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WARNING: No substitutions of flue pipe or vent
A
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
NOTE: While a drain connection is required in the vent
of all MVB installations, the drain can be accomplished
in several different ways. The figures in this manual
show the drain in a vent tee, however, this can also be
accomplished using an inline collector for condensing
stacks or an inline vertical or horizontal collector
available from several of the listed vent manufacturers.
Direct Vent—Vertical
Installation
These installations utilize the heater-mounted blower to
draw combustion air from outdoors and vent combustion
products to the outdoors.
The total length of air supply pipe cannot exceed the
distances listed in Tables L and M. Each elbow used
is equal to 10 ft (3 m) of straight pipe. This will allow
installation in any arrangement that does not exceed the
lengths shown in Table J and Table L.
The vent cap is not considered in the overall length of the
venting system.
Care must be taken during assembly that all joints are
sealed properly and are airtight.
INTAKE VENT
1' MIN
(305 mm)
FILTER
HEATER UNIT
F10685
Figure 31. Direct Vent - Vertical
The vent must be installed to prevent the potential
accumulation of condensate in the vent pipes. It is required
that:
1. The vent must be installed with a condensate drain
located in proximity to the heater as directed by the
vent manufacturer.
30
3' MIN
FLUE EXHAUST
(.91 m)
VENT CAP
3' MIN
(.91 m)
INSULATED
EXHAUST
VENTING
ALTERNATE
COMBUSTION
AIR INTAKE
TEST
LOCATION
PORT
CONDENSATION TRAP
2. The vent must be installed with a slight upward slope
of not more than 1/4 inch per foot of horizontal run
(21 mm per m) to the vent terminal.
3. The vent must be insulated through the length of the
horizontal run.
CAUTION: This venting system requires the installation
of a condensate drain in the vent piping per the vent
manufacturer's instructions. Failure to install a condensate
drain in the venting system will void all warranties on this
heater. The drain line must not be allowed to freeze. Take
appropriate measures.
Termination
The vent cap MUST be mounted on the exterior of the
building. The vent cap cannot be installed in a well or below
grade. The vent cap must be installed at least 1 ft (305
mm) above ground level and above normal snow levels.
The vent cap MUST NOT be installed with any combustion
air inlet directly above a vent cap. This vertical spacing
would allow the flue products from the vent cap to be
pulled into the combustion air intake installed above.
This type of installation can cause non-warrantable
problems with components and poor operation of the
heater due to the recirculation of flue products. Multiple
vent caps installed in the same horizontal plane must have
a 4 ft (1.2 m) clearance from the side of one vent cap to the
side of the adjacent vent cap(s).
Combustion air supplied from outdoors must be free of
particulate and chemical contaminants. To avoid a blocked
flue condition, keep the vent cap clear of snow, ice, leaves,
debris, etc.
WARNING: No substitutions of flue pipe or vent
A
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
The stainless steel flue direct vent cap must be furnished
by the heater manufacturer in accordance with its listing
(sales order option D-15).
Outdoor Installation
Outdoor models must be vented with listed Category IV
vent material per the following instructions and installed
with the factory-supplied outdoor vent kit. A special vent
cap and air intake hood are provided in accordance with
CSA requirements. These must be installed directly on the
vent pipe. See Figure 25.
CAUTION: Use of double-wall vent pipe is recommended
to minimize the risk of personal injury.
Care must be taken when locating the heater outdoors,
because the flue gases discharged from the vent cap
can condense as they leave the cap. Improper location
can result in damage to adjacent structures or building
finish. For maximum efficiency and safety, the following
precautions must be observed:
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