Burnham L7248 manual

4. INSTALL BOILER CONTROL.

A. Pull bulb and capillary tube out of hole in back of control. Insert bulb in immersion well on top of boiler and secure control with set screw in control.

B. Secure flexible conduit to Jacket Wrapper side with conduit clamp and sheet metal screw. Conduit must be on same side of boiler as Swing Door hinges.

5. MOVE BOILER TO PERMANENT POSITION by sliding or walking.

6. INSPECT FRONT AND REAR DOOR INSULATION

PIECES AND COMBUSTION CHAMBER LINER

A. OPEN SWING DOOR on front of boiler. Use flashlight to inspect insulation pieces secured to front and rear doors. Inspect Ceramic Fiber Blanket secured to bottom of combustion chamber with water glass adhesive. Replace any damaged pieces.

7. CONNECT SUPPLY AND RETURN PIPING TO HEATING SYSTEM

A. Hot water pipes shall have clearances of at least ½” from all combustible construction.

B. Use a system by-pass if the boiler is to be operated in a system which has a large volume or excessive radiation where low boiler water temperatures may be encountered (i.e. converted gravity circulation system, etc.).

Valves should be located in the by-pass and return line as illustrated in Figures 4 and 5 in order to regulate water flow for maintenance of higher boiler water temperature.

Set the by-pass and return valves to a half throttle position to start. Operate boiler until the system water temperature reaches its normal operating range.

Adjust the valves to maintain 180°F to 200°F boiler water temperature and greater than 120°F return temperature. Adjust both valves simultaneously. Closing the boiler return valve while opening the by-pass valve will raise the boiler return tempera- ture. Opening the boiler return valve while closing the by-pass valve will lower the boiler return temperature.

C. If this boiler is used in connection with refrigeration

systems, the boiler must be installed so that the chilled medium is piped in parallel with the heating boiler using appropriate valves to prevent the chilled medium from entering the boiler, see Figure 6. Also consult I=B=R Installation and Piping Guides.

D. If this boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air the boiler piping must be equipped with flow control valves to prevent gravity circula- tion of boiler water during the operation of the cooling system.

Figure 6: Recommended Piping for Combination Heating & Cooling (Refrigeration) Systems

E.A hot water boiler installed above radiation level must be provided with a low water cutoff device as part of the installation.

If a low water cut-off is required, it must be mount- ed in the system piping above the boiler.

The minimum safe water level of a hot water boiler is just above the highest water containing cavity of the boiler; that is, a hot water boiler must be full of water to operate safely.

F.There are many possible causes of oxygen contami- nation such as:

(1)Addition of excessive make-up water as a result of system leaks.

(2)Absorption through open tanks and fittings.

(3)Oxygen permeable materials in the distribution system.

In order to insure long product life, oxygen sources should be eliminated. This can be accomplished by taking the following measures:

(1)Repairing system leaks to eliminate the need for addition of make-up water.

(2)Eliminating open tanks from the system.

(3)Eliminating and/or repairing fittings which allow oxygen absorption.

(4)Use of non-permeable materials in the distribu- tion system.

(5)Isolating the boiler from the system water by installing a heat exchanger.

CAUTION

Oxygen contamination of boiler water will cause corrosion of iron and steel boiler components, and can lead to boiler failure. Burnham's standard warranty does not cover problems caused by oxygen contamination of boiler water.