PB Heat MI/MIH series manual General, Daily with Boiler in USE, Weekly with Boiler in USE

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MAINTENANCE

A.GENERAL

1.Disconnect this boiler from the gas supply piping during any pressure testing of the gas system.

2.Check pipes adjacent to cold walls or in unheated spaces. Insulate and tape them if necessary to be sure they can’t freeze up. Keeping the water moving at all times will reduce the likelihood of freezing. See Section 3 for glycol instructions.

3.If there is considerable foreign matter in the boiler water, the boiler should be shut down and allowed to cool, then drained and thoroughly flushed out. Use the drain valve at the bottom of the return connection to drain the boiler. Pipe the drain cock to a suitable drain or containment device if a glycol solution is used. Flush the system to remove remaining matter. If there is evidence that hard scale has formed on the internal surfaces, the boiler should be cleaned by chemical means as prescribed by a qualified water treatment specialist.

4.There must not be signs of continuous wetness at the chimney. If signs of continuous wetness are observed, a qualified service agency must be consulted to modify the vent configuration to prevent the formation of condensate.

B.DAILY (WITH BOILER IN USE)

Daily boiler observation can be performed by the owner. If any potential problems are found, a qualified installer or service technician/agency must be notified.

1.Remove any combustible materials, gasoline and other flammable liquids and substances that generate flammable vapors from the area where the boiler is contained. Make certain that the boiler area has ample air for combustion and ventilation and that there are no obstructions to the free flow of air to and from the boiler.

2.Observe general boiler conditions (unusual noises, vibrations, etc.)

3.Observe operating temperature and pressure on the combination gauge located on the left side of the

boiler. Boiler pressure should never be higher than

5 psi (35 kPa) below the rating shown on the safety relief valve; 25 psig (172 kPa) maximum for a 30 psig (207 kPa) rating, 45 psig (310 kPa) maximum for a 50 psig (345 kPa) rating). The valve rating can be found on the top of the safety relief valve (see Figure 5 for location of the safety relief valve). Boiler temperature should never be higher than 250°F (121°C).

4.Check for water leaks in boiler and system piping.

5.Smell around the appliance area for gas. If you smell gas, follow the procedure listed in the Lighting/Operating Instructions in Section 7.

C.WEEKLY (WITH BOILER IN USE)

1.Flush float-type low-water cut-off (if used) to remove sediment from the float bowl as stated in the manufacturer’s instructions.

D.MONTHLY (WITH BOILER IN USE)

1.Check boiler room floor drains for proper functioning.

2.Check function of the safety relief valve (monthly unless specified otherwise by manufacturer) by performing the following test:

a.Check valve piping to determine that it is properly installed and supported.

b.Check boiler operating temperature and pressure.

c.Lift the try lever on the safety relief valve to the full open position and hold it for at least five seconds or until clean water is discharged.

d.Release the try lever and allow the valve to close. If the valve leaks, operate the lever two or three times to clear the valve seat of foreign matter. It may take some time to determine if the valve has shut completely.

e.If the valve continues to leak, it must be replaced before the boiler is returned to operation.

f.Check that operating pressure and temperature have returned to normal.

g.Check again to confirm that valve has closed completely and is not leaking.

3.Test low-water cut-off (if used) as described by the manufacturer.

4.Test limit as described in Section 7F, “Check-Out Procedure.”

5.Test function of gas safety shut-off features as described by gas valve and ignition control manufacturer.

6.Cycle the boiler at least once and check operation of the vent damper.

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Contents Series MI/MIH Table of Contents Installation Sequence Using this ManualSpecial Attention Boxes Clearance from Combustible Construction PreinstallationAccessibility Clearances 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 ValvesINDIRECT-FIRED Water Heater Expansion TankFreeze Protection Venting Vent Damper Installation GeneralIntegral 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 Zoned System Wiring Wiring ControlsElectrical 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 Pilot GAS Flow Adjustment of GAS Pressure RegulatorControl Descriptions CHECK-OUT Procedure Checking Burner InputSTART-UP Procedures Troubleshooting Troubleshooting GuidesProblem Possible Causes Corrective Actions Intermittent Ignition System Troubleshooting Sequence Maintenance Weekly with Boiler in USE GeneralDaily 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.
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