Burnham 20_PV_I manual III. Water Piping and Trim

III. Water Piping and Trim

CAUTION

Failure to properly pipe boiler may result in improper operation and damage to boiler or building.

A.Design and install boiler and system piping to prevent oxygen contamination of boiler water.

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.

Oxygen contamination sources are system leaks requiring addition of makeup water, fittings, and oxygen permeable materials in distribution system. Eliminate oxygen contamination by repairing system leaks, repairing fittings, and using nonpermeable materials in distribution system.

B.Connect system supply and return piping to boiler. See Figure 3. Also consult I=B=R Installation and Piping Guides. Maintain minimum ½ inch clearance from hot water piping to combustible materials.

C.Install Circulator with flanges, gaskets and bolts provided. Five foot circulator harness allows circulator to be mounted on supply or return. Connect harness to circulator and secure any excess conduit.

D.Install Safety Relief Valve. See Figure 3. Safety Relief Valve must be installed with spindle in vertical position. Installation of the relief valve must be consistant with the ANSI/ASME Boiler and Pressure Vessel Code, Section IV.

WARNING

Safety relief valve discharge piping must be piped near floor to eliminate potential of severe burns. Do not pipe in any area where freezing could occur. Do not install any shut-off valves.

E.Install Drain Valve in ¾" NPT connection in tee provided. See Figure 1.

F.Space heating and domestic water heating with Alliance water heater. Install Alliance water heater as a separate heating zone. Refer to Alliance Installation, Operating and Service Instructions for additional information.

G.If boiler is used in connection with refrigeration systems , boiler must be installed with chilled medium piped in parallel with the heating boiler using appropriate valves to prevent chilled medium from entering boiler, see Figure 4. Also consult I=B=R Installation and Piping Guides.

H.If boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air, boiler piping must be equipped with flow control valves to prevent gravity circulation of boiler water during operation of cooling system.

I.Use a boiler bypass 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.).

Install pipe tee between circulator and boiler return along with second tee in supply piping as shown in Figure 3. Bypass should be same size as the supply and return lines with valves located in bypass and supply outlet as illustrated in Figure 3 in order to regulate water flow to maintain higher boiler water temperatures.

After the boiler is operational (reference Section VII. System Start-Up) set by-pass and boiler supply valves to half throttle position to start. Operate boiler until system water temperature reaches normal operating range. Adjust valves to provide 180° to 200°F supply water temperature. Opening the boiler supply valve will raise system temperature, while opening the by-pass valve will lower system supply temperature.

J.A hot water boiler installed above radiation level must be provided with a low water cut-off device as part of installation.

K.Oil, grease, and other foreign materials which accumulate in new hot water boilers and a new or reworked system should be boiled out, and then thoroughly flushed. A qualified water treatment chemical specialist should be consulted for recommendations regarding appropriate chemical compounds and concentrations which are compatible with local environmental regulations.

L.After the boiler and system have been cleaned and flushed, and before refilling the entire system add appropriate water treatment chemicals, if necessary, to bring the pH between 7 and 11.

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