Flow Switch, Low Water Cut Off Optional

The optional adjustable auto reset high limit is located behind the front panel (see Fig. 3). Adjust the setting to approx. 20°F (10°C) above desired outlet tempera- ture.

Fig. 26: High Limit — Auto Reset (Optional)

Flow Switch

Dual-purpose control shuts off heater in case of pump failure or low water flow. Mounted and wired in series with the main gas valve.

NOTE: Flow switch will not operate if flow is less than 12 gpm.

Fig. 27: Flow Switch

High and Low Gas Pressure Switches (Optional)

The low gas pressure switch (optional) connection mounts upstream of the gas valve to ensure that suffi-

cient gas pressure is present for proper regulator per- formance. The low gas pressure switch automatically shuts down the heater if gas supply drops below the recommended setting of 4.0 in. WC for natural gas, and 9.0 in. WC for propane gas.

The high gas pressure switch (optional) connection mounts down-stream of the gas valve. If the gas pres- sure regulator fails, the high gas pressure switch automatically shuts down the burner. The high gas pressure switch automatically shuts down the heater if gas manifold pressure rises above the recommended setting of 4.0 in. WC for natural gas, and 10.5 in. WC for propane gas.

Fig. 28: Gas Pressure Switch

Low Water Cut Off (Optional)

The low water cut off automatically shuts down the burner whenever water level drops below the level of the sensing probe. A 5-second time delay prevents premature lockout due to temporary conditions such as power fluctuations or air pockets.

Fig. 29: Low Water Cut Off

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.