Heat Exchanger Cleaning Procedure

disturbed during the inspection process for leaks.

1)Turn off electrical power and gas supply to the boiler

2)Disconnect the damper and vent connector from the boiler.

3)Remove the upper front and top jacket panels. If possible, remove the rear and left side jacket panels

4)Remove the burners.

5)Remove the blocked vent (“spill”) switch

6)Remove the ¼-20 nuts and washers holding the flue collector onto the heat exchanger.

7)Carefully remove the flue collector gasket strips and set them aside.

8)Remove the flue collector from the heat exchanger.

9)Clean the flue passageways using a stiff bristle brush. Be certain that all foreign material is removed from the gaps between the pins

10)Clean the bottom surfaces of the heat exchanger

11)Put a light in the combustion chamber and look through the flue passages from the top to verify that they have been thoroughly cleaned.

12)Replace the flue collector gasket strips. If desired, RTV silicone sealant with a 500F intermittent duty temperature may be substituted for this rope gasket. The flue collector must be thoroughly sealed to the heat exchanger.

13)Replace the ¼-20 nuts and washers that hold down the flue collector

14)Reattach all the jacket components.

15)Reinstall burners, being careful to put the pilot main burner in its original location.

WARNING

SOOT DEPOSITS IN THE FLUE PASSAGES ARE A SIGN THAT THE BOILER MAY BE OPERATING AT HIGH CARBON MONOXIDE (CO) LEVELS. AFTER CLEANING THE BOILER OF SOOT DEPOSITS, CHECK THE CO LEVEL IN THE FLUE GAS TO INSURE THAT THE BOILER IS OPERATING PROPERLY.

If it is necessary to check CO, use a combustion analyzer, or other instrument which is designed to measure CO in flue gas. A CO “sniffer” designed for testing CO levels in ambient air cannot be used to check boiler combustion. Take a flue gas sample by inserting a sample probe through the draft diverter opening and into the flue collector so that the sample is taken in the area directly over the heat exchanger. Do not take a sample until the boiler has been firing for at least five minutes.

A normal CO reading for a BSI series boiler is less than 50ppm (0.005%). A reading of more than 100ppm (0.01%) is indica- tive of a combustion problem.

Some causes of excessive CO include:

• Incorrectly sized main burner orifice for the altitude at which boiler is installed

• Crooked or out-of-round orifice holes (never attempt to drill orifice for this boiler in the field)

• Partially plugged flue passages

• Improper manifold pressure

• Foreign material in burner venturis or burner ports

• Leak in seal between flue collector and heat exchanger

• Inadequate supply of combustion air

16) Replace the blocked vent switch.

17) Reconnect the damper and vent system.

BSI069, BSI345, BSI207, BSI172, BSI241 specifications

Crown Boiler Company is renowned for its high-quality heating solutions, with a diverse range of models designed to meet various residential and commercial needs. Among their popular offerings are the BSI series, which includes the BSI379, BSI138, BSI310, BSI276, and BSI103 models. Each of these boilers comes with distinct features, technologies, and characteristics that cater to different applications and preferences.

The Crown Boiler BSI379 is a powerful and efficient boiler designed for residential use. It features a stainless steel heat exchanger that enhances durability and improves heat transfer efficiency. The BSI379 operates on natural gas, providing a high thermal efficiency rating which helps to reduce energy costs. With a compact design, it can fit conveniently in various installations, making it a versatile choice for homeowners.

The BSI138 model is another excellent option for smaller residential spaces. It is equipped with advanced technology that allows for quiet operation and minimal environmental impact. This boiler also offers a straightforward control interface, making it easy for homeowners to adjust settings according to their heating needs. The BSI138's lightweight construction and small footprint allow for flexible installation options.

Moving on to the BSI310, this model is designed for medium to larger-sized homes. It features an electronic ignition system that ensures reliable start-up while minimizing gas consumption. The BSI310 also incorporates multiple safety features, including pressure relief valves and limit controls, enhancing user safety during operation. Its robust design ensures efficient heating even in the coldest months.

The BSI276 model is characterized by its sealed combustion design, which improves indoor air quality by preventing drafts and ensuring that all combustion air is drawn from outside. This model is ideal for energy-conscious homeowners seeking environmentally friendly options. Its high-efficiency rating translates to significant energy savings over time, making it a financially wise investment.

Finally, the BSI103 is an entry-level model that retains the quality and reliability associated with Crown Boilers. It is particularly suited for smaller homes or apartments and offers ease of use and maintenance. The BSI103 combines affordability with efficiency, providing a cost-effective heating solution without compromising on performance.

In summary, the Crown Boiler BSI series, comprising the BSI379, BSI138, BSI310, BSI276, and BSI103, showcases a blend of innovative technologies and features. With options suitable for various household sizes and energy needs, Crown Boiler continues to deliver reliable heating solutions that cater to modern homeowners’ demands for efficiency, safety, and convenience. Each model's unique characteristics ensure that users can find the perfect boiler to meet their heating requirements.