Attachment Of Flue Covers; Oxygen Corrosion - Burnham 5B Series Installation And Operation Manual

SecTiON iii – iNSTALLATiON iNSTRUcTiONS (continued)
FIG. 10
SEALING OF BASE, INSTALLATION OF
FLUE COVERS AND CANOPIES
13.
INSTALL FLUE COVER PLATES over cleanout
openings on Front and Rear of Boiler. Use ¼" Carriage
Bolts installed at top and bottom of flue openings and
secure with washer and jam nut to provide a fixed
stud. Install flue cover plates over studs with insulation
against Boiler and secure with washers and nuts, see
Fig. 11.
14.
CONNECT SUPPLY AND RETURN PIPING TO
HEATING SYSTEM.
CLEARANCES – Steam and Hot water pipes shall
have clearances of at least ½" from all combustible
construction.
NOTice
Before using copper for steam piping, consider
the following characteristics of copper piping:
1) high coefficient of thermal expansion can
induce mechanical stresses and cause expansion/
contraction noises if not accounted for in the
piping system design and installation,
2) high heat transfer rate (heat loss) of uninsulated
copper piping must be included in the normal
piping and pickup factors used to size the boiler,
3) soldering or brazing pastes and fluxes that end
up in the system can cause poor heat transfer,
surging, and unsteady water line and wet steam
if not thoroughly removed during the boil out
procedure and,
4) galvanic corrosion of the adjoining metal may
occur due to dissimilar metals in certain water
chemistries if dielectric unions are not used.
FIG. 11

ATTACHMENT OF FLUE COVERS

a. With Steam Heating System, refer to Fig. 12, 13, 14
or 15.
b. With Forced Circulation HOT WATER HEATING
SYSTEMS, see Fig. 16A and 16B. For additional
reference, consult I=B=R Installation and Piping
Guide No. 250.
NOTE: When Hot Water Heating Boilers are
connected to Heating Coils located in Air Handling
Units where they may be exposed to refrigerated
air circulation, the Boiler Piping System must
be equipped with Flow Control Valves or other
automatic means to prevent gravity circulation of
the Boiler Water during the cooling cycle.
c. With COMBINATION HEATING AND COOLING
(REFRIGERATION) SYSTEMS having the same
Distributing Units, Piping and Circulator, See Fig.
17. For additional reference, consult ASHRAE
Systems Handbook 2008 Edition.
d. NOTE: Valves must be installed in the supply and
return branches to the Heating Boiler and Water
Chiller so as to prevent circulation of Chilled Water
through the Boiler or Heated Water through the
Chiller.

OXYGEN CORROSION:

Oxygen contamination of the boiler water will cause
corrosion of the iron and steel boiler components,
which can lead to failure. As such, any system must
be designed to prevent oxygen absorption in the first
place or prevent it from reaching the boiler. Problems
caused by oxygen contamination of boiler water are not
covered by Burnham's standard warranty.
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