Figure 16: Cad Cell

Before pressing the reset button call your service- man immediately.

CAUTION

Do not attempt to start the burner when excess oil has accumulated, when the unit is full of vapor, or when the combustion chamber is very hot.

11. CHECK FOR CLEAN CUT OFF OF BURNER

A.AIR IN THE OIL LINE between fuel unit and nozzle will compress when burner is on and will expand when burner stops, causing oil to squirt from nozzle at low pressure as burner slows down and causing nozzle to drip after burner stops. Usually cycling the burner operation about 5 to 10 times will rid oil line of this air.

B.IF NOZZLE CONTINUES TO DRIP, repeat step (11A). If this does not stop the dripping, remove cutoff valve and seat, and wipe both with a clean cloth until clean, then replace and re-adjust oil pressure.

12.TEST CONTROLS.

WARNING

Before installation of the boiler is considered complete, the operation of the boiler controls should be checked, particularly the primary control and high limit control.

A.Check Thermostat operation. Raise and lower thermostat setting as required to start and stop burner.

B.VERIFY PRIMARY CONTROL SAFETY FEA- TURES using procedures outlined in instructions furnished with control or instructions below:

CAUTION

FOR HEATING SERVICEMAN ONLY

(1) Safe Start

i.Jumper the yellow cad cell leads.

ii.Follow procedure to turn on burner. Burner must not start, indictor light turns on and control remains in Idle Mode.

(2)Simulate Flame Failure.

i.Follow procedure to turn on burner.

ii.Close hand valve in oil supply line.

iii.Device enters recycle mode.

iv.Device tries to restart system after approximately 60 seconds.

v.Safety switch locks out approximately in safety switch timing indicated on label.

Indicator light flashes at 1 Hz rate.

Ignition and motor stop and oil valve closes.

(3)Simulate Ignition Failure.

i.Follow procedure to turn on burner, but do not open oil supply hand valve.

ii.Observe that safety switch locks out approximately within safety switch timing as indicated on the label. Indicator light flashes at 1 Hz rate. Ignition and motor stop and oil valve closes.

(4)The indicator light on the oil primary control provides lockout, recycle and cad cell indica- tions as follows:

i.Flashing at 1 Hz (½ second on, ½ second off): system is locked out or in restricted mode.

ii.Flashing at ¼ Hz (2 seconds on, 2 seconds off): control is in recycle mode.

iii.On: cad cell is sensing flame.

iv.Off: cad cell is not sensing flame.

C. CHECK HIGH LIMIT CONTROL. Jumper thermostat terminals. Allow burner to operate until shut-down by limit. Installation is not considered complete until this check has been made.

REMOVE JUMPER.

IF CONTROLS DO NOT MEET REQUIREMENTS OUTLINED IN PARAGRAPH 12, REPLACE CONTROL AND REPEAT CHECK-OUT PROCEDURES.

13.BOILER AND SYSTEM CLEANING INSTRUC- TIONS FOR TROUBLE FREE OPERATION

A. Filling of Boiler and System — General —-In a hot water heating system, the boiler and entire system (other than the expansion tank) must be full of water for satisfactory operation. Water should be added to the system until the boiler pressure gauge registers 12 psi. To insure that the system is full, water should come out of all air vents when opened. The LE boiler holds 6.1 gallons of water.

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Burnham L7248 manual Check for Clean CUT OFF of Burner, Test Controls
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L7248 specifications

The Burnham L7248 is a notable model in the realm of heating solutions, designed specifically for residential and commercial use. Renowned for its efficiency and reliability, the L7248 embodies innovative technology combined with user-friendly features, catering to diverse heating needs.

One of the key features of the Burnham L7248 is its advanced heating technology. It employs a gas-fired system that provides both hot water and space heating. This dual-function capability ensures that homes remain warm and comfortable during the colder months while also supplying hot water for daily use. The integrated control system allows users to manage the heating effectively, ensuring maximum comfort with minimal energy expenditure.

The L7248 is designed with durability in mind. Constructed from high-quality materials, the boiler is built to withstand the rigors of regular use while maintaining peak performance. Its advanced heat exchanger design enhances efficiency by ensuring optimal heat transfer, which translates to lower energy costs and a reduced environmental footprint. Furthermore, the unit operates quietly, providing a peaceful environment without intrusive noise.

In terms of safety, the Burnham L7248 incorporates several features that protect both the system and the home. It is equipped with advanced safety controls that monitor pressure and temperature, preventing potential hazards. Additionally, the unit’s design allows for easy servicing and maintenance, ensuring that it remains in good working condition for many years.

Energy efficiency is another hallmark of the Burnham L7248. With an impressive AFUE (Annual Fuel Utilization Efficiency) rating, the model significantly reduces fuel consumption, helping homeowners save on energy bills while promoting sustainability. The boiler is also compatible with various smart home technologies, allowing users to integrate it into their existing systems for enhanced control and efficiency.

Overall, the Burnham L7248 stands out for its combination of innovative technology, safety features, and energy efficiency. Whether for residential or commercial applications, it provides a solid, reliable heating solution that meets the demands of modern living. With its user-focused design and robust performance characteristics, the Burnham L7248 is an excellent investment for those seeking dependable and efficient heating.
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