Midco RS40 - Manual (Page 3)

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, an existing oil burner combustion
chamber liner can be used, if in good condition.
?? In the case of wet base boilers, where the
entire combustion chamber is comprised of heat
exchange surfaces and no combustion 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
combustion 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°F minimum insulating material.
?? The burner tube, must be sealed air tight
into the combustion chamber liner opening with
refractory material as shown by Figures 1 and 2.
CAUTION: In no case should the burner
tube be allowed to extend into the chamber
proper; it must be set flush with the inside
surface.
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-stan-
dard arrangements may be available for
some models; consult factory for details if
required.
?? Before permanently setting the burner in place, check that the burner nozzle is free of
foreign materials and also that the electrodes have not been damaged or displaced, see
Figure 7.
_____________________________________
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
ANSI Z21.8b latest edition and 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 chimney and a single
gas utilization equipment shall not exceed 75% of the height of the chimney above the con-
nector, 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
III Combustion Chamber
IV Chimney, Vent Connector,
and Draft Control
3
Part 1
Installation Continued
Figure 1: Dry Base Boiler with
Combustion Chamber Liner (Warm Air
Furnace Construction is Similar)
Figure 2: Wet Base Boiler with
Combustion Chamber Unlined
Maximum
Input
Vent Connector
Dia.
100 MBH
130 MBH
195 MBH
200 MBH
5"
6"
7"
8"
Table 1: Recommended Vent
Connector Sizes
Source: ANSI Z21.8b 1993, Installation
of Domestic Gas Conversion Burners.
For other applications,
consult appropriate standards.
Part 1 Installation