3.Carefully remove 2-stage solenoid.

4.Skip to Step 9 for LO-fire adjustment only.

5.Locate and remove Lo-fire adjustment cap.

6.Carefully remove the spring & weight.

7.Using an allen wrench, turn clockwise to increase and counterclockwise to decrease the HI-fire man- ifold pressure. Heater will not run while adjusting HI-fire pressure.

8.Carefully place the spring & weight back in before replacing LO-fire adjustment cap.

9.For LO-fire adjustment, tighten the cap to increase the pressure, loosen to decrease.

10.When correct settings are set, replace the sole- noid and tamper screw in place.

1.Turn off gas supply at the appliance service level.

2.Remove the pressure regulator cover assembly.

3.Remove the existing stem/spring assembly.

4.Insert the replacement stem/spring assembly.

5.Replace the pressure regulator cover assembly and tighten screws.

6.Mount conversion labels on the gas valve.

Fig. 30: Gas Valve Adjustment (Invensys Valve)

Gas Type Conversion on Valve

WARNING: Burner orifices must be changed when changing gas type.

NOTE: Model HD401 requires replacement of valve.

Fig. 31: Gas Type Conversion on Honeywell Valve

Safety Inspection

Replace main gas manifold adjustment screw cap.

Check all thermostats and high limit settings.

During the following safety checks leave manome- ters hooked up, check and record.

If other gas fired equipment are in the room and on same gas main check all pressures on the Hi Delta SS with all other equipment running.

Check thermostats for ON/OFF operation.

Check High limits for ON/OFF operation.

While in operation, check flow switch operation.

Check the low gas pressure switches (For proper adjustment, if available, use the attached manometers to set pressure. The scales on the switch are approximate only); Low gas pressure switch (optional) must be set at 3.5 in. WC for nat- ural gas and 10.5 in. WC for LP gas.

High gas pressure switch (optional) at 1 in. WC above manifold pressure.

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Raypak HD101, HD401 manual Gas Type Conversion on Valve, Safety Inspection

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.