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SERIES 28RTS/HE BOILER INSTALLATION AND OPERATION INSTRUCTIONS
CHIMNEY & VENT PIPE
CONNECTIONS
WARNING: The vent installation must be in
accordance with the latest revision of Part 7,
Venting of Equipment, of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 for gas boilers
or ANSI/NFPA 31 Installation of Oil Burning
Equipment for oil boilers and the ASHRAE
Equipment Handbook on Venting. Canadian
installations must comply with CAN/CSA
B149.1 Natural Gas and Propane Installation
Code for gas boilers or CSA B140.7 Oil Burning
Equipment for oil boilers. All applicable local
building codes must be adhered to. Improper
venting of this boiler can result in excessive
levels of carbon monoxide which can result in
severe personal injury or death!
CAUTION: The products of combustion from a
RTS must be safely vented to the outdoors
while ensuring that the flue gasses do not cool
prematurely. It’s critical that the chimney system
be properly designed to handle the relatively cool
fl ue gas temperatures. An oversized or uninsulated
chimney will cause the moisture in the fl ue gases
to condense resulting in damage to the chimney
system unless it’s specifically designed for
condensate. If this is the case a suitable condensate
drain must be used to protect the boiler from
condensate.
NOTE: Our warranty does not cover corrosion
damage to the boiler or its vent system caused by
fl ue gas condensate!
Chimney Inspection & Sizing
If this boiler will be connected to a masonry chimney, a
thorough inspection of the chimney must be performed.
Ensure that the chimney is clean, properly constructed,
lined and properly sized, see Figure 2. Table 2 lists the
equivalent breeching and fl ue sizes required for the RTS
& RTS/HE boilers.
Table 2 - Equivalent Breeching & Chimney Size
Boiler Size
Breeching Size
Chimney Size
in
mm
in
mm
RTS-4
10
254
10
254
RTS-5
10
254
10
254
RTS-6
10
254
10
254
RTS-7
12
305
12
305
RTS-8
12
305
12
305
RTS-9
14
356
14
356
RTS-10
14
356
14
356
RTS-11
14
356
14
356
RTS-12
14
356
14
356
RTS-13
14
356
14
356
RTS-14
16
406
16
406
RTS-15
16
406
16
406
RTS-16
16
406
16
406
RTS-17
18
406
18
406
RTS-18
18
457
18
457
Note: These sizes are based on a 20 foot chimney height.
The 28RTS/HE Series is designed for pressurized
operation with a maximum back pressure of 0.10 in.,
2.54 mm WC before the smoke hood slide damper.
If the vent confi guration results in a maximum back
pressure greater than this, the burner capacity may
have to be reduced. Contact the Smith Technical Service
Department to verify the burner capacity.
The chimney must be able to provide 0.10 in. WC at
the boiler outlet. If the chimney is 50 ft. or taller it may
produce excessive draft (appox. - 0.25 in. WC) and a
barometric draft regulator may be needed.
When more than one piece of combustion equipment is
connected to the same chimney fl ue, the fl ue must be
large enough to safely vent the combined output of all
the equipment.
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 a Category I appliance to this
fl ue. Doing so can result in the accumulation
of carbon monoxide which can cause severe
personal injury or death!
