43
APPENDIX B2 – DIRECT VENTING
Planning a Direct Vent System
1.
Avoid contact with plumbing or electrical
wires.
2
. Horizontal vent pipe must maintain a
minimum ¼ inch per foot slope down
towards boiler.
3.
Any condensate forming in the vent will
return to the boiler. Provide for a condensate
trap or siphon near the boiler to remove
condensate from the vent.
4.
Support the piping to maintain vent location,
prevent sag and prevent accumulation of
condensate. The vent and/or air intake
piping must be adequately supported with
straps or supports with a maximum spacing
of five (5) feet on horizontal runs.
5.
Adhere to the boiler’s maximum and
minimum allowable vent lengths. Vent
length is provided in terms of
equivalent
length
of straight pipe plus equivalent length
of fittings, including both the vent and the
combustion air piping, but not including vent
or intake terminals.
6.
Maintain minimum allowable clearances
between the vent pipe and combustible
materials as specified by the vent pipe
supplier, this manual, and applicable building
codes.
7.
Do not install venting system components
on the exterior of the building except as
specifically required by these instructions.
8.
Locate the vent terminal per these
restrictions and Figure B-2:
(1) Minimum twelve (12) inches above
grade plus normally expected snow
accumulation level, or seven (7) feet
above grade, if located adjacent to
public walkway. Do not install over
public walkway where local experience
indicates appliance flue gas vapor
or condensate creates a nuisance or
hazard.
(2) Minimum three (3) feet above any
forced air intake located within ten (10)
feet.
Exception: Combustion air intake of
direct vent system.
(3) Minimum 4 ft. horizontally from, and in
no case above or below, unless a 4 ft.
horizontal distance is maintained, from
electric meters, gas meters, regulators
and relief equipment.
(4) Minimum twelve (12) inches from
overhangs or corners of buildings.
(5) If window and/or air inlet is within four
(4) feet of an inside corner, then vent
terminal must be at least six (6) feet
from adjoining wall of inside corner.
(6) Minimum one (1) foot below, one (1)
foot horizontally from, or one (1) foot
above any door, window, gravity air
inlet, or other air opening into building.
9.
Locate the combustion air terminal on
the same face of the building as the vent
termination to prevent nuisance boiler
shutdowns.
GeNeRAL WARNINGS foR DIReCt VeNt SYSteMS
DRAFT HOOD
S, VENT DAMPERS
and other
obstructions or openings in the vent system are
prohibited.
DO NOT REDUCE THE DIAMETER
of the vent
pipe.
MOISTURE AND ICE
may collect around and
below the vent terminal. Keep the area in good
repair.
IF USING A CHIMNEY AS A CHASE
for the vent,
do not vent any other appliance into the space
between the chimney wall and the vent.
ELIMINATE LOW SPOTS
in the vent where flue
gas condensate may pool.
DO NOT PENETRATE VENT PIPE
with holes or
fasteners.
Summary of Contents for ESC
Page 7: ...7 Figure S 1 Minimum Clearances to Combustibles SPECIFICATIONS continued...
Page 20: ...20 Figure 10 d Operating Instructions 10 Perform Startup Checks and Adjustments continued...
Page 37: ...37 Internal Wiring Figure IW 1 Wiring Diagram...
Page 38: ...38 Internal Wiring continued Figure IW 2 Wiring Diagram...