WARNING: Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under a positive pressure.

Horizontal Through-the-Wall Venting (Category IV)

*Requires optional vent tee for rear discharge.

pressure reading must be between -0.01 and -0.1 in. WC as measured 12 in. from the appliance flue outlet. Each elbow used is equal to 10 ft of straight pipe. This will allow installation in one of the four following com- binations:

•70’ of straight flue pipe

•60’ of straight flue pipe and one elbow

•50’ of straight flue pipe and two elbows

•40’ of straight pipe and three elbows

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

The vent must be installed to prevent flue gas leakage. Care must be taken during assembly to ensure that all joints are sealed properly and are airtight. The vent must be installed to prevent the potential accumulation of condensate in the vent pipes. It is recommended that:

Fig. 39: Horizontal Through-the-Wall Venting

(Category IV)

Installation

These installations utilize the boiler-mounted blower to vent the combustion products to the outdoors. Combustion air is taken from inside the room and the vent is installed horizontally through the wall to the out- doors. Adequate combustion and ventilation air must be supplied to the mechanical room in accordance with the NFGC (U.S.) and B149 (Canada).

The total length of the horizontal through-the-wall ex- haust vent system should not exceed 70 ft in length. If horizontal run exceeds 70 ft, an appropriately sized extractor must be used. To maintain proper operation,

1.The vent must be installed with a slight upward slope of not more than 1/4 in per foot of horizontal run to the vent terminal.

2.The 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.

 

Certified

 

Maximum

Combustion Air

Air Inlet

Model

Venting

Vent Size

Equivalent

Intake Pipe

Max. Length*

 

Material

 

Vent Length

Material

6”

8”

 

 

 

 

 

 

 

 

 

 

 

 

302BE

 

5”

70’

 

100’

N/A

 

 

 

 

402BE

 

 

 

 

6”

Room Air

Galvanized Steel,

 

 

502BE

 

 

75’

 

Category II

 

40’

PVC,

 

652BE

or IV

 

ABS,

 

100’

 

Ducted

 

 

 

CPVC

40’

752BE

 

8”

Combustion

 

 

 

 

 

 

 

 

Air

 

 

 

902BE

 

 

 

30’

80’

 

 

 

 

 

 

 

 

 

 

 

* Subtract 10 ft per elbow. Max. 3 elbows.

Maximum combustion air duct length terminated at 100 equivalent ft.

Table U: Category II and IV Venting

42

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Raypak 302B manual Certified Maximum Combustion Air Air Inlet Model Venting, 752BE Combustion Air 902BE 30’ 80’
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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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