The stainless steel direct vent cap must be furnished by the boiler manufacturer in accordance with its list- ing (sales order option D-15).

Use only double-wall vent pipe and the special gas vent pipes listed for use with category II or IV gas burn- ing boilers, such as the stainless steel Saf-T vent by Heat Fab Inc. (800-772-0739), Protech Systems Inc. (800-766-3473), Z-Flex (800-654-5600) or American Metal Products (800-423-4270). Pipe joints must be positively sealed. Follow the vent manufacturer’s installation instructions carefully.

Direct Vent - Horizontal Through- the-Wall

Fig. 40: Direct Vent - Horizontal Through-the-Wall

Installation

These installations utilize the boiler-mounted blower to draw combustion air from outdoors and vent combus- tion products to the outdoors.

The total length of the direct vent through-the-wall exhaust vent cannot exceed 40 ft in length for the flue outlet. Each elbow used is equal to 10 ft of straight pipe. This will allow installation in one of the three fol- lowing combinations:

•40’ of straight flue pipe

•30’ of straight flue pipe and one elbow

•20’ of straight flue pipe and two elbows

The total length air supply duct cannot exceed the dis- tances listed. Each elbow used is equal to 10 ft of straight pipe. This will allow installation in one of the three following combinations:

•40’ of straight combustion air pipe

•30’ of straight combustion air pipe and one elbow

•20’ of straight combustion air pipe and two elbows

The flue exhaust direct vent cap is not considered in the overall length of the venting system.

Care must be taken during assembly that all joints are sealed properly and are airtight.

The vent must be installed to prevent the potential ac- cumulation of condensate in the vent pipes. It is recommended that:

1.The vent must be installed with a slight downward slope of not more than 1/4 inch per foot of hori- zontal run to the vent terminal.

2.The vent must be insulated through the length of the horizontal run.

For installations in extremely cold climate, it is rec- ommended that:

1.The vent must be installed with a slight upward slope of not more than 1/4 inch per foot of hori- zontal run to the vent terminal. In this case, an approved condensate trap must be installed per applicable codes.

2.The intake vent must be insulated through the length of the horizontal run.

Common Venting System

Common venting of Category IV systems is not al- lowed.

WARNING: No substitutions of flue pipe or vent cap material are allowed. Such substitutions would jeopardize the safety and health of inhabitants.

The stainless steel flue exhaust direct vent cap must be furnished by the boiler manufacturer in accordance with its listing (sales order option D-15).

Use only double-wall vent pipe and the special gas vent pipes listed for use with category II or IV gas burn- ing boilers, such as the stainless steel Saf-T vent by Heat Fab Inc. (800-772-0739), Protech Systems Inc. (800-766-3473), Z-Flex (800-654-5600) or American Metal Products (800-423-4270). Pipe joints must be positively sealed. Follow the vent manufacturer’s installation instructions carefully.

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Raypak 302B, 902B manual Direct Vent Horizontal Through- the-Wall
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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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