Table of Contents
Advertisement
Termination
The vent terminal must be vertical and must terminate
outside the building at least 2' (0.6 m) above the highest
point of the roof that is within 8' (2.4 m). The vent cap
must have a minimum clearance of 4' (1.2 m) horizontally
from and in no case above or below (unless a 4' [1.2 m]
horizontal distance is maintained) electric meters, gas
meters, regulators and relief equipment.
The distance of the vent terminal from adjacent buildings,
open windows and building openings must comply with
the NFGC (U.S.) or B149 (Canada). Gas vents supported
only by flashing and extended above the roof more than 5'
(1.5 m) should be securely guyed or braced to withstand
snow and wind loads.
CAUTION: A listed vent cap terminal suitable for
A
connection to the Cat IV vent materials in Table O and
Table R, adequately sized, must be used to evacuate the
flue products from the building.
A
WARNING: Vent connectors serving any other
appliances shall not be connected into any portion of
mechanical draft systems operating under a positive
pressure. If an XFiire heater is installed to replace an
existing heater, the vent system MUST be verified to be
of the correct size and of Category IV UL Listed stainless
steel vent material construction or other approved
vent materials noted in Table R. If it is NOT, it MUST be
replaced.
NOTE: For extractor sizing, typical CO2 levels are 8.6%
for natural gas and 10.0% for propane gas and flue
temperature of 150°F (65ºC), at 100% firing rate, 40ºF ∆T
and return temperature of 120ºF (49ºC) measured at the
test port, near the flue collar.
Model
Vent Size
Vent Pressure
No.
in. (mm)
300B
4
400B
(100 mm)
500B
650B
6
800B
(150 mm)
1000B
* NOTE: Data for 100% with range between min/max vent length.
Table T.
Typical Vent Pressure and Volume of
Flue Products - SS and Polypropylene
Volume of Flue
(in. WC)
Products (CFM)
0 to 0.2
90
0 to 0.2
120
0 to 0.2
150
0 to 0.2
195
0 to 0.2
240
0 to 0.2
300
Direct Vent-Vertical - Stainless Steel
and Polypropylene
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 Table S. 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 S.
The vent cap is not considered in the overall length of the
venting system. See Table R and Table R for appropriate
adapters.
CAUTION: This venting system may require the
A
installation of condensate drains in the vent piping per
the vent manufacturer's instructions. Failure to install
these condensate drains in the venting system may
cause a non-warrantable failure.
Care must be taken during assembly 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 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 at least 1/4" per foot of horizontal 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'
(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 at least 4" (100 mm) clearance from the side of one
vent cap to the side of the adjacent vent cap(s).
33
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
