American Water Heater Common Vent Kit for HCG3 Series User Manual

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Supports - You will need enough supports so that you can install one every 3 feet of horizontal run and every 5 
feet of vertical run for both the inlet and vent pipe. Supports may be field supplied metal strapping or equivalent.
 
Condensate Drain - Each water heater must have a separate condensate drain line running to an open drain. 
Follow the directions in the water heater’s Instruction Manual. Do not use a common condensate drain line for 
multiple heaters.
INSTRUCTIONS
Physical Layout - General
The requirements for the layout of the Polypropylene common vent system, required lengths and terminal locations 
are the same as for the PVC vent. The overall layout is shown in Figure 4. Consult the previous instructions for 
additional requirements.
INDIVIDUAL VENTCONNECTOR
OUTLET  VENT ADAPTER(KIT SUPPLIED PARTS)  (SEE TABLES 3A & 3B 
FOR RESPECTIVE MODELS AND KITS) 6Ø ELBOW UV RESISTANT + 
6Ø BIRD SCREEN(FIELD SUPPLIED PARTS)
6Ø BIRD SCREEN
(FIELD SUPPLIED PARTS)
6Ø PIPE
36 UV RESISTANT (FIELD SUPPLIED PARTS)
TERMINAL SECTIONS(UV RESISTANT)COMMON VENTING6 TEE W/CAP
(FIELD SUPPLIED PARTS)6Ø ELBOW
(FIELD SUPPLIED PARTS)INLET
VENT ADAPTER
(KIT SUPPLIED PARTS) (SEE TABLES 3A & 3B)ADAPTER
CONNECTOR
(KIT SUPPLIED  PARTS)
6Ø PIPE12”
(FIELD SUPPLIED PARTS)
FIGURE 4. DEFINITION OF SYSTEM SECTIONS - POLYPROPYLENE
NOTE: In both the air inlet and vent 
outlet  sides,  the  female  end  of  the 
pipe  or  fitting  is  always  towards  the 
terminations.
Servicing should only be performed by a 4ualified Service Technician  
						

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The general instructions for penetrating the side wall are found in the Side Wall Terminations sections of the 
water heater’s Instruction Manual. The common vent system may not be used with concentric or low  profile vent 
terminals. All pipe and terminations that are outside the structure should be UV pr\
otected (black) parts.
For each penetration, cut a 7” diameter hole through the structure. First, attach the final termination for the air 
intake to its final straight pipe. Outside the building, insert the male end of the last straight pipe section through 
the  wall  plate  and  then,  through  the  penetration.  This  last  section  should  be  the  UV  protected  pipe.  Run  a 
bead  of  field-supplied  silicone  sealant  around  the  wall  plate  and  press  it  in  place.  Inside  the  building,  place  a  
second wall  plate over the male end and seal the plate to the wall with silicone sealant. After the vent system is  
completely  set  up,  finish  the  penetration  by  sealing  the  gap  between  the  pipe  and  wall  plates  with  a  bead  of 
silicone sealant. Remove the rubber gasket at the end of the inlet and outlet and inse\
rt the bird screen into the 
groove that is now available.
VENT
The  vent  adapter  and  backflow  preventer  (See Figure  5) is connected to the aluminum heater outlet and  
condensate trap by inserting the male end of the vent outlet adapter into the outlet and securing it with the rubber 
boot and hose clamps (supplied with the water heater).
Straight pipe to tee - Use field-supplied straight vent sections to reach the horizontal part of the system that runs 
above the heaters. The total height from the bottom of the heater to the centerline of the horizontal must be from 
80” to 110”.
FIGURE 5. OUTLET VENT ADAPTER TO POLYPROPYLENE
150 - 250 MODELS300 - 500 MODELS
LOCKING RING
Servicing should only be performed by a 4ualified Service Technician   
						

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INLET AIR SIDE
Adapter to inlet - The male end of the air inlet adapter (See Figure 6) is inserted into the water heater air inlet (a 
PVC coupling). It is held in place with the connector adapter supplied in this kit. A 90° elbow is inserted into the 
female end adapter to turn the system in a vertical direction.
Straight pipe to tee - A straight pipe section is used to run from the elbow to the bottom of the tee. The length may 
be adjusted so that the height to the center line of the horizontal run is 80” to 110” from the base of the heater. A 
straight section is not required – you may insert the base of the tee\
 into the female end of the elbow.
Terminations
The placement of the vent and air terminals must follow the guidelines for terminal location found in the water  
heater’s Instruction Manual. All required clearances to building features are the same as found in the water heater’s  
Instruction Manual. The combustion vent terminal is a coupling with a screen that finishes the end of the pipe.  
The air inlet terminal must use the 90° elbow pointed down as shown in Figure 2. Clearances to the ground and 
to anticipated snow level must be as shown in Figure 2. The ends of both terminals must be protected with the 
bird screens supplied with the terminations.
FIGURE 6. AIR INLET ADAPTER 
Servicing should only be performed by a 4ualified Service Technician   
						

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NOTES
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NOTES
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							For additional information contact: 
1-800-527-1953
www.hotwater.com
       332199-001 
						

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