American Water Heater High Efficiency Commercial Gas HCG Series AHCG3 119T 300 THRU AHCG3 119T 500 Series 200 201 User Manual

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• Centrotherm InnoFlue vent system
AL29-4C Stainless Steel - See page 29
•  HeatFab Saf-T Vent
•  Duravent FasNSeal
NOTE:  The use of cellular core PVC (ASTM F891), cellular core 
CPVC,  or  Radel®  (polyphenolsulfone)  in  non-metallic  venting 
systems  is  prohibited.  Covering  non-metallic  vent  pipe  and 
fittings with thermal insulation is prohibited.
CATEGORY IV APPLIANCE
Category  IV  appliances  operate  with  a  positive  vent  (exhaust) 
static  pressure  and  with  vent  gas...

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Six Inch Pipe
The  water  heaters  covered  in  this  manual  are  certified  to 
a  maximum  length  of  6  inch  pipe  for  the  exhaust  venting 
arrangement  of  120  equivalent  feet  (36.5  m).  The  certified 
maximum  length  of  6  inch  pipe  for  intake  air  piping  is  also  120 
equivalent  feet  (36.5  m).  IE:  On  Direct  Vent  installations  both 
pipes can be up to 120 equivalent feet (36.5 m).
INTAKE AIR AND VENT PIPE CLEARANCES
The minimum clearance from combustible materials for...

23
9. All vent (exhaust) pipes must be pitched a minimum of a 1/4 
inch  per  foot  back  to  the  water  heater  (to  allow  drainage  of 
condensate).
10.  If  installing  4  inch  vent  pipe  connect  the  vent  pipe  to  the 
exhaust elbow on the water heater.
11.  If  installing  6  inch  pipe  transition  to  4  inch  pipe  as  shown  in 
Figure  15.  The  field  installed  4”  pipe  between  the  exhaust 
elbow and the 6” x 4” reducer coupling should be 18 inches 
(45 cm) or less in length.
DIRECT...

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14. If installing 4 inch intake air pipe connect the intake air pipe to 
the intake air connection on the water heater.
15.  If installing 6” intake air pipe transition to 4” pipe at the intake 
air  connection  on  the  water  heater  as  shown  in  Figure  18. 
The field installed 4” pipe between the intake air connection 
and the 6” x 4” reducer coupling should be 18 inches (45 cm) 
or less in length.
3” PIPE F ACTORY
INST ALLED
6” PIPE FIELD
SUPPLIED 4” PIPE FIELD
SUPPLIED
6” x 4” REDUCER
FIELD...

25
INTAKE  AIR AND/OR VENT
TERMINA TION(S) MUST  BE A 
MINIMUM OF 24 INCES (60 cm) 
ABOVE  ANY PARAPET, VERTICAL
WA LL OR STRUCTURE WITHIN
10 FEET  (3 m) HORIZONT ALLY.
VERTICAL  TERMINATION(S) FLA T ROOF CLEARANCEINTAKE  AIR AND/OR VENT  (EXHAUST)
24 INCHES (60 cm)
MINIMUM HEIGHT  ABOVE
IF LESS 
THAN
10 FEET  (3 m)
Figure 20
11.  Return to Power Vent Installation on page 23 or Direct Vent 
Installation  on  page  23  to  complete  the  installation  of  the 
intake air and/or vent piping between the...

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SIDEWALL TERMINATION INSTALLATION
1. Determine the location for the termination(s).
2.  If  installing  only  vent  (exhaust)  piping  in  a  Power  Vent 
configuration  through  a  sidewall;  ensure  that  all  exterior 
sidewall  clearance  requirements  for  the  termination,  shown 
in  Figure  45a  on  page  36,  are  being  maintained.  These 
clearances and those cited by local and national codes must 
be maintained.
3.  If  installing  both  intake  air  and  vent  piping  in  a  Direct  Vent...

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Installations  must  comply  with  applicable  national,  state,  and 
local codes. For Canadian installation, Polypropylene vent must 
be listed as a ULC-S636 approved system. If Polypropylene vent 
is  not  required  by  your  local  code,  you  may  use  either  PVC  or 
CPVC pipes for your water heater that allows non-metallic venting 
material installations.
Polypropylene vent systems do not use cement to connect the pipe 
and elbow sections but use a push together gasket seal method. 
Do not...

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AL29-4C® VENT INSTALLATIONS
(AL29-4C® is a registered trademark of Allegheny Technologies, Inc.)
The  water  heaters  covered  by  this  manual  are  approved  to  be  installed  with  AL29-4C®  stainless  steel  vent  material  using  parts 
from the manufacturers listed in Table 10 and Table 11 below. These listed systems must be installed using the vent manufacturer’s 
instructions  including  their  listed  clearances  to  combustible  and  noncombustible  materials.  Refer  to  Table  7-PVC/CPVC...

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termination  caps  for  all  concentric  terminations  must 
be  at  the  same  height  measured  from  ground.  See 
Multiple  Concentric  Termination  Arrangements  on 
page 31.
9.  Determine  if  the  concentric  termination  will  need  to  be 
shortened  to  accommadate  required  clearances  or 
to  ensure  all  vent  caps  are  at  the  same  height  when 
installing multiple terminations vertically through the roof 
in the same location.
See Figure 25 for the minimum lengths allowed for the 6...

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6 INCH CONCENTRIC TERMINATION INSTALLATION
6 INCH CONCENTRIC TERMINATION KITFIELD ASSEMBL Y REQUIRED
VENT PIPE
INT
AKE  AIR CONNECTION
VENT  CONNECTION - 4 INCH PVC
INTAKE  AIR PIPE
Y FITTING  ASSEMBLY
VENT  CAP
VENT  PIPE  ASSEMBL Y
VENT
 PIPE IS 4 INCH SDR-26 PIPE
SUPPLIED LENGTH 46.50” (1 18 cm)
MINIMUM  ALLOWABLE LENGTH 16.38” (41.6 cm)
INT AKE  AIR PIPE IS 6 INCH SDR-26 PIPE
SUPPLIED LENGTH 25.38” (64.5 cm )
MINIMUM  ALLOWABLE LENGTH 12” (30 cm )VENT
 CAP
INT
AKE  AIR PIPE
6” x 6” x 6”
Y FITTIN...