Use and Care Manual

19
110637-01 - 5/20
RRO Installation & Service Manual
d. Clean Chimney – Chimney shall be free of all
loose debris.
5. Draft Regulator – the draft regulator supplied with
the boiler (or equivalent) must be used with this
appliance. Refer to Figures 6-1 and 6-2.
CHIMNEY CONNECTOR
1. A chimney connector (vent pipe) is used to
connect the boiler to the base of the chimney.
The chimney connector should be kept as short
as possible. The horizontal length of the chimney
connector shall not be greater than 10 feet.
DANGER
The chimney and connector shall be inspected
annually for signs of debris and corrosion.
Loose mortar at the base of the chimney may be
a sign of condensate damage to the chimney.
A chimney professional shall be contacted
immediately to examine the damage and
recommend a solution. Long term operation
while in this condition may cause a venting
failure and force flue gases into the living
space. If the chimney is to be re-lined use the
recommendations in NFPA 31, Appendix E.
2. Vent Connector shall be any of the following
and of the same size as the outlet of boiler.
a. Type L or a factory built chimney material
that complies with the Type HT requirements
of ANSI/UL 103. Install in accordance with
listing and manufacturer’s instructions.
b. Steel pipe having resistance to corrosion
and heat with a minimum wall thickness of
24 Gauge (0.024”).
DANGER
Any sign of condensate seepage at the base
of the chimney shall be inspected immediately.
The discoloration may be a sign of chimney
damage and must be remedied immediately.
DRAFT
1. The natural draft generated through a chimney is
dependent on several factors including, chimney
height, temperature of flue gases, cross section
area of chimney, chimney wall insulation value,
dilution air and total volume of flue gases, to
name a few. Make sure that the boiler has been
running for at least 5 minutes before measuring
the draft.
6 Venting (continued)
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2. Minimum Draft Overfire – The draft induced by a
chimney must create at least a pressure of -0.02
inches water column (“ w.c.). The pressure at
the canopy cannot be positive since this could
create a condition that allows flue gas by-products
to escape from the draft regulator. A negative
pressure reading up to -.03 inches water column
is acceptable for proper operation.
STACK TEMPERATURE
1. The temperature of the flue gases has a significant
effect on the amount of draft created in a vertical
chimney as well as the propensity to create
condensate. The higher the stack temperature,
the greater the amount of draft that can be
generated. A lower stack temperature not only
reduces the amount of draft that can be created
but it also increases the possibility that the flue
gases could condense in the chimney connector
or stack.
2. NFPA 31 has information to help the installer make
an appropriate choice of venting materials. In
some cases a chimney may have to be lined to
create sufficient draft. In other cases, the chimney
may have to be lined to prevent the corrosion
of a masonry chimney. Consult with a chimney
specialist knowledgeable on the requirements
for chimney requirements in your area.
CAUTION
Any doubt on the condition of a chimney
or it’s ability to prevent the generation and
accumulation of flue gas condensate, must be
relined according to NFPA 31 (United States).
Use the chimney venting tables as a guide. It
is highly recommended that any borderline
application should result in the relining of
the chimney with a suitable liner that creates
sufficient draft and to protect against corrosion
caused by flue gas condensate.
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