Horizontal Venting - RBI LCD Series Installation & Operation Manual

Page 10
VERTICAL/CHIMNEY VENTING
The LCD is listed as a Category I appliance when vented
vertically into a metal chimney system or properly sized
masonry chimney, Figures 1, 2, 6 & 7. The chimney must
provide a negative pressure of 0.01 to 0.08 in, .25
to 2.0 mm W.C. at the boiler/water heater fl ue collar
with the unit running at full load. A barometric damper
must be installed between the fl ue collar and the vent
connector. Approved thimbles and fi re-stops must be
used when combustible construction is penetrated.
WARNING : If an appliance using any type of a
mechanical draft system operating under
positive pressure is connected to a chimney
fl ue, never connect any other appliances to this
fl ue. Doing so can result in excessive levels of
carbon monoxide which can cause severe
personal injury or death!
Chimney Inspection & Sizing
A thorough inspection of the masonry chimney must be
performed to ensure that the chimney is clean, properly
constructed, lined and sized. Exterior masonry chimneys
should not be used unless properly lined to prevent
condensation and draft problems. Table 5 lists the
equivalent breeching and fl ue sizes required for the
boiler/water heater. When more than one appliance is
connected to the same chimney fl ue, the fl ue must be
large enough to safely vent the combined output of all
of the appliances.
Table 5 - Equivalent Breeching & Chimney Size
Model Size
225
300 - 400
600 - 750
1050
1200 - 1480
1650 - 2300
Note: These sizes are based on a 20 ft, 6.1m chimney height.
Vent Connections
Locate the boiler/water heater as close to the chimney
as possible. Use the shortest, straightest vent connector
possible for the installation. If horizontal runs exceed
5 ft, 1.5 m they must be supported at 3 ft, 0.9 m
intervals with overhead hangers. Use a type B, single
wall stainless or single wall galvanized steel vent pipe
the same diameter as the fl ue collar to connect the
boiler/water heater to a masonry chimney. When using
an approved metal chimney system use the appropriate
vent connector. The vent connector should be sloped up
toward the chimney at a minimum rate of 1/4 in/ft,
20 mm/m. On masonry chimneys the connector must
terminate fl ush with the inside of the chimney fl ue,
Figure 2. Fasten each single wall vent connection with
at least 3 corrosion resistant sheet metal screws.
LCD INSTALLATION AND OPERATION INSTRUCTIONS
Pipe Diameter
in mm
5 127
6 152
8 203
10 254
12 305
14 356
WARNING: Never install a vent pipe having a
diameter different than that of the boiler/water
heater fl ue collar. Failure to comply with this
warning can result in excessive levels of carbon
monoxide which can cause severe personal
injury or death.
Always provide a minimum clearance of 6 in, 152 mm
between single wall vent pipe and any combustible
materials. Type B1 vent may be used, clearance between
it and any combustible material must be as listed.
WARNING: Failure to maintain minimum
clearances between vent connectors and any
combustible material can result in a fi re causing
extensive property damage, severe personal
injury or death!
DIRECT VENT,
POSITIVE PRESSURE, CATEGORY III
In this confi guration the boiler/water heater blower is
used to push the fl ue products to the outdoors while
drawing combustion air from the outdoors. The equivalent
length of the vent and combustion air systems must not
exceed 35 ft, 10.7 m for each. The Intake Air Option
instr uctions under the "COMBUSTION AIR &
VENTILATION" section must be followed! The vent
system must be sized per Table 4.
Horizontal Direct Vent Systems - Figures 4 & 5
The vent materials used in horizontal vent systems
must be certifi ed to UL 1738 for installations in the
United States, ULC S636 for installations in Canada. The
certifi ed vent terminal from RBI must also be used.
The maximum equivalent length for the horizontal vent
and combustion air pipes is 35 ft, 10.8 m for each. Each
90˚ elbow and the intake air and vent terminals are
equal to 10 ft, 3.1 m of straight pipe. To maximize the
performance of single wall sheet metal vent systems
locate 90˚ elbows as far from the boiler as possible and
from one another. For best results, horizontal vent
systems should be as straight as possible.
The vent system must be both gas tight and watertight.
All seams and joints in metal pipes must be joined
and sealed in accordance with the vent system
manufacturer's instructions.
When horizontal vent runs exceed 5 ft, 1.5 m they
must be supported at 3 ft, 0.9 m intervals with overhead
hangers. The vent system must be pitched down, toward
the vent terminal, 1/4 in/ft, 20 mm/m. If any part of a
single wall metal vent system passes through an
unheated space it must be insulated with insulation
rated for 400˚F, 204˚C.