Midco DS45B - Manual (Page 3)

Part 1 Installation
Part 1
Installation
Continued
IV Chimney, Vent
Connector*, and
Draft Control
*Formerly referred
to as Flue Pipe
3
In the case of wet base boilers, where the entire firing chamber is comprised of heat
exchange surfaces and no chamber liner was provided for oil firing, a liner is usually not
required for the ECONOMITE. However, a liner or target wall may be necessary if the firing
chamber is unusually short, in order to avoid flame contact on the heat exchanger walls or
flueways.
If a built up chamber liner is required, use 2300 o F minimum insulating material.
The burner tube, or the stainless steel sleeve that is included with the burner, must be
sealed air tight into the combustion chamber liner opening with refractory material as shown
by Figures 1 and 2. The sleeve is preferred as it is designed to properly locate the end of
the tube relative to the inside wall of the combustion chamber, and to permit burner removal
without breaking the seal.
NOTE: In no case should the burner tube be allowed to extend into the chamber proper; it
must be set flush to 1" short of the inside surface, because high combustion chamber
temperatures will cause premature electrode deterioration.
Special heat resistant alloy extension tubes and instructions are available for those
applications where the burner tube is too short to reach the combustion chamber (such as
old-fashioned gravity warm air furnace installations).
WARNING: Burner cabinet must be mounted in orientation shown in Figures
1 and 2. Any other mountings may cause a dangerous condition, and will void burner
warranty and agency approvals. Non-standard arrangements may be available for
some models; consult factory for details if required.
Before permanently setting the burner in place, check that the venturi casting openings
are free of foreign materials and the electrodes have not been damaged or displaced. See
Figure 6.
______________________________________________________
The chimney shall be inspected
for unsafe conditions such as
deteriorated masonry and
excessive soot or other blockage
or potential blockage.
The Vent Connector shall be
connected to a chimney already
venting solid fuel burning
equipment, an incinerator or an
open fireplace.
The Vent Connector shall be
made of non-combustible,
corrosion resistant material
capable of withstanding the vent
gas temperature produced by the
gas utilization equipment and of
sufficient thickness to withstand
physical damage.
The Vent Connector shall be as
short as possible. The entire
length shall be readily accessible
for inspection, cleaning and
replacement.
III Combustion Chamber
Continued
Figure 1: Dry Base Boiler with Combustion
Chamber Liner (Warm Air Furnace
Construction is Similar)
Figure 2: Wet Base Boiler with Unlined
Combustion Chamber
Figure 3: Draft Hood Positions