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The GX condensing gas boiler is a high effi ciency boiler
utilizing induced power venting. It is designed to be
vented directly to the outdoors using the venting methods
and materials detailed in this section. The vent system
must be both gas tight and watertight. All horizontal
vent piping must be sloped back to the boiler 1/4 in/ft,
21mm/m. of vent.
NOTE: Steps must be taken to ensure that condensate
does not collect in the venting system or the boiler
will not operate properly.
This boiler may be vented using the following materials,
but local codes must be followed:
• 3 in, 76 mm ABS solid core.
• 3 in, 76 mm PVC Sch.40 solid core pipe.
• 3 in, 76 mm CPVC Sch.40 pipe.
• 3 in, 76 mm AL29-4C fl ex Stainless vent
• 3 in, 76 mm AL29-4C Rigid Stainless Vent.
CAUTION: All vent systems must be fully supported
by the building structure. The vent connection and
vent piping MUST be perfectly aligned to the boiler
connection, Figure 3. It MUST NOT APPLY ANY
WEIGHT OR LATERAL FORCE TO THE FLUE BOX or
the fl ue box will be damaged voiding the warranty!
Appropriate adapters must be used to increase the
2 in, 51 mm vent collar to 3 in, 76 mm at the boiler,
Figure 3.
Figure 3- Vent Pipe To Boiler Attachment
The maximum combined equivalent vent and intake
pipe lengths are listed in Table 2. The length specifi ed
is the equivalent vent length added to the equivalent
intake length.
GT INSTALLATION AND OPERATION INSTRUCTIONS
Table 2 - Vent & Air Intake System Sizing
Model
Equivalent Combined Vent & Air Intake
Number
System Length (see note)
GT-150
GT-200
PGT-150
PGT-200
Note: Subtract 5 ft, 1.5 m, for each 90° elbow except for the vent and
air intake elbows. These don't need to be considered. The length of
the air inlet system must never exceed the length of the vent system.
The vent system length may exceed the air inlet system length by no
more than 20 equivalent ft, 6.1 equivalent m.
HORIZONTAL
DIRECT VENT SYSTEMS
Read the information in the GENERAL VENTING
GUIDELINES section. It is recommended that two
elbows be used, so that the 1/4 in/ft, 21mm/m slope of
the horizontal vent system does not affect the vertical
plumb of the pipe connected to the boiler, Figure 4.
Figure 4 - Vent System Attachment
When horizontal vent runs exceed 5 ft, 1.5m, they must
be supported at 3 ft, 0.9 m, intervals with overhead
hangers. The vent system must be pitched down,
toward the boiler, 1/4 in/ft, 21mm/m. of vent. Structural
penetrations must be made using approved thimbles.
Page 5
105 ft, 32 m
105 ft, 32 m
50 ft, 15 m
50 ft, 15 m
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