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Common Venting Installation and
Operation Manual
RTGR/RTGS Models
Read and understand the instruction manual and
safety messages before installing, operating, or
servicing this product. Failure to follow these
instructions and safety messages could result in
death or serious injury. This manual must remain
For your family's comfort, safety, and convenience we recommend this
water heater be installed and serviced by a plumbing professional.
WARNING
with the water heater.
238-56173-00A REV 06/25
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Summary of Contents for Bradford White RTGR Series
- Page 1 Common Venting Installation and Operation Manual RTGR/RTGS Models WARNING Read and understand the instruction manual and safety messages before installing, operating, or servicing this product. Failure to follow these instructions and safety messages could result in death or serious injury. This manual must remain with the water heater.
- Page 2 Installing the Common Vent System CAUTION with PVC or CPVC venting materials Common Venting requires a Non-Return Valve on each water heater exhaust connector. Use only the NRV specified in this manual. NRV(Non-Return Valve) Each heater must be setup for Cascade Operating Mode. Refer to The NRV prevents backflow (back-draft) at the exhaust sections 4.9.2 Electrical and 4.9.3 Cascade Programming.
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Page 3: Maintenance
Maintenance 3. Reinstall the cap and cover, and then fix them with a set screw. Periodically check the damper condition inside the NRV through the maintenance port to ensure optimal performance of the system. Follow the instructions to check the damper condition and replace the NRV if necessary. - Page 4 4. Apply a moderate amount of primer/glue to the inside of Connecting the Pipe to the Common Vent the socket, fully coating the area the will over lap the pipe. 1. Cut the pipe to the measurement, and note the length where Use only approved primers and glues per the vent pipe the fitting will over lap.
- Page 5 Connecting the Pipe to the NRV Determining the Length of a Common Venting System 1. Measure 1.3"(33mm) from the end of the vent pipe, then draw an insertion mark at that point all the way around the pipe. Follow the instructions listed below to determine the length of a common vent.
- Page 6 Example of a Typical Installation The following illustration depicts an example of a common vent system installed for a cascade system of 8 water heaters. Intake Unit1 Unit2 Unit8 Unit1 Unit2 Unit8 (CA:01) (CA:02) (CA:08) (CA:01) (CA:02) (CA:08) Drain Drain Direct Vent Other than Direct Vent NOTE : The illustration is intended for reference purposes only.
- Page 7 PVC Common Venting Componets Configuration Connection to intake pipe Connection to exhaust pipe Fig. 20 Item Description 2"Non-Return Valve 2" PVC connector ° elbow 2"x90 2"xD" Tee D" Tee Condensate trap for Main trunk D" Connector End Cap...
- Page 8 Inline Polypropylene Common Venting Intake Fig. 23 Tee Cap Note: If Unit 1 vent length is shortened, all the corresponding vents need to be cut by the same amount + the required 1.1” Intake length to accommodate the 3° pitch. Support Clamp Branch 4.
- Page 9 Back-to-Back Polypropylene Common Venting Intake Support Clamp Tee Cap Horizontal Drain Fitting Siphon Intake Fig. 25 Branch 3” x 45° Elbow 6. Attach the condensate management components, horizontal drain fitting, and siphon, at the starting points of common vent manifolds. 2”...
- Page 10 Exhaust Unit # (See Cut From Bottom Male ISVL032* Length Below-Left) of Length (Inches) After Cut (Inches) 1 & 2 10.7 13.3 3 & 4 11.8 12.2 Connector Ring 5 & 6 12.9 11.1 3” Vent Length Unit # (See Cut From Bottom Male SVL032* Length Below-Left)
- Page 11 NOTES...
- Page 12 Technical Support 1-800-334-3393 techsupport@bradfordwhite.com Email Service Parts and Orders ca.orders@bradfordwhite.com For U.S. and Canada field service, contact your professional installer or local Bradford White sales representative. International General Contact international@bradfordwhite.com www.bradfordwhite.com ©2025, Bradford White Corporation, USA. All rights reserved.
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