Midco Economite RE4400DS - Manual (Page 3)

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A combustion chamber liner is normally required to protect non-heat transfer surfaces and to
provide a radiant bed for rapid heat transfer to the primary surfaces of the heat exchanger.
In most cases the existing chamber liner can be used, if in good condition.
? 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 excess flame contact on the heat exchanger
walls or flueways.
? If a built up chamber liner is required, use 2,300°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 opening with refractory material. 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.
CAUTION: In no case should the burner tube be allowed to extend into the
chamber proper; it must be set at least 1" short of the inside surface because high
combustion chamber temperatures will cause premature pilot, electrode, burner tube
and sleeve deterioration.
WARNING: BURNER 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 main burner ports are free
of foreign materials, and also that the spark electrode assembly has not been damaged or
displaced. See Figures 7A and 7B.
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WARNING: The chimney shall be inspected for unsafe conditions such as
deteriorated masonry and excessive soot or other blockage or potential blockage.
Installation must conform with local codes or in the absence of local codes with NFPA,
ANSI Z223.1 latest edition.
WARNING: The vent connector shall not 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.
? The length of horizontal uninsulated Vent Connector between the chimney and a single
gas utilization equipment shall not exceed 75% of the height of the chimney above the
connector, or 100% if the Vent Connector is insulated.
? The Vent Connector shall be installed so as to avoid turns or other construction features
which create excessive resistance to flow of vent gas. It shall be installed without any dips or
sags and shall slope upward at least 1/4" per foot.
? A manually operated damper shall not be placed in the Vent Connector or chimney of
any gas utilization equipment.
? The Vent Connector shall be firmly attached to draft hood outlets and flue collars. Joints
between sections of connector piping shall be fastened by sheet-metal screws or other
approved means. The Vent Connector shall be supported for the design and weight of the
material employed to maintain clearance and prevent physical damage and separation of
joints.
3
Part 1
Installation Continued
Part 1 Installation
Figure 1: Dry Base Boiler with Combustion
Chamber Liner (Warm Air Furnace
Construction is Similar)
Figure 2: Wet Base Boiler with Unlined
Combustion Chamber
III Combustion
Chamber
IV Chimney, Vent
Connector and
Draft Control