Raypak 302B, 902B Pressure Drop in Feet of Head Feedwater Regulator, Piping, Three-Way Valves

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Pressure Drop in Feet of Head 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.

Piping

All high points should be vented. Purge valves and a bypass valve should be installed. A heater installed above radiation level must be provided with a low wa- ter cut-off device (sales order option F-10). The heater, when used in connection with a refrigeration system, must be installed so that the chilled medium is piped in parallel with the heater with appropriate valves to pre- vent the chilled medium from entering the heater.

The piping system of a hot water heater connected to heating coils located in air handling units where they may be exposed to circulating refrigerated air, must be equipped with flow control valves or other automatic means to prevent gravity circulation of the heater water during the cooling cycle. It is highly recommend- ed that the piping be insulated.

Air-Separation/Expansion Tank

All heaters should be equipped with a properly sized expansion tank and air separator fitting as shown in Fig. 10.

heaters which are not subject to thermal shock. Raypak offers a full line of electronic sequencers that produce direct reset of heater water temperature.

(Refer to the Controls section of the Raypak Catalog.)

NOTE: BYPASS FOR

LOW TEMP SYSTEMS ONLY

SYSTEM SENSOR

(HEAT PUMP)

5’ MAX

SYSTEM SENSOR

(4:1 TURNDOWN 5’ MAX

OR GREATER)12” MAX

OR MIN FEASIBLE

Fig. 11: Single Heater - For Hydronic or Heat Pump

Primary/Secondary Piping

 

 

SYSTEM SENSOR

 

 

(LESS THAN

 

 

4:1 TURNDOWN)

 

 

5’ MAX

 

5’ MAX

12” MAX

SYSTEM SENSOR

 

OR MIN FEASIBLE

(4:1 TURNDOWN

 

 

OR GREATER)

 

 

Fig. 10: Air-Separation/Expansion Tank

Three-Way Valves

Valves designed to blend water temperatures or reduce water circulation through the heater should not be used. Raypak heaters are high-recovery, low-mass

Fig. 12: Dual Heaters (Reverse/Return)

with Primary/Secondary Piping

Domestic Hot Water

When designing the water piping system for domestic hot water applications, water hardness should be con- sidered. Table I indicates the suggested flow rates for soft, medium and hard water. Water hardness is ex- pressed in grains per gallon.

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Contents Installation & Operating Instructions Deletions None Contents Pay Attention to These Terms Installations at Elevation Before InstallationProduct Receipt Model IdentificationComponent Locations Back Component LocationsGeneral Information Water Time to Produce Serious Temp Burn General SafetyTime/Temperature Relationships in Scalds Installation Codes InstallationEquipment Base StackingClearances Indoor InstallationsOutdoor Installations Ft 91 cm within a Indoor Units Combustion and Ventilation AirReversing Air Filter Direct VentConventional Combustion Air Supply InstallationsTruSeal Combustion Air All Air from Inside the BuildingWater Piping Canadian InstallationsGeneral Reversing Water ConnectionsCold Water Operation Relief Valve Piping Hydrostatic TestHydronic Heating Temperature & Pressure GaugePump Selection Cold Water StartsPiping Pressure Drop in Feet of Head Feedwater RegulatorAir-Separation/Expansion Tank Three-Way ValvesPool Heating Potable Water and Space HeatingWinterizing Your Heater Automatic Chlorinators and Chemical FeedersPool/Spa Water Chemistry Water HardnessTotal Dissolved Solids PH of WaterGas Supply Connection Gas SupplyModel Table K Maximum Equivalent Pipe LengthField-Connected Controllers Electrical Power ConnectionsGas Supply Pressure Making the Electrical Connections Field Wiring ConnectionCheck the Power Source Stage Tankstat Flue Exhaust Tee VentingModel Diameter Order Number Appliance CategoriesVent Terminal Location Support of Vent StackChanging the Flue Outlet InstallationsCanadian Installations Venting Configurations Venting Installation TipsInstallation Natural Draft Vertical Venting CategoryCommon Venting System TerminationCertified Vertical Venting Combustion Air Air Inlet HeightHorizontal Through-the-Wall Venting Category Horizontal Through-the-Wall Venting CategoryModel Certified Maximum Combustion Air Inlet Direct Vent Horizontal Through- the-WallVenting EquivalentDirect Vent Vertical Direct Vent VerticalFreeze Protection Outdoor InstallationControls Models 302B-902B Heater Sequence of OperationExternal Lights Color Indication Code Condition Ignition ModuleFlow Switch High Limit Manual ResetHigh and Low Gas Pressure Switches Low Water Cut-Off OptionalPump Time Delay UDB Diagnostic BoardUDB Fault History Table R UDB Fault Messages Water Piping 87%-Efficiency Boilers Special InstructionsVenting Appliance Categories Model 10F 20F 30F Min. Flow Max Flow GpmCondensate Management Vertical Venting CategoryVent Terminal Location 752BE Combustion Air 902BE 30’ 80’ Certified Maximum Combustion Air Air Inlet Model VentingDirect Vent Horizontal Through- the-Wall ABS Cpvc Wiring Diagram Pre Start-up START-UPStart-Up Blower AdjustmentMain Burner Adjustment Leak Test Procedure Dual-Seat Gas Valves Safety InspectionFollow-Up Pilot Turn-Down TestLeak Test Post Start-Up CheckTo Turn Off Gas To Appliance OperationLighting Instructions Step TroubleshootingPreventive Maintenance Schedule MaintenanceSuggested Minimum Maintenance Schedule Semi-Annually WeeklyAnnually As RequiredInside Air Contamination AppendixLimited Parts Warranty HI Delta Types H and WH Limited Parts Warranty HI Delta Type P START-UP Checklist for FAN-ASSISTED Raypak Products Important Instructions for the Commonwealth of Massachusetts
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302B, 902B specifications

Raypak is a prominent name in the heating industry, particularly known for its advanced technology and robust design in residential and commercial heating solutions. Two of their notable models, the Raypak 302B and 402B, exemplify innovation and efficiency in hydronic heating systems, designed to meet diverse needs while ensuring optimal performance.

The Raypak 302B and 402B are high-efficiency boilers that utilize gas-fueled systems. The 302B model has a heating capacity of 302,000 BTU/h, while the 402B boasts a maximum capacity of 402,000 BTU/h. This range of heating output makes these models suitable for a variety of applications, from residential heating needs to larger commercial spaces that require a reliable heat source.

One of the standout features of the Raypak 302B and 402B is their use of fire-tube heat exchanger technology. This design promotes efficient heat transfer and allows for lower emissions, thus minimizing the environmental impact. The fire-tube design also contributes to a longer lifespan and reduced maintenance costs, making these boilers a cost-effective solution over time.

Equipped with advanced control systems, the Raypak 302B and 402B ensure precise temperature regulation and improved energy usage. The digital display provides real-time feedback and diagnostics, enhancing user experience and simplifying troubleshooting. These models are also compatible with various building management systems, providing users with versatility in integration to optimize building performance.

In addition to their technological advancements, these boilers are designed with user safety and convenience in mind. They include features such as built-in safety controls, easy access for service and maintenance, and a compact footprint to fit into tight spaces. Their robust construction ensures durability, which is crucial for systems that operate under high demand.

Moreover, both models have been engineered to succeed in various climates, making them reliable choices for users in diverse geographical locations. With their energy-efficient operation, reliable performance, and advanced features, the Raypak 302B and 402B embody quality and innovation in the heating market, ensuring comfortable environments while lowering energy costs and environmental footprints.
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