Horizontal Through-The-Wall Venting (Category Iv) - Raypak X94 Installation & Operating Instructions Manual

Horizontal Through-the-Wall Venting
(Category IV)
Fig. 8: Horizontal Through-the-Wall Venting
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.
Installation
These installations utilize the heater-mounted blower
to vent the combustion products to the outdoors.
Combustion air is taken from inside the room and the
vent is installed horizontally through the wall to the out-
doors. Adequate combustion and ventilation air must
be supplied to the equipment room in accordance with
the NFGC (U.S.) or B149 (Canada).
The total length of the horizontal through-the-wall flue
system should not exceed 65 equivalent ft (19.81 m) in
length. If horizontal run exceeds 65 equivalent ft
(19.81 m), an appropriately sized variable-speed
extractor must be used. Each elbow used is equal to
10' (3.05 m) of straight pipe. This will allow installation
in one of the five following arrangements:
• 65' (19.81 m) of straight flue pipe
• 55' (16.76 m) of straight flue pipe and one elbow
• 45' (13.72 m) of straight flue pipe and two elbows
• 35' (10.67 m) of straight pipe and three elbows
• 25' (7.62 m) of straight pipe and four elbows
The vent cap is not considered in the overall length of
the venting system.
Model
Vent Size
No.
410 4"
10' (3.05 m)
* Subtract
Table 7: Max. Horizontal Vent Lengths
The vent must be installed to prevent flue gas leakage.
Care must be taken during assembly to ensure that all
joints are sealed properly and are airtight. The vent
must be installed to prevent the potential accumulation
of condensate in the vent pipes. It is recommended
that the vent be insulated. Insulation is required for
installations in cold environments (i.e. below 40°F or
4°C). 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 less than 1/4" (6.35 mm) per foot of
horizon-tal run to the vent terminal.
Termination
The direct vent cap MUST be mounted on the exterior
of the building. The direct vent cap cannot be installed
in a well or below grade. The direct vent cap must be
installed at least 1' (0.3 m) above ground level and
above normal snow levels. A Raypak-approved vent
cap must be used. The vent terminal must be located
NO CLOSER than 12" (0.3 m) off the wall.
WARNING: No substitutions of flue pipe or vent
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
22
Maximum Horizontal
Vent Length*
65' (19.81 m)
per elbow, maximum 4 elbows