PB Heat MI/MIH series manual Annually Before Start of Heating Season

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MAINTENANCE

E.ANNUALLY (BEFORE START OF HEATING SEASON)

DANGER

When servicing or replacing components, be absolutely certain that the following conditions are met:

Water, gas and electricity are off.

The boiler is at room temperature.

There is no pressure in the boiler.

1.Check flueways and burners for cleanliness and clean if necessary. Use the following procedure if cleaning is required:

a.Refer to the Lighting/Operating Instructions in Figures 7.4 and 7.5 to properly turn off the gas to the boiler.

b.Turn off all electrical power to the boiler.

c.Remove burners and brush orifice spuds lightly using a soft bristle brush.

d.Remove the vent pipe, vent damper, top jacket panels and flue collector/draft diverter. Remove baffles on MIH models.

e.Brush flueways with wire brush.

f.To the extent possible, inspect inside of vent pipe and vent damper for obstructions in flow or vent damper movement. Remove or replace as necessary.

g.Re-install baffles on MIH models. When replacing the flue collector/draft hood, be certain that the blanket seal between the flue collector and top section makes a tight seal to prevent leakage of the products of combustion.

h.Re-install the top of the jacket, vent damper and vent pipe.

i.Re-install burners.

2.Inspect entire venting system for corrosion, support and joint integrity. Repair as necessary.

3.Check the pilot and main burner flame. See Figures

9.1and 9.2. The pilot should provide a steady flame enveloping 3/8to 1/2(1 cm to 1.2 cm) of the flame sensor. If required, adjust the pilot as stated in the gas valve manufacturer’s instructions or

paragraph 7.D. The main burner flame inner cone should be approximately 1-1/2(4 cm) high and should have a very sharp, blue color characteristic.

Figure 9.1: Standing Pilot and Main Burner Flame

Figure 9.2: Intermittent Pilot and Main

Burner Flame

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Contents Series MI/MIH Table of Contents Special Attention Boxes Using this ManualInstallation Sequence AIR for Combustion and Ventilation PreinstallationAccessibility Clearances Clearance from Combustible ConstructionAir 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 SystemsFreeze Protection Expansion TankINDIRECT-FIRED Water Heater Integral Draft Hood Vent Damper Installation GeneralVenting 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 Electrical Wiring ControlsZoned System Wiring 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 Control Descriptions Adjustment of GAS Pressure RegulatorAdjustment of Pilot GAS Flow Checking Burner Input CHECK-OUT ProcedureSTART-UP Procedures Troubleshooting Guides TroubleshootingProblem Possible Causes Corrective Actions Intermittent Ignition System Troubleshooting Sequence Maintenance Monthly with Boiler in USE GeneralDaily with Boiler in USE Weekly 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.