38
Horizontal Thru-wall Direct Venting
System with Add-on Condensing
Heat Exchanger (Category IV)
Installation
These installations utilize the boiler mounted blower to
draw combustion air from outdoors and vent combus-
tion products to the outdoors.
UL 1738 Certified Venting Material (e.g. AL29-4C)
MUST be used. The vent must be installed to prevent
the flue gas leakage. Care must be taken during
assembly to ensure that all joints are sealed properly
and are airtight.
For certain installations, i.e. pool, heat-pump, domes-
tic hot water supply with pre-heat tank, PVC or CPVC
may be used. Contact manufacturer for details.
To prevent condensate accumulation in the vent, it is
required to install the horizontal portion of vent with a
slight upward slope of not more than 1/4" per foot of
horizontal run and an approved condensate trap must
be installed per applicable codes.
The Stainless Steel non-restricted direct vent cap
must be furnished by the boiler manufacturer in
accordance with its listing.
WARNING:
For common vent installations, contact
the factory.
WARNING:
No substitutions of flue pipe or vent
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
Fig. 28: Vertical Direct Venting/Combustion Air with Add-on Condensing
Heat Exchanger (Category IV)
Summary of Contents for 751
Page 2: ...2...
Page 6: ...6 Component Locations Fig 1 Component Locations...
Page 15: ...15 Fig 6 Dual Boiler Piping Fig 7 Dual Boiler Piping with CHX...
Page 20: ...20 Fig 13 Single Boiler Pool Application Fig 14 Single Boiler Pool Application with CHX...
