Crown Boiler MWC116ELT, MWC Series, MWC116ENL, MWC116ELL, MWC116ENT VII Venting, Vent System Design

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VII Venting

WARNING

Failure to vent this boiler in accordance with these instructions could cause flue gas to enter the building resulting in severe property damage, personal injury, or death:

•Do not attempt to vent this boiler with galvanized, PVC, or any other vent components not listed in Table 7.3.

•Do not obtain combustion air from within the building.

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

CAUTION

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 two basic ways to vent this boiler:

•Horizontal (“Side Wall”) Concentric Venting - Vent system exits the building through an outside wall. Concentric venting consists of a “pipe within a pipe”. Flue gas exits the building through the inner pipe and combustion air is drawn into the boiler through the space between the inner and outer pipe.

•Vertical Concentric Venting - Vent system exits the building through the roof. Concentric venting consists of a “pipe within a pipe”. Flue gas exits the building through the inner pipe and combustion air is drawn into the boiler through the space between the inner and outer pipe.

Both of these systems are considered “direct vent” because in both, combustion is drawn directly from the outdoors into the boiler. A description of all of these venting options are shown in Tables 7.1 and 7.6. For clarity, these vent options are numbered from 1 to 6. One of the vent option columns in Tables 7.1 or 7.6 must match the planned vent and air intake system exactly. In addition, observe the following guidelines:

1)Approved vent systems - Use only one Concentric vent system components supplied by Crown. The standard boiler is supplied with a concentric vent system having a maximum usable length of 25” (Figure 2.1). For longer runs, additional straight lengths and elbows are available from Crown. In some cases, larger diameter concentric pipe must be used. Each Crown concentric vent component consists of an inner pipe of polypropylene and the outer pipe of steel. Integral gaskets on each concentric fitting provide a gas tight seal. A list of all Crown concentric vent components is shown in Table 7.3.

In this manual, concentric pipe sizes are called out in terms of the inner and outer pipe nominal diameters in millimeters. For example, “60/100mm” pipe consists of a 60mm exhaust pipe inside a 100mm diameter outer pipe.

2)Maximum Vent and Air Intake Lengths - The maximum length of the vent air intake piping depends upon the vent option selected. See Table 7.1 or 7.6 for the maximum vent length. In horizontal vent systems, the lengths shown in Table 7.1 are in addition to the Elbow Adaptor on top of the boiler. If more elbows are desired, the maximum allowable vent length must be reduced by the amount shown in Table 7.5 for each additional elbow used. Termination fittings are never counted, although the length of the concentric terminal section is counted.

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Contents MWC Series Page Table of Contents Product Description Key ComponentMWC Boiler Principle Components Maximum Vent Lengths II SpecificationsRatings Other SpecificationsIII Before Installing Clearances To Combustible Or Non-combustible Material Mounting The Boiler Wall Mounting Hole Locations Boiler Mounting VI Air for Ventilation Page VII Venting Vent System DesignPage Horizontal Concentric Venting Vent Options 3a Crown Concentric 60/100 Vent Components Vent Options 1,2 3b Crown Concentric 80/125 Vent Components Vent Options 3,54c Positioning Vent Terminal Under Overhangs Vent/ Air Intake Fitting Equivalent Length Vertical Concentric Vent System Vent Option Removing an Existing Boiler From a Common Chimney All cuts are square and allow for proper insertion 21 Dimension L 22 Cutting Outer Pipe 25 Attaching 60/100mm Terminal Section 30 Installation Of 80/125 Adaptor On Boiler 31a Cuttable Straight Section 32 Cutting Straight Pipe 33a Joining Cuttable Pipe 34a Dimension L, 80/125mm Horizontal Terminal 34c Cutting Inner Pipe Of 80/125mm Horizontal Terminal 35a Dimension H 35b Cutting Vertical Terminal 36 Chimney Chase Installation Condensate Trap and Drain Line 40 Condensate Piping ArrangementViii Gas Piping Gas Connection To Boiler IX System Piping Standard PipingBasic Piping Relief Valve Installation Piping for Special Situations Internal Boiler PipingPrimary-Secondary Piping MWC116E*T Combi Internal Boiler-Side Piping Schematic MWC116E*L Heat-Only Internal Piping Schematic Domestic Water Piping DHW Piping MWC116E*T Combi Internal DHW-Side Piping Schematic XI Wiring Field Supplied Box End Boiler End Location of Terminal Blocks and 7/8 Hole for Whip Field Wiring 120VAC Thermostat Internal Boiler Wiring XII Start-up and Checkout Location of Automatic Air Vent CapLocation of Circulator Shaft Cover Control Panel Page Inner Cover Removal For Your Safety Read Before Operating MWC Series Lighting and Operating InstructionsHigh Fire Combustion Readings Xiii Operation DHWHeating System Knob Sequence of Operation Also Refer to Figures 9.7, 9.8, 10.3 See Part XV for Error Codes Flash Codes During Normal OperationXIV. Service and Maintenance Removing Combustion Chamber Cover Service Notes InducerCondensate Trap Removal XV. Troubleshooting No Error Code DisplayedError Codes Lamp Number Flame Meaning Corrective ActionFlow Chart for Isolating Limit and APS Errors See Table XVI Parts Flow group and three way diverter valve Model combi Flow and return groups Model c.h. only Pump and main circuit assembly Model combi Pump and main circuit assembly Model c.h. only Gas assembly Connection pipes Control panel and ignition device Model combi Control panel and ignition device Model c.h. only Wiring Model combi Wiring Model c.h. only Fan, combustion chamber and case panels Description Spare part code Description Spare part code Description Spare part code Installation of Carbon Monoxide Detectors Approved Carbon Monoxide Detectors 11/07

MWC116ENL, MWC116ELL, MWC116ELT, MWC116ENT, MWC Series specifications

Crown Boiler's MWC Series represents a commendable choice in the realm of residential and light commercial heating solutions. Specifically, models like the MWC116ENT, MWC116ELT, MWC116ELL, and MWC116ENL stand out due to their exceptional performance, reliability, and innovative features.

At the core of the MWC Series lies a robust cast iron boiler construction designed to withstand the test of time. This material not only provides durability but also enhances heat retention, thereby increasing the system's efficiency. Each model in this series is designed for natural gas or propane fuel types, ensuring flexibility based on availability and user preference.

A notable feature of the MWC116 models is the efficient heat exchanger, which enables rapid heating of water for both space heating and domestic hot water applications. With a heating capacity of 116,000 BTUs, these boilers deliver ample warmth for mid-sized homes or light commercial settings, making them a versatile option for various applications.

The MWC116ENT model is equipped with an energy-efficient electronic ignition system, which enhances reliability and efficiency. This technology reduces energy consumption, providing users with cost savings on their utility bills. Similarly, the MWC116ELT model boasts an integrated aquastat that regulates water temperature, ensuring optimal performance and comfort.

For those requiring increased venting options, the MWC116ELL model includes advanced horizontal venting capabilities, allowing for flexible installation in various environments. This feature aids in overcoming space limitations and facilitating optimal combustion conditions. The MWC116ENL, on the other hand, features a low NOx emissions configuration, making it an environmentally conscious choice for users concerned about their carbon footprint.

User-friendly controls are a characteristic hallmark of the MWC Series, enabling straightforward operation and easy adjustments. The boilers come equipped with a digital display that provides critical system information and diagnostics, streamlining maintenance efforts.

Overall, the Crown Boiler MWC Series, particularly models like the MWC116ENT, MWC116ELT, MWC116ELL, and MWC116ENL, offer an impressive blend of efficiency, flexibility, and advanced technology. These units are designed to meet contemporary heating demands while ensuring sustainable operation, making them a wise investment for comfort and performance in residential and light commercial applications alike. With reliable construction and innovative features, the MWC Series remains a top choice for those seeking effective heating solutions.
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