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Table 2: Equivalent Length of Fittings Table 3: Specific Gravity Correction Factors
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 Fig. 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
Figure 3: Boiler Piping
covered by Burnham's standard warranty.
There are many possible causes of oxygen contamina-
tion 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 distribution
system.
5. Isolating the boiler from the system water by installing
a heat exchanger.
10. INSTALL DRAFT HOOD without modification on outlet
of flue collector (See Figure 1). Secure with sheet metal
screws.
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.
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.
Fitting
Nominal Pipe Size
½¾ 11¼
45° Ell 0.7 1 1.2 1.6
90° Ell 1.6 2.1 2.6 3.5
Tee (As Elbow) 3.1 4.1 5.2 6.9
Specific
Gravity
Correction
Factor
Specific
Gravity
Correction
Factor
0.50 1.10 1.30 1.07
0.55 1.04 1.40 1.04
0.60 1.00 1.50 1.00
0.65 0.96 1.6 0.97
0.70.931.70.94
0.75 0.9
0.8 0.87