Raypak 902B, 302B Electrical Power Connections, Gas Supply Pressure, Field-Connected Controllers

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6.Reinstall the pipe cap on the left-hand end of the main gas line.

7.Remove plastic cap from the right-hand side panel and reinstall into the standard main gas opening located on the left-hand side of the heater.

8.Remove the rubber grommet from the left-hand- side panel and reinstall into the standard main gas opening, located on the right-hand side of the heater.

9.Install a coupling, nipple, union and sediment trap onto the right-hand end of the main gas line and then install the gas line, making sure that a manu- al shut-off valve has been installed within 10 ft of the heater.

10.Replace the left and right front panels on the heater.

Gas Supply Pressure

A minimum of 5.0 in. WC and a maximum of 10.5 in. WC upstream gas pressure is required under load and no-load conditions for natural gas. A minimum of 11.0 in. WC and a maximum of 13.0 in. WC is required for propane gas. The gas pressure regulator(s) supplied on the heater is for low-pressure service. If upstream pressure exceeds 14.0 in. WC, an intermediate gas pressure regulator, of the lockup type, must be installed.

When connecting additional gas utilization equipment to the gas piping system, the existing piping must be checked to determine if it has adequate capacity for the combined load.

The gas valve pressure regulator(s) on the heater are nominally preset at 3.5 in. WC for natural gas, and

10.5in. WC for propane gas. The pressure at the gas valve outlet tap, measured with a manometer, while in

Fig. 17: Gas Valve

operation should be 3.5 ± 0.1 in. WC for natural gas and 10.5 in. ± 0.1 in. WC for propane gas. If an adjust- ment is needed, remove the adjustment screw cover and turn the adjustment screw clockwise to increase pressure or counter-clockwise to lower pressure.

CAUTION: For proper operation, no more than a 30% drop in gas supply pressure from no-load to full- load conditions is acceptable. Under no circumstances should the pressure be outside the listed operational range.

Electrical Power Connections

Installations must follow these codes:

•National Electrical Code and any other national, state, provincial or local codes or regulations hav- ing jurisdiction.

•Safety wiring must be NEC Class 1.

•Heater must be electrically grounded as required by the NEC.

•In Canada, CSA C22. 1 C.E.C. Part 1.

The heater is wired for 120 VAC, 8 amps in its basic configuration. Additional options may increase the amp draw of the unit. The voltage is indicated on the tie-in leads. Consult the wiring dia-gram shipped with the heater in the instruction packet. The remote tank control stat, thermostat, or electronic heater control (as applicable) may be connected to the stage selector terminal (See wiring diagram). 24 VAC is supplied to this connection through the heater trans-former. DO

NOT attach any voltage to the stage selector termi- nals. Before starting the heater check to ensure proper voltage to the heater and pump.

Install a separate disconnect means for each load. Use appropriately sized wire as defined by NEC, CSA and/or local code. All primary wiring should be at least 125% of minimum rating.

If any of the original wire as supplied with the heater must be replaced, it must be replaced with 105°C wire or its equivalent.

Field-Connected Controllers

It is strongly recommended that all individually-pow- ered control modules and the heater should be supplied from the same power source.

NOTE: Field-supplied isolation relays should be installed when field-connected controllers are mounted more than 50 equivalent feet (18 Ga) from heater.

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Contents Installation & Operating Instructions Deletions None Contents Pay Attention to These Terms Product Receipt Before InstallationInstallations at Elevation Model IdentificationComponent Locations Component Locations BackGeneral Information Time/Temperature Relationships in Scalds General SafetyWater Time to Produce Serious Temp Burn Equipment Base InstallationInstallation Codes StackingOutdoor Installations Indoor InstallationsClearances Ft 91 cm within a Reversing Air Filter Combustion and Ventilation AirIndoor Units Direct VentTruSeal Combustion Air InstallationsConventional Combustion Air Supply All Air from Inside the BuildingGeneral Canadian InstallationsWater Piping Reversing Water ConnectionsRelief Valve Piping Hydrostatic Test Cold Water OperationPump Selection Temperature & Pressure GaugeHydronic Heating Cold Water StartsAir-Separation/Expansion Tank Pressure Drop in Feet of Head Feedwater RegulatorPiping Three-Way ValvesPotable Water and Space Heating Pool HeatingPool/Spa Water Chemistry Automatic Chlorinators and Chemical FeedersWinterizing Your Heater Water HardnessPH of Water Total Dissolved SolidsModel Gas SupplyGas Supply Connection Table K Maximum Equivalent Pipe LengthGas Supply Pressure Electrical Power ConnectionsField-Connected Controllers Check the Power Source Field Wiring ConnectionMaking the Electrical Connections Stage Tankstat Model Diameter Order Number VentingFlue Exhaust Tee Appliance CategoriesSupport of Vent Stack Vent Terminal LocationCanadian Installations InstallationsChanging the Flue Outlet Installation Venting Installation TipsVenting Configurations Natural Draft Vertical Venting CategoryCertified Vertical Venting Combustion Air Air Inlet TerminationCommon Venting System HeightHorizontal Through-the-Wall Venting Category Horizontal Through-the-Wall Venting CategoryVenting Direct Vent Horizontal Through- the-WallModel Certified Maximum Combustion Air Inlet EquivalentDirect Vent Vertical Direct Vent VerticalControls Outdoor InstallationFreeze Protection Heater Sequence of Operation Models 302B-902BExternal Lights Color Indication Ignition Module Code ConditionHigh and Low Gas Pressure Switches High Limit Manual ResetFlow Switch Low Water Cut-Off OptionalUDB Fault History UDB Diagnostic BoardPump Time Delay Table R UDB Fault Messages Venting Appliance Categories 87%-Efficiency Boilers Special InstructionsWater Piping Model 10F 20F 30F Min. Flow Max Flow GpmVent Terminal Location Vertical Venting CategoryCondensate Management Certified Maximum Combustion Air Air Inlet Model Venting 752BE Combustion Air 902BE 30’ 80’Direct Vent Horizontal Through- the-Wall ABS Cpvc Wiring Diagram START-UP Pre Start-upMain Burner Adjustment Blower AdjustmentStart-Up Follow-Up Safety InspectionLeak Test Procedure Dual-Seat Gas Valves Pilot Turn-Down TestPost Start-Up Check Leak TestLighting Instructions OperationTo Turn Off Gas To Appliance Troubleshooting StepSuggested Minimum Maintenance Schedule MaintenancePreventive Maintenance Schedule Annually WeeklySemi-Annually As RequiredAppendix Inside Air ContaminationLimited 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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