PB Heat MI/MIH series manual Expansion Tank, INDIRECT-FIRED Water Heater, Freeze Protection

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WATER PIPING AND CONTROLS

D.EXPANSION TANK

1.Consult the tank manufacturer’s instructions for specific information relating to tank installation. Size the expansion tank for the required system volume and capacity. See Table 10.2 in Section 10 for boiler water content.

2.Expansion tanks are available with built-in fill valves and check valves for reducing supply water pressure and maintaining minimum system pressure. Check the design features of the tank and provide valves as necessary. Refer back to Figure 3.1 for typical expansion tank piping.

E.INDIRECT-FIRED WATER HEATER

If the boiler is to be used in conjunction with an indirect- fired water heater, refer to Figure 3.7 for typical piping. Follow the instructions provided by the water heater manufacturer. Pipe the water heater as a separate zone.

F.FREEZE PROTECTION

For new or existing systems that must be freeze- protected:

WARNING

Use only inhibited propylene glycol solutions of up to 50% by volume with water. Ethylene glycol is toxic and can attack gaskets and seals used in hydronic systems.

1.Glycol in hydronic applications is specially formulated for this purpose. It includes inhibitors which prevent the glycol from attacking metallic system components. Make certain that the system fluid is checked for the correct glycol concentration and inhibitor level.

2.The glycol solution should be tested at least once a year and as recommended by the glycol manufacturer.

3.Glycol solutions expand more than water. For example, a 50% by volume solution expands 4.8% in volume for a temperature increase from 32°F (0°C) to 180°F (82°C), while water expands 3% with the same temperature rise. Allowance must be made for this expansion in system design.

4.For more information, consult the PB Heat Water Installation Survey and the glycol manufacturer.

Figure 3.7: Typical Piping with Indirect-Fired Water Heater

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Contents Series MI/MIH Table of Contents Using this Manual Installation SequenceSpecial Attention Boxes Preinstallation Accessibility ClearancesClearance from Combustible Construction AIR for Combustion and VentilationAir Openings All Air from Indoors on Different Floors Air Openings All Air from Outdoors through Vertical Ducts Installation Survey Planning the LayoutBoiler SET-UP Water Piping and Controls Boiler Supply and ReturnSafety Relief Valve Parallel Hook-Up with Water ChillerPiping for Zoned Systems Zone Piping with Zone ValvesExpansion Tank INDIRECT-FIRED Water HeaterFreeze Protection Vent Damper Installation General VentingIntegral Draft Hood Vent Piping and Chimney Venting with Vent Damper in Vertical PositionBoiler Removal from Common Venting System Seal any unused openings in the common venting systemGAS Piping Gas Connection to BoilerMIH Boiler Natural Gas Wiring Controls Zoned System WiringElectrical Sequence of Operation Wiring and Connection Diagram Intermittent Ignition Intermittent Ignition System Operating Sequence Zone Wiring with Zone Valves START-UP Procedures Completing the InstallationValve Tapping and Adjustment Screw Locations Operating Instructions For Your Safety Read Before Lighting Adjustment of GAS Pressure Regulator Adjustment of Pilot GAS FlowControl Descriptions CHECK-OUT Procedure Checking Burner InputSTART-UP Procedures Troubleshooting Troubleshooting GuidesProblem Possible Causes Corrective Actions Intermittent Ignition System Troubleshooting Sequence Maintenance General Daily with Boiler in USEWeekly with Boiler in USE Monthly with Boiler in USEAnnually Before Start of Heating Season Standing Pilot and Main Burner FlameBoiler Dimensions & Ratings Series MI/MIH Boiler DimensionsRepair Parts Repair Parts Series MI/MIH GAS Boiler2Manifold Manifold/Gas Train MI Standing Pilot 3b Gas Valve and Pilot Intermittent 4Block/Draft Hood 4a Block/Draft Hood 5Jacket 6Controls/Circulator/Vent Damper Series MI/MIH

MI/MIH series specifications

The PB Heat MI/MIH series represents a significant advancement in the realm of cast iron boilers, engineered for high efficiency and reliable performance in both residential and light commercial applications. Crafted with exceptional care, these boilers combine traditional design elements with modern technologies to optimize heating capabilities.

A standout feature of the MI/MIH series is its construction. Made from high-quality cast iron, the boiler body is built to withstand the test of time while providing superior heat retention. This material ensures consistent heating over extended periods, reducing the need for frequent cycling on and off, which enhances overall efficiency.

The MI/MIH series incorporates a versatile design that accommodates various heating systems, including hot water heating and steam applications. This flexibility is a key selling point, as it allows homeowners and business operators to tailor their heating solutions to specific needs. Additionally, the units are compatible with multiple fuels, including oil and natural gas, making them a practical option for diverse environments.

Efficiency is another critical component of the MI/MIH series. The boilers are designed to operate at high efficiency levels, often surpassing industry standards. Many models in this series feature advanced combustion technology that maximizes fuel use while minimizing emissions. This not only supports environmental sustainability but also results in lower utility bills for consumers.

The MIH variant, specifically, offers additional features like an integrated secondary heat exchanger, which enhances heat transfer and further improves efficiency. Maintenance is made simple, thanks to thoughtful engineering. With large clean-out ports and easily accessible components, routine maintenance can be performed with ease, reducing downtime and extending the boiler's lifecycle.

Moreover, safety is a fundamental aspect of the MI/MIH series. These boilers include multiple safety features, such as automatic safety shutdown systems and built-in pressure controls, ensuring safe operation under various conditions.

In summary, the PB Heat MI/MIH series cast iron boilers stand out due to their durability, versatility, high efficiency, and robust safety features. These models cater to a range of heating requirements, making them a reliable choice for those seeking long-term heating solutions that prioritize both performance and sustainability. As homeowners and businesses look for dependable and efficient heating options, the MI/MIH series remains a prominent player in the industry.