Reznor OH Unit Installation Manual - Manual (Page 11)

Form I-OH, PN 120390 R5, Page 11
WARNING: Failure to provide proper venting could result in
death, serious injury, and/or property damage. Unit must be
connected to flue having sufficient draft to ensure safe and
proper operation. Unit must be properly vented to the outside
of the building. Safe operation of any gravity-vented heating
equipment requires a properly operating vent system, correct
provision for combustion air, and regular maintenance and
inspection. See Hazard Levels, page 2.
6.2 Venting and
Combustion Air
6.1.6 Optional Solenoid Valve (Option DD1, shipped separately)
Use of the optional solenoid valve is recommended with the pressurized oil delivery
system (Paragraph 6.1.4). It is designed to operate simultaneously with the burner
motor.
6.1.7 Optional Oil Safety Valve (OSV) (Option DC1, shipped
separately)
The oil safety valve is opened by the slight vacuum created by the burner pump and
closes when the vacuum condition subsides. This prevents siphoning of the supply
line and eliminates spill, if any leaks develop downstream from the OSV. Use of the
optional oil safety valve is highly recommended.
6.1.8 Check Valve
The check valve prevents reverse flow of oil maintaining static head pressure between
the check valve and the automatic valve on the burner, thus preventing siphoning.
Check valves are field provided and are not needed when an oil safety valve (Option
DC1) is used.
6.2.1 Venting Masonry chimneys and metal chimneys must be built in accordance with accepted
building code practice. A Class A chimney or equivalent is required for this heater.
Standards for chimneys can be found in NFPA Standard No. 211, published in National
Fire Codes, Volume 4; the National Building Code of the American Insurance Associa-
tion, New York, NY; ULC Standards for chimneys; or the National Building Code of
Canada published by the National Research Council, Ottawa.
If an existing masonry or metal chimney is being used, prior to installing the heater,
clean and inspect the chimney. Make any necessary repairs and be sure that the chim-
ney meets all requirements.
If an approved factory-built chimney is being installed, be sure that it meets all require-
ments and install it according to the manufacturer's instructions. If a field-constructed
metal chimney is being installed, follow all of the requirements listed below.
• Use at least 8" (203mm) diameter vent pipe for Sizes 140/190 and at least 7"
(178mm) diameter for Size 95.
• Use either 24-gauge or heavier, galvanized steel or triple-wall stainless steel vent
pipe. (Triple-wall stainless steel vent pipe is recommended.)
• If the venting arrangement includes passing through a ceiling, triple-wall stainless
vent pipe is required above the ceiling. The point of passage through a ceiling
must be guarded by a metal ventilated thimble not less than 12" (305mm) larger in
diameter than the pipe.
• Install a tee with a cleanout cap at the bottom of the vertical rise.
The smallest dimension of the chimney must be at least 8" in diameter for Size 140
and 190 heaters and at least 7" in diameter for a Size 95 model. The chimney must
be at least three feet (.9M) above the highest point of exit where it passes through the
roof, and at least two feet (.6M) higher than any portion of a building within ten feet
(3M) of the chimney. Total chimney height must be a minimum of eight feet (2.4M). The
chimney must be capable of maintaining a steady draft of .04" w.c. If draft is below the
minimum required, a draft inducer must be installed.
For the vent connection from the flue outlet of the heater to the chimney, use vent pipe
of either 24-gauge or heavier galvanized steel or triple-wall stainless steel. For Sizes