High Limit (Manual Reset)

The heater is equipped with a manual reset high limit temperature device. Push the reset button and adjust the setting to 40 - 50°F above desired operating tem- perature.

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. 30: High Limit (Manual Reset)

Flow Switch

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

Fig. 32: Low Water Cut-Off

High and Low Gas Pressure Switches

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 performance. The low gas pressure switch automati- cally shuts down the heater if gas supply drops below the recommended setting of 5.0 in. WC for natural gas, and 10.0 in. WC for propane gas.

The high gas pressure switch (optional) connection mounts downstream of the stage-1 gas valve. If the gas pressure 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 recom- mended setting of 5.0 in. WC for natural gas, and 11.5 in. WC for propane gas.

Fig. 31: Flow Switch

Operating Control

The heater may be equipped with different types of

 

operating controls. Consult the individual control data

 

sheets supplied with your heater paperwork. See the

 

General Safety Section for safety precautions con-

Fig. 33: High/Low Gas Pressure Switch

cerning domestic hot water applications.

 

37

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Raypak 302B, 902B High Limit Manual Reset, Low Water Cut-Off Optional, Flow Switch, High and Low Gas Pressure Switches
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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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