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30 | Installation
BOILER
Fig. 40 Exhaust located on side wall
• It is not recommended to terminate vent above any door or window,
condensate can freeze causing ice formations.
• Do not use chimney as a raceway if another boiler or fireplace is
vented into or through chimney.
• Because the unit is capable of discharging low temperature exhaust
gases, horizontal runs must slope upwards not less than ¼ in/ft
(21 mm/m) from the boiler to the vent terminal. Also, the horizontal
portions of the venting system shall be supported to prevent sagging
at intervals in accordance with and components used per vent
manufacturer's installation instructions.
• While there is a positive flue pressure during operation, the combined
pressure drop of vent and combustion air systems must not exceed
the following equivalent length:
PIPE SIZE - 6"
Model
MAX. equiv.
MAX. equiv.
(m)
800 SA
30
1000 SA
30
1000 TL
-
Fittings as well as pipe lengths must be calculated as part of the
equivalent length, according to the following table:
45° ELBOW - 6"
Model
equiv. (m)
equiv. (ft)
800 SA
1.5
1000 SA
1.5
1000 TL
-
6720866942 (2018/06) US
EXHAUST
PIPE SIZE - 10"
MAX. equiv.
MAX. equiv.
(ft)
(m)
(ft)
100
-
-
100
-
-
-
30
100
45° ELBOW - 10"
equiv. (m)
equiv. (ft)
5
-
-
5
-
-
-
1.5
5
BOILERS
90° ELBOW - 6"
Model
equiv. (m)
equiv. (ft)
800 SA
1.8
1000 SA
1.8
1000 TL
-
• These factors must be planned into the vent installation. If the maximum
allowable equivalent lengths of piping are exceeded, the unit will not
operate properly or reliably.
• For Massachusetts installations, contact companies able to provide vent
systems which conform to all applicable requirements for installations
within the Commonwealth of Massachusetts.
• For multiple boilers installation, common venting shall be done according to
examples on "Appendix E - Boiler Installation (example drawings)".
4 .8
Combustion air
Provisions for combustion and ventilation air in accordance with the
section "Air for Combustion and Ventilation," of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, or Clause 8.2, 8.3 or 8.4 of Natural
Gas and Propane Installation Code, CAN/CSA B149.1, or applicable
provisions of the local building codes. These codes should be consulted
before a permanent design is determined.
SSB boilers can take combustion air from the space in which are
installed, or the combustion air can be ducted directly to the unit.
Ventilation air must be provided in either case.
In cold climates it is recommended to provide a motorized air inlet
damper to control the supply of combustion air and prevent nuisance
condensation.
EXHAUST
90° ELBOW - 10"
equiv. (m)
equiv. (ft)
6
-
-
6
-
-
-
1.8
6
SSB
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