Raypak 500 User Manual
Page 30
30
Direct Vent—Vertical
Installation
These installations utilize the heater-mounted blower
to draw combustion air from outdoors and vent com-
bustion products to the outdoors.
* Subtract 10 ft per elbow. Max. 4 elbows.
Table O: Category IV Horizontal Vent & Horizontal Direct Vent
The total length of air supply pipe cannot exceed the
distances listed in Table L. Each elbow used is equal
to 10 ft of straight pipe. This will allow installation in
any arrangement that does not exceed the lengths
shown in 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.
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 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 hori-
zontal run to the vent terminal.
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 above ground level and above normal snow levels.
The vent cap MUST NOT be installed with any com-
bustion 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.
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 boiler.
Fig. 24: Direct Vent - Vertical
Model No.
Certified Vent
Material
Vent and
Intake Air
Vent Size
(in.)
Horizontal Vent Height
(ft)
Combustion
Air Intake
Pipe
Material
Air Inlet
Max.
Length (ft)*
Min.
Max.
300
(Canada Only:
ULC-S636 PVC
and CPVC)
Stainless Steel,
AL29-4C,
ANSI/ASTM D1785
Sch 40 PVC,
ANSI/ASTM F441
Sch 40 CPVC
4
0
100
Galvanized
Steel,
PVC, ABS,
CPVC
100
500
850
6