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)

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

*Requires optional vent tee.

Fig. 43: 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,

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:

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

10”

12”

 

 

 

 

 

 

 

 

 

 

 

 

992BE

 

10”

 

 

 

 

 

 

 

70’

 

 

 

1262BE

 

12”

 

75’

100’

 

 

Room Air

Galvanized Steel,

 

 

1532BE

 

 

 

 

 

 

 

 

 

Category II

 

40’

PVC,

 

 

1802BE

 

 

 

 

or IV

14”

Ducted

ABS,

 

 

2002BE

 

 

 

CPVC

 

 

 

Combustion

40’

75’

 

 

 

 

2072BE

 

 

 

 

 

Air

 

 

 

 

 

 

 

 

 

 

2342BE

 

16”

 

 

 

 

 

 

 

 

 

 

 

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

Maximum combustion air duct length terminated at 100 equivalent ft.

Table Q: Category II and IV Venting

47

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Raypak 992B manual Certified Maximum Combustion Air Air Inlet Model Venting, Combustion 40’ 75’ 2072BE Air 2342BE
Page 46 Page 48

992B specifications

The Raypak 992B is a highly regarded commercial boiler known for its efficiency and reliability in heating applications. Designed for a range of installations, it is particularly favored in schools, hotels, and various commercial settings where dependable heating is crucial. One of the standout features of the Raypak 992B is its impressive thermal efficiency rating, often exceeding 90%. This efficiency translates into lower energy costs and reduced environmental impact, making it a smart choice for eco-conscious businesses.

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Another significant characteristic of the Raypak 992B is its robust construction. Built with durable materials designed to withstand demanding operating conditions, this boiler is engineered for long-lasting performance. Its compact design is an added benefit, facilitating installation in areas with limited space. The unit is also equipped with a stainless steel heat exchanger, which provides superior resistance to corrosion and enhances heat transfer efficiency.

Safety features are also paramount in the design of the Raypak 992B. The boiler includes multiple safety controls and alarms to prevent overheating and maintain safe operating conditions. This diligence in safety ensures peace of mind for operators and reduces the risk of unexpected downtime.

In summary, the Raypak 992B stands out as a top choice for commercial heating solutions, combining high efficiency, advanced technology, and rugged construction. Its features cater to a wide range of heating needs while prioritizing safety and economy. With its impressive performance capabilities, the Raypak 992B continues to be a reliable partner for facilities seeking optimal heating solutions.
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