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6
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.