallationsSupport of Vent Stack Canadian Installations Venting Installation TipsVenting Configurations InstallationTermination CpvcVent VolumeCommon Venting Model Pressure Flue ProductsHorizontal Through-the-Wall Direct Venting Category Horizontal Through-the-Wall VentingCombustion Air Air Inlet Horizontal Max. Length** ft Vent Direct Vent-VerticalModel Certified 10 ØOutdoor Installation Operating Modes ControlsFreeze Protection Mode 2 Primary/Secondary Piping Mode 7 Primary/Secondary Piping with External Target Temp 10 VDC 20 mA Boiler Target Modes Default Setting Range10 VDC 20 mA Definitions Rank Number Field Type Fault DescriptionOperation Ignition Module High Limit-Manual ResetHeater Sequence of Operation Code ConditionFlow Switch High Limit-Auto Reset OptionalModulating Temperature Control High & Low Gas Pressure Switches OptionalUDB Diagnostic Board Air Pressure SwitchBlocked Vent Switch Wiring Diagrams Models Models Pre Start-up Check START-UPPre Start-up Initial Start-upBlower Check PreparationStart-Up Model Amp Draw Setting Safety InspectionModel Air Pressure Setting Setting in. WC Manifold CheckLeak Test Procedure Dual-Seat Gas Valve Follow-UpPost Start-Up Check OperationLighting Instructions To Turn Off Gas To Appliance Troubleshooting StepSuggested Minimum Maintenance Schedule MaintenanceUDB Fault History Weekly Preventive Maintenance SchedulePeriodically Semi-AnnuallyAs Required Filter MaintenanceFilter Replacement Appendix Inside Air ContaminationImportant Instructions for the Commonwealth of Massachusetts Limited Parts Warranty MVB Types H and WH START-UP Checklist for FAN-ASSISTED Raypak Products
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503-2003 specifications

The Raypak 503-2003 is a notable entry in the world of water heating solutions, renowned for its efficiency and reliability in both residential and commercial settings. This model is designed to provide exceptional performance while maintaining ease of use and minimization of environmental impact.

One of the standout features of the Raypak 503-2003 is its advanced heating technology. The unit utilizes a durable, copper heat exchanger which ensures quick and efficient heating of water. This heat exchanger is known for its ability to transfer heat effectively, leading to reduced energy consumption and lower utility bills. The design also allows for a seamless operation, ensuring that the system heats water swiftly without sacrificing performance.

In addition to its efficient heating capabilities, the Raypak 503-2003 is equipped with innovative controls. The digital control panel allows users to easily set and adjust the desired water temperature. This feature provides a level of convenience that simplifies operation while enhancing user experience. Furthermore, the smart technology employed in the unit ensures that it operates within optimal parameters, avoiding unnecessary energy expenditure.

Durability is another hallmark of the Raypak 503-2003. Built with heavy-duty components, this water heating solution is designed to withstand the rigors of continuous use. The rugged construction ensures longevity, making it a cost-effective investment for homeowners and businesses alike. Moreover, the unit is designed to be resistant to corrosion and wear, further extending its lifespan and reliability.

The energy efficiency of the Raypak 503-2003 is a crucial characteristic that sets it apart from competitors. Rated with a high efficiency score, this model contributes to lower emissions and is environmentally friendly. It adheres to various energy standards, making it a suitable choice for those looking to reduce their carbon footprint while enjoying reliable water heating.

Noise reduction is another important feature of the Raypak 503-2003. Designed with quiet operation in mind, the unit operates with minimal noise pollution, allowing for a pleasant environment in both residential and commercial spaces.

In summary, the Raypak 503-2003 combines advanced heating technology, user-friendly controls, durability, and energy efficiency into a robust water heating system. This makes it an excellent choice for those in need of dependable and sustainable heating solutions. Whether for daily home use or for larger commercial applications, the Raypak 503-2003 stands out as a leader in its class.
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