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The Raypak approved horizontal, stainless steel flue
direct vent cap MUST be used. The vent terminal must be
located NO CLOSER than 12" (305 mm) off the wall.
WARNING: Mixing of different manufacturer's venting
A
material is not permitted and this may create an unsafe
condition.
3.19. Direct Vent - Vertical
36" MIN
FLUE EXHAUST
(914 mm)
VENT CAP
INTAKE VENT
12" MIN
(305 mm)
HEATER
F10025
*
HOUSEKEEPING PAD
CONDENSATE TRAP
* See Figure 6 on page 8.
Figure 39. Direct Vent–Vertical
3.19.1. Installation
CAUTION:
This
venting
A
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 may cause a
non-warrantable failure. Condensate is acidic and highly
corrosive. Condensate must not be allowed to freeze.
Take appropriate measures.
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 Table Q. Each elbow used is equal to
10' (3 m) of straight pipe. This will allow installation in any
arrangement that does not exceed the lengths shown
in Table Q. The vent cap is not considered in the overall
length of the venting system.
34
OR
36" MIN
(914 mm)
INSULATED
EXHAUST
VENTING
ALTERNATE
COMBUSTION
AIR INTAKE
LOCATION
TEST PORT
8.5" MIN
(215 mm)
12" MIN
(305 mm)
system
requires
the
Care must be taken during assembly that all joints are
sealed properly and are airtight.
The vent must be installed to prevent the potential ac-
cumulation 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.
2. The vent must be installed with a slight upward slope
of not more than 1/4 inch per foot of horizontal run to
the vent terminal.
3. The vent must be insulated through the length of the
run.
3.19.2. 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' (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" (100 mm) 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 cap
A
material are allowed. Such substitutions would jeopardize
the safety and health of inhabitants.
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