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8
Figure 6
B. Pinch the black strain relief bushing installed in the
jacket right side panel to dislodge it from the jacket
and pull just enough of the black power cord out so
the blocked vent switch will reach the near side of
the draft hood skirt. Do not pull out more power
cord than necessary.
C. Position the mounting bracket (with switch attached)
onto the lower edge of the draft hood skirt by
locating the center tooth (with the #10 sheet metal
screw) on the outside and the other two teeth inside
the draft hood skirt. See Figure 6.
D. Slide the mounting bracket up tight against the
lower edge of the draft hood skirt, so that the #10
sheet metal screw is above the skirt's stiffening rib.
E. Secure the bracket in this position by tightening the
#10 sheet metal screw against the outer surface of
the draft hood skirt.
F. Reinsert the excess power cord through the jacket
side panel hole to take the slack out of the power
cord running up to the blocked vent switch.
G. Reposition the strain relief bushing around the
power cord at the jacket side panel, pinch the two
halves of the bushing together, and snap it back into
the hole in the jacket side panel to secure the power
cord to the jacket.
H. Be sure the power cord, mounting bracket, and
switch are secure and located as shown in Figure 6.
To perform a long term pressure test including the
boiler, ALL trapped air must rst be removed from
the boiler.
A loss of pressure during such a test, with no visible
water leakage, is an indication that the boiler
contained trapped air.
K. 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 rst
place or prevent it from reaching the boiler.
Problems caused by oxygen contamination of boiler
water are not covered by Burnham's standard
warranty.
There are many possible causes of oxygen
contamination such as:
1. Addition of excessive make-up water as a result
of system leaks.
2. Absorption through open tanks and ttings.
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 ttings which allow
oxygen absorption.
4. Use of non-permeable materials in the
distribution system.
5. Isolating the boiler from the system water by
installing a heat exchanger.
10. INSTALL DRAFT HOOD without modication on
outlet of ue collector (See Figure 1). Secure with sheet
metal screws.
WARNING
Do not alter boiler draft hood or place any
obstruction or non-approved damper in the
breeching or vent system. Flue gas spillage can
occur. ETL certication will become void.
11. INSTALL BLOCKED VENT SWITCH
The blocked vent switch assembly shipped taped to the
top of the boiler includes a power cord and a switch
attached to a mounting bracket. The mounting bracket
has a three tooth staggered comb stamping at one end
with a #10 sheet metal screw in the center tooth.
A. Untape the blocked vent switch assembly from the
top of the boiler and uncoil the power cord.