Service manual

SC Series Boilers – Installation and Service Manual
8
Figure 1 – Condensate trap
The use of these manufacturers' venting systems for sidewall venting will require the vent terminal
supplied by Allied Engineering Company. The vent terminal for vertical venting and these venting
systems may be not supplied with this unit and should be obtained from the supplier of the venting
system listed above.
Condensate Trap
All boilers with vertical venting installations require a condensate drain
and drain trap. Do not operate the boiler without installing this trap and
filling with water.
The condensate drain should be installed as close to the boiler as
possible and must be equipped with a drain trap. The drain tap should
be formed by attaching 3/8” I.D. high temperature tubing, such as
silicone, to the drain assembly, making a loop of approximately 4”
diameter and securing it with a cord or tie wrap where the tube crosses
over itself. Do not squash the tube or over-tighten it, see Figure 1. The
loop must then be filled with water to form a liquid-filled trap. This trap
allows condensate to drain while preventing exhaust gases from
escaping.
Periodic inspection and cleaning should be made of this assembly. Check for deterioration of the tubing
and to ensure that the trap is filled with water. If the tube is plugged or appears to have excessive
sediment in it, it should be removed from the condensate drain pipe, straightened out to clear the
obstruction, reformed, filled with water and reinstalled as before. The drain should extend to a floor drain,
condensate pump or to a plastic container which may require emptying periodically. Condensate
disposal must be acceptable to the authority having jurisdiction.
Vent Terminal Information
The minimum distance from the termination of a vent terminal to adjacent public walkways, adjacent
buildings, openable windows and building openings shall be not less than those values specified in the
National Fuel Gas Code, ANSI Z223.1 and/or CAN/CSA Installation Codes.
Flue gas condensate can freeze on the exterior walls or on the vent cap. Frozen condensate on the vent
cap can result in a blocked flue condition. Some discoloration to exterior building surfaces can be
expected. Adjacent brick or masonry surfaces should be protected with a rust resistant sheet metal plate.
To prevent discoloration and degradation of building materials by flue gases and flue gas condensation,
ensure that the vent terminal is installed clear of nearby obstacles. In all cases, installation shall be in
accordance with code.
For proper operation, the vent terminal must be kept free of snow, leaf dropping and other debris at all
times to ensure that no blockage occurs. Do not terminate the vent in a window well, stairwell, alcove,
courtyard, or other recessed area. The vent cannot terminate below grade and directly above a paved
sidewalk or paved driveway that is located between two single-family dwellings and serves both
dwellings. The vent shall not terminate underneath a veranda, porch, or deck unless the veranda, porch,
or deck is fully open on a minimum of two sides beneath the floor and the distance between the top of the
vent termination and the underside of the veranda, porch, or deck is greater than 1 foot (300 mm).
Do not locate the vent terminal directly under roof or deck overhangs to prevent icicles from forming.
Vent terminal should not allow flue gas discharge towards neighbor’s windows or where personal injury or
property damage can occur.
It is highly recommended that the vent terminal be located where it will not be exposed to normal
prevailing winds.
The vertical termination shall extend at least 3 feet (0.9 m) above the highest point where it passes
through a roof of a building and at least 2 feet (0.6 m) higher than any portion of a building within a
horizontal distance of 10 feet (3.0 m), or specified as local jurisdiction.
The vent terminal shall be located at least 3 feet from any building opening and above any forced air inlet
located within 10 feet. And the vent terminal shall not be located within 6 feet (1.8 m) of a mechanical air
supply inlet to any building.