Crown Boiler CWD165, CWD083, CWD220, CWD060, CWD138, CWD193, CWD245 VI Venting, Vent System Design

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VI Venting

WARNING

Failure to vent this boiler in accordance with these instructions could result in unreliable boiler operation, severe damage to the boiler or property, or unsafe operation:

*Do not attampt to vent this boiler with galvanized, PVC, or any other vent system not listed in Table 4.

*Do not attempt to mix components from different approved vent systems.

*Do not install a barometric damper or drafthood on this boiler.

*Do not attempt to use the vent system for this boiler with any other appliance.

*Moisture and ice may form on the surfaces around the vent termination. To prevent deterioration, surfaces should be in good repair (sealed, painted, etc.)

A. Vent System Design

There are three basic ways to vent the CWD boiler:

•Horizontal (“side wall”) Venting - Vent system exits the building through an outside wall. Combustion air is either obtained through a separate pipe from outside (a “direct vent” installation) or obtained from the boiler room (a “direct exhaust” installation).

•Vertical Non-Coaxial Venting - Vent system exits the building through a roof. Combustion air is either obtained through a separate pipe from outside (a “direct vent” installation) or obtained from the boiler room (a “direct exhaust” installation).

•Vertical Coaxial Venting - Vent system exits the building through a roof. A portion of the vent system is coaxial, meaning that it consists of a “pipe within a pipe”. Flue gasses exit the building through the inner pipe and combustion air is drawn through the space between the two pipes.

For each of the above three basic methods, there are several variations, resulting in a total of 13 options for venting the CWD boiler. A description of each of these venting options is listed in Tables 3a - 3c. For clarity, these vent options are numbered from 1 to 13 in Table 3. One of the vent option columns in Table 3 must match the planned vent and air intake system exactly. In addition, observe the following guidelines:

1)Approved vent systems - Use only one of the approved vent systems shown in Table 4. These systems are made of a special stainless steel alloy (AL29-4C) for protection against corrosive flue gas condensate. They are also designed to provide a gas tight seal at all joints and seams so that flue gas does not enter the building. Each approved vent system has unique method for installation - do not attempt to mix components from different vent systems. The only exceptions are:

•Heat Fab Saf-T Vent SC may be combined with Saf-T Vent EZ Seal.

•Protech FasNSeal W2 may be combined with Protech FasNSeal.

See the vent installation section of this manual for information on how this can be done.

Heat Fab Saf-T Vent SC is a double wall vent system which can be used in two ways on CWD installations. In vertical coaxial vent systems (Vent Options 12 and 13), the space between the inner and outer pipes is used as a conduit to bring combustion air to the boiler. In Horizontal (Vent Options 1 to 5) and Vertical (Option 6 to 10) vent systems, Saf-T Vent SC can be used to obtain a 0” clearance to combustible construction. When this is done, the space between the inner and outer pipes is used for ventilation, but boiler combustion air comes from elsewhere.

Protech FasNSeal W2 is also a double wall vent system. In some cases, it can used to obtain closer clearances to combustible construction than are possible using Protech FasNSeal (see Table 2). The space between the inner and outer pipes on FasNSeal W2 cannot be used as a combustion air conduit.

The Crown Vertical coaxial vent system (Vent Option 11) is similar to that constructed using Heat Fab Saf-T Vent SC except it is constructed by running one of the 3” single wall vent systems shown in Table 4 inside 5” type “B” vent. The space between the 3” vent and the “B” vent forms a conduit to bring combustion air to the boiler. The advantage of this system is that it can be constructed using any of the vent systems shown in Table 4 except for Heat Fab Saf-T Vent SC and Protech FasNSeal W2. No turns are permitted in the coaxial section of this system.

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Contents CWD Series Table of Contents II Specifications Product DescriptionIV Locating the Boiler III Before InstallingClearances When Combustion AIR is Obtained from Boiler Room Clearances from Vent Piping to Combustible Construction Air for Combustion and VentilationPage If Indoor Combustion Air is Used, Provide Air as Follows ALL AIR from Outside Using Ventilated Crawl Space and Attic ALL AIR from Outside Using Openings Into Boiler Room Vent System Design VI VentingSummary of Horizontal Venting Options Page Horizontal Direct Exhaust Vent System Vent Options 4,5 Page Summary of Vertical Venting Options Vertical NON-COAXIAL Direct Vent System Vent Options 6 Summary of Vertical Coaxial Venting Options Page Permissible Vent Systems and Principle Vent Components AIR Intake Fitting Removing an Existing Boiler From a Common ChimneyVent Fitting Horizontal Terminal Offsets Positioning Vent Terminal Under Overhangs USE of Condensate Traps Vent / Intake System AssemblyFAN Outlet Orifice Crown Coaxial Terminal Exploded View CORR/GUARD Connection to Vent Collar Vent III Connection to Vent Collar SAF-T Vent Ezseal Connection to Vent Collar Fasnseal Connection to Vent Collar FSA-SWDW3 Page Condensate TRAP/DRAIN Detail GAS Connection to Boiler VII Gas PipingStandard Piping Viii System PipingPiping for Special Situations Basic Piping Bypass Piping Chiller Piping CB502 System Single Zone Wiring IX WiringCB502 Control System Single Zone Field Wiring CB502 Control System Sequence of Operation CB502 System Wiring VariationsCB502 Control System Field Wiring for TWO Circulator Zones CB502 Control System Internal Ladder Diagram CB502 Control System Internal Connection Diagram R8285 Control System Sequence of Operation R8285 Control System Single Zone WiringR8285 Control System Wiring Variations R8285 Control System Single Zone Field Wiring R8285 Control System Zone Valve Field Wiring R8285 Control System Internal Connection Diagram Start-up and Checkout For Your Safety Read Before Operating Pilot Burner Flame GAS Valve XI Service and Maintenance Heat Exchanger Cleaning Procedure Service Notes Pressure Switch Settings Measuring Pressure Across Pressure Switch XII Troubleshooting PWR DHW Limit 24V GND on ign. module? Thermostat calls for heat Circulator Pilot Main Start Xiii Parts BLOCK, BASE, Flue Collector Components Page Burner Tray Components Page Jacket Components Page Common Controls & Trim Page Page Page Crown

CWD193, CWD165, CWD245, CWD220, CWD110 specifications

Crown Boiler Company is well-known for its commitment to quality and performance in the heating industry. Among its extensive range of products, the Crown Boiler CWD series stands out for its reliability and efficiency. This series includes models CWD060, CWD083, CWD110, CWD138, and CWD220, each designed to meet diverse heating needs in residential and commercial applications.

One of the main features of the CWD series is its durable construction. Made with high-quality materials, these boilers are built to withstand the test of time. The cast iron heat exchanger delivers exceptional heat retention and efficiency, ensuring optimal performance even in demanding conditions. Additionally, the CWD models are equipped with a reliable standing pilot ignition system, which enhances user safety and operational reliability.

Another important characteristic of the Crown CWD series is its versatility in fuel options. These boilers can operate on either natural gas or propane, providing flexibility to homeowners and businesses depending on their preferred energy source. The ability to easily switch fuels makes these units adaptable to various heating applications, maximizing convenience for users.

Efficiency is a cornerstone of the Crown Boiler CWD series. With an AFUE rating of up to 85%, these boilers deliver substantial cost savings over the heating season. Their efficient operation not only lowers energy bills but also contributes to a reduced environmental impact, which is increasingly important in today’s energy-conscious world.

Crown’s innovative design features also include a low water cut-off and a built-in draft hood. The low water cut-off ensures safe operation by preventing the boiler from running dry, while the draft hood allows for optimal venting capabilities, minimizing the risk of dangerous flue gas build-up.

Maintenance is straightforward with the CWD series, thanks to its easy-access design. Routine service and inspections can be performed with minimal disruption, ensuring that the units maintain peak performance over their lifespan.

The Crown Boiler CWD060, CWD083, CWD110, CWD138, and CWD220 models exemplify the brand’s dedication to delivering high-quality heating solutions. With their impressive efficiency ratings, durable construction, versatile fuel options, and user-friendly features, these boilers represent a smart investment for anyone looking to enhance heating reliability and comfort in their space.
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