Direct Vent - Horizontal - Raypak X94 Installation & Operating Instructions Manual

Direct Vent - Horizontal Through-
the-Wall
Installation
These installations utilize the heater-mounted blower
to draw combustion air from outdoors and vent com-
bustion products to the outdoors.
Fig. 9: Horizontal Through-the-Wall Direct Venting
The total length of the through-the-wall flue and air
intake cannot exceed 65' (19.81 m) equivalent ft each
(130' (39.62 m) combined) in length. 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 flue direct vent cap and air intake elbow are 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.
The vent must be installed to prevent the potential ac-
cumulation of condensate in the vent pipes. It is rec-
ommended that the vent be insulated. Insulation is
required for installations in cold environments (i.e.
below 40°F or 4°C).
For installations in extremely cold climate, it is re-
quired that:
1. The vent must be installed with a slight upward
slope of not more than 1/4" (6.35 mm) per foot of
horizontal run to the vent terminal. An approved
condensate trap must be installed per applicable
codes.
2. The intake vent must be insulated through the
length of the horizontal run.
Termination
The flue direct vent cap MUST be mounted on the ex-
terior 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.
The direct vent cap MUST NOT be installed with any
combustion air inlet directly above a direct vent cap.
This vertical spacing would allow the flue products
from the direct vent cap to be pulled into the combus-
tion 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. Multi-
ple direct vent caps should be installed in the same
horizontal plane with a 4' (1.22 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
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
CAUTION: Condensate is acidic and highly
corrosive.
The direct vent termination cap MUST be furnished by
the heater manufacturer in accordance with its listing
(sales order option D-11).
Use only the special gas vent pipes listed for use with
Category IV gas burning heaters, such as the AL29-4C
stainless steel vents offered by M&G DuraVent (800-
835-4429), Selkirk Inc. (1-800-992-VENT or 1-800-
992-8368 in the US, or 1-888-SEL-KIRK or 1-888-735-
5475 in Canada), Protech System, Inc. (800-766-
3473), Z-Flex (800-654-5600) or American Metal
Products (800-423-4270). Additionally, M&G DuraVent
PolyPro special gas vent and, where allowed, PVC
and CPVC Sch 40 pipe with appropriate listings may
be used. Pipe joints must be positively sealed. Follow
the vent manufacturer's installation instructions care-
fully.
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