PB Heat MI/MIH series manual Venting, Integral Draft Hood, Vent Damper Installation General

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VENTING

4. VENTING

A.INTEGRAL DRAFT HOOD

1.The MI/MIH boiler is equipped with a built-in draft hood. This device is designed to:

a.provide for the ready escape of flue gases from the boiler in the event of no draft.

b.prevent a backdraft from entering the boiler.

c.control stack draft during operation.

These tasks are accomplished without the extra height requirements of a separate draft hood.

2.The draft hood relief opening is the large rectangular passage at the front of the boiler. Make certain that there are no obstructions to airflow in front of this opening.

3.A vent safety shut-off switch is located within the draft relief opening to shut off the boiler in case of a blocked vent condition. See Section 7B for details regarding this device. See Figure 6.1 in Section 6 (Electrical) for spill switch location.

4.The vent damper can be mounted directly onto the round draft hood outlet (vent connector) on top of the boiler, or in vent piping close to the boiler. See the Vent Damper Installation Instructions below.

Figure 4.1: Venting Multiple Appliances

B.VENT DAMPER INSTALLATION – GENERAL

1.Do not use one vent damper to control two or more heating appliances. See Figure 4.1.

2.Follow these and the installation instructions that are included with the vent damper. Observe the cautions and warnings that accompany all instructions.

3.Make certain that minimum clearances provided in the vent damper manufacturer’s instructions are maintained and that adequate space is available for damper access and service.

4.Orient the damper operator to facilitate connection of the harness with the vent damper and boiler. Note flue gas flow arrow on vent damper and orient as required. For installation with damper mounted in vertical position, see Figure 4.2. For installation with damper mounted in horizontal position, mount the unit as shown in Figure 4.3 to avoid excessive heat on the operator or condensation drips into the operator.

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Contents Series MI/MIH Table of Contents Installation Sequence Using this ManualSpecial Attention Boxes Accessibility Clearances PreinstallationClearance 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 Planning the Layout Installation SurveyBoiler SET-UP Boiler Supply and Return Water Piping and ControlsParallel Hook-Up with Water Chiller Safety Relief ValveZone Piping with Zone Valves Piping for Zoned SystemsINDIRECT-FIRED Water Heater Expansion TankFreeze Protection Venting Vent Damper Installation GeneralIntegral Draft Hood Venting with Vent Damper in Vertical Position Vent Piping and ChimneySeal any unused openings in the common venting system Boiler Removal from Common Venting SystemGas Connection to Boiler GAS PipingMIH Boiler Natural Gas Zoned System Wiring Wiring ControlsElectrical Sequence of Operation Wiring and Connection Diagram Intermittent Ignition Intermittent Ignition System Operating Sequence Zone Wiring with Zone Valves Completing the Installation START-UP ProceduresValve Tapping and Adjustment Screw Locations Operating Instructions For Your Safety Read Before Lighting Adjustment of Pilot GAS Flow Adjustment of GAS Pressure RegulatorControl Descriptions Checking Burner Input CHECK-OUT ProcedureSTART-UP Procedures Troubleshooting Guides TroubleshootingProblem Possible Causes Corrective Actions Intermittent Ignition System Troubleshooting Sequence Maintenance Daily with Boiler in USE GeneralWeekly with Boiler in USE Monthly with Boiler in USEStanding Pilot and Main Burner Flame Annually Before Start of Heating SeasonSeries MI/MIH Boiler Dimensions Boiler Dimensions & RatingsRepair Parts Series MI/MIH GAS Boiler Repair Parts2Manifold 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.