Wayne HSG200, User Manual

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Strict compliance to appropriate codes should be made regarding flue pipe clearances from combustible
materials. A CSA type draft hood or its equivalent shall be placed in and made part of the flue pipe from
the appliance. A barometric damper may be used in place of the draft hood where permitted by local
building codes. If an oil barometric damper has been previously installed this may be used if it is in good
condition and any and all weights and/or stops are removed. The flapper on a gas barometric damper must
be free swinging in both directions. Check with local building codes and building inspectors. At no time
should the draft hood be located at a point lower than the highest flue passage in the appliance. The draft
hood should be installed in the position for which it was designed and in no case installed in a false ceiling,
separate room from the heating appliance, or in any other manner that will permit a difference in pressure
between the draft hood relief opening and the combustion air supply. On sealed type appliances where all
combustion air is taken from the outside, a cap should be installed on end of flue pipe to prevent back
drafts. In such cases no draft hood or diverter should be installed inside.
Pitch the horizontal run of the flue pipe upward 1/4 inch (6.35 mm) per foot (0.305 m) or more. Run directly
to the chimney, fasten joints securely and support horizontal runs to prevent snagging. If the flue pipe must
be extra-
long, it’s size should be increased. The horizontal length of the flue pipe should not exceed the
height of the chimney above the flue connection.
The draft control should be hood type per Figure 3 or, IF APPROVED BY LOCAL AUTHORITIES, a single
barometric damper suitable for gas firing per Figure 4. The draft control should be sized the same as the
flue pipe per Figure 5. Refer to the barometric draf
t regulator manufacturer’s instructions for complete
detail.
NOTICE: Should the flue pass through a partition the draft control must be located in the same room as
the heating appliance.
DRAFT HOOD & FLUE PIPE SIZES FOR GAS CONVERSION BURNERS IN FURNACES AND BOILERS
Input Btu/hr (kW) Drafthood Flue Pipe Size
Up to 120,000 Btu/hr (35 kW) 5 Inch (127 mm) Diameter
120,000 Btu/hr (35 kW)
– 180,000 Btu/hr (53 kW)
6 Inch (152 mm) Diameter
180,000 Btu/hr (53 kW)
– 250,000 Btu/hr (73 kW)
7 Inch (178 mm) Diameter
250,000 Btu/hr (73 kW)
– 320,000 Btu/hr (94 kW)
8 Inch (203 mm) Diameter
320,000 Btu/hr (94 kW)
– 410,000 Btu/hr (120 kW)
9 Inch (229 mm) Diameter
Figure 5

NOTE: If the flue pipe exceeds 10 ft. (3 m) in length, or contains more than two elbows, use next size larger
pipe and draft hood.

NOTE: All installations must operate with negative draft over fire. Refer to your local gas company and codes
for assistance.
When installing the burner in revertible flue (down draft or diving flue type) furnaces or boilers, the draft hood (or
draft diverter) should be located at least one foot higher than the top of the highest point of the appliance flue
passage or combustion chamber. It is also recommended that a vent pipe, not less than one inch in diameter, be
provided from the highest point in the flue passage, directly to the flue pipe. This is not necessary on the
appliances with built in up draft bypass. The gas company serving the area should be consulted in regards to their
recommendations for converting this type of furnace or boiler.
The flue pipe should be securely supported and the joints fastened with sheet metal screws or riveted to prevent
sagging, and in no case should be located in a manner that will present a hazard to combustible building material.
(Refer to local building code).