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Mascot ST Tankless Water Heater
through an outside wall.
Vent pipe must pitch upward, toward the vent
terminal, not less than 1/4" per foot, so that
condensate will run back to the Mascot ST to drain.
Route vent pipe to the heater as directly as possible.
Seal all joints and provide adequate hangers as
required in the venting system manufacturer's
Installation Instructions. Horizontal portions of
the venting system must be supported to prevent
sagging and may not have any low sections that
could trap condensate. The unit must not support the
weight of the vent pipe.
4.5 General Location Guideline
1. V ent system installation must be in accordance
with Local codes or, in the absence of local codes,
the National Fuel Gas Code, ANSI Z224.1 /NFPA
54 and/or CSA B149.1, Natural Gas and Propane
Installation Code.
2. T he Water Heater is designed to be installed as a
Direct Vent (sealed combustion) type.
T he air for combustion must be supplied directly
from the outside to the burner. Also, the flue gases
must be vented directly to the outdoors (through
wall or roof).
3. D o not install venting system components on the
exterior of building except as specifically required by
these instructions
- V ent terminals must be at least 1 foot from any door,
window, or gravity inlet into the building.
- M aintain the correct clearance and orientation
between the vent and air intake terminals.
T he vent and air intake terminals must be at the
same height and their center lines must be spaced
apart 12˝ minimum.
- T he bottom of the vent and air intake terminal must
be at least 12˝ above the normal snow line. In no
WARNING
F ailure to vent this Water Heater in accordance
with these instructions could cause a fire,
resulting in severe property damage, personal
injury or death.
D o not interchange vent systems or materials
unless it is specified.
T he use of thermal insulation covering pipe and
fittings is prohibited.
D o not apply an electric damper, draft hood or
vent damper with this Water Heater.
D o not locate vent termination where exposed
to prevailing winds. Moisture and ice may fall
on surface around vent termination. To prevent
deterioration, surface must be in good repair
(sealed, painted, etc.).
case should they be less than 12˝ above grade
level.
- D o not install the vent terminal directly over
windows or doors.
- A ir intake terminal must not terminate in areas that
might contain combustion air contaminates, such as
near swimming pools.
- F or sidewall venting, the minimum horizontal
distance between any adjacent individual Module
(Water Heater) vent terminations is twelve (12)
inches. It is better to be far more than 12 inches for
avoiding frost damage to building surfaces where
vent terminations are placed.
- T he minimum horizontal distance between any
adjacent individual module (water heater) roof vent
endpiece is one (1) foot.
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