Rinnai M060C Installation And Operation Manual page 63

The boiler comes equipped with an automatic air purge process. This is a seven minute process
designed to eliminate air in the water. The air purge program will start whenever the water
pressure in the boiler gets below 10 PSI or when the boiler is powered on. The boiler will eliminate
air from the water through the air vent on the heat exchanger. A minimum of 19 PSI is needed to
complete the air purge process.
The boiler's internal air purge process is an effective method of purging air from the boiler after the
system has been filled or serviced.
Do not bypass the air purge process during commissioning or if the system pressure has dropped
below 10 PSI. If there is any chance that air has entered the system, air purging is critical to prevent
damage to the boiler.
WARNING
DO NOT bypass the air purge program during commissioning or if any part of the system has
been opened or disconnected. Failure to properly purge air from the boiler and system may
result in damage to the boiler, which is not covered by the boiler warranty.
To bypass the air purge process, press and hold the BACK button for approximately seven seconds.
This will put the boiler back into normal operation mode.
Rinnai M-Series Condensing Boiler Combi Manual 63