Venting And High-Altitude Adjustments - Rheem RTG-3 Series Use And Care Manual

Venting for Direct-Vent Water Heater
The water heater must be installed with 3-in�/5-in�
(7�6-cm/12�7-cm) diameter UL-approved Category III
Coaxial Stainless Steel appliance vent pipe or water
heater manufacturer-approved concentric vent pipe�
DANGER:
!
Failure to install and properly vent the water heater
to the outdoors as outlined in this Venting section
will result in death or serious personal injury. To
avoid the risk of fire, explosion, or asphyxiation
from carbon monoxide, NEVER operate the water
heater unless it is properly vented and has
adequate air supply for proper operation as outlined
in this Venting section.
WARNINGS:
!
• Use 3-in./5-in. (7.6-cm/12.7-cm) UL-approved
Category III Stainless Steel vent materials or
water heater manufacturer-approved vent
material. No other vent material is permitted for
use with this appliance.
• Refer to page 16 for required clearances to
combustible materials. Improper clearances
can cause explosion or fire resulting in death,
personal injury, and/or product damage.
Venting Requirements
The installation of venting must comply with national
codes, local codes, and the vent manufacturer's
instructions�
The water heater must be vented to the outdoors as
described in these instructions� DO NOT vent this water
heater through a chimney� It must be vented separately
from all other appliances�
This water heater requires a special venting system�
Refer to venting supplier's instruction for complete parts
list and method of installation� The manufacturers and
product lines listed on the following tables have been
tested and authorized to safely operate with Rheem
tankless water heater� Supplier of stainless steel venting
that are not listed on the following table is not permitted
for use Category III products with Rheem tankless water
heater�
WARNING:
!
DO NOT mix venting suppliers and models in
venting systems. Failure to comply could result in
personal injury, property damage, or death
Installations must comply with applicable national, state,
and local codes�
INSTALLATION INSTRUCTIONS
Allowable Stainless Steel Vent Supplier and Part Numbers
Example of Components
Pipe
90 Degree Elbow
45 Degree Elbow
Adjustable Vent Length
Vertical Cap Termination
Appliance Adapter
Condensate Drain
Horizontal Termination
*: xx refer to length of pipe
CAUTION:
!
DO NOT attempt to fabricate or adapt other vent
pipe or materials to this venting.
Use the provided screws to connect the coaxial vent pipe
together�
Follow the vent manufacturer's installation instructions�
This water heater can be vented horizontally or vertically�
All coaxial vent piping runs must be adequately
supported� The maximum recommended unsupported
span should be no more than 4 ft� (1�2 m)� Only use
support isolation hanging bands� DO NOT use wire to
support pipe runs�
Preexisting Venting Notes:
If the water heater is being installed as a
replacement for an existing water heater, a
thorough inspection of the existing venting and
air intake system must be performed prior to any
installation work. Verify that the correct materials,
vent lengths, and terminal locations as described
in this manual have been met. Carefully inspect
the entire venting and air intake system for any
signs of cracks or fractures, particularly at the
joints between elbows or other fittings and the
straight runs of vent pipe. Check the system for
signs of sagging or other stresses in the joints as
a result of misalignment of any components in the
system. If any of these conditions are found, they
must be corrected in accordance with the venting
instructions in this manual before completing
the installation and putting the water heater into
service.
See page 26 for additional requirements for the
Commonwealth of Massachusetts�
Metal Fab
*3CGVxx, 3CGxx
3CGV90L, 3CG90L
3CGV45L, 3CG45L
3GVL22, 3CGVVAL20
3CGVPVT, 3CGPVT
3CGVVPA, 3CGVPA
3CGVVDS, 3CGVDS
3CGVPHT, 3CGPHT,
3CGVPHT3, 3CGVPHT4
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