Raypak HD401 Gas Supply Pressure, Gas Pressure Regulator, Table G Maximum Equivalent Pipe Length

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Fig. 13: Sediment Trap Orientation

CAUTION: Do not use Teflon tape on gas line pipe thread. A pipe compound rated for use with gas systems is recommended. Apply sparingly only on male pipe ends.

CAUTION: Support gas supply piping with hangers, not by the heater or its accessories. Ensure the gas piping is protected from physical damage and freezing where required.

Gas Supply Pressure

A minimum of 4 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 in. WC and a maximum of 13 in. WC is required for propane gas. The gas pressure regulator supplied on the heater is for low pressure service. If upstream

pressure exceeds 14 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.

Gas Pressure Regulator

The gas valve pressure regulator(s) on the heater are nominally preset at 3 in. WC for natural gas, and 10.0 in. WC for propane gas manifold pressure. The pres- sure at the gas valve outlet tap, measured with a manometer, while in operation should be 3.0 in. ± 0.3 in. WC (HI), and 1.0 in. ± 0.1 WC (LO) for natural gas and 10.0 in. ± 0.1 in. WC (HI), and 3.5 in. ± 0.1 in. WC (LO) for propane gas. If an adjustment is needed, turn the adjustment screw clockwise to increase pressure or counter-clockwise to decrease pressure.

Model

Input

3/4”

 

1”

1-1/4”

1-1/2”

 

 

 

 

 

 

 

 

 

 

No.

(KBTUH)

N

P

N

 

P

N

P

N

P

 

 

 

 

 

 

 

 

 

 

 

 

 

HD101

100

105

385

340

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HD151

150

50

180

160

 

530

600

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HD201

199

30

95

95

 

355

360

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HD251

250

20

50

60

 

230

240

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HD301

299

15

35

45

 

170

170

550

360

 

 

 

 

 

 

 

 

 

 

 

 

HD401

399

5

20

25

 

80

100

365

210

 

 

 

 

 

 

 

 

 

 

 

 

Natural gas – 1,000 BTUH per ft3, .60 specific gravity at 0.5 in. WC pressure drop Propane gas – 2,500 BTUH per ft3, 1.50 specific gravity at 0.5 in. WC pressure drop

Table G: Maximum Equivalent Pipe Length

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Contents Installation & Operating Instructions Page Contents Are important but not related to personal injury hazards Installations at Elevation Product ReceiptRatings and Certifications Component Locations Component Locations Angle ViewGeneral Information Model Quantity of Burners Vent Size FlueGeneral Safety Time/Temperature Relationships in ScaldsWater Time to Produce Serious Temp Burn Indoor/Closet Installations InstallationInstallation Codes Equipment BaseOutdoor Installations Heater Side Minimum InstalledCombustion and Ventilation Air Conventional Combustion Air SupplyInstallations in Canada Water PipingGeneral Reversing Water Connections Relief Valve PipingHydronic Heating Dual Boiler-Primary/Secondary Piping Air-Separation/Expansion Tank Domestic Hot Water PipingPiping-Heating Boilers Three-Way ValvesGas Supply Gas Supply ConnectionGas Supply Pressure Gas Pressure RegulatorTable G Maximum Equivalent Pipe Length Surge Protection Electrical Power ConnectionsCheck the Power Source Making the Electrical ConnectionsElectrical Connections Domestic Hot Water Stage TankstatVenting Definition of Appliance CategoriesBarometric Damper Support of Vent StackVent Terminal Location Table I Vent/Air Inlet Termination Clearances US Installations Certified Minimum Venting Installation TipsVenting Configurations Model Appliance Barometric Damper feetNatural Draft Vertical Venting System Installation Natural Draft Vertical Vent TerminationModel Appliance Certified Vent Size Max. Venting Category Inches Length feetHorizontal Thru-wall Direct Vent Termination Category Inches Length Certified Max Combustion Air Inlet Max. Air ModelVenting Air Intake FeetMaterial Inches Min Max Inches FeetOutdoor Installation Vertical Direct Vent System InstallationVertical Direct Vent Termination Controls High Limit Manual ResetHigh Limit Auto Reset Optional Ignition Control ModuleFlow Switch High and Low Gas Pressure Switches OptionalLow Water Cut Off Optional Wiring DIAGRAM-MODELS HD101-HD401 HD Troubleshooting PRE-START-UP Initial START-UPPage Main Burner Adjustment Gas Valve AdjustmentStart-Up Safety Inspection Gas Type Conversion on ValvePost START-UP Check Follow-UpAir Filter Inspection/Removal Heat Exchanger Removal Remove the Screws and PanelMaintenance Suggested Minimum Maintenance ScheduleYearly Beginning of each heating season Daily AppendixInside Combustion Air Contamination MonthlyPage Page Page
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HD101, HD401 specifications

Raypak is renowned for its commitment to high-quality heating solutions, with the HD101 and HD401 models standing out in their product range. These units are designed specifically for commercial applications, providing reliable and efficient hydronic heating systems. The HD series embodies innovation while addressing the unique demands of larger spaces.

One of the main features of the HD101 and HD401 is their stainless steel construction, which ensures increased durability and resistance to corrosion. This design choice enhances the longevity of the units, making them ideal for various installations in commercial or industrial settings.

Both models are equipped with a high-efficiency heat exchanger that maximizes heat transfer while minimizing energy consumption. This feature is particularly significant in today’s environmentally conscious market, as it contributes to lower operating costs and reduced carbon footprints. The heat exchangers are engineered for easy maintenance, offering simplicity when service is required.

In terms of technology, the HD101 and HD401 include advanced digital controls that allow for precise temperature regulation. This user-friendly interface enables operators to easily manage and monitor heating parameters, facilitating optimal performance and energy management.

The models also feature modulating burners that adjust their output according to the heating demand. This capacity for modulation results in smoother operation and an overall increase in efficiency, as the burners can maintain consistent temperatures without excessive energy use.

Another noteworthy characteristic is their compatibility with various control systems, including BMS (Building Management Systems). This adaptability allows for seamless integration into existing infrastructure, providing users with greater versatility and control over their heating environments.

Both the HD101 and HD401 come with advanced safety features, including flame rollback protection and pressure monitoring, ensuring safe operation even in demanding conditions. Additionally, their compact design allows for easy installation in limited spaces while still providing powerful heating capabilities.

Ultimately, the Raypak HD101 and HD401 are exceptional choices for those in need of high-efficiency commercial heating solutions. With their robust construction, advanced technology, and user-friendly features, these models promise to deliver reliable performance and energy savings for years to come. Whether for a large facility or a specific industrial application, they stand ready to meet the heating challenges of today’s commercial landscape.