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Installation and
Service Manual
21
Masonry Chimney Installation
A masonry chimney must be properly sized for the installation
of a high efficiency gas-fired appliance. Venting of a high
efficiency appliance into a cold or oversized masonry chimney
can result in operational and safety problems. Exterior
masonry chimneys, with one or more sides exposed to cold
outdoor temperatures, are more likely to have venting
problems. The temperature of the flue products from a high
efficiency appliance may not be able to sufficiently heat the
masonry structure of the chimney to generate proper draft. This
will result in condensing of flue products, damage to the
masonry flue/tile, insufficient draft and possible spillage of
flue products into an occupied living space. Carefully inspect
all chimney systems before installation.
Sidewall Vent Termination Clearances and
Location
Follow all sidewall venting termination information for
clearances and location under Sidewall Vent Termination
Clearances and Location, page 12.
Input Kit* Max. Vent Vent Max. Vent
Btu/hr (w/Power Length Termination Only Length
Fan Assy.)
(399,999 - 750,000 Btu/hr)
399,999 SVK3006 100 ft. SVK3043 50 ft.
500,000 SVK3006 100 ft. SVK3043 50 ft.
650,000 SVK3008 100 ft. SVK3044 50 ft.
750,000 SVK3008 100 ft. SVK3044 50 ft.
990,000 SVK3009 100 ft. N/A N/A
1,260,000 SVK3010 100 ft. N/A N/A
1,440,000 SVK3010 100 ft. N/A N/A
1,800,000 SVK3012 100 ft N/A N/A
2,070,000 SVK3012 100 ft. N/A N/A
*These kits include a sidewall venter assembly, vent termination, and barometric damper.
4. Horizontal DirectAire™ Venting
The Horizontal DirectAire™ vent system is the same as the
Sidewall Venting system, except it pulls combustion air from the
outdoors through a sidewall air inlet. Follow all requirements in
Sidewall Venting, page 19.
The Horizontal DirectAire™ vent system requires you to
install two vent pipes directly to the unit; one pipe for flue
products and one for combustion air. Install both vent pipes
horizontally with a sidewall termination point. For this venting
option, you must purchase the DV box accessory from the
appliance manufacturer. The DV box attaches to the air inlet of
the unit. The pipe for combustion air attaches to the DV box.
Make vent connection directly to the top of the unit. No
additional draft diverter or barometric damper is required on
single unit installations with a dedicated stack and a negative
draft maintained between 0.04 to 0.08 inches w.c.
The Horizontal DirectAire™ combustion air supply system
has specific vent material and installation requirements. The
air inlet pipe connects directly to the boiler to supply
combustion air. The combustion air inlet pipe is a dedicated
system with one air inlet pipe per boiler. You must connect the
air inlet pipe to a combustion air inlet cap as specified in this
section.
TABLE-E
Sidewall Vent Kits
IMPORTANT: Before installing a venting system,
follow all venting clearances and requirements
found in the Venting, General Information
section, page 11.
ƽ WARNING: Do not vent this unit into a
masonry chimney without a sealed stainless
steel liner system. Any breaks, leaks, or
damage to the masonry flue/tile will allow the
positive-pressure flue products to leak from
the chimney and into occupied living spaces.
This could cause serious injury or death due
to carbon monoxide poisoning and other
harmful flue products.
IMPORTANT: Check with local code officials
to determine code requirements or the
advisability of using a masonry chimney with
a sealed corrosion-resistant liner system.