IX System Piping

CAUTION

•Install boiler so that the gas ignition system components are protected from water (dripping, spraying, rain, etc) during appliance operation and service (circulator replacement, etc).

•Operation of this boiler with continuous return temperatures below 86F can cause severe heat exchanger corrosion damage.

•Operation of this boiler in a system having frequent additions of make-up water can cause severe heat exchanger damage.

•Do not use toxic additives, such as automotive antifreeze, in a hydronic system.

•Before connecting boiler, make sure that the system is free of sediment, flux and any residual boiler water additives. Flush the system if necessary to ensure that these contaminates are removed.

A. Standard Piping

Figure 9.1 shows typical boiler system connections on a single zone system. Additional information on hydronic system design may be found in Installation of Residential Hydronic Systems (Pub. #200) published by the Hydronics Institute in Berkeley Heights, NJ. The components in this system and their purposes are as follows:

1)Relief valve (Included & Required) – Install the relief valve in the 3/4” connections on the top of the boiler as shown in Figure 9.3. The relief valve shipped with the boiler is set to open at 30 psi. This valve may be replaced with one having a setting at or below the Maximum Allowable Working Pressure (MAWP) shown on the ASME plate attached to the heat exchanger. If the valve is replaced, the replacement must have a relief capacity in excess of the Minimum Relief Valve Capacity shown on the rating plate.

Pipe the discharge of the relief valve to a location where water or steam will not create a hazard or cause property damage if the valve opens. The end of the discharge pipe must terminate in an unthreaded pipe. If the relief valve discharge is not piped to a drain, it must terminate at least 6 inches above the floor. Do not run relief valve discharge piping through an area that is prone to freezing. The termination of the relief valve discharge piping must be in an area where it is not likely to become plugged by debris.

DANGER

•Pipe relief valve discharge to a safe location.

•Do not install a valve in the relief valve discharge line.

•Do not move relief valve from factory specified location.

•Do not plug relief valve discharge.

2)Circulator (Included & Required) – This boiler is equipped with a factory piped circulator, which is often the only circulator required. Figure 9.2 is a performance curve for this circulator. Note that this curve is has been adjusted to take into the account of all internal boiler piping. This performance curve therefore shows the amount of flow that can be achieved at various heating system pressure drops.

3)Throttling Valve or Flow Restrictor - This boiler is equipped with a differential pressure switch to prove that there is flow through the boiler before allowing it to fire. Reliable operation of this switch requires that there be a head loss across the heating system of at least 5.1ft wc. In order to assure that this head loss will always be present, either a throttling valve must be installed as shown in Figure 9.1 or the flow restrictor shown in Figure 9.4 must be installed. Use the following guidelines to determine which device to use:

•If the boiler is installed an a single zone system, or one having zone valves, install the throttling valve. At start- up, start with this valve fully open and then close it just enough to obtain reliable operation of the pressure switch.

•If the boiler is connected to a primary-secondary system (Figure 9.5), install the orifice in the supply tailpiece as shown in Figure 9.4.

•If the boiler is connected to a circulator zone system, primary-secondary piping must be used. Install the orifice as shown in Figure 9.4.

36

Page 37 Page 39
Page 38
Image 38
Crown Boiler MWC116ENT, MWC Series, MWC116ENL, MWC116ELL, MWC116ELT manual IX System Piping, Standard Piping
Page 37 Page 39

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.
Top Page Image Contents