Midco Economite RE6850B - Manual (Page 3)

Clean the gas utilization equipment combustion chamber, heat exchanger interior, and flue
connections. Remove all adhering tars, scale, dirt and soot. Inspect for actual or potential
leaks.
Cement all joints, including those in the heating appliance base and around the door
frames, to prevent leakage into, or out of the combustion chamber.
The access or firing door should open easily to relieve pressure. If positive latches exist,
they should be modified to permit easy opening; a spring loaded door holder is
recommended.
On all boilers, make certain the pressure relief safety valve is in good operating condition.
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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, must be sealed air tight into the combustion chamber opening with
refractory material or with supplied ceramic fiber rope.
CAUTION: In no case should the burner tube be allowed to extend into the
chamber proper.
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 and pilot ports
are free of foreign materials, and also that the spark electrode assembly has not been
damaged or displaced. See Figure 6.
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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 the height of the chimney above the
connector, or 100% if the Vent Connector is insulated.
3
Part 1
Installation
Continued
Part 1 Installation
II Preparation of
the Gas Utilization
Equipment
III Combustion
Chamber
IV Chimney, Vent
Connector and
Draft Control
Figure 1: Dry Base Boiler with Combustion
Chamber Liner (Warm Air Furnace
Construction is Similar)
Figure 2: Wet Base Boiler with Unlined
Combustion Chamber