Crown Boiler TWZ120, TWZ200, TWZ090, TWZ125, TWZ065, TWZ175, TWZ150 Viii Tankless Heater Piping, 1615

Page 16

VIII TANKLESS HEATER PIPING

If the TWZ is installed with an optional tankless heater, pipe the heater as shown in Figure 14. The components in this system and their functions are as follows:

1)Mixing Valve (Required) - During the heating season, the water exiting the tankless heater may be 180 degrees or more. The mixing valve blends hot water leaving the tankless heater with cold water so as to maintain the hot water supplied to the fixtures at a fixed temperature. This saves energy, increases the amount of usable hot water available to the homeowner, and reduces the risk of scalding.

Install a mixing valve with a setting range of approximately 110 to 130F. Follow the manufacturer’s instructions for installing this valve. Usually a “heat trap” will be required between the coil and the “hot” connection on the mixing valve.

WARNING

A mixing valve does not eliminate the risk of scalding.

•Set the mixing valve and boiler low limit adjustments as low as possible.

•Feel water before showering or bathing.

•If anti-scald or anti-chill protection is required, use devices specifically designed for such service. Install and maintain these devices in accordance with the manufacturer’s instructions. Do not use the mixing valve as a substitute for pressure balancing valves or other devices required by plumbing codes to protect against scalding.

2)Flow Restrictor (Recommended) - If water is drawn from the tankless coil at a rate in excess of the rating in Table 1b, the temperature of the hot water may be too low to be of use. The use of a flow restrictor will prevent this problem by limiting the rate at which water can pass through the tankless heater. If a restrictor is used, select one having a rating in GPM approximately equal to the rating shown in Table 1b. If possible, locate this restrictor at least 3 feet from the tankless heater inlet so that it is not subjected to excessive temperatures when no water is flowing through the coil.

3)Pressure Relief Valve (Required) - Limits the pressure in the tankless heater and piping. Use an ASME constructed valve designed for domestic water service, such as the Watts #3L. Note that this is a pressure relief valve, not a T&P valve. Select a valve with a pressure setting less than or equal to the working pressure marked on the tankless coil. Pipe the discharge to a safe location using piping the same size as the discharge connection on the valve.

4)Hose Bib Valves (Recommended) - These valves permit the coil to be periodically “backflushed” to remove sediment.

5)Globe or Ball Valve (Recommended) - Used to adjust the flow through the entire tankless heater system if needed.

6)Unions (Required) - Tankless heaters may require periodic gasket replacement or other maintenance which requires removal of the heater from the boiler. Install unions anywhere in the tankless heater piping that will facilitate removal of the heater.

1615

Page 15 Page 17
Image 16
Page 15 Page 17
Contents TWZ Series II Specifications Table of ContentsProduct Description III Before Installing General SpecificationsIV Locating the Boiler Frontview Side View Air for Combustion and Ventilation For Buildings of Other than Unusually Tight ConstructionBoiler Installed in Confined Space ALL AIR from Inside For Buildings of Unusually Tight ConstructionALL AIR from Outdoors Ventilated Crawl Space and Attic ALL AIR from OUTDOORS, Using VI Venting 109Minimum Recommended Breeching Chimneysize 1110VII System Piping StandardPiping1312 Piping for Special Situations 1413Isolation of Boiler from System Viii Tankless Heater Piping 1615IX Fuel Line Piping 17161817 ONE-PIPE Lift System1918 TWO-PIPE Gravity Feed SystemWiring Single Zone WiringWiring Variations 2019Wiring DIAGRAM, Single Heating Zone only XI Start-up and Checkout 22212223 2423 Boiler ModelXII Service and Maintenance 25242625 Avoid Breathing Fiber Particulates and Dust 27262827 KEY # Description QTY. or Quantity PER Boiler or Crown P.NPage 3029 Quantity PER Boiler or Crown P.N3130 PN980270 Rev609/10

TWZ150, TWZ125, TWZ065, TWZ075, TWZ100 specifications

Crown Boiler, known for its solid and reliable heating solutions, has designed the TWZ series to provide effective heating for both residential and commercial applications. The models in this series—TWZ090, TWZ120, TWZ175, TWZ200, and TWZ100—offer varying capacities and features tailored to meet diverse heating needs.

One of the key features of the TWZ series is its efficiency. These boilers are designed with a cast-iron heat exchanger that maximizes thermal efficiency, allowing for optimal heat transfer. This not only helps in reducing energy consumption but also ensures that the home remains warm and comfortable during the colder months. With an annual fuel utilization efficiency (AFUE) rating that can reach up to 85%, users can expect lower energy bills as well.

Each model in the TWZ series is equipped with a durable and robust construction. The cast iron sections provide increased resistance to wear and tear, making the TWZ series a long-lasting solution for heating needs. This is particularly beneficial for users looking for reliability over time, as the longevity of these boilers reduces the need for frequent replacements.

In terms of technology, the TWZ series features advanced controls that enhance functionality and ease of use. These boilers are compatible with various heating control systems, allowing users to fine-tune their heating setup according to their specific requirements. The inclusion of a flame safeguard system further ensures safety during operation, reducing the risk of malfunctions and improving overall reliability.

The TWZ series is designed for easy installation and maintenance. With options for direct venting or conventional chimney venting, homeowners and installers can choose the most suitable configuration for their properties. Additionally, the maintenance access points on these boilers make routine service checks simple and efficient, ensuring that the boilers remain in optimal condition.

Another important characteristic of the Crown Boiler TWZ series is its quiet operation. Advanced engineering minimizes noise production, making these boilers ideal for residential settings where peace and comfort are valuable.

In conclusion, the Crown Boiler TWZ090, TWZ120, TWZ175, TWZ200, and TWZ100 models offer a compelling combination of efficiency, durability, advanced technology, and user-friendly features. Whether for residential or light commercial use, they represent an excellent choice for anyone seeking reliable heating solutions.
Top Page Image Contents