Wayne P250 series, User Manual

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The heating system (both the heat exchanger and distribution system) shall be of a size to properly heat the building. Throug h
inquiry it shall be determined that all rooms have been heated adequately without wide variations in temperature, without
objectionable drafts, and without excessive fuel costs in the past. If the heating system is deficient with respect to any of the above
determinations, provisions shall be made to correct the deficiency, replace obsolete parts, or (by installing storm windows,
insulation, etc.) to reduce the heat loss to a point where the existing system will provide the proper amount of heat.
a. Gravity Warm Air System
The supply and return ducts and registers should be sized and arranged so that the house can be heated without excessive
furnace temperatures. Reference may be made to the American Society of Heating, Refrigerating and Air-Conditioning
Engineers Guide and Data Book series and Handbook of Fundamentals.*
b. Forced Warm Air Systems
Inspection should also show whether the electrical characteristics of the fan and limit switch are satisfactory and whether the
air filters and fan are in condition for continued proper service with the gas burner. Reference may be made to the American
Society of Heating, Refrigerating and Air-Conditioning Engineers Guide and Data Book series and Handbook of
Fundamentals.*
c. Hot Water Systems
The boiler thermometer and altitude gauge should be in good order. On a closed system, the feed and pressure relief valves
shall be in proper operating condition. If there is an expansion tank on a closed system, inspection should show it to be
substantially empty of water. When there is an existing water temperature limiting switch, its operating and electrical
characteristics shall be checked to determine its suitability to the gas control circuit. For common piping systems reference can
be made to the American Society of Heating, Refrigerating and Air-Conditioning Engineers Guide and Data Book series* and
to the Hydronic Institute I=B=R Guides.**
d. Steam or Vapor System
The system shall be pressure tight, with pressure gauge and pop safety valve in good condition and with an existing water
glass which permits clear observation of boiler water level. When there is a pressure limit switch or low-water cut-off,
inspection shall determine whether either device can be utilized in the gas burner control circuit, reference should be made to
the American Society of Heating, Refrigerating and Air-Conditioning Engineers and Institute of Boiler and Radiator
Manufacturers guides. Traps and air vents shall be of adequate capacity, in good condition, and correctly placed in the
system.
*Copies may be obtained from the http://www.ashrae.org
**Copies may be obtained from the Hydronic Institute, 35 Russo Place, Berkeley, NJ 07922.
INSPECTION OF FLUE PIPE AND CHIMNEY

The flue pipe should be carefully inspected and replaced if necessary in connection with installation of a draft hood. A
barometric damper may be used per Flue Pipe, Draft Hood, and Barometric Damper section of manual. All installations must
operate with a negative draft overfire. Refer to your local gas company or codes for assistance or to the furnace and/or boiler
manufacturer for recommendations.

The flue pipe entrance into the chimney should be at least two feet (0.610m) above the clean-out opening in the chimney.

The chimney should extend high enough above the dwelling or other neighboring obstructions so that wind from any direction
will not strike the chimney from any angle above horizontal. Unless the obstruction is of greater magnitude, it is the usual
experience that a chimney extending two feet above flat roofs or above fire wall parapets, and peaked roofs within 30 feet
(9.144m) will be reasonably free of downdraft.

Where the chimney is unlined or where local experience indicates that flue gas condensate might be a problem, the local gas
company should be consulted.

The chimney should be examined and thoroughly cleaned, if necessary, before installation is made to make sure it will freely
conduct the flue gases to the outside.

Flue pipe should extend through the chimney wall to the inner face of the chimney liner but not beyond, and should be firmly
cemented to masonry. A thimble may be used to facilitate removal of flue pipe for cleaning, in which event the thimble should
be permanently cemented in place with mortar or other fireproof material that will not crack or check the flue pipe or thimble,
whichever is used, should be sealed into the chimney liner.

Flue connections from two or more appliances should not enter opposing or adjacent sides of the chimney at the same level.

Under no circumstances should the flue pipe be connected to a flue of an open fireplace.