Midco RE32 - Manual (Page 3)

WARNING: BURNER CABINET MUST BE MOUNTED
IN ORIENTATION SHOWN IN FIGURES 2 AND 3.
ANY OTHER MOUNTINGS MAY CAUSE 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
retention plate and pilot assembly to make sure they are free
of foreign materials.
IV CHIMNEY, VENT CONNECTOR, AND
DRAFT CONTROL
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 Z21.8-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
connector, or 100% if the Vent Connector is insulated.
Maximum Input Flue Pipe Diameter
64 MBH 4"
100 MBH 5"
143 MBH 6"
195 MBH 7"
225 MBH 8"
300 MBH 9"
TABLE 1: Recommended Flue Pipe Sizes
Source: ANSI Z21.8A-1990, Installation of Domestic Gas
Conversion Burners. For Other Applications, Consult
Appropriate Standards.
■ 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 -3-
FIGURE 2 Dry Base Boiler With Combustion Chamber
Liner (Furnace Construction is Similar)
FIGURE 3 Wet Base Boiler with Unlined
Combustion Chamber
FIGURE 4 Draft Hood
FIGURE 5 Barometric Dampers
Figure 4 and 5 : Copyright by the American Gas
Association. Used by permission of the copyright holder.
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.
■ A draft hood or a barometric draft regulator shall be installed
in the same room or enclosure as the equipment in such a
manner as to prevent any difference in the pressure between
the hood or regulator and the combustion air supply. In no
case shall the relief opening of the draft hood or barometric
draft regulator be located at a point lower than the top of the
highest flue passage in the equipment.
■ Gas utilization equipment requiring controlled draft may be
equipped with a listed double acting barometric draft regulator
installed and adjusted in accordance with the manufacturerÕs
instructions if approved by local codes.
■ A device which will automatically shut off gas to the burner in
the event of sustained backdraft is required. It shall be of the
listed manual reset type and installed and adjusted by a
qualified service technician in accordance with the
manufacturerÕs instructions.