Raypak 302A-902A manual Gas Supply, Pool/Spa Water Chemistry Water Hardness, PH of Water

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shut-off. Close isolation valves and remove water pip- ing from the in/out header on the heater. Drain the heater and any piping of all water that may experience below-freezing temperatures.

Pool/Spa Water Chemistry

NOTE: Chemical imbalance can cause severe dam- age to your heater and associated equipment.

Water Hardness

Water hardness is mainly due to the presence of cal- cium and magnesium salts dissolved in the water. The concentration of these salts is expressed in mg/l, ppm or grains per gallon, as a measure of relative hardness of water. Grains per gallon is the common reference measurement used in the U.S. water heater industry. Hardness expressed as mg/L or ppm may be divided by 17.1 to convert to grains per gallon. Water may be classified as very soft, slightly hard, moderately hard or hard based on its hardness number. The salts in water will precipitate out when the water is heated and will cause accelerated lime and scale accumulation on a heat transfer surface.

Raypak water heaters can operate lime/scale-free using potable water with a hardness not exceeding 25 grains per gallon. Proper operation is achieved by set- ting the temperature rise/water flow per the guidelines in the installation instructions. If the hardness of the water exceeds the maximum level of 25 grains per gal- lon special measures must be taken to adjust flow and temperature rise. Water should be softened to a hard- ness level no lower than 5 grains per gallon. Water softened as low as 0 to 1 grain per gallon may be under-saturated with respect to calcium carbonate resulting in water that is aggressive and corrosive.

pH of Water

pH is a measure of relative acidity, neutrality or alka- linity. Dissolved minerals and gases affect water’s pH. The pH scale ranges from 0 to 14. Water with a pH of

7.0is considered neutral. Water with a pH lower than 7 is considered acidic. Water with a pH higher than 7 is considered alkaline. A neutral pH (around 7) is desir- able for most potable water applications. Corrosion damage and water heater failures resulting from water pH levels of lower than 6 or higher than 8 are non-war- rantable. The ideal pH range for water used in a stor- age tank or a copper water heater system is 7.2 to 7.8.

Total Dissolved Solids

Total dissolved solids (TDS) is the measure of all min- erals and solids that are dissolved in the water. The concentration of total dissolved solids is usually ex- pressed in parts per million (ppm) as measured in a water sample. Water with a high TDS concentration will greatly accelerate lime and scale formation in the hot water system. Most high TDS concentrations will precipitate out of the water when heated. This can generate a scale accumulation on the heat transfer surface that will greatly reduce the service life of a water heater. This scale accumulation can also impede adequate flow of water and may totally block the water passages in the tubes of the heat exchang- er. A heat exchanger that is damaged or blocked by lime/scale accumulation must be replaced. Failure of a water heater due to lime scale build up on the heating surface is non-warrantable. The manufacturer of the water heater has no control of the water quality, espe- cially the TDS levels in your system. Total dissolved solids in excess of 2,500 ppm will accelerate lime and scale formation in the heat exchanger. Heat exchang- er failure due to total dissolved solids in excess of 2,500 ppm is a non-warrantable condition. Raypak offers basic temperature guidelines for operation of a potable water heater on normal to moderate levels of hardness and solids but levels of hardness and total dissolved solids beyond normal limits for operation will require special setup and operation.

NOTE: Failure of a heat exchanger due to lime scale build-up on the heating surface, low pH or other chemical imbalance is non-warrantable.

Gas Supply

DANGER: Make sure the gas on which the heater will operate is the same type as specified on the heater’s rating plate.

Gas piping must have a sediment trap ahead of the heater gas controls, and a manual shut-off valve lo- cated outside the heater jacket. It is recommended that a union be installed in the gas supply piping adja- cent to the heater for servicing. A pounds-to-inches regulator must be installed to reduce the gas supply pressure to a maximum of 10.5 in. WC for natural gas and 13.0 in. WC for propane gas. The regulator should be placed a minimum distance of 10 times the pipe diameter up-stream of the heater gas controls. Refer to Table J for maximum pipe lengths.

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Contents Installation and Operating Instructions Page Contents Pay Attention to These Terms Before Installation Product ReceiptModel Identification Ratings and CertificationsComponent Locations Component Locations BackModel # Burners Valve Firing Per Valve Staging General InformationModel # Burners per Stages Fire at Valve Water Time to Produce Serious Temp Burn General SafetyTime/Temperature Relationships in Scalds Installation Installation CodesEquipment Base StackingClearances Indoor InstallationsOutdoor Installations Installations1 Canadian Installations2 Combustion and Ventilation Air Indoor UnitsReversing Air Filter Direct VentInstallations Conventional Combustion Air SupplyTruSeal Combustion Air All Air from Inside the BuildingCanadian Installations Water PipingGeneral Reversing Water ConnectionsRelief Valve Piping Hydrostatic Test Cold Water OperationTemperature & Pressure Gauge Hydronic HeatingPump Selection Min. Flow Max Flow GpmPressure Drop in Feet of Head Feedwater Regulator PipingAir-Separation/Expansion Tank Three-Way ValvesPotable Water and Space Heating Pool HeatingAutomatic Chlorinators and Chemical Feeders Winterizing Your HeaterGas Supply Pool/Spa Water Chemistry Water HardnessPH of Water Total Dissolved SolidsTable J Maximum Equivalent Pipe Length Gas Supply ConnectionReversing Gas Supply Connection Electrical Power Connections Check the Power SourceGas Supply Pressure Field-Connected ControllersField Wiring Connection Making the Electrical ConnectionsWiring Connections Venting Appliance CategoriesSupport of Vent Stack Vent Terminal LocationDirect Venting Horizontal Through Stainless SteelChanging the Flue Outlet InstallationsCanadian Installations Venting Installation Tips Venting ConfigurationsInstallation Natural Draft Vertical Venting CategoryTermination Common Venting SystemModel Venting Vent Size Height Intake Pipe Max. Length Min MaxHorizontal Through-the-Wall Venting Category Horizontal Through-the-Wall Venting CategoryMaterial Direct Vent Horizontal Through- the-WallMax. Length Venting Vent Size Equivalent Intake Pipe Direct Vent Vertical Freeze Protection Outdoor InstallationControls Heater Sequence of Operation Models 302A, 402A, 502A, 652A, 752A and 902AInternal Lights Color Indication Auto Reset High Limit Red Auto reset optionExternal Lights Color Indication Ignition Module Code ConditionHigh Limit Manual Reset Flow SwitchHigh and Low Gas Pressure Switches Operating ControlHigh/Low Gas Pressure Switch 87%-Efficiency Boilers Special Instructions Water Piping Venting Appliance CategoriesModel 10F 20F 30F Min. Flow Max Flow Gpm Direct Venting Horizontal Through AL29-4CCondensate Management Vertical Venting CategoryVent Terminal Location Certified Maximum Combustion Air Air Inlet Model Venting Material Vent Length100’ Ducted 40’ 752AE Combustion Air 902AE 30’ 80’Direct Vent Horizontal Through- the-Wall Direct Vent Vertical Certified Vertical Venting Combustion Air Air Inlet302A 100’ 402A Galvanized Steel 502A 75’ Category 25’ 100’ 40’ 752A 902AWiring Diagram START-UP Pre Start-upStart-Up Blower AdjustmentMain Burner Adjustment Safety Inspection Leak Test Procedure Dual-Seat Gas ValvesFollow-Up Pilot Turn-Down TestPost Start-Up Check Leak TestTo Turn Off Gas To Appliance OperationLighting Instructions Troubleshooting StepPreventive Maintenance Schedule MaintenanceSuggested Minimum Maintenance Schedule Weekly Semi-AnnuallyAnnually As RequiredAppendix Inside Air ContaminationLimited Parts Warranty HI Delta Types H and WH Limited Parts Warranty HI Delta Type P

302A-902A specifications

The Raypak 302A-902A is a highly regarded pool and spa heater, known for its efficiency and reliability in delivering warmth to residential and commercial aquatic applications. This heater stands out due to its robust design, advanced technology, and user-friendly features.

One of the key characteristics of the Raypak 302A-902A is its dual fuel capability, which means it can run on either natural gas or propane. This flexibility allows users to choose their preferred fuel type, contributing to operational efficiency and cost-effectiveness. With a BTU output ranging from 302,000 to 902,000, the Raypak heater is capable of quickly heating large volumes of water, making it ideal for pools, spas, and hot tubs.

The heater incorporates advanced technology such as a stainless steel heat exchanger, which not only ensures excellent thermal conductivity but also promotes durability against corrosion. This is especially advantageous in harsh environments, where exposure to chemicals can significantly impact the lifespan of traditional copper heat exchangers. The Raypak 302A-902A's heat exchanger is designed to withstand the rigors of constant use while maintaining high performance levels.

Another prominent feature of the Raypak 302A-902A is its digital display control system, which simplifies the operation and monitoring of the heater. Users can easily set and adjust temperatures, as well as access diagnostic information, all through an intuitive interface. This digital control not only enhances user experience but also aids in the timely maintenance of the unit.

Energy efficiency is another major selling point of the Raypak 302A-902A. The heater is designed with environmentally friendly practices in mind, utilizing a low NOx burner that minimizes harmful emissions. This not only meets environmental regulations but also makes it a greener alternative for heating needs.

In terms of installation, the compact design of the Raypak 302A-902A allows for versatile placement options, whether in a residential backyard or a commercial environment. Its user-friendly installation process ensures that homeowners and businesses alike can enjoy the benefits of heated water with minimal hassle.

Overall, the Raypak 302A-902A is an exemplary choice for anyone seeking a high-quality, efficient, and flexible pool and spa heating solution. Its combination of robust engineering, advanced technology, and user-focused features solidifies its position as a leader in the market, promising effective heating for years to come. Whether for personal enjoyment or commercial use, this heater delivers exceptional performance that meets diverse heating needs.
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