Tech Bulletin

1 TB-152
10/2018
Technical Bulletin 152-Updated O2 Settings for M-Series Boilers
Rinnai America Corporaon • 103 Internaonal Drive, Peachtree City, GA 30269
Toll-Free: 1-800-621-9419 • Phone: [phone] • www.rinnai.us
©2018 Rinnai America Corporaon. Rinnai America Corporaon connually updates materials, and as such, content is subject to change without noce. Local, state,
provincial, federal and naonal fuel gas codes must be adhered to prior to and upon installaon.
The purpose of this technical bullen is to communicate the proper O2 sengs of the M-Series boilers.
Maximum Input Minimum Input
Boiler
Model
Natural Gas Liquid Propane Natural Gas Liquid Propane
M060C (Combi) 4.7% - 4.9%
5.0% - 5.2%
0.4% - 1.6%
Higher Than
Observed on
Maximum
Input
4.7% - 5.5%
M090C (Combi)
4.2% - 4.4% M120C (Combi)
M160C (Combi)
M060S (Solo)
4.7% - 4.9%
M090S (Solo)
M120S (Solo)
4.2% - 4.4%
M160S (Solo)
• The O2 percentage seng is required to be checked at commissioning, maintenance, faults, and adjusted if needed.
• Correct gas supply pressure must be conrmed before tesng O2. Refer to the O2 tesng procedures in the
“Commissioning” secon of the “M-Series Condensing Boiler Installaon and Operaon Manual.”
• Boiler front cover must be in place for accurate ue gas tesng.
NOTICE
The O2 percentage is required to be checked and adjusted aer a conversion from Natural Gas to
Liquid Propane, or from Liquid Propane to Natural Gas. Seng the O2 at maximum input must be
performed with a calibrated combuson analyzer that is set to the correct gas type.
IMPORTANT: The informaon in this Technical Bullen is intended to be performed by the Installer/Technician.
A trained and qualied professional must install, inspect, and leak test the boiler before use. The warranty will be voided
due to any improper installaon. The boiler must be commissioned by a licensed professional. The trained and qualied
professional should have skills such as: gas sizing; connecng gas lines, water lines, valves, and electricity; knowledge of
applicable naonal, state, and local codes; installing venng through a wall or roof; and training in installaon of
condensing boilers. Training for Rinnai boilers is accessible online at www.trainingevents.rinnai.us.
WARNING
EXAMPLE: Model M060CN (N=Natural Gas)
Maximum input from the factory is observed to be 4.7% O2. This is within the tolerance and will not need to be
adjusted. The unit on minimum input is 5.8% and is within the 0.4% - 1.6% higher range.
EXAMPLE: Model M120SP (P=Propane)
The boiler has been eld converted to Liquid Propane. The maximum input O2 is observed to be 5.4%.
This will need to be lowered. Aer adjusng maximum input O2 to 5.1%, minimum output is observed to
be 5.2%. This is within the tolerance for minimum input.